# Docker安装redis

## Docker安装redis

1.首先下载redis镜像：

docker pull redis
2.然后创建一个文件夹用来存放redis的配置文件、数据等(也就是所谓的挂载目录,作用就是将此目录中的文件或文件夹覆盖掉容器内部的文件或文件夹)

3.在上面创建的目录下使用命令启动redis容器

docker run -d -p 6379:6379 -v $PWD/conf/redis.conf:/usr/local/etc/redis/redis.conf -v$PWD/data:/data --name docker-redis docker.io/redis redis-server /usr/local/etc/redis/redis.conf --appendonly yes

-d：表示后台运行，不加-d执行上面的命令你就会看到redis启动的日志信息了

-p：表示端口映射，冒号左面的是我们的宿主机的端口，也就是我们虚拟机的端口，而右侧则表示的是mysql容器内的端口

--name：是我们给redis容器取的名字

-v：表示挂载路径，$PWD表示当前目录下，冒号左面的表示我们宿主机的挂载目录，也就是我们虚拟机所在的文件路径，冒号右边则表是的是redis容器在容器内部的路径，上面的命令我分别挂载了redis.conf(redis的配置文件)，如需使用配置文件的方式启动redis，这里则需要加上，还有redis存放数据所在的目录 --appendonly yes：表示redis开启持久化策略 怎么样，是不是超级简单，哈哈哈，两步搞定~~~ redis.conf配置文件做如下配置主要是为了redis的可视化工具RedisDeskTopManager能够连接上我们用docker跑起来的redis服务 bind 0.0.0.0 protected-mode no daemonize no ## redis.conf完整配置文件  1 # Redis configuration file example. 2 # 3 # Note that in order to read the configuration file, Redis must be 4 # started with the file path as first argument: 5 # 6 # ./redis-server /path/to/redis.conf 7 8 # Note on units: when memory size is needed, it is possible to specify 9 # it in the usual form of 1k 5GB 4M and so forth: 10 # 11 # 1k => 1000 bytes 12 # 1kb => 1024 bytes 13 # 1m => 1000000 bytes 14 # 1mb => 1024*1024 bytes 15 # 1g => 1000000000 bytes 16 # 1gb => 1024*1024*1024 bytes 17 # 18 # units are case insensitive so 1GB 1Gb 1gB are all the same. 19 20 ################################## INCLUDES ################################### 21 22 # Include one or more other config files here. This is useful if you 23 # have a standard template that goes to all Redis servers but also need 24 # to customize a few per-server settings. Include files can include 25 # other files, so use this wisely. 26 # 27 # Notice option "include" won't be rewritten by command "CONFIG REWRITE" 28 # from admin or Redis Sentinel. Since Redis always uses the last processed 29 # line as value of a configuration directive, you'd better put includes 30 # at the beginning of this file to avoid overwriting config change at runtime. 31 # 32 # If instead you are interested in using includes to override configuration 33 # options, it is better to use include as the last line. 34 # 35 # include /path/to/local.conf 36 # include /path/to/other.conf 37 38 ################################## MODULES ##################################### 39 40 # Load modules at startup. If the server is not able to load modules 41 # it will abort. It is possible to use multiple loadmodule directives. 42 # 43 # loadmodule /path/to/my_module.so 44 # loadmodule /path/to/other_module.so 45 46 ################################## NETWORK ##################################### 47 48 # By default, if no "bind" configuration directive is specified, Redis listens 49 # for connections from all the network interfaces available on the server. 50 # It is possible to listen to just one or multiple selected interfaces using 51 # the "bind" configuration directive, followed by one or more IP addresses. 52 # 53 # Examples: 54 # 55 # bind 192.168.1.100 10.0.0.1 56 # bind 127.0.0.1 ::1 57 # 58 # ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the 59 # internet, binding to all the interfaces is dangerous and will expose the 60 # instance to everybody on the internet. So by default we uncomment the 61 # following bind directive, that will force Redis to listen only into 62 # the IPv4 loopback interface address (this means Redis will be able to 63 # accept connections only from clients running into the same computer it 64 # is running). 65 # 66 # IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES 67 # JUST COMMENT THE FOLLOWING LINE. 68 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 69 bind 0.0.0.0 70 71 # Protected mode is a layer of security protection, in order to avoid that 72 # Redis instances left open on the internet are accessed and exploited. 73 # 74 # When protected mode is on and if: 75 # 76 # 1) The server is not binding explicitly to a set of addresses using the 77 # "bind" directive. 78 # 2) No password is configured. 79 # 80 # The server only accepts connections from clients connecting from the 81 # IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain 82 # sockets. 83 # 84 # By default protected mode is enabled. You should disable it only if 85 # you are sure you want clients from other hosts to connect to Redis 86 # even if no authentication is configured, nor a specific set of interfaces 87 # are explicitly listed using the "bind" directive. 88 protected-mode no 89 90 # Accept connections on the specified port, default is 6379 (IANA #815344). 91 # If port 0 is specified Redis will not listen on a TCP socket. 92 port 6379 93 94 # TCP listen() backlog. 95 # 96 # In high requests-per-second environments you need an high backlog in order 97 # to avoid slow clients connections issues. Note that the Linux kernel 98 # will silently truncate it to the value of /proc/sys/net/core/somaxconn so 99 # make sure to raise both the value of somaxconn and tcp_max_syn_backlog 100 # in order to get the desired effect. 101 tcp-backlog 511 102 103 # Unix socket. 104 # 105 # Specify the path for the Unix socket that will be used to listen for 106 # incoming connections. There is no default, so Redis will not listen 107 # on a unix socket when not specified. 108 # 109 # unixsocket /tmp/redis.sock 110 # unixsocketperm 700 111 112 # Close the connection after a client is idle for N seconds (0 to disable) 113 timeout 0 114 115 # TCP keepalive. 116 # 117 # If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence 118 # of communication. This is useful for two reasons: 119 # 120 # 1) Detect dead peers. 121 # 2) Take the connection alive from the point of view of network 122 # equipment in the middle. 123 # 124 # On Linux, the specified value (in seconds) is the period used to send ACKs. 125 # Note that to close the connection the double of the time is needed. 126 # On other kernels the period depends on the kernel configuration. 127 # 128 # A reasonable value for this option is 300 seconds, which is the new 129 # Redis default starting with Redis 3.2.1. 130 tcp-keepalive 300 131 132 ################################# GENERAL ##################################### 133 134 # By default Redis does not run as a daemon. Use 'yes' if you need it. 135 # Note that Redis will write a pid file in /var/run/redis.pid when daemonized. 136 daemonize no 137 138 # If you run Redis from upstart or systemd, Redis can interact with your 139 # supervision tree. Options: 140 # supervised no - no supervision interaction 141 # supervised upstart - signal upstart by putting Redis into SIGSTOP mode 142 # supervised systemd - signal systemd by writing READY=1 to$NOTIFY_SOCKET
143 #   supervised auto    - detect upstart or systemd method based on
144 #                        UPSTART_JOB or NOTIFY_SOCKET environment variables
145 # Note: these supervision methods only signal "process is ready."
146 #       They do not enable continuous liveness pings back to your supervisor.
147 supervised no
148
149 # If a pid file is specified, Redis writes it where specified at startup
150 # and removes it at exit.
151 #
152 # When the server runs non daemonized, no pid file is created if none is
153 # specified in the configuration. When the server is daemonized, the pid file
154 # is used even if not specified, defaulting to "/var/run/redis.pid".
