docker部署redis哨兵模式

Redis单机服务最怕的是宕机了，一旦宕机，可能会导致系统不可用或导致其他一系列的问题。后来出现了redis集群，但是redis集群没有实现自动发现故障和对主从机器进行切换。

Redis Sentinel 是官方推荐的高可用性解决方案。它不会因为节点宕机而导致服务不可用，同时，它可以作为监控管理工具，可以提供节点监控、通知、自动故障恢复和客户端配置发现服务等，即使出现了故障，也能很快知道，并进行修复。

开始搭建：创建一个文件夹，用于适用docker-compose.yml文件

1.编写docker-compose

mkdir -p /opt/docker/{redis-1,redis-2,redis-3,sentinel}
mkdir -p /opt/docker/redis/redis-1/data
mkdir -p /opt/docker/redis/redis-2/data
mkdir -p /opt/docker/redis/redis-3/data

#docker network create redis_cluster #创建网络

#这里因为是在一个节点,最好是用host网络模式,否则哨兵返回ip为容器ip,远程是无法连接的

mkdir -p /opt/docker/{redis-1,redis-2,redis-3,sentinel}

mkdir -p /opt/docker/redis/redis-1/data

mkdir -p /opt/docker/redis/redis-2/data

mkdir -p /opt/docker/redis/redis-3/data

#docker network create redis_cluster #创建网络

#这里因为是在一个节点,最好是用host网络模式,否则哨兵返回ip为容器ip,远程是无法连接的

2.创建配置文件redis.conf

vim /opt/docker/redis/redis-1/redis.conf

port 6379

vim /opt/docker/redis/redis-2/redis.conf

port 6380

vim /opt/docker/redis/redis-3/redis.conf

port 6381

vim /opt/docker/redis/redis-1/redis.conf

port 6379

vim /opt/docker/redis/redis-2/redis.conf

port 6380

vim /opt/docker/redis/redis-3/redis.conf

port 6381

redis-cluster.yaml

version: '3.7'
services:
  master:
    image: redis
    container_name: redis-master
    restart: always
    #networks:
    #  - "redis_cluster"
    network_mode: "host"
    command: redis-server --port 6379 --requirepass 123456  --masterauth 123456 --appendonly yes
    #ports:
    #  - 6379:6379
    volumes:
      - /opt/docker/redis/redis-1/data:/data
      - /opt/docker/redis-cluster/redis-1/redis.conf:/usr/local/etc/redis/redis.conf

  slave1:
    image: redis
    container_name: redis-slave-1
    restart: always
    #networks:
    #  - "redis_cluster"
    network_mode: "host"
    command: redis-server --slaveof 192.168.66.180 6379 --port 6380  --requirepass 123456 --masterauth 123456  --appendonly yes
    #ports:
    #  - 6380:6380
    volumes:
      - /opt/docker/redis/redis-2/data:/data
      - /opt/docker/redis-cluster/redis-2/redis.conf:/usr/local/etc/redis/redis.conf

  slave2:
    image: redis
    container_name: redis-slave-2
    restart: always
    #networks:
    #  - "redis_cluster"
    network_mode: "host"
    command: redis-server --slaveof 192.168.66.180 6379 --port 6381  --requirepass 123456 --masterauth 123456  --appendonly yes
    #ports:
    #  - 6381:6381
    volumes:
      - /opt/docker/redis/redis-3/data:/data
      - /opt/docker/redis-cluster/redis-3/redis.conf:/usr/local/etc/redis/redis.conf

#networks:
#  redis_cluster:
#    external: true

version: '3.7'

services:

master:

image: redis

container_name: redis-master

restart: always

#networks:

# - "redis_cluster"

network_mode: "host"

command: redis-server --port 6379 --requirepass 123456 --masterauth 123456 --appendonly yes

#ports:

# - 6379:6379

volumes:

