为了保证可以进行投票，需要至少3个主节点。每个主节点都需要至少一个从节点,所以需要至少3个从节点所以一共需要6台redis服务器，为了模拟6个redis节点，我们可以使用6个redis实例作为节点。6个redis实例的端口号,7001~7006.
首先在我们的linux中安装一个redis，如果不会的同学，可以去看我之前的博客《redis安装-单机版》然后：
1. 把bin目录里面的rdb,和aof文件删除,准备干净的redis
[root@localhost bin]# rm -rf appendonly.aof
[root@localhost bin]# rm -f dump.rdb
完事效果如下：
退出到上级目录，将bin复制6份
把bin复制6份
[root@localhost bin]# cd ..
如果没有redis-cluster文件夹的话需要创建一个
[root@localhost redis]# mkdir redis-cluster
[root@localhost redis]# cp -r bin redis-cluster/redis1
[root@localhost redis]# cp -r bin redis-cluster/redis2
[root@localhost redis]# cp -r bin redis-cluster/redis3
[root@localhost redis]# cp -r bin redis-cluster/redis4
[root@localhost redis]# cp -r bin redis-cluster/redis5
[root@localhost redis]# cp -r bin redis-cluster/redis6
这个时候，我们进入redis-cluster目录下看到的结果是这样的：
现在，为了让这6个redis节点运行的时候不起节点的冲突，我们需要修改它们的节点端口号。将端口号一次修改为7001~7006
首先打开第一个节点的redis.conf 配置文件：[root@itcast-01 redis-cluster]# vim redis1/redis.conf
将端口号修改为7001（将这的6379改为7001）
剩下的代码用同样的方法修改即可。
分别启动6个redis节点的服务，或者是写一个脚本，然后给脚本附上执行权限，然后用脚本启动也可以。
准备集群安装环境
redis集群的管理工具使用的是ruby脚本语言，安装集群需要ruby环境。
安装ruby环境[root@itcast-01 redis-cluster]# yum install ruby
安装Ruby的打包系统[root@itcast-01 redis-cluster]# yum install rubygems
下载一个redis-3.0.0.gem的文件，然后将文件上传，再执行命令安转。
[root@itcast-01 ~]# gem install redis-3.0.0.gem
安装集群
修改这6个实例的redis.conf配置文件,开启redis-cluster
[root@localhost redis-cluster]# vim redis1/redis.conf
然后再次重启实例
集群管理工具在redis解压文件夹的src的文件夹中，使用redis-cluster的集群管理工具启动集群
先进入集群管理工具所在的路径：[root@localhost redis-cluster]# cd /root/redis-3.0.0/src/
再启动命令：[root@localhost src]# ./redis-trib.rb create --replicas 1 192.168.37.161:7001 192.168.37.161:7002 192.168.37.161:7003 192.168.37.161:7004 192.168.37.161:7005 192.168.37.161:7006
此时的启动信息如下：
>>> Creating cluster Connecting to node 192.168.37.131:7001: OK Connecting to node 192.168.37.131:7002: OK Connecting to node 192.168.37.131:7003: OK Connecting to node 192.168.37.131:7004: OK Connecting to node 192.168.37.131:7005: OK Connecting to node 192.168.37.131:7006: OK >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 192.168.37.131:7001 192.168.37.131:7002 192.168.37.131:7003 Adding replica 192.168.37.131:7004 to 192.168.37.131:7001 Adding replica 192.168.37.131:7005 to 192.168.37.131:7002 Adding replica 192.168.37.131:7006 to 192.168.37.131:7003 M: 955567f988830cdf4328854f815719ea28082ca8 192.168.37.131:7001 slots:0-5460 (5461 slots) master M: 4f3eeced04b930aa48193699301745a05a70697a 192.168.37.131:7002 slots:5461-10922 (5462 slots) master M: 871a684dbbc0f43dcc16107710d7bd2f4e6de76a 192.168.37.131:7003 slots:10923-16383 (5461 slots) master S: baca3ce2223dfcd9c636a7193b12998b1dbb2431 192.168.37.131:7004 replicates 955567f988830cdf4328854f815719ea28082ca8 S: 0b599863ddf2e03b0326c75b874a1af8ae430d2e 192.168.37.131:7005 replicates 4f3eeced04b930aa48193699301745a05a70697a S: 92f712d954c62f2743e2e572f6582a6ef9a163e0 192.168.37.131:7006 replicates 871a684dbbc0f43dcc16107710d7bd2f4e6de76a Can I set the above configuration? (type 'yes' to accept):
