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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
192.168.120.45 7000
192.168.120.45 7001
192.168.120.45 7002
192.168.120.46 7003
192.168.120.46 7004
192.168.120.46 7005
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。所以用二台机器，开6个redis进程，模拟6台机器。
二，安装redis
1.将压缩包复制到/usr/local/目录下
2.解压缩并安装redis
[/usr/local/] #tar -xvzf redis-3.0.5.tar.gz
[/usr/local/] #cd redis-3.0.5
[/usr/local/redis-3.0.5]#make
[/usr/local/redis-3.0.5]#make install
[/usr/local/redis-3.0.5]#cd src
[/usr/local/redis-3.0.5]#cp redis-trib.rb /usr/local/bin
3.创建redis集群配置文件
#mkdir /etc/redis
#mkdi /var/log/redis
(2,3需要在两台服务上执行)
4.配置redis
[/usr/local/redis-3.0.5]#vim redis.conf
修改内容：
port 7000
pidfile /var/run/redis-7000.pid
dbfilename dump-7000.rdb
appendfilename "appendonly-7000.aof"
cluster-config-file nodes-7000.conf
cluster-enabledyes
cluster-node-timeout 5000
appendonly yes
5.copy配置文件，并修改端口
# cp redis.conf /etc/redis/redis-7000.conf
# cp redis.conf /etc/redis/redis-7001.conf
# cp redis.conf /etc/redis/redis-7002.conf
# scp redis.conf 192.168.120.46:/etc/redis/redis-7003.conf
# scp redis.conf 192.168.120.46:/etc/redis/redis-7004.conf
# scp redis.conf 192.168.120.46:/etc/redis/redis-7005.conf
//将redis-7001.conf文件中的所有7000替换为7001
# sed -i "s/7000/7001/g" /etc/redis/redis-7001.conf
# sed -i "s/7000/7002/g" /etc/redis/redis-7002.conf
# sed -i "s/7000/7003/g" /etc/redis/redis-7003.conf
# sed -i "s/7000/7004/g" /etc/redis/redis-7004.conf
# sed -i "s/7000/7005/g" /etc/redis/redis-7005.conf
三，启动redis并查看redis
#./redis-server /etc/redis/redis-7000.conf > /var/log/redis/redis-7000.log 2>&1 &
# ./redis-server /etc/redis/redis-7001.conf > /var/log/redis/redis-7001.log 2>&1 &
# ./redis-server /etc/redis/redis-7002.conf > /var/log/redis/redis-7002.log 2>&1 &
# ./redis-server /etc/redis/redis-7003.conf > /var/log/redis/redis-7003.log 2>&1 &
# ./redis-server /etc/redis/redis-7004.conf > /var/log/redis/redis-7004.log 2>&1 &
# ./redis-server /etc/redis/redis-7005.conf > /var/log/redis/redis-7005.log 2>&1 &
# netstat -tpnl |grep redis
tcp 0 0 192.168.120.45:17000 0.0.0.0:* LISTEN 15658/./redis-serve
tcp 0 0 192.168.120.45:17001 0.0.0.0:* LISTEN 15652/./redis-serve
tcp 0 0 192.168.120.45:17002 0.0.0.0:* LISTEN 15644/./redis-serve
tcp 0 0 192.168.120.45:7000 0.0.0.0:* LISTEN 15658/./redis-serve
tcp 0 0 192.168.120.45:7001 0.0.0.0:* LISTEN 15652/./redis-serve
tcp 0 0 192.168.120.45:7002 0.0.0.0:* LISTEN 15644/./redis-serve
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 1 192.168.120.45:7000 192.168.120.45:7001 192.168.120.45:7002 192.168.120.46:7003 192.168.120.46:7004 192.168.120.46:7005
命令的意义如下：
给定 redis-trib.rb 程序的命令是 create ， 这表示我们希望创建一个新的集群。
选项 --replicas 1 表示我们希望为集群中的每个主节点创建一个从节点。
之后跟着的其他参数则是实例的地址列表， 我们希望程序使用这些地址所指示的实例来创建新集群。
简单来说， 以上命令的意思就是让 redis-trib 程序创建一个包含三个主节点和三个从节点的集群。
2.查看redis集群状态
#redis-trib.rb check 192.168.120.45:7000
Connecting to node 192.168.120.45:7000: OK
Connecting to node 192.168.120.46:7005: OK
Connecting to node 192.168.120.46:7004: OK
Connecting to node 192.168.120.46:7003: OK
Connecting to node 192.168.120.45:7001: OK
Connecting to node 192.168.120.45:7002: OK
>>> Performing Cluster Check (using node 192.168.120.45:7000)
M: f84ca7b52e70e179e82b56120db72b828a5a60a4 192.168.120.45:7000
slots:5461-6917,6919-10922 (5461 slots) master
1 additional replica(s)
S: 87eb060b519c5ca21cad4229b6bab4fa685c134c 192.168.120.46:7005
slots: (0 slots) slave
replicates f84ca7b52e70e179e82b56120db72b828a5a60a4
M: c9f204b2f1b82de04a0cac045164ee1d64ab8b54 192.168.120.46:7004
slots:10923-16383 (5461 slots) master
0 additional replica(s)
M: c18ab6cf7fd53ccbb7a4c38a385df4db8e22531d 192.168.120.46:7003
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 5e502340bea055417e76985c4cc6355a66263a5b 192.168.120.45:7001
slots: (0 slots) slave
replicates c18ab6cf7fd53ccbb7a4c38a385df4db8e22531d
M: 13bbd4a90fef751a57247f92d44e3dc4db6b99ab 192.168.120.45:7002
slots:6918 (1 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.
