docker搭建redis三主三从集群，及其常见问题解决

目录结构

redis.conf主要参数

每个配置文件都要修改对应的端口

bind 0.0.0.0
protected-mode no
#每个配置文件都要修改端口
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
supervised no
loglevel notice
#日志文件路径
#logfile "/mydata/master_redis/log/6379.log"
databases 16
always-show-logo yes
save ""
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir ./
masterauth "admin"
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
#slaveof ip1 6379
#slave-announce-ip ip1
#slave-announce-port 6379

#配置密码
requirepass "admin"

#配置集群相关
cluster-enabled yes
cluster-config-file node.conf
cluster-node-timeout 5000


#开启aof
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec

aof-rewrite-incremental-fsync yes

docker-compose.yml

version: '3.1'
services:
  cluster_redis_6379:
    image: redis:latest
    container_name: cluster_redis_6379
    # network_mode: "host"
    restart: always
    ports:
      - 6379:6379
      - 16379:16379
    command: redis-server /etc/redis/redis.conf
    volumes:
      - ./data/data_6379:/data
      - ./conf/redis_6379.conf:/etc/redis/redis.conf

  cluster_redis_6380:
    image: redis:latest
    container_name: cluster_redis_6380
    # network_mode: "host"
    restart: always
    ports:
      - 6380:6380
      - 16380:16380
    command: redis-server /etc/redis/redis.conf
    volumes:
      - ./data/data_6380:/data
      - ./conf/redis_6380.conf:/etc/redis/redis.conf

  cluster_redis_6381:
    image: redis:latest
    container_name: cluster_redis_6381
    # network_mode: "host"
    restart: always
    ports:
      - 6381:6381
      - 16381:16381
    command: redis-server /etc/redis/redis.conf
    volumes:
      - ./data/data_6381:/data
      - ./conf/redis_6381.conf:/etc/redis/redis.conf

  cluster_redis_6382:
    image: redis:latest
    container_name: cluster_redis_6382
    # network_mode: "host"
    restart: always
    ports:
      - 6382:6382
      - 16382:16382
    command: redis-server /etc/redis/redis.conf
    volumes:
      - ./data/data_6382:/data
      - ./conf/redis_6382.conf:/etc/redis/redis.conf

  cluster_redis_6383:
    image: redis:latest
    container_name: cluster_redis_6383
    # network_mode: "host"
    restart: always
    ports:
      - 6383:6383
      - 16383:16383
    command: redis-server /etc/redis/redis.conf
    volumes:
      - ./data/data_6383:/data
      - ./conf/redis_6383.conf:/etc/redis/redis.conf

  cluster_redis_6384:
    image: redis:latest
    container_name: cluster_redis_6384
    # network_mode: "host"
    restart: always
    ports:
      - 6384:6384
      - 16384:16384
    command: redis-server /etc/redis/redis.conf
    volumes:
      - ./data/data_6384:/data
      - ./conf/redis_6384.conf:/etc/redis/redis.conf

容器内端口不能都是是6379，集群总线接口是端口号+10000
端口号与network_mode: "host"不能一起配置，出现下述问题“主机”网络模式与端口绑定不兼容问题，具体看github,有对应解释。

ERROR: for cluster_redis_6379  "host" network_mode is
 incompatible with port_bindings

https://github.com/docker/compose/issues/8326

启动redis容器

docker-compose up -d

进入容器

 docker exec -it cluster_redis_6379 bash

搭建集群

 redis-cli -a admin --cluster create \
  47.120.0.38:6379 \
  47.120.0.38:6380 \ 
  47.120.0.38:6381 \ 
  47.120.0.38:6382 \
  47.120.0.38:6383 \
  47.120.0.38:6384 \
  --cluster-replicas 1   #一个主节点分配一个从节点

集群节点分配结果

集群槽位分配结果

遇到的问题

如果一直卡在Waiting for the cluster to join，那一般是端口问题，看看集群总线端口是否开启，我在这遇到问题，修改了redis.conf中的端口，将容器中端口都是6379改成不同的,并且在docker-compose.yml的port中，加上各个节点的总线端口好了。

查看集群所有节点的关系

cluster nodes

查看单个节点信息

 info replication

集群数据库数量问题

Response received : -ERR SELECT is not allowed in cluster mode

在集群模式下这个配置是不起作用的，集群客户端是不支持多数据库db的，只有一个数据库默认是SELECT 0;

在某个控制台里，比如6379,如果存放的key值对应的槽位不在6379的槽位之中，是不能存放的

127.0.0.1:6379> set 222 222
(error) MOVED 7715 47.120.0.38:6380