#如下图：三个redis服务+三个哨兵监控 全部启动成功
[root@mail ~]# ps aux|grep redis   
root      50845  0.0  0.1 158068  3904 ?        Ssl  07:50   0:42 redis-server 0.0.0.0:6379                               
root      50166  0.0  0.1 161652  3768 ?        Ssl  07:39   0:43 redis-server 0.0.0.0:7001                    
root      50173  0.1  0.2 161652  4884 ?        Ssl  07:40   0:53 redis-server 0.0.0.0:7002                    
root      50370  0.1  0.1 152436  3692 ?        Ssl  07:43   1:14 redis-sentinel *:26379 [sentinel]                          
root      50375  0.1  0.0 152436  1748 ?        Ssl  07:43   1:15 redis-sentinel *:27001 [sentinel]                          
root      50431  0.1  0.0 152436  1712 ?        Ssl  07:43   1:14 redis-sentinel *:27002 [sentinel]                          

六、测试：数据同步+读写分离+故障转移

1、数据同步测试

测试目标：master主节点 写入/修改/删除数据，slave从节点会自动同步master的数据操作记录。

① redis-cli链接master主节点，写入age和name 两个数据

#链接redis,设置两个值，如下
[root@mail ~]# redis-cli -a 123456 -p 6379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> set age 25
OK
127.0.0.1:6379> set name lex
OK

#登录slave从节点
[root@mail ~]# redis-cli -a 123456 -p 7001
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

#查看所有数据
127.0.0.1:7001> keys *
1) "age"
2) "name"

#查看age数据
127.0.0.1:7001> get age
"25"

#尝试修改数据
127.0.0.1:7001> set age 30
(error) READONLY You can't write against a read only replica.
#修改失败，slave从节点 数据只读

#链接哨兵sentinel 同样使用redis-cli
[root@mail ~]# redis-cli -a 123456 -p 26379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
#查看mymaster（我们配置的集群名）  集群的master 是哪个
127.0.0.1:26379> sentinel master mymaster
 1) "name"
 2) "mymaster"
 3) "ip"
 4) "192.168.154.145"
 5) "port"
 6) "6379"
 7) "runid"
 8) "105cc1c986fcda65ad4ddba69012e8e6e0073e1f"
 9) "flags"
10) "master"
...

#命令如下：
127.0.0.1:26379> sentinel slaves mymaster
1)  1) "name"
    2) "192.168.154.145:7001"
    3) "ip"
    4) "192.168.154.145"
    5) "port"
    6) "7001"
    9) "flags"
   10) "slave"
   31) "master-link-status"
   32) "ok"
   33) "master-host"
   34) "192.168.154.145"
   35) "master-port"
   36) "6379"
...

2)  1) "name"
    2) "192.168.154.145:7002"
    3) "ip"
    4) "192.168.154.145"
    5) "port"
    6) "7002"
    9) "flags"
   10) "slave"
   31) "master-link-status"
   32) "ok"
   33) "master-host"
   34) "192.168.154.145"
   35) "master-port"
   36) "6379"
...

#链接主节点，shutdown关闭主节点
[root@mail ~]# redis-cli -a 123456 -p 6379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> shutdown
not connected> 

#链接到哨兵，查看主节点：主节点变为 7002
[root@mail ~]# redis-cli -a 123456 -p 26379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:26379> sentinel master mymaster
 1) "name"
 2) "mymaster"
 3) "ip"
 4) "192.168.154.145"
 5) "port"
 6) "7002"
 7) "runid"
 8) "105cc1c986fcda65ad4ddba69012e8e6e0073e1f"
 9) "flags"
10) "master"
...
127.0.0.1:26379> 

[root@mail ~]# redis-cli -a 123456 -p 26379
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:26379> sentinel slaves mymaster
1)  1) "name"
    2) "192.168.154.145:6379"
    3) "ip"
    4) "192.168.154.145"
    5) "port"
    6) "6379"
    7) "runid"
    8) "e740b7285067b2dbb8c2640745196099460f4bb3"
    9) "flags"
   10) "s_down,slave,disconnected"

...
2)  1) "name"
    2) "192.168.154.145:7001"
    3) "ip"
    4) "192.168.154.145"
    5) "port"
    6) "7001"
    7) "runid"
    8) "19a7647509ba020adfd06b1eb40f1f35d06c549d"
    9) "flags"
   10) "slave"
...
127.0.0.1:26379> 

#登录slave从节点
[root@mail ~]# redis-cli -a 123456 -p 7001
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.

#查看所有数据
127.0.0.1:7001> keys *
1) "age"
2) "name"

#查看age数据
127.0.0.1:7001> get age
"25"

#尝试修改数据
127.0.0.1:7001> set age 30
(error) READONLY You can't write against a read only replica.
#修改失败，slave从节点 数据只读