基于docker实现redis高可用集群

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简介

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

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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: '3.1'
  services:
          master:
                  image: redis
                  container_name: redis-master
                  ports:
                          - 6379:6379
          slave1:
                  image: redis
                  container_name: redis-slave-1
                  ports:
                          - 6380:6379
                  command: redis-server --slaveof redis-master 6379  #绑定主redis:redis是主redis的计算机名，6379为主redis的接口
          slave2:
                  image: redis
                  container_name: redis-slave-2
                  ports:
                          - 6381:6379
                  command: redis-server --slaveof redis-master 6379  #绑定主redis:red is是主redis的计算机名，6379为主redis的接口

• 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

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.cong)，分别为sentinel容器提供配置，为了方便，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192.168.145.128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,所以可以设置为2）
  sentinel deny-scripts-reconfig yes
  sentinel monitor mymaster 192.168.145.128 6379 2
  sentinel down-after-milliseconds mymaster 300000
  sentinel config-epoch mymaster 0
  sentinel parallel-syncs mymaster 1
  sentinel failover-timeout mymaster 180000

• 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信息
  sentinel master mymaster

• 能看到如下结果，说明部署成功

  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"