Redis多机多节点集群实验

第一步:环境准备

我们搞两台虚拟机

QQ鎴浘20170727193646.jpg

 

局域网IP 分别是 192.168.1.109和192.168.1.110

我们约定把192.168.1.109作为集群控制端,需要安装redis-trib.rb

 

第二步:安装Redis

前面已经安装过了 不解释,

192.168.1.109虚拟机里,Reids安装包里有个集群工具,要复制到/usr/local/bin里去

cp redis-3.2.9/src/redis-trib.rb /usr/local/bin

 

第三步:修改配置,创建节点

首先我们在192.168.1.109虚拟机里创建三个节点,端口分别是7001,7002,7003

我们先在root目录下新建一个redis_cluster目录,然后该目录下再创建3个目录,

分别是7001,7002,7003,用来存redis配置文件;

这里我们要使用redis集群,要先修改redis的配置文件redis.conf

mkdir redis_cluster 新建目录

[root@localhost ~]#  cd redis_cluster/

[root@localhost redis_cluster]# mkdir 7001 7002 7003

[root@localhost redis_cluster]# ll

总用量 0

drwxr-xr-x. 2 root root 6 7月  27 19:49 7001

drwxr-xr-x. 2 root root 6 7月  27 19:49 7002

drwxr-xr-x. 2 root root 6 7月  27 19:49 7003

[root@localhost redis_cluster]# 

 

先复制一份配置文件到7001目录下

[root@localhost redis_cluster]# cd

[root@localhost ~]# cp redis-3.2.9/redis.conf redis_cluster/7001/

 

我们修改下这个配置文件

vi redis_cluster/7001/redis.conf

修改一下几个

port 7001  //六个节点配置文件分别是7001-7003

bind 192.168.1.109    //默认ip为127.0.0.1 需要改为其他节点机器可访问的ip 否则创建集群时无法访,和单机集群有区别

daemonize yes        //redis后台运行

pidfile /var/run/redis_7001.pid   //pidfile文件对应7001-7003

cluster-enabled yes   //开启集群

cluster-config-file nodes_7001.conf  //保存节点配置,自动创建,自动更新对应7001-7003

cluster-node-timeout 5000    //集群超时时间,节点超过这个时间没反应就断定是宕机

appendonly yes   //存储方式,aof,将写操作记录保存到日志中

 

7001下的修改完后,我们把7001下的配置分别复制到7002-7003 然后对应的再修改下配置即可;

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7002/

[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7003/

 

[root@localhost ~]# vi redis_cluster/7002/redis.conf 

[root@localhost ~]# vi redis_cluster/7003/redis.conf 

[root@localhost ~]# vi redis_cluster/7004/redis.conf 

编辑后面5个配置文件,把 port ,pidfile,cluster-config-file 分别修改下即可;

 

 

同理 192.168.1.110机器,也搞一个redis_cluster目录,然后再新建7004,7005,7006目录,

复制三份配置文件 其他一样,就端口和bind地址改下即可;这里不啰嗦了;

 

第四步:启动两台机器的六个节点

192.168.1.109机器

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7001/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7002/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7003/redis.conf 

[root@localhost ~]# ps -ef | grep redis  

root       2242      1  0 19:55 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.1.109:7001 [cluster]

root       2252      1  0 19:59 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.1.109:7002 [cluster]

root       2256      1  0 19:59 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.1.109:7003 [cluster]

root       2260   2214  0 19:59 pts/0    00:00:00 grep --color=auto redis

 

192.168.1.110机器

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7004/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7005/redis.conf 

[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7006/redis.conf 

[root@localhost ~]# ps -ef | grep redis  

root       2347      1  0 20:31 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.1.110:7004 [cluster]

root       2351      1  0 20:31 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.1.110:7005 [cluster]

root       2355      1  0 20:31 ?        00:00:00 /usr/local/redis/bin/redis-server 192.168.1.110:7006 [cluster]

root       2363   2270  0 20:32 pts/0    00:00:00 grep --color=auto redis

 

说明都启动OK

 

第五步:设置防火墙,开放集群端口

两台机器的防火墙我们直接关掉

systemctl stop firewalld.service

 

第六步:创建集群

192.168.1.109机器作为集群控制端

redis官方提供了redis-trib.rb工具,第一步里已经房到里bin下 ;

但是在使用之前 需要安装ruby,以及redis和ruby连接

yum -y install ruby ruby-devel rubygems rpm-build

gem install redis

 

redis-trib.rb create --replicas 1  192.168.1.109:7001 192.168.1.109:7002 192.168.1.109:7003 192.168.1.110:7004 192.168.1.110:7005 192.168.1.110:7006

创建集群

>>> Creating cluster

>>> Performing hash slots allocation on 6 nodes...

