利用工具搭建redis集群和利用工具扩容redis集群
一利用工具搭建redis集群
0前提条件：
执行下列步骤的前提是已经安装了redis，配置了服务器之间的互信以及添加了域名解析参考网址：
https://www.cnblogs.com/tyjs09/p/14601241.html
1安装redis支持的插件（不指定版本会给你安装最旧的）：
[root@db01 ~]# yum makecache fast
[root@db01 ~]# yum install rubygems
[root@db01 ~]# gem sources --remove https://rubygems.org/
[root@db01 ~]# gem sources -a http://mirrors.aliyun.com/rubygems/
[root@db01 ~]# gem update - system
[root@db01 ~]# gem install redis -v 3.3.5
2分别在三台机器中清除掉旧数据：
[root@db01 ~]# pkill redis
[root@db01 ~]# ps -ef|grep redis
[root@db01 ~]# rm -rf /opt/redis_cluster/redis_{6380,6381}/{conf,logs,pid}
[root@db01 ~]# rm -rf /data/redis_cluster/redis_{6380,6381}
[root@db01 ~]# mkdir -p /opt/redis_cluster/redis_{6380,6381}/{conf,logs,pid}
[root@db01 ~]# mkdir -p /data/redis_cluster/redis_{6380,6381}
[root@db01 ~]#
3将redis执行脚本上传至服务器家目录中：
链接：https://pan.baidu.com/s/1aaEF9wosg-UX-ufxYMOteA
提取码：abcd
[root@db01 ~]# sh redis_shell.sh stop 6380 #停止6380
[root@db01 ~]# sh redis_shell.sh ps #查看redis进程
[root@db01 ~]# sh redis_shell.sh start 6380 #运行6380
[root@db01 ~]# sh redis_shell.sh tail 6380 #查看端口日志
[root@db01 ~]# sh redis_shell.sh restart 6380 #重启6380端口
4编写6380和6381的配置文件并将配置文件发送到其它服务器节点上：
[root@db01 ~]# cat >/opt/redis_cluster/redis_6380/conf/redis_6380.conf<<EOF > bind 10.0.0.201 > port 6380 > daemonize yes > pidfile "/opt/redis_cluster/redis_6380/pid/redis_6380.pid" > logfile "/opt/redis_cluster/redis_6380/logs/redis_6380.log" > dbfilename "redis_6380.rdb" > dir "/data/redis_cluster/redis_6380/" > cluster-enabled yes > cluster-config-file nodes_6380.conf > cluster-node-timeout 15000 > EOF [root@db01 ~]# cd /opt/redis_cluster/ [root@db01 redis_cluster]# cp redis_6380/conf/redis_6380.conf redis_6381/conf/redis_6381.conf [root@db01 redis_cluster]# sed -i 's#6380#6381#g' redis_6381/conf/redis_6381.conf [root@db01 redis_cluster]# rsync -avz /opt/redis_cluster/redis_638* db02:/opt/redis_cluster/ [root@db01 redis_cluster]# rsync -avz /opt/redis_cluster/redis_638* db03:/opt/redis_cluster/
5修改其它集群中配置文件里的ip后启动所有节点：
[root@db01 ~]# sh redis_shell.sh start 6380
[root@db01 ~]# sh redis_shell.sh start 6381
[root@db01 ~]# ps -ef|grep redis
[root@db02 ~]# find /opt/redis_cluster/redis_638* -type f -name "*.conf"|xargs sed -i "/bind/s#201#202#g"
[root@db03 ~]# find /opt/redis_cluster/redis_638* -type f -name "*.conf"|xargs sed -i "/bind/s#201#203#g"
6使用工具搭建redis集群：
[root@db01 ~]# cd /opt/redis_cluster/redis/src/
[root@db01 src]# ./redis-trib.rb create --replicas 1 10.0.0.201:6380 10.0.0.202:6380 10.0.0.203:6380 10.0.0.201:6381 10.0.0.202:6381 10.0.0.203:6381
7修改工具主从复制（工具小bug）：
[root@db01 ~]# sh redis_shell.sh login 6380
10.0.0.201:6380> cluster nodes