155 #
156 # Creating a pid file is best effort: if Redis is not able to create it
157 # nothing bad happens, the server will start and run normally.
158 pidfile /var/run/redis_6379.pid
159
160 # Specify the server verbosity level.
161 # This can be one of:
162 # debug (a lot of information, useful for development/testing)
163 # verbose (many rarely useful info, but not a mess like the debug level)
164 # notice (moderately verbose, what you want in production probably)
165 # warning (only very important / critical messages are logged)
166 loglevel notice
167
168 # Specify the log file name. Also the empty string can be used to force
169 # Redis to log on the standard output. Note that if you use standard
170 # output for logging but daemonize, logs will be sent to /dev/null
171 logfile ""
172
173 # To enable logging to the system logger, just set 'syslog-enabled' to yes,
174 # and optionally update the other syslog parameters to suit your needs.
175 # syslog-enabled no
176
177 # Specify the syslog identity.
178 # syslog-ident redis
179
180 # Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
181 # syslog-facility local0
182
183 # Set the number of databases. The default database is DB 0, you can select
184 # a different one on a per-connection basis using SELECT <dbid> where
185 # dbid is a number between 0 and 'databases'-1
186 databases 16
187
188 # By default Redis shows an ASCII art logo only when started to log to the
189 # standard output and if the standard output is a TTY. Basically this means
190 # that normally a logo is displayed only in interactive sessions.
191 #
192 # However it is possible to force the pre-4.0 behavior and always show a
193 # ASCII art logo in startup logs by setting the following option to yes.
194 always-show-logo yes
195
196 ################################ SNAPSHOTTING  ################################
197 #
198 # Save the DB on disk:
199 #
200 #   save <seconds> <changes>
201 #
202 #   Will save the DB if both the given number of seconds and the given
203 #   number of write operations against the DB occurred.
204 #
205 #   In the example below the behaviour will be to save:
206 #   after 900 sec (15 min) if at least 1 key changed
207 #   after 300 sec (5 min) if at least 10 keys changed
208 #   after 60 sec if at least 10000 keys changed
209 #
210 #   Note: you can disable saving completely by commenting out all "save" lines.
211 #
212 #   It is also possible to remove all the previously configured save
213 #   points by adding a save directive with a single empty string argument
214 #   like in the following example:
215 #
216 #   save ""
217
218 save 900 1
219 save 300 10
220 save 60 10000
221
222 # By default Redis will stop accepting writes if RDB snapshots are enabled
223 # (at least one save point) and the latest background save failed.
224 # This will make the user aware (in a hard way) that data is not persisting
225 # on disk properly, otherwise chances are that no one will notice and some
226 # disaster will happen.
227 #
228 # If the background saving process will start working again Redis will
229 # automatically allow writes again.
230 #
231 # However if you have setup your proper monitoring of the Redis server
232 # and persistence, you may want to disable this feature so that Redis will
233 # continue to work as usual even if there are problems with disk,
234 # permissions, and so forth.
235 stop-writes-on-bgsave-error yes
236
237 # Compress string objects using LZF when dump .rdb databases?
238 # For default that's set to 'yes' as it's almost always a win.
239 # If you want to save some CPU in the saving child set it to 'no' but
240 # the dataset will likely be bigger if you have compressible values or keys.
241 rdbcompression yes
242
243 # Since version 5 of RDB a CRC64 checksum is placed at the end of the file.
244 # This makes the format more resistant to corruption but there is a performance
245 # hit to pay (around 10%) when saving and loading RDB files, so you can disable it
246 # for maximum performances.
247 #
248 # RDB files created with checksum disabled have a checksum of zero that will
250 rdbchecksum yes
251
252 # The filename where to dump the DB
253 dbfilename dump.rdb
254
255 # The working directory.
256 #
257 # The DB will be written inside this directory, with the filename specified
258 # above using the 'dbfilename' configuration directive.
259 #
260 # The Append Only File will also be created inside this directory.
261 #
262 # Note that you must specify a directory here, not a file name.
263 dir ./
264
265 ################################# REPLICATION #################################
266
267 # Master-Replica replication. Use replicaof to make a Redis instance a copy of
268 # another Redis server. A few things to understand ASAP about Redis replication.
269 #
270 #   +------------------+      +---------------+
271 #   |      Master      | ---> |    Replica    |
272 #   | (receive writes) |      |  (exact copy) |
273 #   +------------------+      +---------------+
274 #
275 # 1) Redis replication is asynchronous, but you can configure a master to
276 #    stop accepting writes if it appears to be not connected with at least
277 #    a given number of replicas.
278 # 2) Redis replicas are able to perform a partial resynchronization with the
279 #    master if the replication link is lost for a relatively small amount of
280 #    time. You may want to configure the replication backlog size (see the next
281 #    sections of this file) with a sensible value depending on your needs.
282 # 3) Replication is automatic and does not need user intervention. After a
283 #    network partition replicas automatically try to reconnect to masters
284 #    and resynchronize with them.
285 #
286 # replicaof <masterip> <masterport>
287
288 # If the master is password protected (using the "requirepass" configuration
289 # directive below) it is possible to tell the replica to authenticate before
290 # starting the replication synchronization process, otherwise the master will
291 # refuse the replica request.
292 #
294
295 # When a replica loses its connection with the master, or when the replication
296 # is still in progress, the replica can act in two different ways:
297 #
298 # 1) if replica-serve-stale-data is set to 'yes' (the default) the replica will
299 #    still reply to client requests, possibly with out of date data, or the
300 #    data set may just be empty if this is the first synchronization.
301 #
302 # 2) if replica-serve-stale-data is set to 'no' the replica will reply with
303 #    an error "SYNC with master in progress" to all the kind of commands
304 #    but to INFO, replicaOF, AUTH, PING, SHUTDOWN, REPLCONF, ROLE, CONFIG,
305 #    SUBSCRIBE, UNSUBSCRIBE, PSUBSCRIBE, PUNSUBSCRIBE, PUBLISH, PUBSUB,
306 #    COMMAND, POST, HOST: and LATENCY.
307 #
308 replica-serve-stale-data yes
309
310 # You can configure a replica instance to accept writes or not. Writing against
311 # a replica instance may be useful to store some ephemeral data (because data
312 # written on a replica will be easily deleted after resync with the master) but
313 # may also cause problems if clients are writing to it because of a
314 # misconfiguration.
315 #
316 # Since Redis 2.6 by default replicas are read-only.
317 #
318 # Note: read only replicas are not designed to be exposed to untrusted clients
319 # on the internet. It's just a protection layer against misuse of the instance.
320 # Still a read only replica exports by default all the administrative commands
321 # such as CONFIG, DEBUG, and so forth. To a limited extent you can improve
322 # security of read only replicas using 'rename-command' to shadow all the
323 # administrative / dangerous commands.
325
326 # Replication SYNC strategy: disk or socket.
327 #
328 # -------------------------------------------------------
329 # WARNING: DISKLESS REPLICATION IS EXPERIMENTAL CURRENTLY
330 # -------------------------------------------------------
331 #
332 # New replicas and reconnecting replicas that are not able to continue the replication
333 # process just receiving differences, need to do what is called a "full
334 # synchronization". An RDB file is transmitted from the master to the replicas.
335 # The transmission can happen in two different ways:
336 #
337 # 1) Disk-backed: The Redis master creates a new process that writes the RDB
338 #                 file on disk. Later the file is transferred by the parent
339 #                 process to the replicas incrementally.
