Docker搭建Redis集群

Docker搭建Redis集群

注意：Redis搭建集群最少需要6个Redis节点，其中3个作为主节点，3个作为从节点；

为了方便，这里用Docker在一台机器上启动6个容器来作为集群，生产上建议用多台服务器搭建；

1. 创建Redis配置文件

   集群的访问密码，Redis访问密码需要自己改以下，这里默认为2022

#!/bin/bash
if [ ! $1 ]; then
    echo "请输入Redis配置文件存放路径,例如:/home"
    exit 1
fi
for port in $(seq 1 6);
do
mkdir -p $1/redis/node-${port}/conf
mkdir -p $1/redis/node-${port}/data
touch $1/redis/node-${port}/conf/redis.conf
cat << EOF > $1/redis/node-${port}/conf/redis.conf
#port(端口号)
port 6379
bind 0.0.0.0
#masterauth(设置集群节点间访问密码,跟下面一致)
masterauth 2022
#requirepass(设置Redis访问密码)
requirepass 2022
#cluster-enabled yes(启动集群模式)
cluster-enabled yes
#cluster-config-file nodes.conf(集群节点信息文件)
cluster-config-file nodes.conf
#cluster-node-timeout 5000(Redis节点宕机被发现的时间)
cluster-node-timeout 5000
#cluster-announce-ip(集群节点的汇报ip,防止nat,预先填写为网关ip后续需要手动修改配置文件)
cluster-announce-ip 172.18.0.1${port}
#cluster-announce-port(集群节点的汇报port,防止nat)
cluster-announce-port 6379
#cluster-announce-bus-port(集群节点的汇报bus-port,防止nat)
cluster-announce-bus-port 16379
#appendonly yes(开启aof)
appendonly yes
EOF
done
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运行脚本，在home目录下可以看到创建好的6个Redis配置文件

(base) ➜  ~ chmod +x redis_conf.sh
(base) ➜  ~ ./redis_conf.sh /home
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2. 创建docker-compose脚本

自行修改IP和端口,需要和上面的Redis配置文件保持一致

version: '3'
services:
  # redis-1
  redis-1:
    image: redis:latest
    container_name: redis-1
    hostname: redis-1
    ports:
      - "6371:6379"
      - "16371:16379"
    command: "redis-server /etc/redis/redis.conf"
    environment:
      - TZ=Asia/Shanghai
    volumes:
      - ./redis/node-1/data:/data
      - ./redis/node-1/conf/redis.conf:/etc/redis/redis.conf
    networks:
      tools_net:
        ipv4_address: 172.18.0.11
  # redis-2
  redis-2:
    image: redis:latest
    container_name: redis-2
    hostname: redis-2
    ports:
      - "6372:6379"
      - "16372:16379"
    command: "redis-server /etc/redis/redis.conf"
    environment:
      - TZ=Asia/Shanghai
    volumes:
      - ./redis/node-2/data:/data
      - ./redis/node-2/conf/redis.conf:/etc/redis/redis.conf
    networks:
      tools_net:
        ipv4_address: 172.18.0.12
  # redis-3
  redis-3:
    image: redis:latest
    container_name: redis-3
    hostname: redis-3
    ports:
      - "6373:6379"
      - "16373:16379"
    command: "redis-server /etc/redis/redis.conf"
    environment:
      - TZ=Asia/Shanghai
    volumes:
      - ./redis/node-3/data:/data
      - ./redis/node-3/conf/redis.conf:/etc/redis/redis.conf
    networks:
      tools_net:
        ipv4_address: 172.18.0.13
  # redis-4
  redis-4:
    image: redis:latest
    container_name: redis-4
    hostname: redis-4
    ports:
      - "6374:6379"
      - "16374:16379"
    command: "redis-server /etc/redis/redis.conf"
    environment:
      - TZ=Asia/Shanghai
    volumes:
      - ./redis/node-4/data:/data
      - ./redis/node-4/conf/redis.conf:/etc/redis/redis.conf
    networks:
      tools_net:
        ipv4_address: 172.18.0.14
  # redis-5
  redis-5:
    image: redis:latest
    container_name: redis-5
    hostname: redis-5
    ports:
      - "6375:6379"
      - "16375:16379"
    command: "redis-server /etc/redis/redis.conf"
    environment:
      - TZ=Asia/Shanghai
    volumes:
      - ./redis/node-5/data:/data
      - ./redis/node-5/conf/redis.conf:/etc/redis/redis.conf
    networks:
      tools_net:
        ipv4_address: 172.18.0.15
  # redis-6
  redis-6:
    image: redis:latest
    container_name: redis-6
    hostname: redis-6
    ports:
      - "6376:6379"
      - "16376:16379"
    command: "redis-server /etc/redis/redis.conf"
    environment:
      - TZ=Asia/Shanghai
    volumes:
      - ./redis/node-6/data:/data
      - ./redis/node-6/conf/redis.conf:/etc/redis/redis.conf
    networks:
      tools_net:
        ipv4_address: 172.18.0.16
networks:
  tools_net:
    ipam:
      config:
        - subnet: 172.18.0.0/24
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启动Redis

(base) ➜  ~ docker-compose up -d
(base) ➜  ~ docker ps
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3. 配置Redis集群

进入其中一台容器,进行Redis集群配置

redis-cli -a 2022 --cluster create 172.18.0.11:6379 172.18.0.12:6379 172.18.0.13:6379 172.18.0.14:6379 172.18.0.15:6379 172.18.0.16:6379 --cluster-replicas 1

(base) ➜  ~ docker exec -it redis-1 bash
# -a 为上面设置的密码
root@redis-1:/data# redis-cli -a 2022 --cluster create 172.18.0.11:6379 172.18.0.12:6379 172.18.0.13:6379 172.18.0.14:6379 172.18.0.15:6379 172.18.0.16:6379 --cluster-replicas 1
# 回车后,会有提示,是否同意设置上面的配置,输入yes,然后集群就算搭建成功了;

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4. 验证集群是否搭建成功

新增一个key,可以看到,数据成功的存入了redis-2这台容器

# 进入其中一台容器,执行如下命令,以集群模式进入
root@redis-1:/data# redis-cli -c -a 2022
127.0.0.1:6379> set name yid
-> Redirected to slot [5798] located at 172.18.0.12:6379
OK
172.18.0.12:6379> get name
"yid"
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# 查看节点
172.18.0.12:6379> CLUSTER NODES
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