>>> Creating cluster Connecting to node 192.168.37.131:7001: OK Connecting to node 192.168.37.131:7002: OK Connecting to node 192.168.37.131:7003: OK Connecting to node 192.168.37.131:7004: OK Connecting to node 192.168.37.131:7005: OK Connecting to node 192.168.37.131:7006: OK >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 192.168.37.131:7001 192.168.37.131:7002 192.168.37.131:7003 Adding replica 192.168.37.131:7004 to 192.168.37.131:7001 Adding replica 192.168.37.131:7005 to 192.168.37.131:7002 Adding replica 192.168.37.131:7006 to 192.168.37.131:7003 M: 955567f988830cdf4328854f815719ea28082ca8 192.168.37.131:7001 slots:0-5460 (5461 slots) master M: 4f3eeced04b930aa48193699301745a05a70697a 192.168.37.131:7002 slots:5461-10922 (5462 slots) master M: 871a684dbbc0f43dcc16107710d7bd2f4e6de76a 192.168.37.131:7003 slots:10923-16383 (5461 slots) master S: baca3ce2223dfcd9c636a7193b12998b1dbb2431 192.168.37.131:7004 replicates 955567f988830cdf4328854f815719ea28082ca8 S: 0b599863ddf2e03b0326c75b874a1af8ae430d2e 192.168.37.131:7005 replicates 4f3eeced04b930aa48193699301745a05a70697a S: 92f712d954c62f2743e2e572f6582a6ef9a163e0 192.168.37.131:7006 replicates 871a684dbbc0f43dcc16107710d7bd2f4e6de76a Can I set the above configuration? (type 'yes' to accept):
输入yes，然后回车，又是一大堆的提示信息：
>>> 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 192.168.37.131:7001) M: 955567f988830cdf4328854f815719ea28082ca8 192.168.37.131:7001 slots:0-5460 (5461 slots) master M: 4f3eeced04b930aa48193699301745a05a70697a 192.168.37.131:7002 slots:5461-10922 (5462 slots) master M: 871a684dbbc0f43dcc16107710d7bd2f4e6de76a 192.168.37.131:7003 slots:10923-16383 (5461 slots) master M: baca3ce2223dfcd9c636a7193b12998b1dbb2431 192.168.37.131:7004 slots: (0 slots) master replicates 955567f988830cdf4328854f815719ea28082ca8 M: 0b599863ddf2e03b0326c75b874a1af8ae430d2e 192.168.37.131:7005 slots: (0 slots) master replicates 4f3eeced04b930aa48193699301745a05a70697a M: 92f712d954c62f2743e2e572f6582a6ef9a163e0 192.168.37.131:7006 slots: (0 slots) master replicates 871a684dbbc0f43dcc16107710d7bd2f4e6de76a [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
这时，我们的集群就算是安装成功了。
测试
使用redis命令行客户端连接
[root@localhost bin]# ./redis-cli -h 192.168.37.131 -p 7006 -c
192.168.37.131:7006> set hello money
-> Redirected to slot [866] located at 192.168.37.131:7001
OK
一定要加-c参数,节点之间就可以互相跳转
这就表示我们的集群搭建成功了，而且，自动将访问7001端口的那个请求跳转到7006.并且保存成功。