340 # 2) Diskless: The Redis master creates a new process that directly writes the
341 #              RDB file to replica sockets, without touching the disk at all.
342 #
343 # With disk-backed replication, while the RDB file is generated, more replicas
344 # can be queued and served with the RDB file as soon as the current child producing
345 # the RDB file finishes its work. With diskless replication instead once
346 # the transfer starts, new replicas arriving will be queued and a new transfer
347 # will start when the current one terminates.
348 #
349 # When diskless replication is used, the master waits a configurable amount of
350 # time (in seconds) before starting the transfer in the hope that multiple replicas
351 # will arrive and the transfer can be parallelized.
352 #
353 # With slow disks and fast (large bandwidth) networks, diskless replication
354 # works better.
355 repl-diskless-sync no
356
357 # When diskless replication is enabled, it is possible to configure the delay
358 # the server waits in order to spawn the child that transfers the RDB via socket
359 # to the replicas.
360 #
361 # This is important since once the transfer starts, it is not possible to serve
362 # new replicas arriving, that will be queued for the next RDB transfer, so the server
363 # waits a delay in order to let more replicas arrive.
364 #
365 # The delay is specified in seconds, and by default is 5 seconds. To disable
366 # it entirely just set it to 0 seconds and the transfer will start ASAP.
367 repl-diskless-sync-delay 5
368
369 # Replicas send PINGs to server in a predefined interval. It's possible to change
370 # this interval with the repl_ping_replica_period option. The default value is 10
371 # seconds.
372 #
373 # repl-ping-replica-period 10
374
375 # The following option sets the replication timeout for:
376 #
377 # 1) Bulk transfer I/O during SYNC, from the point of view of replica.
378 # 2) Master timeout from the point of view of replicas (data, pings).
379 # 3) Replica timeout from the point of view of masters (REPLCONF ACK pings).
380 #
381 # It is important to make sure that this value is greater than the value
382 # specified for repl-ping-replica-period otherwise a timeout will be detected
383 # every time there is low traffic between the master and the replica.
384 #
385 # repl-timeout 60
386
387 # Disable TCP_NODELAY on the replica socket after SYNC?
388 #
389 # If you select "yes" Redis will use a smaller number of TCP packets and
390 # less bandwidth to send data to replicas. But this can add a delay for
391 # the data to appear on the replica side, up to 40 milliseconds with
392 # Linux kernels using a default configuration.
393 #
394 # If you select "no" the delay for data to appear on the replica side will
395 # be reduced but more bandwidth will be used for replication.
396 #
397 # By default we optimize for low latency, but in very high traffic conditions
398 # or when the master and replicas are many hops away, turning this to "yes" may
399 # be a good idea.
400 repl-disable-tcp-nodelay no
401
402 # Set the replication backlog size. The backlog is a buffer that accumulates
403 # replica data when replicas are disconnected for some time, so that when a replica
404 # wants to reconnect again, often a full resync is not needed, but a partial
405 # resync is enough, just passing the portion of data the replica missed while
406 # disconnected.
407 #
408 # The bigger the replication backlog, the longer the time the replica can be
409 # disconnected and later be able to perform a partial resynchronization.
410 #
411 # The backlog is only allocated once there is at least a replica connected.
412 #
413 # repl-backlog-size 1mb
414
415 # After a master has no longer connected replicas for some time, the backlog
416 # will be freed. The following option configures the amount of seconds that
417 # need to elapse, starting from the time the last replica disconnected, for
418 # the backlog buffer to be freed.
419 #
420 # Note that replicas never free the backlog for timeout, since they may be
421 # promoted to masters later, and should be able to correctly "partially
422 # resynchronize" with the replicas: hence they should always accumulate backlog.
423 #
424 # A value of 0 means to never release the backlog.
425 #
426 # repl-backlog-ttl 3600
427
428 # The replica priority is an integer number published by Redis in the INFO output.
429 # It is used by Redis Sentinel in order to select a replica to promote into a
430 # master if the master is no longer working correctly.
431 #
432 # A replica with a low priority number is considered better for promotion, so
433 # for instance if there are three replicas with priority 10, 100, 25 Sentinel will
434 # pick the one with priority 10, that is the lowest.
435 #
436 # However a special priority of 0 marks the replica as not able to perform the
437 # role of master, so a replica with priority of 0 will never be selected by
438 # Redis Sentinel for promotion.
439 #
440 # By default the priority is 100.
441 replica-priority 100
442
443 # It is possible for a master to stop accepting writes if there are less than
444 # N replicas connected, having a lag less or equal than M seconds.
445 #
446 # The N replicas need to be in "online" state.
447 #
448 # The lag in seconds, that must be <= the specified value, is calculated from
449 # the last ping received from the replica, that is usually sent every second.
450 #
451 # This option does not GUARANTEE that N replicas will accept the write, but
452 # will limit the window of exposure for lost writes in case not enough replicas
453 # are available, to the specified number of seconds.
454 #
455 # For example to require at least 3 replicas with a lag <= 10 seconds use:
456 #
457 # min-replicas-to-write 3
458 # min-replicas-max-lag 10
459 #
460 # Setting one or the other to 0 disables the feature.
461 #
462 # By default min-replicas-to-write is set to 0 (feature disabled) and
463 # min-replicas-max-lag is set to 10.
464
465 # A Redis master is able to list the address and port of the attached
466 # replicas in different ways. For example the "INFO replication" section
467 # offers this information, which is used, among other tools, by
468 # Redis Sentinel in order to discover replica instances.
469 # Another place where this info is available is in the output of the
470 # "ROLE" command of a master.
471 #
472 # The listed IP and address normally reported by a replica is obtained
473 # in the following way:
474 #
475 #   IP: The address is auto detected by checking the peer address
476 #   of the socket used by the replica to connect with the master.
477 #
478 #   Port: The port is communicated by the replica during the replication
479 #   handshake, and is normally the port that the replica is using to
480 #   listen for connections.
481 #
482 # However when port forwarding or Network Address Translation (NAT) is
483 # used, the replica may be actually reachable via different IP and port
484 # pairs. The following two options can be used by a replica in order to
485 # report to its master a specific set of IP and port, so that both INFO
486 # and ROLE will report those values.
487 #
488 # There is no need to use both the options if you need to override just
489 # the port or the IP address.
490 #
491 # replica-announce-ip 5.5.5.5
492 # replica-announce-port 1234
493
494 ################################## SECURITY ###################################
495
496 # Require clients to issue AUTH <PASSWORD> before processing any other
497 # commands.  This might be useful in environments in which you do not trust
499 #
500 # This should stay commented out for backward compatibility and because most
501 # people do not need auth (e.g. they run their own servers).
502 #
503 # Warning: since Redis is pretty fast an outside user can try up to
504 # 150k passwords per second against a good box. This means that you should
505 # use a very strong password otherwise it will be very easy to break.
506 #
507 # requirepass foobared
508
509 # Command renaming.
510 #
511 # It is possible to change the name of dangerous commands in a shared
512 # environment. For instance the CONFIG command may be renamed into something
513 # hard to guess so that it will still be available for internal-use tools
514 # but not available for general clients.
515 #
516 # Example:
517 #
518 # rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
519 #
520 # It is also possible to completely kill a command by renaming it into
521 # an empty string:
522 #
523 # rename-command CONFIG ""
524 #
525 # Please note that changing the name of commands that are logged into the
526 # AOF file or transmitted to replicas may cause problems.
