首先确定自己需要建立多少个Redis主节点，因为Redis集群需要进行选举判决，所以主节点个数必须去奇数个，也就是说集群里面最少的主节点个数就是3个。因为每个主节点至少有一个备份节点，所以面我将在一台Linux服务器（在多台linux服务器之间搭建集群的流程和一台上搭建一样）里面搭建一个主节点为3个总节点数为6个的Redis集群，其中谁为主节点谁为副节点由集群自己判断。
redis的各个版本的下载地址：redis下载
redis的中文版的集群资料可以访问：http://www.redis.cn/topics/cluster-tutorial.html
安装配置redis
上传redis的安装包到服务器，编译安装 PREFIX后面写的是自己的安装路径
[root@inode-2 server]# tar -zxvf redis-4.0.9.tar.gz [root@inode-2 server]# cd redis-4.0.9/ [root@inode-2 redis-4.0.9]# make [root@inode-2 redis-4.0.9]# make install PREFIX=/export/server/redis-cluster如果运行make出现 ： gcc: Command not found 此类错误则安装gcc即可，然后删除redis-4.0.9，重新编译安装
[root@inode-2 redis-4.0.9]# yum -y install gcc automake autoconf libtool make [root@inode-2 redis-4.0.9]# yum install gcc gcc-c++
正确编译安装后安装目录下会有一个bin文件夹，我们将这个bin文件夹复制5份就得到了redis集群的6个节点。我将这个6个bin文件夹分别命名为redis01到redis06。然后在redis01里面新建一个redis.conf配置文件，写入相关配置，然后将配置文件复制到其余5个文件夹。
[root@inode-2 redis01]# vi redis.conf
然后将如下内容写入redis.conf文件，其中port是这个redis的端口号，将redis.conf文件复制给其余5个文件夹时端口号要修改，我是配置的7001~7006
daemonize yes port 7001 cluster-enabled yes cluster-config-file nodes.conf cluster-node-timeout 15000 appendonly yes protected-mode no
要创建redis集群要用到redis-trib，安装redis-trib需要ruby环境，复制redis解压文件src下的redis-trib.rb文件到redis-cluster目录
[root@inode-2 redis-cluster]# cp /export/server/redis-4.0.9/src/redis-trib.rb ./
安装ruby环境
我们需要ruby版本要大于等于2.2.2所以我先安装RVM，通过RVM来安装高版本ruby
[root@inode-2 redis-cluster]# gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB [root@inode-2 redis-cluster]# curl -sSL https://get.rvm.io | bash -s stable [root@inode-2 redis-cluster]# source /etc/profile.d/rvm.sh [root@inode-2 redis-cluster]# rvm reload [root@inode-2 redis-cluster]# rvm requirements run [root@inode-2 redis-cluster]# rvm install 2.4.4 [root@inode-2 redis-cluster]# ruby -v
之后再安装rubygem redis依赖
[root@inode-2 redis-cluster]# wget http://rubygems.org/downloads/redis-4.0.1.gem [root@inode-2 redis-cluster]# gem install ./redis-4.0.1.gem
安装到这里redis集群所需要的环境就安装完全了，我们可以编写一个startall.sh的脚本来启动所有的redis节点
#!/bin/bash cd ./redis01 ./redis-server ./redis.conf cd ../redis02 ./redis-server ./redis.conf cd ../redis03 ./redis-server ./redis.conf cd ../redis04 ./redis-server ./redis.conf cd ../redis05 ./redis-server ./redis.conf cd ../redis06 ./redis-server ./redis.conf
给startall.sh赋权限并启动所有redis
[root@inode-2 redis-cluster]# chmod 755 startall.sh [root@inode-2 redis-cluster]# ./startall.sh
查看redis运行进程是否启动成功，看到端口号7001~7006，6个节点都启动成功
[root@inode-2 redis-cluster]# ps aux | grep redis root 1374 0.0 0.7 145308 7580 ? Ssl 08:46 0:00 ./redis-server *:7001 [cluster] root 1379 0.0 0.7 145308 7584 ? Ssl 08:46 0:00 ./redis-server *:7002 [cluster] root 1384 0.0 0.7 145308 7584 ? Ssl 08:46 0:00 ./redis-server *:7003 [cluster] root 1389 0.0 0.7 145308 7588 ? Ssl 08:46 0:00 ./redis-server *:7004 [cluster] root 1394 0.0 0.7 145308 7584 ? Ssl 08:46 0:00 ./redis-server *:7005 [cluster] root 1457 0.0 0.7 145308 7580 ? Ssl 08:51 0:00 ./redis-server *:7006 [cluster] root 1462 0.0 0.0 112704 972 pts/0 R+ 08:51 0:00 grep --color=auto redis
我们可以通过进程名称用pkill来杀掉redis进程来让redis停止
[root@inode-2 redis-cluster]# pkill -9 redis [root@inode-2 redis-cluster]# ps aux | grep redis root 1465 0.0 0.0 112704 968 pts/0 R+ 08:54 0:00 grep --color=auto redis
