Redis 集群是一个提供在多个Redis间节点间共享数据的程序集.redis3.0以前，只支持主从同步的，如果主的挂了，写入就成问题了。3.0出来后就可以很好帮我们解决这个问题。
目前redis 3.0还不稳定，如果要用在生产环境中，要慎重。

一，redis服务器说明

192.168.10.219 6379  
192.168.10.219 6380  
192.168.10.219 6381  
  
192.168.10.220 6382  
192.168.10.220 6383  
192.168.10.220 6384  
要让集群正常运作至少需要三个主节点，不过在刚开始试用集群功能时， 强烈建议使用六个节点： 其中三个为主节点， 而其余三个则是各个主节点的从节点。所有用二台机器，开6个redis进程，模拟6台机器。

二，安装ruby,rubygems
   
# yum -y install gcc openssl-devel libyaml-devel libffi-devel readline-devel zlib-devel gdbm-devel ncurses-devel gcc-c++ automake autoconf  
  
# yum -y install ruby rubygems   //安装ruby rubygems  
  
//换源  
# gem source -l  
# gem source --remove http://rubygems.org/  
# gem sources -a http://ruby.taobao.org/  
# gem source -l  
  
# gem install redis --version 3.0.0  //安装gem_redis  
Successfully installed redis-3.0.0  
1 gem installed  
Installing ri documentation for redis-3.0.0...  
Installing RDoc documentation for redis-3.0.0...  
以前写过一篇ruby on rails的文章，请参考：centos ruby on rails apache mysql 安装配置详解
喜欢手动编译的人，可以参考这篇文章，安装ruby.

三，安装redis3.0.0

1，安装redis
   
# wget http://download.redis.io/releases/redis-3.0.0.tar.gz  
# tar -xvzf redis-3.0.0.tar.gz  
# cd redis-3.0.0  
# make && make install  
# cd src  
# cp redis-trib.rb /usr/local/bin    
  
# mkdir /etc/redis  
# mkdir /var/log/redis  
上述操作要先在二台机器上面都操作好。

2,配置redis
   
[root@slave2 redis-3.0.0]#  vim redis.conf   //解压的根目录，有redis.conf,做以下修改  
port 6379  
pidfile /var/run/redis-6379.pid  
dbfilename dump-6379.rdb  
appendfilename "appendonly-6379.aof"  
cluster-config-file nodes-6379.conf  
cluster-enabled yes  
cluster-node-timeout 5000  
appendonly yes

3，copy配置文件，并修改端口
   
# cp redis.conf /etc/redis/redis-6379.conf  
# cp redis.conf /etc/redis/redis-6380.conf  
# cp redis.conf /etc/redis/redis-6381.conf  
  
# scp redis.conf 192.168.10.220:/etc/redis/redis-6382.conf  
# scp redis.conf 192.168.10.220:/etc/redis/redis-6383.conf  
# scp redis.conf 192.168.10.220:/etc/redis/redis-6384.conf  
  
# sed -i "s/6379/6380/g" /etc/redis/redis-6380.conf  
# sed -i "s/6379/6381/g" /etc/redis/redis-6381.conf  
  
# sed -i "s/6379/6382/g" /etc/redis/redis-6382.conf  
# sed -i "s/6379/6383/g" /etc/redis/redis-6383.conf  
# sed -i "s/6379/6384/g" /etc/redis/redis-6384.conf  
将配置文件分别copy到二台机器上，并替换端口：
   
# cat redis-6380.conf |awk '{if($0 !~ /^$/ && $0 !~ /#/) {print $0}}' |grep 6380  
pidfile /var/run/redis-6380.pid  
port 6380  
dbfilename dump-6380.rdb  
appendfilename "appendonly-6380.aof"  
cluster-config-file nodes-6380.conf  
有5处修改端口的地方

4，启动并查看redis
   
# redis-server /etc/redis/redis-6379.conf > /var/log/redis/redis-6379.log 2>&1 &  
# redis-server /etc/redis/redis-6380.conf > /var/log/redis/redis-6380.log 2>&1 &  
# redis-server /etc/redis/redis-6381.conf > /var/log/redis/redis-6381.log 2>&1 &  
  