527
528 ################################### CLIENTS ####################################
529
530 # Set the max number of connected clients at the same time. By default
531 # this limit is set to 10000 clients, however if the Redis server is not
532 # able to configure the process file limit to allow for the specified limit
533 # the max number of allowed clients is set to the current file limit
534 # minus 32 (as Redis reserves a few file descriptors for internal uses).
535 #
536 # Once the limit is reached Redis will close all the new connections sending
537 # an error 'max number of clients reached'.
538 #
539 # maxclients 10000
540
541 ############################## MEMORY MANAGEMENT ################################
542
543 # Set a memory usage limit to the specified amount of bytes.
544 # When the memory limit is reached Redis will try to remove keys
545 # according to the eviction policy selected (see maxmemory-policy).
546 #
547 # If Redis can't remove keys according to the policy, or if the policy is
548 # set to 'noeviction', Redis will start to reply with errors to commands
549 # that would use more memory, like SET, LPUSH, and so on, and will continue
551 #
552 # This option is usually useful when using Redis as an LRU or LFU cache, or to
553 # set a hard memory limit for an instance (using the 'noeviction' policy).
554 #
555 # WARNING: If you have replicas attached to an instance with maxmemory on,
556 # the size of the output buffers needed to feed the replicas are subtracted
557 # from the used memory count, so that network problems / resyncs will
558 # not trigger a loop where keys are evicted, and in turn the output
559 # buffer of replicas is full with DELs of keys evicted triggering the deletion
560 # of more keys, and so forth until the database is completely emptied.
561 #
562 # In short... if you have replicas attached it is suggested that you set a lower
563 # limit for maxmemory so that there is some free RAM on the system for replica
564 # output buffers (but this is not needed if the policy is 'noeviction').
565 #
566 # maxmemory <bytes>
567
568 # MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
569 # is reached. You can select among five behaviors:
570 #
571 # volatile-lru -> Evict using approximated LRU among the keys with an expire set.
572 # allkeys-lru -> Evict any key using approximated LRU.
573 # volatile-lfu -> Evict using approximated LFU among the keys with an expire set.
574 # allkeys-lfu -> Evict any key using approximated LFU.
575 # volatile-random -> Remove a random key among the ones with an expire set.
576 # allkeys-random -> Remove a random key, any key.
577 # volatile-ttl -> Remove the key with the nearest expire time (minor TTL)
578 # noeviction -> Don't evict anything, just return an error on write operations.
579 #
580 # LRU means Least Recently Used
581 # LFU means Least Frequently Used
582 #
583 # Both LRU, LFU and volatile-ttl are implemented using approximated
584 # randomized algorithms.
585 #
586 # Note: with any of the above policies, Redis will return an error on write
587 #       operations, when there are no suitable keys for eviction.
588 #
589 #       At the date of writing these commands are: set setnx setex append
590 #       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
591 #       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
592 #       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
593 #       getset mset msetnx exec sort
594 #
595 # The default is:
596 #
597 # maxmemory-policy noeviction
598
599 # LRU, LFU and minimal TTL algorithms are not precise algorithms but approximated
600 # algorithms (in order to save memory), so you can tune it for speed or
601 # accuracy. For default Redis will check five keys and pick the one that was
602 # used less recently, you can change the sample size using the following
603 # configuration directive.
604 #
605 # The default of 5 produces good enough results. 10 Approximates very closely
606 # true LRU but costs more CPU. 3 is faster but not very accurate.
607 #
608 # maxmemory-samples 5
609
610 # Starting from Redis 5, by default a replica will ignore its maxmemory setting
611 # (unless it is promoted to master after a failover or manually). It means
612 # that the eviction of keys will be just handled by the master, sending the
613 # DEL commands to the replica as keys evict in the master side.
614 #
615 # This behavior ensures that masters and replicas stay consistent, and is usually
616 # what you want, however if your replica is writable, or you want the replica to have
617 # a different memory setting, and you are sure all the writes performed to the
618 # replica are idempotent, then you may change this default (but be sure to understand
619 # what you are doing).
620 #
621 # Note that since the replica by default does not evict, it may end using more
622 # memory than the one set via maxmemory (there are certain buffers that may
623 # be larger on the replica, or data structures may sometimes take more memory and so
624 # forth). So make sure you monitor your replicas and make sure they have enough
625 # memory to never hit a real out-of-memory condition before the master hits
626 # the configured maxmemory setting.
627 #
628 # replica-ignore-maxmemory yes
629
630 ############################# LAZY FREEING ####################################
631
632 # Redis has two primitives to delete keys. One is called DEL and is a blocking
633 # deletion of the object. It means that the server stops processing new commands
634 # in order to reclaim all the memory associated with an object in a synchronous
635 # way. If the key deleted is associated with a small object, the time needed
636 # in order to execute the DEL command is very small and comparable to most other
637 # O(1) or O(log_N) commands in Redis. However if the key is associated with an
638 # aggregated value containing millions of elements, the server can block for
639 # a long time (even seconds) in order to complete the operation.
640 #
641 # For the above reasons Redis also offers non blocking deletion primitives
642 # such as UNLINK (non blocking DEL) and the ASYNC option of FLUSHALL and
643 # FLUSHDB commands, in order to reclaim memory in background. Those commands
644 # are executed in constant time. Another thread will incrementally free the
645 # object in the background as fast as possible.
646 #
647 # DEL, UNLINK and ASYNC option of FLUSHALL and FLUSHDB are user-controlled.
648 # It's up to the design of the application to understand when it is a good
649 # idea to use one or the other. However the Redis server sometimes has to
650 # delete keys or flush the whole database as a side effect of other operations.
651 # Specifically Redis deletes objects independently of a user call in the
652 # following scenarios:
653 #
654 # 1) On eviction, because of the maxmemory and maxmemory policy configurations,
655 #    in order to make room for new data, without going over the specified
656 #    memory limit.
657 # 2) Because of expire: when a key with an associated time to live (see the
658 #    EXPIRE command) must be deleted from memory.
659 # 3) Because of a side effect of a command that stores data on a key that may
660 #    already exist. For example the RENAME command may delete the old key
661 #    content when it is replaced with another one. Similarly SUNIONSTORE
662 #    or SORT with STORE option may delete existing keys. The SET command
663 #    itself removes any old content of the specified key in order to replace
664 #    it with the specified string.
665 # 4) During replication, when a replica performs a full resynchronization with
666 #    its master, the content of the whole database is removed in order to
667 #    load the RDB file just transferred.
668 #
669 # In all the above cases the default is to delete objects in a blocking way,
670 # like if DEL was called. However you can configure each case specifically
671 # in order to instead release memory in a non-blocking way like if UNLINK
672 # was called, using the following configuration directives:
673
674 lazyfree-lazy-eviction no
675 lazyfree-lazy-expire no
676 lazyfree-lazy-server-del no
677 replica-lazy-flush no
678
679 ############################## APPEND ONLY MODE ###############################
680
681 # By default Redis asynchronously dumps the dataset on disk. This mode is
682 # good enough in many applications, but an issue with the Redis process or
683 # a power outage may result into a few minutes of writes lost (depending on
684 # the configured save points).
685 #
686 # The Append Only File is an alternative persistence mode that provides
687 # much better durability. For instance using the default data fsync policy
688 # (see later in the config file) Redis can lose just one second of writes in a
689 # dramatic event like a server power outage, or a single write if something
690 # wrong with the Redis process itself happens, but the operating system is
691 # still running correctly.
692 #
693 # AOF and RDB persistence can be enabled at the same time without problems.
694 # If the AOF is enabled on startup Redis will load the AOF, that is the file
695 # with the better durability guarantees.