到这儿，redis集群就配置成功了
五，测试redis集群
# ./redis-cli -c -p
7001 -h 192.168.120.45 //在45登录
192.168.120.45:7001> set tank tank1 //设置测试值
-> Redirected to slot [4407] located at 192.168.120.45:7000
OK //直接转向到45 7000端口，数据存到了45 7000，不过有点奇怪
192.168.120.45:7001> get tank //可以取到值
"tank1"
[root@manage redis]# redis-cli -c -p 7005 -h 192.168.120.46 //46机器，7005端口
192.168.120.46:7005> get tank
-> Redirected to slot [4407] located at 192.168.120.46:7004 //直接转向46 7004端口
"tank1"
[root@manage redis]# ps aux |grep redis //查看进程
root 2838 0.0 0.0 105048 3344 pts/2 T 14:18 0:00 vim redis.conf
root 2870 0.0 0.0 105048 3312 pts/2 T 14:25 0:00 vim /etc/redis/redis-7004.conf
root 2977 0.0 0.0 95388 2644 ? Ssl 14:58 0:01 ./redis-server 192.168.120.46:7003 [cluster]
root 2983 0.0 0.0 95388 2572 ? Ssl 14:58 0:01 ./redis-server 192.168.120.46:7004 [cluster]
root 2987 0.0 0.0 95388 2628 ? Ssl 14:58 0:01 ./redis-server 192.168.120.46:7005 [cluster]
root 3289 0.0 0.0 63412 780 pts/2 R+ 16:48 0:00 grep redis
[root@manage redis]# kill -9 2983 //关闭46 7004端口，看数据会不会丢失
[root@slave2 redis]# redis-trib.rb check 192.168.120.45:7000 //查看集群情况，任何接口都行
Connecting to node 192.168.120.45:7000: OK
Connecting to node 192.168.120.46:7005: OK
Connecting to node 192.168.120.46:7003: OK
Connecting to node 192.168.120.45:7001: OK
Connecting to node 192.168.120.45:7002: OK
>>> Performing Cluster Check (using node 192.168.120.45:7000)
M: f84ca7b52e70e179e82b56120db72b828a5a60a4 192.168.120.45:7000
slots:5461-6917,6919-10922 (5461 slots) master
1 additional replica(s)
S: 87eb060b519c5ca21cad4229b6bab4fa685c134c 192.168.120.46:7005
slots: (0 slots) slave
replicates f84ca7b52e70e179e82b56120db72b828a5a60a4
M: c18ab6cf7fd53ccbb7a4c38a385df4db8e22531d 192.168.120.46:7003
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: 5e502340bea055417e76985c4cc6355a66263a5b 192.168.120.45:7001
slots: (0 slots) slave
replicates c18ab6cf7fd53ccbb7a4c38a385df4db8e22531d
M: 13bbd4a90fef751a57247f92d44e3dc4db6b99ab 192.168.120.45:7002
slots:6918 (1 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
192.168.120.45:7002> get tank
-> Redirected to slot [4407] located at 192.168.120.46:7003 //数据被转到了7003节点了
"tank1"
经测试，集群是可用的。
redis集群安装
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原文地址：http://www.cnblogs.com/Ycc9/p/5286625.html