# redis-server /etc/redis/redis-6382.conf > /var/log/redis/redis-6382.log 2>&1 &  
# redis-server /etc/redis/redis-6383.conf > /var/log/redis/redis-6383.log 2>&1 &  
# redis-server /etc/redis/redis-6384.conf > /var/log/redis/redis-6384.log 2>&1 &  
  
# netstat -tpnl |grep redis  
tcp        0      0 0.0.0.0:6379                0.0.0.0:*                   LISTEN      7298/redis-server *  
tcp        0      0 0.0.0.0:6380                0.0.0.0:*                   LISTEN      7299/redis-server *  
tcp        0      0 0.0.0.0:6381                0.0.0.0:*                   LISTEN      7304/redis-server *  
tcp        0      0 0.0.0.0:16379               0.0.0.0:*                   LISTEN      7298/redis-server *  
tcp        0      0 0.0.0.0:16380               0.0.0.0:*                   LISTEN      7299/redis-server *  
tcp        0      0 0.0.0.0:16381               0.0.0.0:*                   LISTEN      7304/redis-server *  
tcp        0      0 :::6379                     :::*                        LISTEN      7298/redis-server *  
tcp        0      0 :::6380                     :::*                        LISTEN      7299/redis-server *  
tcp        0      0 :::6381                     :::*                        LISTEN      7304/redis-server *  
tcp        0      0 :::16379                    :::*                        LISTEN      7298/redis-server *  
tcp        0      0 :::16380                    :::*                        LISTEN      7299/redis-server *  
tcp        0      0 :::16381                    :::*                        LISTEN      7304/redis-server *  
  
[root@slave2 redis]# ll /etc/redis/

总用量 156

-rw-r--r-- 1 root root     0 4月  30 23:54 appendonly-6379.aof  
-rw-r--r-- 1 root root     0 5月   1 00:08 appendonly-6380.aof  
-rw-r--r-- 1 root root     0 5月   1 00:08 appendonly-6381.aof  
-rw-r--r-- 1 root root    18 5月   1 00:08 dump-6379.rdb  
-rw-r--r-- 1 root root    18 5月   1 00:08 dump-6380.rdb  
-rw-r--r-- 1 root root    18 5月   1 00:08 dump-6381.rdb  
-rw-r--r-- 1 root root   763 5月   1 00:08 nodes-6379.conf  
-rw-r--r-- 1 root root   763 5月   1 00:08 nodes-6380.conf  
-rw-r--r-- 1 root root   763 5月   1 00:08 nodes-6381.conf  
-rw-r--r-- 1 root root 41412 4月  30 23:30 redis-6379.conf  
-rw-r--r-- 1 root root 41412 4月  30 23:39 redis-6380.conf  
-rw-r--r-- 1 root root 41412 4月  30 23:39 redis-6381.conf

所有节点都启动成功，并不代表，他们就是集群了。

四，创建集群，并查看

1，创建redis集群

# redis-trib.rb create --replicas 1 192.168.10.219:6379 192.168.10.219:6380 192.168.10.219:6381 192.168.10.220:6382 192.168.10.220:6383 192.168.10.220:6384  
2，查看redis集群状态
   
[root@slave2 redis]# redis-trib.rb check 192.168.10.219:6379  
Connecting to node 192.168.10.219:6379: OK  
Connecting to node 192.168.10.220:6384: OK  
Connecting to node 192.168.10.219:6381: OK  
Connecting to node 192.168.10.220:6383: OK  
Connecting to node 192.168.10.220:6382: OK  
Connecting to node 192.168.10.219:6380: OK  
>>> Performing Cluster Check (using node 192.168.10.219:6379)  
M: d40d9a367c24784b0336c7b80fb4c87337e2cba6 192.168.10.219:6379  
 slots:5461-10922 (5462 slots) master  
 1 additional replica(s)  
S: 5f00f163d0c0a540ea99daf004f55588a802327b 192.168.10.220:6384  
 slots: (0 slots) slave  
 replicates d40d9a367c24784b0336c7b80fb4c87337e2cba6  
S: b3b1a848987b5a87a06888e126d5c9b16f871ff5 192.168.10.219:6381  
 slots: (0 slots) slave  
 replicates d2eb5a8a77f87888792428aed4692dfb907e7a1d  
M: d2eb5a8a77f87888792428aed4692dfb907e7a1d 192.168.10.220:6383  
 slots:10923-16383 (5461 slots) master  
 1 additional replica(s)  
M: a8eafe8b19d6a28c034917da13a43ce1230fe870 192.168.10.220:6382  
 slots:0-5460 (5461 slots) master  
 1 additional replica(s)  
S: a87d207204a53ab599bf7f6ffb9d679d0eef4f25 192.168.10.219:6380  
 slots: (0 slots) slave  
 replicates a8eafe8b19d6a28c034917da13a43ce1230fe870  
[OK] All nodes agree about slots configuration.  
>>> Check for open slots...  
>>> Check slots coverage...  
[OK] All 16384 slots covered.