696 #
698
699 appendonly no
700
701 # The name of the append only file (default: "appendonly.aof")
702
703 appendfilename "appendonly.aof"
704
705 # The fsync() call tells the Operating System to actually write data on disk
706 # instead of waiting for more data in the output buffer. Some OS will really flush
707 # data on disk, some other OS will just try to do it ASAP.
708 #
709 # Redis supports three different modes:
710 #
711 # no: don't fsync, just let the OS flush the data when it wants. Faster.
712 # always: fsync after every write to the append only log. Slow, Safest.
713 # everysec: fsync only one time every second. Compromise.
714 #
715 # The default is "everysec", as that's usually the right compromise between
716 # speed and data safety. It's up to you to understand if you can relax this to
717 # "no" that will let the operating system flush the output buffer when
718 # it wants, for better performances (but if you can live with the idea of
719 # some data loss consider the default persistence mode that's snapshotting),
720 # or on the contrary, use "always" that's very slow but a bit safer than
721 # everysec.
722 #
723 # More details please check the following article:
724 # http://antirez.com/post/redis-persistence-demystified.html
725 #
726 # If unsure, use "everysec".
727
728 # appendfsync always
729 appendfsync everysec
730 # appendfsync no
731
732 # When the AOF fsync policy is set to always or everysec, and a background
733 # saving process (a background save or AOF log background rewriting) is
734 # performing a lot of I/O against the disk, in some Linux configurations
735 # Redis may block too long on the fsync() call. Note that there is no fix for
736 # this currently, as even performing fsync in a different thread will block
737 # our synchronous write(2) call.
738 #
739 # In order to mitigate this problem it's possible to use the following option
740 # that will prevent fsync() from being called in the main process while a
741 # BGSAVE or BGREWRITEAOF is in progress.
742 #
743 # This means that while another child is saving, the durability of Redis is
744 # the same as "appendfsync none". In practical terms, this means that it is
745 # possible to lose up to 30 seconds of log in the worst scenario (with the
746 # default Linux settings).
747 #
748 # If you have latency problems turn this to "yes". Otherwise leave it as
749 # "no" that is the safest pick from the point of view of durability.
750
751 no-appendfsync-on-rewrite no
752
753 # Automatic rewrite of the append only file.
754 # Redis is able to automatically rewrite the log file implicitly calling
755 # BGREWRITEAOF when the AOF log size grows by the specified percentage.
756 #
757 # This is how it works: Redis remembers the size of the AOF file after the
758 # latest rewrite (if no rewrite has happened since the restart, the size of
759 # the AOF at startup is used).
760 #
761 # This base size is compared to the current size. If the current size is
762 # bigger than the specified percentage, the rewrite is triggered. Also
763 # you need to specify a minimal size for the AOF file to be rewritten, this
764 # is useful to avoid rewriting the AOF file even if the percentage increase
765 # is reached but it is still pretty small.
766 #
767 # Specify a percentage of zero in order to disable the automatic AOF
768 # rewrite feature.
769
770 auto-aof-rewrite-percentage 100
771 auto-aof-rewrite-min-size 64mb
772
773 # An AOF file may be found to be truncated at the end during the Redis
774 # startup process, when the AOF data gets loaded back into memory.
775 # This may happen when the system where Redis is running
776 # crashes, especially when an ext4 filesystem is mounted without the
777 # data=ordered option (however this can't happen when Redis itself
778 # crashes or aborts but the operating system still works correctly).
779 #
780 # Redis can either exit with an error when this happens, or load as much
781 # data as possible (the default now) and start if the AOF file is found
782 # to be truncated at the end. The following option controls this behavior.
783 #
784 # If aof-load-truncated is set to yes, a truncated AOF file is loaded and
785 # the Redis server starts emitting a log to inform the user of the event.
786 # Otherwise if the option is set to no, the server aborts with an error
787 # and refuses to start. When the option is set to no, the user requires
788 # to fix the AOF file using the "redis-check-aof" utility before to restart
789 # the server.
790 #
791 # Note that if the AOF file will be found to be corrupted in the middle
792 # the server will still exit with an error. This option only applies when
793 # Redis will try to read more data from the AOF file but not enough bytes
794 # will be found.
796
797 # When rewriting the AOF file, Redis is able to use an RDB preamble in the
798 # AOF file for faster rewrites and recoveries. When this option is turned
799 # on the rewritten AOF file is composed of two different stanzas:
800 #
801 #   [RDB file][AOF tail]
802 #
803 # When loading Redis recognizes that the AOF file starts with the "REDIS"
805 # tail.
806 aof-use-rdb-preamble yes
807
808 ################################ LUA SCRIPTING  ###############################
809
810 # Max execution time of a Lua script in milliseconds.
811 #
812 # If the maximum execution time is reached Redis will log that a script is
813 # still in execution after the maximum allowed time and will start to
814 # reply to queries with an error.
815 #
816 # When a long running script exceeds the maximum execution time only the
817 # SCRIPT KILL and SHUTDOWN NOSAVE commands are available. The first can be
818 # used to stop a script that did not yet called write commands. The second
819 # is the only way to shut down the server in the case a write command was
820 # already issued by the script but the user doesn't want to wait for the natural
821 # termination of the script.
822 #
823 # Set it to 0 or a negative value for unlimited execution without warnings.
824 lua-time-limit 5000
825
826 ################################ REDIS CLUSTER  ###############################
827 #
828 # ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
829 # WARNING EXPERIMENTAL: Redis Cluster is considered to be stable code, however
830 # in order to mark it as "mature" we need to wait for a non trivial percentage
831 # of users to deploy it in production.
832 # ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
833 #
834 # Normal Redis instances can't be part of a Redis Cluster; only nodes that are
835 # started as cluster nodes can. In order to start a Redis instance as a
836 # cluster node enable the cluster support uncommenting the following:
837 #
838 # cluster-enabled yes
839
840 # Every cluster node has a cluster configuration file. This file is not
841 # intended to be edited by hand. It is created and updated by Redis nodes.
842 # Every Redis Cluster node requires a different cluster configuration file.
843 # Make sure that instances running in the same system do not have
844 # overlapping cluster configuration file names.
845 #
846 # cluster-config-file nodes-6379.conf
847
848 # Cluster node timeout is the amount of milliseconds a node must be unreachable
849 # for it to be considered in failure state.
850 # Most other internal time limits are multiple of the node timeout.
851 #
852 # cluster-node-timeout 15000
853
854 # A replica of a failing master will avoid to start a failover if its data
855 # looks too old.
856 #
857 # There is no simple way for a replica to actually have an exact measure of
858 # its "data age", so the following two checks are performed:
859 #
860 # 1) If there are multiple replicas able to failover, they exchange messages
861 #    in order to try to give an advantage to the replica with the best
862 #    replication offset (more data from the master processed).
863 #    Replicas will try to get their rank by offset, and apply to the start
864 #    of the failover a delay proportional to their rank.
865 #
866 # 2) Every single replica computes the time of the last interaction with
867 #    its master. This can be the last ping or command received (if the master
868 #    is still in the "connected" state), or the time that elapsed since the
869 #    disconnection with the master (if the replication link is currently down).
870 #    If the last interaction is too old, the replica will not try to failover
871 #    at all.
