简单说下自己测试搭建简单的redis集群的大体步骤：
1.首先你的有6个redis（官方说最少6个，3master，3slave），可以先在一台机器上搭建，搭建到多台上应该只需要改变启动命令即可（可能需要一些ssh无密钥什么的，只是猜测）
在网上随便可以找到的配置多个redis，（总体有两种方式，一种是虚拟的，貌似走的都是一个redis，一种是将配置好的redis复制成六份，配置相应的端口等，我选择的后者显得更真实一些）
然后把他们全部打开，可以写一个脚本，或者一个一个打开，作为一个新世纪的年轻人，我当然选择一个一个打开它们......
[root@localhost ~]# ps -ef | grep redis root 3427 1 0 7月17 ? 00:02:59 src/redis-server *:6379 root 3454 1 0 7月17 ? 00:06:09 src/redis-server *:7001 [cluster] root 3460 1 0 7月17 ? 00:06:19 src/redis-server *:7002 [cluster] root 3467 1 0 7月17 ? 00:05:59 src/redis-server *:7003 [cluster] root 3473 1 0 7月17 ? 00:05:59 src/redis-server *:7004 [cluster] root 3477 1 0 7月17 ? 00:05:57 src/redis-server *:7005 [cluster] root 5867 1 0 12:02 ? 00:00:06 src/redis-server *:7000 [cluster] root 5938 5913 0 13:17 pts/1 00:00:00 grep --color=auto redis
2.将6个独立redis设置为集群，so easy 一句话搞定。其中 --replicas 参数是将6台redis分别分配了主从关系（master挂掉slave可以顶替，但是还没有具体深入研究）
./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
在开启过程中可能会遇到很多问题，各种奇怪的报错，那就要安装ruby和gem的一些东东，搞不明白是什么，反正就是依赖吧~ ，只能说按照这个来会绕开很多坑。
# yum install ruby-devel.x86_64 # wget http://rubygems.global.ssl.fastly.net/gems/redis-3.2.1.gem # gem install -l ./redis-3.2.1.gem
执行这些代码之后再去执行上面建立集群的命令，如果成功的话，会看到下面的样子：
>>> Creating cluster Connecting to node 127.0.0.1:7000: OK Connecting to node 127.0.0.1:7001: OK Connecting to node 127.0.0.1:7002: OK Connecting to node 127.0.0.1:7003: OK Connecting to node 127.0.0.1:7004: OK Connecting to node 127.0.0.1:7005: OK >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 Adding replica 127.0.0.1:7003 to 127.0.0.1:7000 Adding replica 127.0.0.1:7004 to 127.0.0.1:7001 Adding replica 127.0.0.1:7005 to 127.0.0.1:7002 M: ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a 127.0.0.1:7000 slots:0-5460 (5461 slots) master M: d3058a19483d7be5c30c042779e56130f6ebf074 127.0.0.1:7001 slots:5461-10922 (5462 slots) master M: 5814305e71552ab45c44b9b8233681a63c3a57b1 127.0.0.1:7002 slots:10923-16383 (5461 slots) master S: e50676757acbe7c6a21e8abf4eda26ababb08285 127.0.0.1:7003 replicates ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a S: ab307ba26d6dabe8edb2f2a7287be6f01aa46d88 127.0.0.1:7004 replicates d3058a19483d7be5c30c042779e56130f6ebf074 S: 11174332eb6ad40c0327750536fa776d706caf85 127.0.0.1:7005 replicates 5814305e71552ab45c44b9b8233681a63c3a57b1 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 127.0.0.1:7000) M: ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a 127.0.0.1:7000 slots:0-5460 (5461 slots) master M: d3058a19483d7be5c30c042779e56130f6ebf074 127.0.0.1:7001 slots:5461-10922 (5462 slots) master M: 5814305e71552ab45c44b9b8233681a63c3a57b1 127.0.0.1:7002 slots:10923-16383 (5461 slots) master M: e50676757acbe7c6a21e8abf4eda26ababb08285 127.0.0.1:7003 slots: (0 slots) master replicates ad52e4f7c14da4b8b1e8e48603c9e5515a4cec7a M: ab307ba26d6dabe8edb2f2a7287be6f01aa46d88 127.0.0.1:7004 slots: (0 slots) master replicates d3058a19483d7be5c30c042779e56130f6ebf074 M: 11174332eb6ad40c0327750536fa776d706caf85 127.0.0.1:7005 slots: (0 slots) master replicates 5814305e71552ab45c44b9b8233681a63c3a57b1 <span style="color:#009900;">[OK] All nodes agree about slots configuration.</span> >>> Check for open slots... >>> Check slots coverage... <span style="color:#009900;">[OK] All 16384 slots covered.</span></span>
3.测试集群。
可以用下面的命令查看集群的状态，从下面可以看出有4个master，2个slave~~~，这个是由于我太年轻kill了7000的redis又加入了进来，原先他的slave 7003 也变成了master顶替了他。
[root@localhost src]# ./redis-trib.rb check 127.0.0.1:7000 Connecting to node 127.0.0.1:7000: OK Connecting to node 127.0.0.1:7005: OK Connecting to node 127.0.0.1:7003: OK Connecting to node 127.0.0.1:7002: OK Connecting to node 127.0.0.1:7001: OK Connecting to node 127.0.0.1:7004: OK >>> Performing Cluster Check (using node 127.0.0.1:7000) M: 4eb95ab689288dbb3ebf7ed380a0593ec9daa878 127.0.0.1:7000 slots: (0 slots) master 0 additional replica(s) S: 11174332eb6ad40c0327750536fa776d706caf85 127.0.0.1:7005 slots: (0 slots) slave replicates 5814305e71552ab45c44b9b8233681a63c3a57b1 M: e50676757acbe7c6a21e8abf4eda26ababb08285 127.0.0.1:7003 slots:0-5460 (5461 slots) master 0 additional replica(s) M: 5814305e71552ab45c44b9b8233681a63c3a57b1 127.0.0.1:7002 slots:10923-16383 (5461 slots) master 1 additional replica(s) M: d3058a19483d7be5c30c042779e56130f6ebf074 127.0.0.1:7001 slots:5461-10922 (5462 slots) master 1 additional replica(s) S: ab307ba26d6dabe8edb2f2a7287be6f01aa46d88 127.0.0.1:7004 slots: (0 slots) slave replicates d3058a19483d7be5c30c042779e56130f6ebf074 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
可以进入redis中玩一玩：查了一下使用redis-cli命令的时候应该加上 -c ，意思是在集群模式下，否则你会以一种独立的redis进入，然后各种moved报错。
看着存储位置跳来跳去，貌似简单的集群也就搭建完成了。
[root@localhost src]# ./redis-cli -c -p 7000 127.0.0.1:7000> set qiang weikang -> Redirected to slot [1357] located at 127.0.0.1:7003 OK 127.0.0.1:7003> set qiang qiang OK 127.0.0.1:7003> set weikang qiang -> Redirected to slot [12142] located at 127.0.0.1:7002 OK 127.0.0.1:7002> get qiang -> Redirected to slot [1357] located at 127.0.0.1:7003 "qiang" 127.0.0.1:7003> get weikang -> Redirected to slot [12142] located at 127.0.0.1:7002 "qiang"