Docker 部署 Redis5.0 集群，以及 ioredis 连接集群

系统
database, server

Redis的高可用模式分为两种——集群模式和哨兵模式，本文主要介绍基于docker部署集群的方法。

  • 此处使用docker compose进行部署，首先需要下载redis镜像
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docker pull redis
  • 创建redis集群文件夹
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# 假设集群的slot分配为3份，副本数为1，则共需要6个节点
# 创建7000, 7001, 7002, 7003, 7004, 7005 共6个文件夹
mkdir 7000
  • 在以上6个文件夹中分别创建redis配置文件，其中端口号根据节点文件夹名称保持一致
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# 文件名：redis.conf
## 节点端口：7000, 7001, 7002, 7003, 7004, 7005
port 7000

## cluster集群模式
cluster-enabled yes

## 集群配置名
cluster-config-file nodes.conf

## 关闭保护模式
#protected-mode no

## 超时时间
cluster-node-timeout 5000

## 持久化模式
appendonly yes
  • 创建集群的docker网络
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# 网络名称redis-cluster，下一步用到，默认使用bridge模式
docker network redis-cluster
  • 在集群文件夹根目录下创建docker compose配置文件
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# 文件名：docker-compose.yml
redis-7000:
  # 基于redis镜像构建
  image: redis
  # 使用上一步创建的docker网络
  net: "redis-cluster"
  restart: always
  privileged: true
  # 对外暴露redis连接端口7000，以及集群间相互通讯的端口17000，通讯端口=连接端口+10000
  ports:
    - 7000:7000
    - 17000:17000
  # 映射配置文件和数据存储文件夹到redis节点容器内部
  volumes:
    - /redis-cluster/7000/redis.conf:/etc/redis/redis.conf
    - /redis-cluster/7000/data:/data
  # 默认执行命令，使用redis.conf启动redis
  command: ["redis-server", "/etc/redis/redis.conf"]
redis-7001:
  image: redis
  net: "redis-cluster"
  restart: always
  privileged: true
  ports:
    - 7001:7001
    - 17001:17001
  volumes:
    - /redis-cluster/7001/redis.conf:/etc/redis/redis.conf
    - /redis-cluster/7001/data:/data
  command: ["redis-server", "/etc/redis/redis.conf"]
redis-7002:
  image: redis
  net: "redis-cluster"
  restart: always
  privileged: true
  ports:
    - 7002:7002
    - 17002:17002
  volumes:
    - /redis-cluster/7002/redis.conf:/etc/redis/redis.conf
    - /redis-cluster/7002/data:/data
  command: ["redis-server", "/etc/redis/redis.conf"]
redis-7003:
  image: redis
  net: "redis-cluster"
  restart: always
  privileged: true
  ports:
    - 7003:7003
    - 17003:17003
  volumes:
    - /redis-cluster/7003/redis.conf:/etc/redis/redis.conf
    - /redis-cluster/7003/data:/data
  command: ["redis-server", "/etc/redis/redis.conf"]
redis-7004:
  image: redis
  net: "redis-cluster"
  restart: always
  privileged: true
  ports:
    - 7004:7004
    - 17004:17004
  volumes:
    - /redis-cluster/7004/redis.conf:/etc/redis/redis.conf
    - /redis-cluster/7004/data:/data
  command: ["redis-server", "/etc/redis/redis.conf"]
redis-7005:
  image: redis
  net: "redis-cluster"
  restart: always
  privileged: true
  ports:
    - 7005:7005
    - 17005:17005
  volumes:
    - /redis-cluster/7005/redis.conf:/etc/redis/redis.conf
    - /redis-cluster/7005/data:/data
  command: ["redis-server", "/etc/redis/redis.conf"]
  • 启动docker容器
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docker-compose up -d

启动完成后，查看容器情况

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docker ps

CONTAINER ID        IMAGE               COMMAND                  PORTS                                                        NAMES
e3b9b2104d16        redis               "docker-entrypoint.s…"   0.0.0.0:7005->7005/tcp, 6379/tcp, 0.0.0.0:17005->17005/tcp   redis-cluster_redis-7005_1
......

查看各容器IP

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docker network inspect redis-cluster

## 可以查看到redis-cluster网络下，各节点的内网IP，示例如下
"e3b9b2104d16fef938efde2a82da4a919c3fff456657a3c166f79325ceb3969c": {
    "Name": "redis-cluster_redis-7005_1",
    "EndpointID": "56467236c42862e73f924371fa2145f91c48b0aa6ccd7304b22e7329f00e32d4",
    "MacAddress": "02:42:ac:14:00:07",
    ## 可以看到7005节点的内网IP是172.20.0.7
    "IPv4Address": "172.20.0.7/16",
    "IPv6Address": ""
},
......
  • 根据上面查到的IP地址构建集群关联命令，并执行，其中需要输入 yes 进行确认
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# 按照 ip:端口 的模式拼接6个节点的信息
redis-cli --cluster create 172.20.0.2:7000 172.20.0.4:7001 172.20.0.5:7002 172.20.0.6:7003 172.20.0.3:7004 172.20.0.7:7005 --cluster-replicas 1
  • 测试集群情况
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redis-cli -p 7000 cluster nodes

# 出现以下信息表示集群构建成功
1c5811fde15d56bbbbf68aa55b6b6a6523a7781a 172.20.0.6:7003@17003 slave b9697bec499b47020753397f99d5eb0fb1340616 0 1550471531098 4 connected
b9697bec499b47020753397f99d5eb0fb1340616 172.20.0.2:7000@17000 myself,master - 0 1550471530000 1 connected 0-5460
4b37f8c44aeaab184b423926a384081e27d2d97d 172.20.0.7:7005@17005 slave e991cb1601d557f97fb89b2a8eee3daaa479ef67 0 1550471530000 6 connected
e991cb1601d557f97fb89b2a8eee3daaa479ef67 172.20.0.5:7002@17002 master - 0 1550471529880 3 connected 10923-16383
42ddc0966cc80b9795bf45f4f826c93991db0af2 172.20.0.4:7001@17001 master - 0 1550471529000 2 connected 5461-10922
c11ea451ba7fd6ae21e8ce6043981fa3f2aaddaa 172.20.0.3:7004@17004 slave 42ddc0966cc80b9795bf45f4f826c93991db0af2 0 1550471530896 5 connected
  • ioredis

集群构建成功后，如果使用ioredis连接，需要声明natMap属性，代码如下：

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import Redis from 'ioredis'

// 外部地址和端口
let cluster = [
    {host: 'localhost', port: 7000},
    {host: 'localhost', port: 7001},
    {host: 'localhost', port: 7002},
    {host: 'localhost', port: 7003},
    {host: 'localhost', port: 7004},
    {host: 'localhost', port: 7005}
]
let options = {
    // 声明每个内网 IP:端口 对应的外部地址和端口
    natMap: {
        '172.20.0.2:7000': {host: 'localhost', port: 7000},
    	'172.20.0.4:7001': {host: 'localhost', port: 7001},
    	'172.20.0.5:7002': {host: 'localhost', port: 7002},
    	'172.20.0.6:7003': {host: 'localhost', port: 7003},
    	'172.20.0.3:7004': {host: 'localhost', port: 7004},
    	'172.20.0.7:7005': {host: 'localhost', port: 7005}
    }
}
const client = new Redis.Cluster(cluster, options)
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