docker redis主从哨兵集群

时间:2022-09-27 慕菲烟云人气:0

本文以docker-compose 搭建高可用Redis 主从、哨兵集群为例子

1：获取redis镜像

docker pull redis:6.2.7

2：创建redis主从+哨兵docker-compose文件

cd /opt/docker/redis
vi docker-compose.yml

docker-compose.yml的内容如下

version: '3'
services:
  master:
    image: redis:6.2.7       ## 镜像
    container_name: redis-master
    command: redis-server /etc/redis/redis.conf --requirepass 123456 --masterauth 123456
    volumes:
    - /opt/docker/redis/data/redis_data1:/data
    - /opt/docker/redis/conf/redis1.conf:/etc/redis/redis.conf
    network_mode: "host"
  slave1:
    image: redis:6.2.7                ## 镜像
    container_name: redis-slave-1
    volumes:
    - /opt/docker/redis/data/redis_data2:/data
    - /opt/docker/redis/conf/redis2.conf:/etc/redis/redis.conf
    command: redis-server /etc/redis/redis.conf --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456 
    depends_on:
    - master
    network_mode: "host"
  slave2:
    image: redis:6.2.7                ## 镜像
    container_name: redis-slave-2
    volumes:
    - /opt/docker/redis/data/redis_data3:/data
    - /opt/docker/redis/conf/redis3.conf:/etc/redis/redis.conf
    command: redis-server /etc/redis/redis.conf --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456
    depends_on:
    - master
    network_mode: "host"
  sentinel1:
    image: redis:6.2.7       ## 镜像
    container_name: redis-sentinel-1
    command: redis-sentinel /usr/local/etc/redis/sentinel.conf
    volumes:
    - /opt/docker/redis/conf/sentinel1.conf:/usr/local/etc/redis/sentinel.conf
    network_mode: "host"
    depends_on:
    - master
    - slave1
    - slave2
  sentinel2:
    image: redis:6.2.7                ## 镜像
    container_name: redis-sentinel-2          
    command: redis-sentinel /usr/local/etc/redis/sentinel.conf
    volumes:
    - /opt/docker/redis/conf/sentinel2.conf:/usr/local/etc/redis/sentinel.conf
    network_mode: "host"
    depends_on:
    - master
    - slave1
    - slave2
  sentinel3:
    image: redis:6.2.7                ## 镜像
    container_name: redis-sentinel-3          
    command: redis-sentinel /usr/local/etc/redis/sentinel.conf
    volumes:
    - /opt/docker/redis/conf/sentinel3.conf:/usr/local/etc/redis/sentinel.conf
    network_mode: "host"
    depends_on:
    - master
    - slave1
    - slave2

3：redis配置和哨兵配置说明

查看配置文件的目录树

cd /opt/docker/redis
tree ./

结构如下

redis1.conf，redis2.conf，redis3.conf配置如下

#redis1.conf
bind 0.0.0.0
port 6379
protected-mode no
slave-read-only no
 
#redis2.conf
bind 0.0.0.0
port 6380
protected-mode no
slave-read-only no
 
#redis3.conf
bind 0.0.0.0
port 6381
protected-mode no
slave-read-only no

sentinel1.conf，sentinel1.conf，sentinel1.conf配置：

#sentinel1.conf
port 26379
dir /tmp
sentinel monitor mymaster 192.168.18.131 6379 2
sentinel auth-pass mymaster 123456 
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 10000  
sentinel deny-scripts-reconfig yes
 
#sentinel2.conf
port 26380
dir /tmp
sentinel monitor mymaster 192.168.18.131 6379 2
sentinel auth-pass mymaster 123456 
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 10000  
sentinel deny-scripts-reconfig yes
 
#sentinel3.conf
port 26381
dir /tmp
sentinel monitor mymaster 192.168.18.131 6379 2
sentinel auth-pass mymaster 123456 
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 10000  
sentinel deny-scripts-reconfig yes

说明：

【sentinel monitor mymaster 192.168.18.131 6379 2】192.168.18.131为服务器的IP地址，6379为redis master的端口号
【sentinel auth-pass mymaster 123456 】设置主节点的密码
【sentinel down-after-milliseconds mymaster 30000】表示在一段时间范围内sentinel向master发送的心跳PING没有回复则认为master不可用了。
【sentinel parallel-syncs mymaster 1】的parallel-syncs表示设置在故障转移之后，同时可以重新配置使用新master的slave的数量。数字越低，更多的时间将会用故障转移完成，但是如果slaves配置为服务旧数据，你可能不希望所有的slave同时重新同步master。因为主从复制对于slave是非阻塞的，当停止从master加载批量数据时有一个片刻延迟。通过设置选项为1，确信每次只有一个slave是不可到达的。
【sentinel failover-timeout mymaster 10000 】表示10秒内mymaster还没活过来，则认为master宕机了。

redis_data1, redis_data2,redis_data3为空文件夹，用于存放redis数据文件

4：启动docker-compose

docker-compose up
#或者，后台启动
docker-compose up -d

5：查看启动情况

6：进入主节点查看集群情况

docker exec -it 主节点容器id或者容器名称 bash
redis-cli -p 6379
info replication

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