到这儿，redis集群就配置成功了

五，测试redis集群
   
# redis-cli -c -p 6379 -h 192.168.10.219   //在219登录  
192.168.10.219:6379> set tank tank1    //设置测试值  
-> Redirected to slot [4407] located at 192.168.10.220:6382  
OK   //直接转向到220 6382端口，数据存到了220 6382，不过有点奇怪  
192.168.10.220:6382> get tank   //可以取到值  
"tank1"  
  
[root@manage redis]# redis-cli -c -p 6383 -h 192.168.10.220  //220机器，6383端口  
192.168.10.220:6383> get tank  
-> Redirected to slot [4407] located at 192.168.10.220:6382  //直接转向220 6382端口  
"tank1"  
  
[root@manage redis]# ps aux |grep redis //查看进程  
root      7310  0.2  0.9 137436  9724 pts/0    Sl   Apr30   0:09 redis-server *:6382 [cluster]  
root      7311  0.2  0.9 137436  9776 pts/0    Sl   Apr30   0:09 redis-server *:6383 [cluster]  
root      7316  0.2  0.9 137436  9944 pts/0    Sl   Apr30   0:10 redis-server *:6384 [cluster]  
root      7478  0.0  0.0 103256   812 pts/0    S+   00:56   0:00 grep redis  
  
[root@manage redis]# kill -9 7310  //关闭220 6382端口，看数据会不会丢失  
  
[root@slave2 redis]# redis-trib.rb check 192.168.10.219:6379  //查看集群情况，任何接口都行  
Connecting to node 192.168.10.219:6379: OK  
Connecting to node 192.168.10.220:6384: OK  
Connecting to node 192.168.10.219:6381: OK  
Connecting to node 192.168.10.220:6383: OK  
Connecting to node 192.168.10.219:6380: OK  
>>> Performing Cluster Check (using node 192.168.10.219:6379)  
M: d40d9a367c24784b0336c7b80fb4c87337e2cba6 192.168.10.219:6379  
 slots:5461-10922 (5462 slots) master  
 1 additional replica(s)  
S: 5f00f163d0c0a540ea99daf004f55588a802327b 192.168.10.220:6384  
 slots: (0 slots) slave  
 replicates d40d9a367c24784b0336c7b80fb4c87337e2cba6  
S: b3b1a848987b5a87a06888e126d5c9b16f871ff5 192.168.10.219:6381  
 slots: (0 slots) slave  
 replicates d2eb5a8a77f87888792428aed4692dfb907e7a1d  
M: d2eb5a8a77f87888792428aed4692dfb907e7a1d 192.168.10.220:6383  
 slots:10923-16383 (5461 slots) master  
 1 additional replica(s)  
M: a87d207204a53ab599bf7f6ffb9d679d0eef4f25 192.168.10.219:6380  
 slots:0-5460 (5461 slots) master  
 0 additional replica(s)  
[OK] All nodes agree about slots configuration.  
>>> Check for open slots...  
>>> Check slots coverage...  
[OK] All 16384 slots covered.  //变成，三主二从了  
  
[root@slave2 redis]# redis-cli -c -p 6379 -h 192.168.10.219    //219登录  
192.168.10.219:6379> get tank  
-> Redirected to slot [4407] located at 192.168.10.219:6380   //数据被转到了6380节点了  
"tank1"  
经测试，集群是可用的。