ecaef5e2b992205f47de8230a47e7afcad69b1a1 10.0.0.203:6381 slave be9f4f5d37052b04c63045fc631d0d336def2fdc 0 1618416373199 6 connected
4407f27c55386e16501e28deefcb968e12502697 10.0.0.201:6381 slave 50f925532d5c3b5acc98d3ab2266aea3975c9e3f 0 1618416370175 4 connected
50f925532d5c3b5acc98d3ab2266aea3975c9e3f 10.0.0.202:6380 master - 0 1618416371184 2 connected 5461-10922
be9f4f5d37052b04c63045fc631d0d336def2fdc 10.0.0.203:6380 master - 0 1618416367150 3 connected 10923-16383
85ca53d73950ad2a6b53a1af678cdf097e7b5d06 10.0.0.202:6381 slave bedd4b0e703454112cb0596e5f568aa5296ef6a4 0 1618416372188 5 connected
bedd4b0e703454112cb0596e5f568aa5296ef6a4 10.0.0.201:6380 myself,master - 0 0 1 connected 0-5460
10.0.0.201:6380>
[root@db01 ~]# redis-cli -c -h db02 -p 6381 be9f4f5d37052b04c63045fc631d0d336def2fdc
(error) ERR unknown command 'be9f4f5d37052b04c63045fc631d0d336def2fdc'
[root@db01 ~]# redis-cli -c -h db02 -p 6381 cluster replicate be9f4f5d37052b04c63045fc631d0d336def2fdc
OK
[root@db01 ~]# redis-cli -c -h db03 -p 6381 cluster replicate bedd4b0e703454112cb0596e5f568aa5296ef6a4
OK
[root@db01 ~]# redis-cli -c -h db01 -p 6380 cluster nodes
ecaef5e2b992205f47de8230a47e7afcad69b1a1 10.0.0.203:6381 slave bedd4b0e703454112cb0596e5f568aa5296ef6a4 0 1618416612195 6 connected
4407f27c55386e16501e28deefcb968e12502697 10.0.0.201:6381 slave 50f925532d5c3b5acc98d3ab2266aea3975c9e3f 0 1618416609171 4 connected
50f925532d5c3b5acc98d3ab2266aea3975c9e3f 10.0.0.202:6380 master - 0 1618416611190 2 connected 5461-10922
be9f4f5d37052b04c63045fc631d0d336def2fdc 10.0.0.203:6380 master - 0 1618416613204 3 connected 10923-16383
85ca53d73950ad2a6b53a1af678cdf097e7b5d06 10.0.0.202:6381 slave be9f4f5d37052b04c63045fc631d0d336def2fdc 0 1618416608164 5 connected
bedd4b0e703454112cb0596e5f568aa5296ef6a4 10.0.0.201:6380 myself,master - 0 0 1 connected 0-5460
[root@db01 ~]#
8检查集群的完整性：
[root@db01 ~]# cd /opt/redis_cluster/redis/src
[root@db01 src]# ./redis-trib.rb check 10.0.0.201:6380
9检查槽位是否都在合理的误差范围内：
[root@db01 src]# ./redis-trib.rb rebalance 10.0.0.201:6380
二利用工具对redis集群进行扩容：
1添加一对主从并创建配置文件和数据目录
[root@db01 src]# mkdir -p /opt/redis_cluster/redis_{6390,6391}/{conf,logs,pid}
[root@db01 src]# mkdir -p /data/redis_cluster/redis_{6390,6391}
[root@db01 src]# cd /opt/redis_cluster/
[root@db01 redis_cluster]# cp redis_6380/conf/redis_6380.conf redis_6390/conf/redis_6390.conf
[root@db01 redis_cluster]# cp redis_6381/conf/redis_6381.conf redis_6391/conf/redis_6391.conf
[root@db01 redis_cluster]# sed -i 's#6380#6390#g' redis_6390/conf/redis_6390.conf
[root@db01 redis_cluster]# sed -i 's#6381#6391#g' redis_6391/conf/redis_6391.conf
2启动新增的主从节点：
[root@db01 ~]# sh redis_shell.sh start 6390
[root@db01 ~]# sh redis_shell.sh start 6391
[root@db01 ~]# sh redis_shell.sh ps
3将新节点添加到集群