872 #
873 # The point "2" can be tuned by user. Specifically a replica will not perform
874 # the failover if, since the last interaction with the master, the time
875 # elapsed is greater than:
876 #
877 #   (node-timeout * replica-validity-factor) + repl-ping-replica-period
878 #
879 # So for example if node-timeout is 30 seconds, and the replica-validity-factor
880 # is 10, and assuming a default repl-ping-replica-period of 10 seconds, the
881 # replica will not try to failover if it was not able to talk with the master
882 # for longer than 310 seconds.
883 #
884 # A large replica-validity-factor may allow replicas with too old data to failover
885 # a master, while a too small value may prevent the cluster from being able to
886 # elect a replica at all.
887 #
888 # For maximum availability, it is possible to set the replica-validity-factor
889 # to a value of 0, which means, that replicas will always try to failover the
890 # master regardless of the last time they interacted with the master.
891 # (However they'll always try to apply a delay proportional to their
892 # offset rank).
893 #
894 # Zero is the only value able to guarantee that when all the partitions heal
895 # the cluster will always be able to continue.
896 #
897 # cluster-replica-validity-factor 10
898
899 # Cluster replicas are able to migrate to orphaned masters, that are masters
900 # that are left without working replicas. This improves the cluster ability
901 # to resist to failures as otherwise an orphaned master can't be failed over
902 # in case of failure if it has no working replicas.
903 #
904 # Replicas migrate to orphaned masters only if there are still at least a
905 # given number of other working replicas for their old master. This number
906 # is the "migration barrier". A migration barrier of 1 means that a replica
907 # will migrate only if there is at least 1 other working replica for its master
908 # and so forth. It usually reflects the number of replicas you want for every
909 # master in your cluster.
910 #
911 # Default is 1 (replicas migrate only if their masters remain with at least
912 # one replica). To disable migration just set it to a very large value.
913 # A value of 0 can be set but is useful only for debugging and dangerous
914 # in production.
915 #
916 # cluster-migration-barrier 1
917
918 # By default Redis Cluster nodes stop accepting queries if they detect there
919 # is at least an hash slot uncovered (no available node is serving it).
920 # This way if the cluster is partially down (for example a range of hash slots
921 # are no longer covered) all the cluster becomes, eventually, unavailable.
922 # It automatically returns available as soon as all the slots are covered again.
923 #
924 # However sometimes you want the subset of the cluster which is working,
925 # to continue to accept queries for the part of the key space that is still
926 # covered. In order to do so, just set the cluster-require-full-coverage
927 # option to no.
928 #
929 # cluster-require-full-coverage yes
930
931 # This option, when set to yes, prevents replicas from trying to failover its
932 # master during master failures. However the master can still perform a
933 # manual failover, if forced to do so.
934 #
935 # This is useful in different scenarios, especially in the case of multiple
936 # data center operations, where we want one side to never be promoted if not
937 # in the case of a total DC failure.
938 #
939 # cluster-replica-no-failover no
940
941 # In order to setup your cluster make sure to read the documentation
942 # available at http://redis.io web site.
943
944 ########################## CLUSTER DOCKER/NAT support  ########################
945
946 # In certain deployments, Redis Cluster nodes address discovery fails, because
947 # addresses are NAT-ted or because ports are forwarded (the typical case is
948 # Docker and other containers).
949 #
950 # In order to make Redis Cluster working in such environments, a static
951 # configuration where each node knows its public address is needed. The
952 # following two options are used for this scope, and are:
953 #
954 # * cluster-announce-ip
955 # * cluster-announce-port
956 # * cluster-announce-bus-port
957 #
958 # Each instruct the node about its address, client port, and cluster message
959 # bus port. The information is then published in the header of the bus packets
960 # so that other nodes will be able to correctly map the address of the node
961 # publishing the information.
962 #
963 # If the above options are not used, the normal Redis Cluster auto-detection
964 # will be used instead.
965 #
966 # Note that when remapped, the bus port may not be at the fixed offset of
967 # clients port + 10000, so you can specify any port and bus-port depending
968 # on how they get remapped. If the bus-port is not set, a fixed offset of
969 # 10000 will be used as usually.
970 #
971 # Example:
972 #
973 # cluster-announce-ip 10.1.1.5
974 # cluster-announce-port 6379
975 # cluster-announce-bus-port 6380
976
977 ################################## SLOW LOG ###################################
978
979 # The Redis Slow Log is a system to log queries that exceeded a specified
980 # execution time. The execution time does not include the I/O operations
981 # like talking with the client, sending the reply and so forth,
982 # but just the time needed to actually execute the command (this is the only
983 # stage of command execution where the thread is blocked and can not serve
984 # other requests in the meantime).
985 #
986 # You can configure the slow log with two parameters: one tells Redis
987 # what is the execution time, in microseconds, to exceed in order for the
988 # command to get logged, and the other parameter is the length of the
989 # slow log. When a new command is logged the oldest one is removed from the
990 # queue of logged commands.
991
992 # The following time is expressed in microseconds, so 1000000 is equivalent
993 # to one second. Note that a negative number disables the slow log, while
994 # a value of zero forces the logging of every command.
995 slowlog-log-slower-than 10000
996
997 # There is no limit to this length. Just be aware that it will consume memory.
998 # You can reclaim memory used by the slow log with SLOWLOG RESET.
999 slowlog-max-len 128
1000
1001 ################################ LATENCY MONITOR ##############################
1002
1003 # The Redis latency monitoring subsystem samples different operations
1004 # at runtime in order to collect data related to possible sources of
1005 # latency of a Redis instance.
1006 #
1007 # Via the LATENCY command this information is available to the user that can
1008 # print graphs and obtain reports.
1009 #
1010 # The system only logs operations that were performed in a time equal or
1011 # greater than the amount of milliseconds specified via the
1012 # latency-monitor-threshold configuration directive. When its value is set
1013 # to zero, the latency monitor is turned off.
1014 #
1015 # By default latency monitoring is disabled since it is mostly not needed
1016 # if you don't have latency issues, and collecting data has a performance
1017 # impact, that while very small, can be measured under big load. Latency
1018 # monitoring can easily be enabled at runtime using the command
1019 # "CONFIG SET latency-monitor-threshold <milliseconds>" if needed.
1020 latency-monitor-threshold 0
1021
1023
1024 # Redis can notify Pub/Sub clients about events happening in the key space.
1025 # This feature is documented at http://redis.io/topics/notifications
1026 #
1027 # For instance if keyspace events notification is enabled, and a client
1028 # performs a DEL operation on key "foo" stored in the Database 0, two
1029 # messages will be published via Pub/Sub:
1030 #
1031 # PUBLISH __keyspace@0__:foo del
1032 # PUBLISH __keyevent@0__:del foo
1033 #
1034 # It is possible to select the events that Redis will notify among a set
1035 # of classes. Every class is identified by a single character:
1036 #
1037 #  K     Keyspace events, published with __keyspace@<db>__ prefix.
1038 #  E     Keyevent events, published with __keyevent@<db>__ prefix.
1039 #  g     Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
1040 #  $String commands 1041 # l List commands 1042 # s Set commands 1043 # h Hash commands 1044 # z Sorted set commands 1045 # x Expired events (events generated every time a key expires) 1046 # e Evicted events (events generated when a key is evicted for maxmemory) 1047 # A Alias for g$lshzxe, so that the "AKE" string means all the events.
1048 #
1049 #  The "notify-keyspace-events" takes as argument a string that is composed
1050 #  of zero or multiple characters. The empty string means that notifications
1051 #  are disabled.
