第一步：安装Redis
前面已经安装过了 不解释，
Reids安装包里有个集群工具，要复制到/usr/local/bin里去
cp redis-3.2.9/src/redis-trib.rb /usr/local/bin
第二步：修改配置，创建节点
我们现在要搞六个节点，三主三从，
端口规定分别是7001，7002，7003，7004，7005，7006
我们先在root目录下新建一个redis_cluster目录，然后该目录下再创建6个目录，
分别是7001，7002，7003，7004，7005，7006，用来存在redis配置文件；
这里我们要使用redis集群，要先修改redis的配置文件redis.conf
mkdir redis_cluster 新建目录
[root@localhost ~]# cd redis_cluster/
[root@localhost redis_cluster]# mkdir 7001 7002 7003 7004 7005 7006
[root@localhost redis_cluster]# ll
总用量 0
drwxr-xr-x. 2 root root 6 7月 27 17:18 7001
drwxr-xr-x. 2 root root 6 7月 27 17:18 7002
drwxr-xr-x. 2 root root 6 7月 27 17:18 7003
drwxr-xr-x. 2 root root 6 7月 27 17:18 7004
drwxr-xr-x. 2 root root 6 7月 27 17:18 7005
drwxr-xr-x. 2 root root 6 7月 27 17:18 7006
[root@localhost redis_cluster]#
先复制一份配置文件到7001目录下
[root@localhost redis_cluster]# cd
[root@localhost ~]# cp redis-3.2.9/redis.conf redis_cluster/7001/
我们修改下这个配置文件
vi redis_cluster/7001/redis.conf
修改一下几个
port 7001 //六个节点配置文件分别是7001-7006
daemonize yes //redis后台运行
pidfile /var/run/redis_7001.pid //pidfile文件对应7001-7006
cluster-enabled yes //开启集群
cluster-config-file nodes_7001.conf //保存节点配置，自动创建，自动更新对应7001-7006
cluster-node-timeout 5000 //集群超时时间，节点超过这个时间没反应就断定是宕机
appendonly yes //存储方式，aof，将写操作记录保存到日志中
7001下的修改完后，我们把7001下的配置分别复制到7002-7006 然后对应的再修改下配置即可；
[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7002/
[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7003/
[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7004/
[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7005/
[root@localhost ~]# cp redis_cluster/7001/redis.conf redis_cluster/7006/
[root@localhost ~]# vi redis_cluster/7002/redis.conf
[root@localhost ~]# vi redis_cluster/7003/redis.conf
[root@localhost ~]# vi redis_cluster/7004/redis.conf
[root@localhost ~]# vi redis_cluster/7005/redis.conf
[root@localhost ~]# vi redis_cluster/7006/redis.conf
编辑后面5个配置文件，把 port ，pidfile，cluster-config-file 分别修改下即可；
第三步：启动六个节点的redis
[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7001/redis.conf
[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7002/redis.conf
[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7003/redis.conf
[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7004/redis.conf
[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7005/redis.conf
[root@localhost ~]# /usr/local/redis/bin/redis-server redis_cluster/7006/redis.conf
启动六个节点
[root@localhost ~]# ps -ef | grep redis
查找下redis进程
root 9501 1 0 17:38 ? 00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]
root 9512 1 0 17:45 ? 00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7002 [cluster]
root 9516 1 0 17:45 ? 00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]
root 9520 1 0 17:45 ? 00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]
root 9524 1 0 17:45 ? 00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]
root 9528 1 0 17:45 ? 00:00:00 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]
说明都启动成功了
第四步：创建集群
redis官方提供了redis-trib.rb工具，第一步里已经房到里bin下 ；
但是在使用之前 需要安装ruby，以及redis和ruby连接
yum -y install ruby ruby-devel rubygems rpm-build
gem install redis
redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006
创建集群
[root@localhost ~]# redis-trib.rb create --replicas 1 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006
>>> Creating cluster
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7001
127.0.0.1:7002
127.0.0.1:7003
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
Adding replica 127.0.0.1:7006 to 127.0.0.1:7003
M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001
slots:0-5460 (5461 slots) master
M: d61e66e49e669b99d801f22f6461172696fdd1c9 127.0.0.1:7002
slots:5461-10922 (5462 slots) master
M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003
slots:10923-16383 (5461 slots) master
S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004
replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c
S: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005
replicates d61e66e49e669b99d801f22f6461172696fdd1c9
S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006
replicates aa6bc3f1e1174c3a991c01882584707c2408ec18