Using 3 masters:

192.168.1.109:7001

192.168.1.110:7004

192.168.1.109:7002

Adding replica 192.168.1.110:7005 to 192.168.1.109:7001

Adding replica 192.168.1.109:7003 to 192.168.1.110:7004

Adding replica 192.168.1.110:7006 to 192.168.1.109:7002

M: 08d5f59fa053d79e3cc71fc5bb8759bec191ff41 192.168.1.109:7001

   slots:0-5460 (5461 slots) master

M: 4bda83bae0aeb9988aeb7d34eff2cc75226a0edd 192.168.1.109:7002

   slots:10923-16383 (5461 slots) master

S: b782f527ead6f63c8278c1b0713b92a9fd4fe995 192.168.1.109:7003

   replicates 86c8cb7975f85a859147fef9672d44b24c5a718b

M: 86c8cb7975f85a859147fef9672d44b24c5a718b 192.168.1.110:7004

   slots:3671,5461-10922,11797,15924 (5465 slots) master

S: 2d44accacb1bb4cd1eef5f98f7af64a43f01544d 192.168.1.110:7005

   replicates 08d5f59fa053d79e3cc71fc5bb8759bec191ff41

S: 2c42433953bcd3ad47015d9f8ac72e7a7cf447c5 192.168.1.110:7006

   replicates 4bda83bae0aeb9988aeb7d34eff2cc75226a0edd

Can I set the above configuration? (type 'yes' to accept):

 

从运行结果看 主节点就是7001 7004 7002 从节点分别是7005 7003 7006 

7001分配到的哈希槽是 0-5460

7004分配到的哈希槽是 5461-10922

7002分配到的哈希槽是 10923-16383

最后问我们是否接受上面的设置,输入yes 就表示接受,我们输入yes

然后显示:

>>> Nodes configuration updated

>>> Assign a different config epoch to each node

>>> Sending CLUSTER MEET messages to join the cluster

Waiting for the cluster to join...

>>> Performing Cluster Check (using node 192.168.1.109:7001)

M: d06aebf92e99169864893decc371e34cd321640f 192.168.1.109:7001

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

M: 189dc189dd743f9fc61c439d44cc3379d8cbe535 192.168.1.110:7004

   slots:5461-10922 (5462 slots) master

   1 additional replica(s)

S: fe2b0038304c02bc807c38fe006338bd5dd85a70 192.168.1.110:7006

   slots: (0 slots) slave

   replicates 25a6be3b62fa675a3835e6c62641c3784ec62257

M: 25a6be3b62fa675a3835e6c62641c3784ec62257 192.168.1.109:7002

   slots:10923-16383 (5461 slots) master

   1 additional replica(s)

S: df28512d63af4a3e6dc1739e1c267ba916f3a579 192.168.1.110:7005

   slots: (0 slots) slave

   replicates d06aebf92e99169864893decc371e34cd321640f

S: aaa3310d3c30cc9a7f235db27e3c395a5e180a52 192.168.1.109:7003

   slots: (0 slots) slave

   replicates 189dc189dd743f9fc61c439d44cc3379d8cbe535

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

显示配置哈希槽,以及集群创建成功,可以用了;

 

第七步:集群数据测试

我们先连接任意一个节点,然后添加一个key:

redis-cli是redis默认的客户端工具,启动时加上`-c`参数,`-p`指定端口,就可以连接到集群。

这里还得加-h 指定机器IP 

连接任意一个节点端口:

[root@localhost ~]# /usr/local/redis/bin/redis-cli -h 192.168.1.109 -c -p 7002

192.168.1.109:7002> 

连接到7002节点

192.168.1.109:7002> set xxx 'fadfa'

