基于docker compose实现redis高可用集群(哨兵模式)

基于docker-compose实现redis高可用集群(哨兵模式)

yls
2019-9-20

简介

基于docker和docker-compose
使用redis集群和sentinel集群，达到redis高可用，为缓存做铺垫
每一个redis要匹配一个sentinel;多个sentinel之间要互相关联

搭建redis集群

新建redis文件夹，在该文件夹下创建docker-compose.yml文件，输入如下内容

version: '3.7'
    services:
    master:
    image: redis
    container_name: redis-master
    restart: always
    command: redis-server /etc/redis/redis.conf  --bind 0.0.0.0 --port 6382 --requirepass test@dbuser2018  --appendonly yes
    ports:
    - 6382:6382
    network_mode: "host"
    volumes:
    - ./data:/data
    - ./redis.conf:/etc/redis/redis.conf

    slave1:
    image: redis
    container_name: redis-slave-1
    restart: always
    command: redis-server /etc/redis/redis.conf --bind 0.0.0.0 --slaveof 39.97.234.52 6382 --port 6380  --requirepass test@dbuser2018 --masterauth test@dbuser2018  --appendonly yes
    ports:
    - 6380:6380
    network_mode: "host"
    volumes:
    - ./data:/data
    - .redis.conf:/etc/redis/redis.conf


    slave2:
    image: redis
    container_name: redis-slave-2
    restart: always
    #39.97.234.52设置成公网，当前容器ip就是公网ip
    #--bind 0.0.0.0表示任何ip都可以访问当前容器
    command: redis-server /etc/redis/redis.conf --bind 0.0.0.0 --slaveof 39.97.234.52 6382 --port 6381  --requirepass test@dbuser2018 --masterauth test@dbuser2018  --appendonly yes
    ports:
    - 6381:6381
    #与主机使用同一个ip
    network_mode: "host"
    volumes:
    - ./data:/data
    - ./redis.conf:/etc/redis/redis.conf

运行redis容器：在docker-compose.yml当前所在文件夹下，运行命令

        docker-compose up -d

可以使用如下命令查看日志

docker logs -f 容器ID

搭建sentinel集群

新建sentinel文件夹，在该文件夹下创建docker-compose.yml文件，输入如下内容

version: '3.1'
services:
        sentinel1:
                image: redis
                container_name: redis-sentinel-1
                ports:
                        - 26379:26379
                command: redis-sentinel /usr/local/etc/redis/sentinel.conf
                volumes:
                        - ./sentinel1.conf:/usr/local/etc/redis/sentinel.conf

        sentinel2:
                image: redis
                container_name: redis-sentinel-2
                ports:
                        - 26380:26379
                command: redis-sentinel /usr/local/etc/redis/sentinel.conf
                volumes:
                        - ./sentinel2.conf:/usr/local/etc/redis/sentinel.conf

        sentinel3:
                image: redis
                container_name: redis-sentinel-3
                ports:
                        - 26381:26379
                command: redis-sentinel /usr/local/etc/redis/sentinel.conf
                volumes:
                        - ./sentinel3.conf:/usr/local/etc/redis/sentinel.conf

创建三个数据卷配置文件(sentinel1.conf,sentinel2.conf,sentinel3.conf)，分别为sentinel容器提供配置，我这里将三个配置文件内容设置成一样

port 26379
dir /tmp
# 自定义集群名，其中 39.97.234.52 为 redis-master 的 ip，6382 为 redis-master 的端口，2 为最小投票数（因为有 3 台 Sentinel 所以可以设置成 2）
sentinel monitor mymaster 39.97.234.52 6382 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel auth-pass mymaster test@dbuser2018
sentinel failover-timeout mymaster 180000
sentinel deny-scripts-reconfig yes

运行sentinel集群：与docker-compose同级目录下，运行如下命令
```
docker-compose up -d
```

验证是否成功部署

以交互的方式进入任意一个sentinel容器
```
docker exec -it redis-sentinel-1 bash
```
在进入的sentinel容器中，通过命令的方式进入redis客户端
```
 redis-cli -p 26379
```
在客户端中查看此sentinel对应的redis主节点信息
```
sentinel master mymaster
```

能看到如下结果，说明正常

1) "name"
2) "mymaster"
3) "ip"
4) "192.168.145.128"
5) "port"
6) "6379"
7) "runid"
8) "324f148cf69ef6d2a86cfa4bdfc4f6937974b7b8"
9) "flags"
10) "master"
11) "link-pending-commands"
12) "0"
13) "link-refcount"
14) "1"
15) "last-ping-sent"
16) "0"
17) "last-ok-ping-reply"
18) "561"
19) "last-ping-reply"
20) "561"
21) "down-after-milliseconds"
22) "300000"
23) "info-refresh"
24) "7109"
25) "role-reported"
26) "master"
27) "role-reported-time"
28) "4454165"
29) "config-epoch"
30) "0"
31) "num-slaves"
32) "2"
33) "num-other-sentinels"
34) "2"
35) "quorum"
36) "2"
37) "failover-timeout"
38) "180000"
39) "parallel-syncs"
40) "1"

如下命令查看redis从节点是否正常

sentinel slaves mymaster

显示如下说明正常

1) "name"
    2) "39.97.234.52:6381"
    3) "ip"
    4) "39.97.234.52"
    5) "port"
    6) "6381"
    7) "runid"
    8) "4223d038a4899d77d17e15c8f7af446649c6ddad"
    9) "flags"
   10) "slave"
   11) "link-pending-commands"
   12) "0"
   13) "link-refcount"
   14) "1"
   15) "last-ping-sent"
   16) "0"
   17) "last-ok-ping-reply"
   18) "111"
   19) "last-ping-reply"
   20) "111"
   21) "down-after-milliseconds"
   22) "30000"
   23) "info-refresh"
   24) "2984"
   25) "role-reported"
   26) "slave"
   27) "role-reported-time"
   28) "1145357"
   29) "master-link-down-time"
   30) "0"
   31) "master-link-status"
   32) "ok"
   33) "master-host"
   34) "39.97.234.52"
   35) "master-port"
   36) "6382"
   37) "slave-priority"
   38) "100"
   39) "slave-repl-offset"
   40) "164572"