- /opt/docker/redis/redis-1/data:/data

- /opt/docker/redis-cluster/redis-1/redis.conf:/usr/local/etc/redis/redis.conf

slave1:

image: redis

container_name: redis-slave-1

restart: always

#networks:

# - "redis_cluster"

network_mode: "host"

command: redis-server --slaveof 192.168.66.180 6379 --port 6380 --requirepass 123456 --masterauth 123456 --appendonly yes

#ports:

# - 6380:6380

volumes:

- /opt/docker/redis/redis-2/data:/data

- /opt/docker/redis-cluster/redis-2/redis.conf:/usr/local/etc/redis/redis.conf

slave2:

image: redis

container_name: redis-slave-2

restart: always

#networks:

# - "redis_cluster"

network_mode: "host"

command: redis-server --slaveof 192.168.66.180 6379 --port 6381 --requirepass 123456 --masterauth 123456 --appendonly yes

#ports:

# - 6381:6381

volumes:

- /opt/docker/redis/redis-3/data:/data

- /opt/docker/redis-cluster/redis-3/redis.conf:/usr/local/etc/redis/redis.conf

#networks:

# redis_cluster:

# external: true

2. 启动redis,使用如下命令 -d 挂在后台

docker-compose -f redis-cluster.yaml up -d

1	docker-compose -f redis-cluster.yaml up -d

查看集群状态

info replication

1	info replication

可以再去其他节点,get name看看是否主从同步正常

1	可以再去其他节点,get name看看是否主从同步正常

至此,redis一主二从完毕,如果想知道数据是否被持久化可以执行如下命令。查看是否有name这个key，有则表明数据持久化成功。 

docker-compose -f [yaml] down
docker-compose -f [yaml] up -d

至此,redis一主二从完毕,如果想知道数据是否被持久化可以执行如下命令。查看是否有name这个key，有则表明数据持久化成功。

docker-compose -f [yaml] down

docker-compose -f [yaml] up -d

部署redis-sentinel

1.编写sentinel.conf

vim sentinel.conf

1	vim sentinel.conf

port 26379
dir /tmp
#自定义集群名mymaster，其中 192.168.66.180 为 redis-master的ip,6379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 192.168.66.180 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel parallel-syncs mymaster 1
sentinel auth-pass mymaster 123456
sentinel failover-timeout mymaster 180000
sentinel deny-scripts-reconfig yes

port 26379

dir /tmp

#自定义集群名mymaster，其中 192.168.66.180 为 redis-master的ip,6379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 192.168.66.180 6379 2

sentinel down-after-milliseconds mymaster 30000

sentinel parallel-syncs mymaster 1

sentinel auth-pass mymaster 123456

sentinel failover-timeout mymaster 180000

sentinel deny-scripts-reconfig yes

#执行如下命令,复制3份redis-sentinel配置文件
cp sentinel.conf /opt/docker/redis/sentine/sentinel1.conf
cp sentinel.conf /opt/docker/redis/sentine/sentinel2.conf
cp sentinel.conf /opt/docker/redis/sentine/sentinel3.conf

#执行如下命令,复制3份redis-sentinel配置文件

cp sentinel.conf /opt/docker/redis/sentine/sentinel1.conf

cp sentinel.conf /opt/docker/redis/sentine/sentinel2.conf

cp sentinel.conf /opt/docker/redis/sentine/sentinel3.conf

#注意: sentinel1.conf sentinel2.conf sentinel3.conf 端口分别为26379...26381

1	#注意: sentinel1.conf sentinel2.conf sentinel3.conf 端口分别为26379...26381

2.编写docker-compose.yml

version: '3.7'
services:
  sentinel1:
    image: redis
    container_name: redis-sentinel-1
    command: redis-sentinel /usr/local/etc/redis/sentinel.conf
    restart: always
    network_mode: "host"
    #networks:
    #  - "redis_cluster"
    #ports:
    #  - 26379:26379
    volumes:
      - /opt/docker/redis/sentine/sentinel1.conf:/usr/local/etc/redis/sentinel.conf

