第四期 作业六：使用 Docker 本地搭建一套 Redis Cluster 集群

[mercyblitz]

要求：

• 参考 Redis Cluster 官方文档，在本地搭建 N 个 Cluster 节点，能够正常工作

[walklown]

3主3从6节点：
root@docker-desktop:/data# redis-cli -p 6300 127.0.0.1:6300> 127.0.0.1:6300> 127.0.0.1:6300> cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 cluster_size:3 cluster_current_epoch:6 cluster_my_epoch:1 cluster_stats_messages_ping_sent:187 cluster_stats_messages_pong_sent:190 cluster_stats_messages_sent:377 cluster_stats_messages_ping_received:185 cluster_stats_messages_pong_received:187 cluster_stats_messages_meet_received:5 cluster_stats_messages_received:377 total_cluster_links_buffer_limit_exceeded:0

指令测试（需要 redis-cli -c 客户端模式）：
127.0.0.1:6300> set auther walklown -> Redirected to slot [13357] located at 127.0.0.1:6302 OK 127.0.0.1:6302> set f01 walklown -> Redirected to slot [2604] located at 127.0.0.1:6300 OK 127.0.0.1:6300>

[Kurok1]

1.准备配置文件模板
redis.conf.tmpl

port ${PORT}
requirepass 123456
masterauth 123456
protected-mode no
daemonize no
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 15000
cluster-announce-ip ${IP}
cluster-announce-port ${PORT}
cluster-announce-bus-port 1${PORT}

2.快速创建

IP=192.168.1.149     #替换成本机ip
for port in `seq 6379 6381`; do 
  mkdir -p ${port}/conf 
  && PORT=${port} envsubst < redis.conf.tmpl> ${port}/conf/redis.conf 
  && mkdir -p ${port}/data;
done

3.docker-compose.yml

version: "3"

# 定义服务，可以多个
services:
  redis-6379: # 服务名称
    image: redis:6.2.7 # 创建容器时所需的镜像
    container_name: redis-6379 # 容器名称
    network_mode: "host" # host 网络模式
    volumes: # 数据卷，目录挂载
      - ./6379/config/redis.conf:/usr/local/etc/redis/redis.conf
      - ./6379/data:/data
    command: redis-server /usr/local/etc/redis/redis.conf # 覆盖容器启动后默认执行的命令
    ports:
      # 使用宿主机的端口映射到容器的端口
      # 宿主机：容器
      - 6379:6379

  redis-6380:
    image: redis:6.2.7
    container_name: redis-6380
    network_mode: "host"
    volumes:
      - ./6380/config/redis.conf:/usr/local/etc/redis/redis.conf
      - ./6380/data:/data
    command: redis-server /usr/local/etc/redis/redis.conf
    ports:
      # 使用宿主机的端口映射到容器的端口
      # 宿主机：容器
      - 6380:6380

  redis-6381:
    image: redis:6.2.7
    container_name: redis-6381
    network_mode: "host"
    volumes:
      - ./6381/config/redis.conf:/usr/local/etc/redis/redis.conf
      - ./6381/6381/data:/data
    command: redis-server /usr/local/etc/redis/redis.conf
    ports:
      # 使用宿主机的端口映射到容器的端口
      # 宿主机：容器
      - 6381:6381

4.启动容器

docker-compose up -d

5.进入任一容器

docker exec -it redis-6379 bash
$ cd /usr/local/bin/
$ redis-cli -a 123456 --cluster create 192.168.1.149:6379 192.168.1.149:6380 192.168.1.149:6381

输入yes后得到正确提示，此时redis-cluster搭建成功

>>> Performing hash slots allocation on 3 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
M: f76ffd50609346ab502562626a3ed9c3ad8eb280 192.168.1.149:6379
   slots:[0-5460] (5461 slots) master
M: f21515084bd905d64c27515233e0ec9fdd3ac64c 192.168.1.149:6380
   slots:[5461-10922] (5462 slots) master
M: 9e0aa1bf96fd22658741310e2e976d7ab9b40e2c 192.168.1.149:6381
   slots:[10923-16383] (5461 slots) master
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join

>>> Performing Cluster Check (using node 192.168.1.149:6379)
M: f76ffd50609346ab502562626a3ed9c3ad8eb280 192.168.1.149:6379
   slots:[0-5460] (5461 slots) master
M: f21515084bd905d64c27515233e0ec9fdd3ac64c 192.168.1.149:6380
   slots:[5461-10922] (5462 slots) master
M: 9e0aa1bf96fd22658741310e2e976d7ab9b40e2c 192.168.1.149:6381
   slots:[10923-16383] (5461 slots) master
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.