-> Redirected to slot [4038] located at 192.168.1.109:7001

OK

前面说过Redis Cluster值分配规则,所以分配key的时候,它会使用CRC16(‘my_name’)%16384算法,来计算,将这个key 放到哪个节点,这里分配到了4038slot 就分配到了7001(0-5460)这个节点上。所以有:

Redirected to slot [4038] located at 192.168.1.109:7001

我们从其他集群节点 ,都可以获取到数据

[root@localhost ~]# /usr/local/redis/bin/redis-cli -h 192.168.1.110 -c -p 7005

192.168.1.110:7005> 

192.168.1.110:7005> get xxx

-> Redirected to slot [4038] located at 192.168.1.109:7001

"fadfa"

192.168.1.109:7001> 

 

第八步:集群宕机测试

假如我们干掉一个节点,比如7002 这个主节点

[root@localhost ~]# ps -ef | grep redis  

root       9799      1  0 21:33 ?        00:00:02 /usr/local/redis/bin/redis-server 192.168.1.109:7001 [cluster]

root       9803      1  0 21:33 ?        00:00:02 /usr/local/redis/bin/redis-server 192.168.1.109:7002 [cluster]

root       9807      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.109:7003 [cluster]

root       9830   2214  0 21:53 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# kill -9 9803

[root@localhost ~]# ps -ef | grep redis  

root       9799      1  0 21:33 ?        00:00:02 /usr/local/redis/bin/redis-server 192.168.1.109:7001 [cluster]

root       9807      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.109:7003 [cluster]

root       9832   2214  0 21:54 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# 

然后我们查看下集群情况

[root@localhost ~]# redis-trib.rb check 192.168.1.109:7001

>>> Performing Cluster Check (using node 192.168.1.109:7001)

M: d06aebf92e99169864893decc371e34cd321640f 192.168.1.109:7001

   slots:0-5460 (5461 slots) master

   1 additional replica(s)

M: 189dc189dd743f9fc61c439d44cc3379d8cbe535 192.168.1.110:7004

   slots:5461-10922 (5462 slots) master

   1 additional replica(s)

M: fe2b0038304c02bc807c38fe006338bd5dd85a70 192.168.1.110:7006

   slots:10923-16383 (5461 slots) master

   0 additional replica(s)

S: df28512d63af4a3e6dc1739e1c267ba916f3a579 192.168.1.110:7005

   slots: (0 slots) slave

   replicates d06aebf92e99169864893decc371e34cd321640f

S: aaa3310d3c30cc9a7f235db27e3c395a5e180a52 192.168.1.109:7003

   slots: (0 slots) slave

   replicates 189dc189dd743f9fc61c439d44cc3379d8cbe535

[OK] All nodes agree about slots configuration.

>>> Check for open slots...

>>> Check slots coverage...

[OK] All 16384 slots covered.

我们发现 7006本来是从节点,由于他对应的主节点挂了,就自动变成主节点master,所有会有最后一个说明

 

 All 16384 slots covered. 所有哈希槽都可覆盖了; 集群可以正常使用;

 

假如我们把7006也干掉,试试看

[root@localhost ~]# ps -ef | grep redis  

root       2578      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.110:7004 [cluster]

root       2582      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.110:7005 [cluster]

root       2586      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.110:7006 [cluster]

root       2623   2270  0 21:56 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# kill -9 2586

[root@localhost ~]# ps -ef | grep redis  

root       2578      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.110:7004 [cluster]

root       2582      1  0 21:33 ?        00:00:03 /usr/local/redis/bin/redis-server 192.168.1.110:7005 [cluster]

root       2625   2270  0 21:56 pts/0    00:00:00 grep --color=auto redis

[root@localhost ~]# 

 

[root@localhost ~]# redis-trib.rb check 192.168.1.109:7001

7.jpg

这里我们发现 出事了,因为主从节点都挂了 所以有一部分哈希槽没得分配,最后一句

[ERR] Not all 16384 slots are covered by nodes.  没有安全覆盖;

所以不能正常使用集群

 

posted @ 2018-03-15 09:51 汪强胜 Views(...) Comments(...) Edit 收藏