1052 #
1053 #  Example: to enable list and generic events, from the point of view of the
1054 #           event name, use:
1055 #
1056 #  notify-keyspace-events Elg
1057 #
1058 #  Example 2: to get the stream of the expired keys subscribing to channel
1059 #             name __keyevent@0__:expired use:
1060 #
1061 #  notify-keyspace-events Ex
1062 #
1063 #  By default all notifications are disabled because most users don't need
1064 #  this feature and the feature has some overhead. Note that if you don't
1065 #  specify at least one of K or E, no events will be delivered.
1066 notify-keyspace-events ""
1067
1069
1070 # Hashes are encoded using a memory efficient data structure when they have a
1071 # small number of entries, and the biggest entry does not exceed a given
1072 # threshold. These thresholds can be configured using the following directives.
1073 hash-max-ziplist-entries 512
1074 hash-max-ziplist-value 64
1075
1076 # Lists are also encoded in a special way to save a lot of space.
1077 # The number of entries allowed per internal list node can be specified
1078 # as a fixed maximum size or a maximum number of elements.
1079 # For a fixed maximum size, use -5 through -1, meaning:
1080 # -5: max size: 64 Kb  <-- not recommended for normal workloads
1081 # -4: max size: 32 Kb  <-- not recommended
1082 # -3: max size: 16 Kb  <-- probably not recommended
1083 # -2: max size: 8 Kb   <-- good
1084 # -1: max size: 4 Kb   <-- good
1085 # Positive numbers mean store up to _exactly_ that number of elements
1086 # per list node.
1087 # The highest performing option is usually -2 (8 Kb size) or -1 (4 Kb size),
1088 # but if your use case is unique, adjust the settings as necessary.
1089 list-max-ziplist-size -2
1090
1091 # Lists may also be compressed.
1092 # Compress depth is the number of quicklist ziplist nodes from *each* side of
1093 # the list to *exclude* from compression.  The head and tail of the list
1094 # are always uncompressed for fast push/pop operations.  Settings are:
1095 # 0: disable all list compression
1096 # 1: depth 1 means "don't start compressing until after 1 node into the list,
1097 #    going from either the head or tail"
1099 #    [head], [tail] will always be uncompressed; inner nodes will compress.
1101 #    2 here means: don't compress head or head->next or tail->prev or tail,
1102 #    but compress all nodes between them.
1104 # etc.
1105 list-compress-depth 0
1106
1107 # Sets have a special encoding in just one case: when a set is composed
1108 # of just strings that happen to be integers in radix 10 in the range
1109 # of 64 bit signed integers.
1110 # The following configuration setting sets the limit in the size of the
1111 # set in order to use this special memory saving encoding.
1112 set-max-intset-entries 512
1113
1114 # Similarly to hashes and lists, sorted sets are also specially encoded in
1115 # order to save a lot of space. This encoding is only used when the length and
1116 # elements of a sorted set are below the following limits:
1117 zset-max-ziplist-entries 128
1118 zset-max-ziplist-value 64
1119
1120 # HyperLogLog sparse representation bytes limit. The limit includes the
1121 # 16 bytes header. When an HyperLogLog using the sparse representation crosses
1122 # this limit, it is converted into the dense representation.
1123 #
1124 # A value greater than 16000 is totally useless, since at that point the
1125 # dense representation is more memory efficient.
1126 #
1127 # The suggested value is ~ 3000 in order to have the benefits of
1128 # the space efficient encoding without slowing down too much PFADD,
1129 # which is O(N) with the sparse encoding. The value can be raised to
1130 # ~ 10000 when CPU is not a concern, but space is, and the data set is
1131 # composed of many HyperLogLogs with cardinality in the 0 - 15000 range.
1132 hll-sparse-max-bytes 3000
1133
1134 # Streams macro node max size / items. The stream data structure is a radix
1135 # tree of big nodes that encode multiple items inside. Using this configuration
1136 # it is possible to configure how big a single node can be in bytes, and the
1137 # maximum number of items it may contain before switching to a new node when
1138 # appending new stream entries. If any of the following settings are set to
1139 # zero, the limit is ignored, so for instance it is possible to set just a
1140 # max entires limit by setting max-bytes to 0 and max-entries to the desired
1141 # value.
1142 stream-node-max-bytes 4096
1143 stream-node-max-entries 100
1144
1145 # Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
1146 # order to help rehashing the main Redis hash table (the one mapping top-level
1147 # keys to values). The hash table implementation Redis uses (see dict.c)
1148 # performs a lazy rehashing: the more operation you run into a hash table
1149 # that is rehashing, the more rehashing "steps" are performed, so if the
1150 # server is idle the rehashing is never complete and some more memory is used
1151 # by the hash table.
1152 #
1153 # The default is to use this millisecond 10 times every second in order to
1154 # actively rehash the main dictionaries, freeing memory when possible.
1155 #
1156 # If unsure:
1157 # use "activerehashing no" if you have hard latency requirements and it is
1158 # not a good thing in your environment that Redis can reply from time to time
1159 # to queries with 2 milliseconds delay.
1160 #
1161 # use "activerehashing yes" if you don't have such hard requirements but
1162 # want to free memory asap when possible.
1163 activerehashing yes
1164
1165 # The client output buffer limits can be used to force disconnection of clients
1166 # that are not reading data from the server fast enough for some reason (a
1167 # common reason is that a Pub/Sub client can't consume messages as fast as the
1168 # publisher can produce them).
1169 #
1170 # The limit can be set differently for the three different classes of clients:
1171 #
1172 # normal -> normal clients including MONITOR clients
1173 # replica  -> replica clients
1174 # pubsub -> clients subscribed to at least one pubsub channel or pattern
1175 #
1176 # The syntax of every client-output-buffer-limit directive is the following:
1177 #
1178 # client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
1179 #
1180 # A client is immediately disconnected once the hard limit is reached, or if
1181 # the soft limit is reached and remains reached for the specified number of
1182 # seconds (continuously).
1183 # So for instance if the hard limit is 32 megabytes and the soft limit is
1184 # 16 megabytes / 10 seconds, the client will get disconnected immediately
1185 # if the size of the output buffers reach 32 megabytes, but will also get
1186 # disconnected if the client reaches 16 megabytes and continuously overcomes
1187 # the limit for 10 seconds.
1188 #
1189 # By default normal clients are not limited because they don't receive data
1190 # without asking (in a push way), but just after a request, so only
1191 # asynchronous clients may create a scenario where data is requested faster
1192 # than it can read.
1193 #
1194 # Instead there is a default limit for pubsub and replica clients, since
1195 # subscribers and replicas receive data in a push fashion.
1196 #
1197 # Both the hard or the soft limit can be disabled by setting them to zero.
1198 client-output-buffer-limit normal 0 0 0
1199 client-output-buffer-limit replica 256mb 64mb 60
1200 client-output-buffer-limit pubsub 32mb 8mb 60
1201
1202 # Client query buffers accumulate new commands. They are limited to a fixed
1203 # amount by default in order to avoid that a protocol desynchronization (for
1204 # instance due to a bug in the client) will lead to unbound memory usage in
1205 # the query buffer. However you can configure it here if you have very special
1206 # needs, such us huge multi/exec requests or alike.
1207 #
1208 # client-query-buffer-limit 1gb
1209
1210 # In the Redis protocol, bulk requests, that are, elements representing single
1211 # strings, are normally limited ot 512 mb. However you can change this limit
1212 # here.
1213 #
1214 # proto-max-bulk-len 512mb
1215
1216 # Redis calls an internal function to perform many background tasks, like
1217 # closing connections of clients in timeout, purging expired keys that are
1218 # never requested, and so forth.