[root@db01 ~]# cd /opt/redis_cluster/redis/src [root@db01 src]# ./redis-trib.rb add-node 10.0.0.201:6390 10.0.0.201:6380 [root@db01 src]# ./redis-trib.rb add-node 10.0.0.201:6391 10.0.0.201:6380
4重新分配槽位：
[root@db01 src]# pwd
/opt/redis_cluster/redis/src
[root@db01 src]# ./redis-trib.rb reshard 10.0.0.201:6380
>>> Performing Cluster Check (using node 10.0.0.201:6380)
S: 3a9aeeeb4ac0c76a5ba3c66bb917161348582c01 10.0.0.201:6380
slots: (0 slots) slave
replicates a31deef0baf970cef6c798f1e320fb4ba5543daf
M: ae183c4181d953d1ef052e7db473951390ff9d05 10.0.0.201:6390
slots: (0 slots) master
0 additional replica(s)
M: a31deef0baf970cef6c798f1e320fb4ba5543daf 10.0.0.203:6381
slots:0-5460 (5461 slots) master
1 additional replica(s)
M: 6c4c0f7417dfc14468a73ac94a66634181546721 10.0.0.201:6391
slots: (0 slots) master
0 additional replica(s)
M: e92cd97d2c06d2cc02547bcd7ac64b9f6fb44fb5 10.0.0.203:6380
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 8cea03a478990dc7e6d21f1b671c70dd921fcdb2 10.0.0.201:6381
slots: (0 slots) slave
replicates 9e6565d8f0a8ed0d6d56437dcf4b58cbb17a3c0f
M: 9e6565d8f0a8ed0d6d56437dcf4b58cbb17a3c0f 10.0.0.202:6380
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: c37e5f309b2d07012f2efb11053c517b5f51eba0 10.0.0.202:6381
slots: (0 slots) slave
replicates e92cd97d2c06d2cc02547bcd7ac64b9f6fb44fb5
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
How many slots do you want to move (from 1 to 16384)? 4096 #16384/4=4096因为是4个主从节点，所以除以4
What is the receiving node ID? ae183c4181d953d1ef052e7db473951390ff9d05
Please enter all the source node IDs.
Type 'all' to use all the nodes as source nodes for the hash slots.
Type 'done' once you entered all the source nodes IDs.
Source node #1:all
5检查是否ok：
[root@db01 src]# pwd
/opt/redis_cluster/redis/src
[root@db01 src]# ./redis-trib.rb check 10.0.0.201:6380
6检查扩容后的主从复制关系并用图表达出来：
[root@db01 src]# cd ~
[root@db01 ~]# sh redis_shell.sh login 6380
10.0.0.201:6380> cluster nodes
67858b60a11ea933e5dab3ca29e8bc46ea436bbe 10.0.0.201:6391 master - 0 1618418829049 0 connected
ecaef5e2b992205f47de8230a47e7afcad69b1a1 10.0.0.203:6381 slave bedd4b0e703454112cb0596e5f568aa5296ef6a4 0 1618418829050 6 connected
4407f27c55386e16501e28deefcb968e12502697 10.0.0.201:6381 slave 50f925532d5c3b5acc98d3ab2266aea3975c9e3f 0 1618418831567 4 connected
50f925532d5c3b5acc98d3ab2266aea3975c9e3f 10.0.0.202:6380 master - 0 1618418828042 2 connected 6827-10922
13fe096d888882cd5914edb6acdff809c048a082 10.0.0.201:6390 master - 0 1618418830054 7 connected 0-1364 5461-6826 10923-12287
be9f4f5d37052b04c63045fc631d0d336def2fdc 10.0.0.203:6380 master - 0 1618418832072 3 connected 12288-16383
85ca53d73950ad2a6b53a1af678cdf097e7b5d06 10.0.0.202:6381 slave be9f4f5d37052b04c63045fc631d0d336def2fdc 0 1618418831064 5 connected