  sentinel2:
    image: redis
    container_name: redis-sentinel-2
    command: redis-sentinel /usr/local/etc/redis/sentinel.conf
    restart: always
    network_mode: "host"
    #networks:
    #  - "redis_cluster"
    #ports:
    #  - 26380:26379
    volumes:
      - /opt/docker/redis/sentine/sentinel2.conf:/usr/local/etc/redis/sentinel.conf

  sentinel3:
    image: redis
    container_name: redis-sentinel-3
    command: redis-sentinel /usr/local/etc/redis/sentinel.conf
    restart: always
    network_mode: "host"
    #networks:
    #  - "redis_cluster"
    #ports:
    #  - 26381:26379
    volumes:
      - /opt/docker/redis/sentine/sentinel3.conf:/usr/local/etc/redis/sentinel.conf
#networks:
#  redis_cluster:
#    external: true

version: '3.7'

services:

sentinel1:

image: redis

container_name: redis-sentinel-1

command: redis-sentinel /usr/local/etc/redis/sentinel.conf

restart: always

network_mode: "host"

#networks:

# - "redis_cluster"

#ports:

# - 26379:26379

volumes:

- /opt/docker/redis/sentine/sentinel1.conf:/usr/local/etc/redis/sentinel.conf

sentinel2:

image: redis

container_name: redis-sentinel-2

command: redis-sentinel /usr/local/etc/redis/sentinel.conf

restart: always

network_mode: "host"

#networks:

# - "redis_cluster"

#ports:

# - 26380:26379

volumes:

- /opt/docker/redis/sentine/sentinel2.conf:/usr/local/etc/redis/sentinel.conf

sentinel3:

image: redis

container_name: redis-sentinel-3

command: redis-sentinel /usr/local/etc/redis/sentinel.conf

restart: always

network_mode: "host"

#networks:

# - "redis_cluster"

#ports:

# - 26381:26379

volumes:

- /opt/docker/redis/sentine/sentinel3.conf:/usr/local/etc/redis/sentinel.conf

#networks:

# redis_cluster:

# external: true

启动哨兵

docker-compose -f redis-sentinel.yaml up -d

1	docker-compose -f redis-sentinel.yaml up -d

进入redis-sentinel容器中,查看redis连接状态

redis-cli -p 26379

#执行如下命令,查看redis主信息
sentinel master mymaster

# 显示如下表明正常

redis-cli -p 26379

#执行如下命令,查看redis主信息

sentinel master mymaster

# 显示如下表明正常

执行如下命令,查看从redis信息是否正常

sentinel slaves mymaster

# 显示如下表明正常

sentinel slaves mymaster

# 显示如下表明正常

测试主redis挂了之后,哨兵能否正常选举redis

docker stop redis-master

1	docker stop redis-master

查看redis-sentinel日志,看其将那个redis选举为主,如下,其将端口位6381的redis选举为主

可以看到，6380端口的redis被选举为主了，测试端口号为6380的redis是否具备写功能,如下则表明成功

1	可以看到，6380端口的redis被选举为主了，测试端口号为6380的redis是否具备写功能,如下则表明成功

可写，表明故障转移成功！

<完>

如果容器需要资源限制请添加如下设置

limit用于限制最大的资源使用数量，reservation为最低的资源占用量。

1	limit用于限制最大的资源使用数量，reservation为最低的资源占用量。

    deploy:
      resources:
        limits:
          cpus: '0.50'
          memory: 50M
        reservations:
          cpus: '0.25'
          memory: 20M

deploy:

resources:

limits:

cpus: '0.50'

memory: 50M

reservations:

cpus: '0.25'

memory: 20M

本文固定链接: https://www.yoyoask.com/?p=6015
转载请注明: shooter 2019年06月16日于 SHOOTER 发表

最后编辑：2021-06-17

作者：shooter

这个作者貌似有点懒，什么都没有留下。

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