1219 #
1220 # Not all tasks are performed with the same frequency, but Redis checks for
1221 # tasks to perform according to the specified "hz" value.
1222 #
1223 # By default "hz" is set to 10. Raising the value will use more CPU when
1224 # Redis is idle, but at the same time will make Redis more responsive when
1225 # there are many keys expiring at the same time, and timeouts may be
1226 # handled with more precision.
1227 #
1228 # The range is between 1 and 500, however a value over 100 is usually not
1229 # a good idea. Most users should use the default of 10 and raise this up to
1230 # 100 only in environments where very low latency is required.
1231 hz 10
1232
1233 # Normally it is useful to have an HZ value which is proportional to the
1234 # number of clients connected. This is useful in order, for instance, to
1235 # avoid too many clients are processed for each background task invocation
1236 # in order to avoid latency spikes.
1237 #
1238 # Since the default HZ value by default is conservatively set to 10, Redis
1239 # offers, and enables by default, the ability to use an adaptive HZ value
1240 # which will temporary raise when there are many connected clients.
1241 #
1242 # When dynamic HZ is enabled, the actual configured HZ will be used as
1243 # as a baseline, but multiples of the configured HZ value will be actually
1244 # used as needed once more clients are connected. In this way an idle
1245 # instance will use very little CPU time while a busy instance will be
1246 # more responsive.
1247 dynamic-hz yes
1248
1249 # When a child rewrites the AOF file, if the following option is enabled
1250 # the file will be fsync-ed every 32 MB of data generated. This is useful
1251 # in order to commit the file to the disk more incrementally and avoid
1252 # big latency spikes.
1253 aof-rewrite-incremental-fsync yes
1254
1255 # When redis saves RDB file, if the following option is enabled
1256 # the file will be fsync-ed every 32 MB of data generated. This is useful
1257 # in order to commit the file to the disk more incrementally and avoid
1258 # big latency spikes.
1259 rdb-save-incremental-fsync yes
1260
1261 # Redis LFU eviction (see maxmemory setting) can be tuned. However it is a good
1262 # idea to start with the default settings and only change them after investigating
1263 # how to improve the performances and how the keys LFU change over time, which
1264 # is possible to inspect via the OBJECT FREQ command.
1265 #
1266 # There are two tunable parameters in the Redis LFU implementation: the
1267 # counter logarithm factor and the counter decay time. It is important to
1268 # understand what the two parameters mean before changing them.
1269 #
1270 # The LFU counter is just 8 bits per key, it's maximum value is 255, so Redis
1271 # uses a probabilistic increment with logarithmic behavior. Given the value
1272 # of the old counter, when a key is accessed, the counter is incremented in
1273 # this way:
1274 #
1275 # 1. A random number R between 0 and 1 is extracted.
1276 # 2. A probability P is calculated as 1/(old_value*lfu_log_factor+1).
1277 # 3. The counter is incremented only if R < P.
1278 #
1279 # The default lfu-log-factor is 10. This is a table of how the frequency
1280 # counter changes with a different number of accesses with different
1281 # logarithmic factors:
1282 #
1283 # +--------+------------+------------+------------+------------+------------+
1284 # | factor | 100 hits   | 1000 hits  | 100K hits  | 1M hits    | 10M hits   |
1285 # +--------+------------+------------+------------+------------+------------+
1286 # | 0      | 104        | 255        | 255        | 255        | 255        |
1287 # +--------+------------+------------+------------+------------+------------+
1288 # | 1      | 18         | 49         | 255        | 255        | 255        |
1289 # +--------+------------+------------+------------+------------+------------+
1290 # | 10     | 10         | 18         | 142        | 255        | 255        |
1291 # +--------+------------+------------+------------+------------+------------+
1292 # | 100    | 8          | 11         | 49         | 143        | 255        |
1293 # +--------+------------+------------+------------+------------+------------+
1294 #
1295 # NOTE: The above table was obtained by running the following commands:
1296 #
1297 #   redis-benchmark -n 1000000 incr foo
1298 #   redis-cli object freq foo
1299 #
1300 # NOTE 2: The counter initial value is 5 in order to give new objects a chance
1301 # to accumulate hits.
1302 #
1303 # The counter decay time is the time, in minutes, that must elapse in order
1304 # for the key counter to be divided by two (or decremented if it has a value
1305 # less <= 10).
1306 #
1307 # The default value for the lfu-decay-time is 1. A Special value of 0 means to
1308 # decay the counter every time it happens to be scanned.
1309 #
1310 # lfu-log-factor 10
1311 # lfu-decay-time 1
1312
1313 ########################### ACTIVE DEFRAGMENTATION #######################
1314 #
1315 # WARNING THIS FEATURE IS EXPERIMENTAL. However it was stress tested
1316 # even in production and manually tested by multiple engineers for some
1317 # time.
1318 #
1319 # What is active defragmentation?
1320 # -------------------------------
1321 #
1322 # Active (online) defragmentation allows a Redis server to compact the
1323 # spaces left between small allocations and deallocations of data in memory,
1324 # thus allowing to reclaim back memory.
1325 #
1326 # Fragmentation is a natural process that happens with every allocator (but
1327 # less so with Jemalloc, fortunately) and certain workloads. Normally a server
1328 # restart is needed in order to lower the fragmentation, or at least to flush
1329 # away all the data and create it again. However thanks to this feature
1330 # implemented by Oran Agra for Redis 4.0 this process can happen at runtime
1331 # in an "hot" way, while the server is running.
1332 #
1333 # Basically when the fragmentation is over a certain level (see the
1334 # configuration options below) Redis will start to create new copies of the
1335 # values in contiguous memory regions by exploiting certain specific Jemalloc
1336 # features (in order to understand if an allocation is causing fragmentation
1337 # and to allocate it in a better place), and at the same time, will release the
1338 # old copies of the data. This process, repeated incrementally for all the keys
1339 # will cause the fragmentation to drop back to normal values.
1340 #
1341 # Important things to understand:
1342 #
1343 # 1. This feature is disabled by default, and only works if you compiled Redis
1344 #    to use the copy of Jemalloc we ship with the source code of Redis.
1345 #    This is the default with Linux builds.
1346 #
1347 # 2. You never need to enable this feature if you don't have fragmentation
1348 #    issues.
1349 #
1350 # 3. Once you experience fragmentation, you can enable this feature when
1351 #    needed with the command "CONFIG SET activedefrag yes".
1352 #
1353 # The configuration parameters are able to fine tune the behavior of the
1354 # defragmentation process. If you are not sure about what they mean it is
1355 # a good idea to leave the defaults untouched.
1356
1357 # Enabled active defragmentation
1358 # activedefrag yes
1359
1360 # Minimum amount of fragmentation waste to start active defrag
1361 # active-defrag-ignore-bytes 100mb
1362
1363 # Minimum percentage of fragmentation to start active defrag
1364 # active-defrag-threshold-lower 10
1365
1366 # Maximum percentage of fragmentation at which we use maximum effort
1367 # active-defrag-threshold-upper 100
1368
1369 # Minimal effort for defrag in CPU percentage
1370 # active-defrag-cycle-min 5
1371
1372 # Maximal effort for defrag in CPU percentage
1373 # active-defrag-cycle-max 75
1374
1375 # Maximum number of set/hash/zset/list fields that will be processed from
1376 # the main dictionary scan
1377 # active-defrag-max-scan-fields 1000

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posted @ 2019-06-25 19:10  程序猿辉辉  阅读(...)  评论(...编辑  收藏