Can I set the above configuration? (type 'yes' to accept):
从运行结果看 主节点就是7001 7002 7003 从节点分别是7004 7005 7006
7001分配到的哈希槽是 0-5460
7002分配到的哈希槽是 5461-10922
7003分配到的哈希槽是 10923-16383
最后问我们是否接受上面的设置，输入yes 就表示接受，我们输入yes
然后显示：
>>> 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 127.0.0.1:7001)
M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006
slots: (0 slots) slave
replicates aa6bc3f1e1174c3a991c01882584707c2408ec18
M: d61e66e49e669b99d801f22f6461172696fdd1c9 127.0.0.1:7002
slots:5461-10922 (5462 slots) master
1 additional replica(s)
S: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005
slots: (0 slots) slave
replicates d61e66e49e669b99d801f22f6461172696fdd1c9
M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004
slots: (0 slots) slave
replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
显示配置哈希槽，以及集群创建成功，可以用了；
第五步：集群数据测试
我们先连接任意一个节点，然后添加一个key：
redis-cli是redis默认的客户端工具，启动时加上｀-c｀参数，`-p`指定端口，就可以连接到集群。
连接任意一个节点端口：
[root@localhost ~]# /usr/local/redis/bin/redis-cli -c -p 7002
127.0.0.1:7002>
我们连接7002
127.0.0.1:7002> set xxx 'fdafda'
-> Redirected to slot [4038] located at 127.0.0.1:7001
OK
前面说过Redis Cluster值分配规则，所以分配key的时候，它会使用CRC16(‘my_name’)%16384算法，来计算，将这个key 放到哪个节点，这里分配到了4038slot 就分配到了7001(0-5460)这个节点上。所以有：
Redirected to slot [4038] located at 127.0.0.1:7001
我们从其他集群节点 ，都可以获取到数据
127.0.0.1:7001> exit
[root@localhost ~]# /usr/local/redis/bin/redis-cli -c -p 7005
127.0.0.1:7005> get xxx
-> Redirected to slot [4038] located at 127.0.0.1:7001
"fdafda"
127.0.0.1:7001>
第六步：集群宕机测试
假如我们干掉一个节点，比如7002 这个主节点
[root@localhost ~]# ps -ef | grep redis
root 9501 1 0 17:38 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]
root 9512 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7002 [cluster]
root 9516 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]
root 9520 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]
root 9524 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]
root 9528 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]
root 9601 2186 0 18:12 pts/0 00:00:00 grep --color=auto redis
[root@localhost ~]# kill -9 9512
[root@localhost ~]# ps -ef | grep redis
root 9501 1 0 17:38 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]
root 9516 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]
root 9520 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]
root 9524 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7005 [cluster]
root 9528 1 0 17:45 ? 00:00:01 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]
root 9603 2186 0 18:12 pts/0 00:00:00 grep --color=auto redis
[root@localhost ~]#
然后再来看下集群的情况
redis-trib.rb check 127.0.0.1:7001
>>> Performing Cluster Check (using node 127.0.0.1:7001)
M: bfcfcdc304b011023fa568e044ea23ea6bc03c3c 127.0.0.1:7001
slots:0-5460 (5461 slots) master
1 additional replica(s)
S: f25b35f208dc96605ee4660994d2ac52f39ac870 127.0.0.1:7006
slots: (0 slots) slave
replicates aa6bc3f1e1174c3a991c01882584707c2408ec18
M: 1d2341fd3b79ef0fccb8e3a052bba141337c6cdd 127.0.0.1:7005
slots:5461-10922 (5462 slots) master
0 additional replica(s)
M: aa6bc3f1e1174c3a991c01882584707c2408ec18 127.0.0.1:7003
slots:10923-16383 (5461 slots) master
1 additional replica(s)
S: 7908a60306333c5d7c7c5e7ffef44bdf947ef0a4 127.0.0.1:7004
slots: (0 slots) slave
replicates bfcfcdc304b011023fa568e044ea23ea6bc03c3c
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
我们发现 7005本来是从节点，由于他对应的主节点挂了，就自动变成主节点master，所有会有最后一个说明
All 16384 slots covered. 所有哈希槽都可覆盖了； 集群可以正常使用；
假如我们把7005也干掉，试试看
[root@localhost ~]# kill -9 9524
[root@localhost ~]# ps -ef | grep redis
root 9501 1 0 17:38 ? 00:00:03 /usr/local/redis/bin/redis-server 127.0.0.1:7001 [cluster]
root 9516 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7003 [cluster]
root 9520 1 0 17:45 ? 00:00:03 /usr/local/redis/bin/redis-server 127.0.0.1:7004 [cluster]
root 9528 1 0 17:45 ? 00:00:02 /usr/local/redis/bin/redis-server 127.0.0.1:7006 [cluster]
root 9610 2186 0 18:16 pts/0 00:00:00 grep --color=auto redis
[root@localhost ~]#
查看下集群情况
redis-trib.rb check 127.0.0.1:7001
这里我们发现 出事了，因为主从节点都挂了 所以有一部分哈希槽没得分配，最后一句
[ERR] Not all 16384 slots are covered by nodes. 没有安全覆盖；
所以不能正常使用集群；