09: redis集群之sentinel

1.1 实验说明

　　1、环境说明

　　　　　　1. 前提：本试验环境已经提前安装了docker和docker-compose

　　　　　　2. 说明：本次部署是单机伪集群，想要部署真正的集群，需要将秒个主件拆分到各个机器上去部署，只修改ip地址

　　2、redis三种集群

　　　　　　1. 主从（主从同步原理）

　　　　　　2. sentinel（哨兵模式）

　　　　　　3. codis

　　　　　　详细内容请参考：https://www.cnblogs.com/xiaonq/p/11635195.html

1.2 使用docker-compose部署sentinel

　　1、参考博客

　　　　　　docker-compose部署：https://www.cnblogs.com/boshen-hzb/p/10471665.html

　　　　　　普通部署：https://www.cnblogs.com/kevingrace/p/9004460.html

　　2、使用docker-compose部署

redis-sentinel                        # 项目根路径
    ├── docker-compose.yml            # docker-compose文件
    └── sentinel                      # 存放初始化sentinel容器的相关文件
        ├── Dockerfile                # sentinel构建镜像文件
        ├── sentinel.conf             # sentinel配置文件
        └── sentinel-entrypoint.sh    # sentinel.sh启动脚本

master:
  image: redis
  command: redis-server --port 6379 --requirepass 123456 --masterauth 123456
  ports:
    - "6379:6379"
slave1:
  image: redis
  command: redis-server --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456
  links:
    - master:redis-master
  ports:
    - "6380:6379"
slave2:
  image: redis
  command: redis-server --slaveof redis-master 6379 --requirepass 123456 --masterauth 123456
  links:
    - master:redis-master
  ports:
    - "6381:6379"
sentinel1:
  build: sentinel
  environment:
    - SENTINEL_DOWN_AFTER=5000
    - SENTINEL_FAILOVER=5000    
  links:
    - master:redis-master
    - slave1
  ports:
    - "26379:26379"
sentinel2:
  build: sentinel
  environment:
    - SENTINEL_DOWN_AFTER=5000
    - SENTINEL_FAILOVER=5000    
  links:
    - master:redis-master
    - slave2
  ports:
    - "26380:26379"

redis-sentinel/docker-compose.yml

FROM redis

EXPOSE 26379
ADD sentinel.conf /etc/redis/sentinel.conf
RUN chown redis:redis /etc/redis/sentinel.conf
COPY sentinel-entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/sentinel-entrypoint.sh
ENTRYPOINT ["sentinel-entrypoint.sh"]

redis-sentinel/sentinel/Dockerfile

port 26379
protected-mode no
sentinel monitor mymaster redis-master 6379 2
sentinel down-after-milliseconds mymaster 5000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 5000

redis-sentinel/sentinel/sentinel.conf

#!/bin/sh

sed -i "s/$SENTINEL_QUORUM/$SENTINEL_QUORUM/g" /etc/redis/sentinel.conf
sed -i "s/$SENTINEL_DOWN_AFTER/$SENTINEL_DOWN_AFTER/g" /etc/redis/sentinel.conf
sed -i "s/$SENTINEL_FAILOVER/$SENTINEL_FAILOVER/g" /etc/redis/sentinel.conf

exec docker-entrypoint.sh redis-server /etc/redis/sentinel.conf --sentinel

sentinel-entrypoint.sh

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