基于docker实现redis高可用集群

基于docker-compose实现redis高可用集群(哨兵模式)

yls

2019-9-20

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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: '3.7'
      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"