bedd4b0e703454112cb0596e5f568aa5296ef6a4 10.0.0.201:6380 myself,master - 0 0 1 connected 1365-5460
10.0.0.201:6380>
![]()
7根据图整理主从关系：
![]()
[root@db01 ~]# sh redis_shell.sh login 6380
10.0.0.201:6380> cluster nodes
67858b60a11ea933e5dab3ca29e8bc46ea436bbe 10.0.0.201:6391 master - 0 1618421082413 0 connected
ecaef5e2b992205f47de8230a47e7afcad69b1a1 10.0.0.203:6381 slave bedd4b0e703454112cb0596e5f568aa5296ef6a4 0 1618421079382 6 connected
4407f27c55386e16501e28deefcb968e12502697 10.0.0.201:6381 slave 50f925532d5c3b5acc98d3ab2266aea3975c9e3f 0 1618421082916 4 connected
50f925532d5c3b5acc98d3ab2266aea3975c9e3f 10.0.0.202:6380 master - 0 1618421078377 2 connected 6827-10922
13fe096d888882cd5914edb6acdff809c048a082 10.0.0.201:6390 master - 0 1618421080387 7 connected 0-1364 5461-6826 10923-12287
be9f4f5d37052b04c63045fc631d0d336def2fdc 10.0.0.203:6380 master - 0 1618421081397 3 connected 12288-16383
85ca53d73950ad2a6b53a1af678cdf097e7b5d06 10.0.0.202:6381 slave be9f4f5d37052b04c63045fc631d0d336def2fdc 0 1618421077370 5 connected
bedd4b0e703454112cb0596e5f568aa5296ef6a4 10.0.0.201:6380 myself,master - 0 0 1 connected 1365-5460
10.0.0.201:6380>
[root@db01 ~]# redis-cli -h db03 -p 6381
db03:6381> cluster replicate 13fe096d888882cd5914edb6acdff809c048a082
OK
db03:6381>
[root@db01 ~]# redis-cli -h db01 -p 6391
db01:6391> cluster replicate bedd4b0e703454112cb0596e5f568aa5296ef6a4
OK
db01:6391> cluster nodes
67858b60a11ea933e5dab3ca29e8bc46ea436bbe 10.0.0.201:6391 myself,slave bedd4b0e703454112cb0596e5f568aa5296ef6a4 0 0 0 connected
bedd4b0e703454112cb0596e5f568aa5296ef6a4 10.0.0.201:6380 master - 0 1618422286146 1 connected 1365-5460
50f925532d5c3b5acc98d3ab2266aea3975c9e3f 10.0.0.202:6380 master - 0 1618422289718 2 connected 6827-10922
ecaef5e2b992205f47de8230a47e7afcad69b1a1 10.0.0.203:6381 slave 13fe096d888882cd5914edb6acdff809c048a082 0 1618422291228 7 connected
85ca53d73950ad2a6b53a1af678cdf097e7b5d06 10.0.0.202:6381 slave be9f4f5d37052b04c63045fc631d0d336def2fdc 0 1618422288713 3 connected
4407f27c55386e16501e28deefcb968e12502697 10.0.0.201:6381 slave 50f925532d5c3b5acc98d3ab2266aea3975c9e3f 0 1618422287705 2 connected
13fe096d888882cd5914edb6acdff809c048a082 10.0.0.201:6390 master - 0 1618422290723 7 connected 0-1364 5461-6826 10923-12287
be9f4f5d37052b04c63045fc631d0d336def2fdc 10.0.0.203:6380 master - 0 1618422285644 3 connected 12288-16383
db01:6391> 
db01:6391> cluster info
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:8
cluster_size:4
cluster_current_epoch:7
cluster_my_epoch:1
cluster_stats_messages_sent:11849
cluster_stats_messages_received:11804
db01:6391>
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