创建redis集群
使用redis-trib.rb创建集群，在这之前保证6个节点都已经开启，不然会报一下错误，下面的192.168.231.13是我虚拟机的ip，你需要换成你自己的服务器ip，或者你也可以写127.0.0.1，不过我不建议写127.0.0.1，因为它会让其它服务器或者你windows上的redis访问工具连接不上你的redis集群
[root@inode-2 redis-cluster]# ./redis-trib.rb create --replicas 1 192.168.231.13:7001 192.168.231.13:7002 192.168.231.13:7003 192.168.231.13:7004 192.168.231.13:7005 192.168.231.13:7006 >>> Creating cluster [ERR] Sorry, can't connect to node 192.168.231.13:7001
中途会出现Can I set the above configuration? (type 'yes' to accept):提示你是否可以设置，输入yes即可
[root@inode-2 redis-cluster]# ./redis-trib.rb create --replicas 1 192.168.231.13:7001 192.168.231.13:7002 192.168.231.13:7003 192.168.231.13:7004 192.168.231.13:7005 192.168.231.13:7006 >>> Creating cluster >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 192.168.231.13:7001 192.168.231.13:7002 192.168.231.13:7003 Adding replica 192.168.231.13:7005 to 192.168.231.13:7001 Adding replica 192.168.231.13:7006 to 192.168.231.13:7002 Adding replica 192.168.231.13:7004 to 192.168.231.13:7003 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: e4678a9a8410bf5d2c653e6848c1c7ba68a3e21e 192.168.231.13:7001 slots:0-5460 (5461 slots) master M: 486f781e0f1ba8f23f963f7e99b0995e2fcd9fda 192.168.231.13:7002 slots:5461-10922 (5462 slots) master M: 69f56075e9542d9fa000eaa72f67c5a023f65eff 192.168.231.13:7003 slots:10923-16383 (5461 slots) master S: 32a1a109212a5d6ac0e8b518c6df184445714a72 192.168.231.13:7004 replicates 69f56075e9542d9fa000eaa72f67c5a023f65eff S: 28fb9022061f2fa40c2a0fc7fddf909d2f9a5609 192.168.231.13:7005 replicates e4678a9a8410bf5d2c653e6848c1c7ba68a3e21e S: 63b909534ee5fae34200cf63e70b3bf1f162ce8c 192.168.231.13:7006 replicates 486f781e0f1ba8f23f963f7e99b0995e2fcd9fda Can I set the above configuration? (type 'yes' to accept): yes >>> 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 192.168.231.13:7001) M: e4678a9a8410bf5d2c653e6848c1c7ba68a3e21e 192.168.231.13:7001 slots:0-5460 (5461 slots) master 1 additional replica(s) M: 69f56075e9542d9fa000eaa72f67c5a023f65eff 192.168.231.13:7003 slots:10923-16383 (5461 slots) master 1 additional replica(s) S: 28fb9022061f2fa40c2a0fc7fddf909d2f9a5609 192.168.231.13:7005 slots: (0 slots) slave replicates e4678a9a8410bf5d2c653e6848c1c7ba68a3e21e M: 486f781e0f1ba8f23f963f7e99b0995e2fcd9fda 192.168.231.13:7002 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: 63b909534ee5fae34200cf63e70b3bf1f162ce8c 192.168.231.13:7006 slots: (0 slots) slave replicates 486f781e0f1ba8f23f963f7e99b0995e2fcd9fda S: 32a1a109212a5d6ac0e8b518c6df184445714a72 192.168.231.13:7004 slots: (0 slots) slave replicates 69f56075e9542d9fa000eaa72f67c5a023f65eff [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
redis集群测试
我们的redis集群就创建好了，然后我们可以测试一下自己集群是否正常工作，我们通过redis-cli随便连接一个redis
[root@inode-2 redis02]# ./redis-cli -c -p 7003 127.0.0.1:7003> set redis_key redis_value OK 127.0.0.1:7003>
通过Ctrl+C跳出7003端口的redis连接，然后我们去端口7005的redis获取redis_key看能不能获得redis_value
[root@inode-2 redis02]# ./redis-cli -c -p 7005 127.0.0.1:7005> get redis_key -> Redirected to slot [12262] located at 192.168.231.13:7003 "redis_value" 192.168.231.13:7003>
在redis集群里面我们可以连接到任何一个节点就可以访问所有redis的数据，这样，redis集群就是创建成功了