Docker容器下Redis的主从配置以及Sentinel哨兵配置

1、拉取redis镜像

docker pull redis

2、启动3个redis容器服务，分别使用到6379、6380、6381端口

docker run --name redis-master -p 6379:6379 -d redis
docker run --name redis-slave1 -p 6380:6379 -d redis
docker run --name redis-slave2 -p 6381:6379 -d redis

3、查看已启动的容器

[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                    NAMES
fb349796fee6        redis               "docker-entrypoint..."   2 hours ago         Up 21 minutes       0.0.0.0:6381->6379/tcp   redis-slave2
6091eaf2475c        redis               "docker-entrypoint..."   2 hours ago         Up 22 minutes       0.0.0.0:6380->6379/tcp   redis-slave1
bc84f8185f77        redis               "docker-entrypoint..."   2 hours ago         Up 24 minutes       0.0.0.0:6379->6379/tcp   redis-master

4、测试容器，成功

docker exec -it ab54741166e1(容器id) redis-cli：进入容器内部

127.0.0.1:6379> set a test
OK
127.0.0.1:6379> get a
"test"
127.0.0.1:6379> quit
root@6091eaf2475c:/data#

5、开始redis集群配置

5.1、看容器内网的ip地址

[root@localhost ~]# docker inspect redis-slave1

这里我们得到3个redis的内网ip地址为：
redis-master：172.17.0.2:6379
redis-slave1：172.17.0.3:6379
redis-slave2：172.17.0.4:6379

5.2、这里我们进入docker容器内部，查看当前redis角色（主还是从）目前三个都是master状态

[root@localhost ~]# docker exec -it 6091eaf2475c /bin/bash
root@6091eaf2475c:/data# redis-cli
127.0.0.1:6379> info replication
# Replication
role:slave
master_host:172.17.0.4
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_repl_offset:532406
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:16f555d7ac3b32ae0584d6b5f320efec3e35b9e6
master_replid2:d8af8d9da6752ca2f0c7a733f5462a0c163c8f7c
master_repl_offset:532406
second_repl_offset:73526
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:29
repl_backlog_histlen:532378

5.3、使用redis-cli命令修改redis-slave1、redis-slave2的主机为172.17.0.2:6379

[root@localhost /]# docker exec -it redis-slave1 /bin/bash
root@6091eaf2475c:/data# redis-cli
127.0.0.1:6379> SLAVEOF 172.17.0.2 6379
OK
127.0.0.1:6379> quit
root@6091eaf2475c:/data# exit
exit
[root@localhost /]# docker exec -it redis-slave2 /bin/bash
root@6091eaf2475c:/data# redis-cli
127.0.0.1:6379> SLAVEOF 172.17.0.2 6379
OK
127.0.0.1:6379> quit
root@6091eaf2475c:/data# exit
exit

5.4、查看redis-master是否已经拥有2个从机，connected_slaves:2，没错

[root@localhost /]# docker exec -it redis-master /bin/bash
root@bc84f8185f77:/data# redis-cli
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=172.17.0.4,port=6379,state=online,offset=70,lag=1
slave1:ip=172.17.0.3,port=6379,state=online,offset=70,lag=1
master_replid:d8af8d9da6752ca2f0c7a733f5462a0c163c8f7c
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:70
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:70

5.5、配置Sentinel哨兵

进入3台redis容器内部进行配置，在容器根目录里面创建sentinel.conf文件

文件内容为：sentinel monitor redis-master 172.17.0.2 6379 1

[root@localhost /]# docker exec -it bc84f8185f77 /bin/bash
root@6091eaf2475c:/data# cd / && touch sentinel.conf
root@6091eaf2475c:/# vim /sentinel.conf

这里如果出现

shell bash: vi: command not found

解决：1、apt-get update 2、apt-get install vim

root@bc84f8185f77:/# redis-sentinel /sentinel.conf
42:X 11 Jun 2019 09:17:41.415 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
42:X 11 Jun 2019 09:17:41.415 # Redis version=5.0.5, bits=64, commit=00000000, modified=0, pid=42, just started
42:X 11 Jun 2019 09:17:41.415 # Configuration loaded
_._
_.-``__ ''-._
_.-``    `.  `_.  ''-._           Redis 5.0.5 (00000000/0) 64 bit
.-`` .-```.  ```\/    _.,_ ''-._
(    '      ,       .-`  | `,    )     Running in sentinel mode
|`-._`-...-` __...-.``-._|'` _.-'|     Port: 26379
|    `-._   `._    /     _.-'    |     PID: 42
`-._    `-._  `-./  _.-'    _.-'
|`-._`-._    `-.__.-'    _.-'_.-'|
|    `-._`-._        _.-'_.-'    |           http://redis.io
`-._    `-._`-.__.-'_.-'    _.-'
|`-._`-._    `-.__.-'    _.-'_.-'|
|    `-._`-._        _.-'_.-'    |
`-._    `-._`-.__.-'_.-'    _.-'
`-._    `-.__.-'    _.-'
`-._        _.-'
`-.__.-'

42:X 11 Jun 2019 09:17:41.417 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
42:X 11 Jun 2019 09:17:41.418 # Sentinel ID is 4d8e0038c5a041074bc86b4dcad46f6798cb0fab
42:X 11 Jun 2019 09:17:41.418 # +monitor master redis-master 172.17.0.2 6379 quorum 1
42:X 11 Jun 2019 09:17:41.422 * +slave slave 172.17.0.4:6379 172.17.0.4 6379 @ redis-master 172.17.0.2 6379
42:X 11 Jun 2019 09:17:41.423 * +slave slave 172.17.0.3:6379 172.17.0.3 6379 @ redis-master 172.17.0.2 6379

5.6、测试

关闭redis-master

[root@localhost ~]# docker stop bc84f8185f77
bc84f8185f77

这时，剩余的2个从机，会自动选举产生新的主机，这里选举172.17.0.2为主机。

查看redis-slave2，变成了主机。

[root@localhost ~]# docker exec -it fb349796fee6 /bin/bash
root@fb349796fee6:/data# redis-cli
127.0.0.1:6379> info replication
# Replication
role:master
connected_slaves:1
slave0:ip=172.17.0.3,port=6379,state=online,offset=81124,lag=0
master_replid:16f555d7ac3b32ae0584d6b5f320efec3e35b9e6
master_replid2:d8af8d9da6752ca2f0c7a733f5462a0c163c8f7c
master_repl_offset:81124
second_repl_offset:73526
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:81124

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