Docker 搭建 redis 集群

本文搭建的集群一共有三个小集群,即3个master节点,每个master节点有2两个slave节点

拉取redis镜像

docker pull redis

初始化swarm 集群

 docker swarm init

创建通信网络

docker network create -d overlay redis-net  

配置docker-compose

version: '3'
services:
  redis-1:
    image: redis
    command: redis-server /usr/local/etc/redis/redis.conf --appendonly yes --cluster-enabled yes
    volumes:
      - ./redis1.conf:/usr/local/etc/redis/redis.conf
    ports:
      - "6379:6379"
    networks:
      redis-net:
        aliases:
          - redis-1
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.type == redis

  redis-2:
    image: redis
    command: redis-server /usr/local/etc/redis/redis.conf --appendonly yes --cluster-enabled yes
    volumes:
      - ./redis2.conf:/usr/local/etc/redis/redis.conf
    ports:
      - "6380:6379"
    networks:
      redis-net:
        aliases:
          - redis-2
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.type == redis

  redis-3:
    image: redis
    command: redis-server /usr/local/etc/redis/redis.conf --appendonly yes --cluster-enabled yes
    volumes:
      - ./redis3.conf:/usr/local/etc/redis/redis.conf
    ports:
      - "6381:6379"
    networks:
      redis-net:
        aliases:
          - redis-3
    deploy:
      replicas: 1
      placement:
        constraints:
          - node.labels.type == redis

  redis-4:
    image: redis
    command: redis-server /usr/local/etc/redis/redis-slave.conf --appendonly yes --cluster-enabled yes
    volumes:
      - ./redis-slave.conf:/usr/local/etc/redis/redis-slave.conf
    networks:
      redis-net:
        aliases:
          - redis-4
    deploy:
      replicas: 2
      placement:
        constraints:
          - node.labels.type == redis

  redis-5:
    image: redis
    command: redis-server /usr/local/etc/redis/redis-slave.conf --appendonly yes --cluster-enabled yes
    volumes:
      - ./redis-slave.conf:/usr/local/etc/redis/redis-slave.conf
    networks:
      redis-net:
        aliases:
          - redis-5
    deploy:
      replicas: 2
      placement:
        constraints:
          - node.labels.type == redis

  redis-6:
    image: redis
    command: redis-server /usr/local/etc/redis/redis-slave.conf --appendonly yes --cluster-enabled yes
    volumes:
      - ./redis-slave.conf:/usr/local/etc/redis/redis-slave.conf
    networks:
      redis-net:
        aliases:
          - redis-6
    deploy:
      replicas: 2
      placement:
        constraints:
          - node.labels.type == redis

networks:
  redis-net:
    attachable: true

redis 配置文件

配置文件的放在上面docker-compose.yml的同级目录下

bind 0.0.0.0
protected-mode no
port 6379
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes

部署 Docker stack

命令的作用是使用 Docker Compose 部署一个 Docker stack。它会根据 docker-compose.yml 文件中定义的服务和配置信息，在 Docker swarm 集群中启动一个 Docker stack，包含了多个服务。在这个例子中，我们使用它来启动一个 Redis 集群，其中包含了多个 Redis 实例的容器。

docker stack deploy -c docker-compose.yml redis-cluster

启动redis容器

docker-compose up

获取各个redis容器的ip

docker inspect -f '{{.Name}} - {{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker ps -aq)

结果:

构建集群

## 先进入一个容器内部
docker exec -it 1333df3ca93c1cbab0a3e2ad60a8cdb2fa651025c1d7d6dfec351bca26b465e3 bash

## 构建集群 后面的ip和端口是上面获取到的ip信息
redis-cli --cluster create --cluster-replicas 2 192.168.0.2:6379 192.168.0.3:6379 192.168.0.4:6379 192.168.0.5:6379 192.168.0.6:6379 192.168.0.7:6379 192.168.0.8:6379 192.168.0.9:6379 192.168.0.10:6379

查看集群信息

先连接任何一个redis客户端
然后执行命令:

cluster info

如果搭建成功,结果如下

查看节点信息

cluster nodes