TimeoutError：[Errno 110]尝试在Docker中连接到Redis服务时，连接呼叫失败

Question

我正在将使用Django Channels用于websocket功能的Web应用程序进行docker化。这取决于redis。我无法让应用程序的redis部分正常工作。我尝试坚持[C0​​]。

this redis/compose guide

docker-compose.yml

version: "3"

services:
  db:
    image: mysql:latest
    volumes:
      - "./.mysql-data/db:/var/lib/mysql"
    restart: always
    ports:
      - 3306:3306
    environment:
      MYSQL_ROOT_PASSWORD: rootpassword
      MYSQL_DATABASE: database
      MYSQL_USER: user
      MYSQL_PASSWORD: password
    networks:
      - hostnetwork
  backend:
    build: ./backend
    command: daphne -b 0.0.0.0 -p 8000 main.asgi:application
    volumes:
      - ./backend:/code
    ports:
      - "8000:8000"
    depends_on:
      - db
    links:
      - redis
  redis:
    image: "redis:alpine"
    command: redis-server
    ports:
      - "6379:6379"
    volumes:
      - ./redis-data:/var/lib/redis <-- This dir doesn't exist on host machine
      - ./redis.conf:/usr/local/etc/redis/redis.conf <-- I created this file manually on host machine
    environment:
      - REDIS_REPLICATION_MODE=master
    networks:
      node_net:
        ipv4_address: 172.28.1.4
  frontend:
    build: ./frontend
    ports:
      - "3000:3000"
    volumes:
      - ./frontend:/usr/src/app
    stdin_open: true

networks:
  hostnetwork:
    external: true
  node_net:
    ipam:
      driver: default
      config:
        - subnet: 172.28.0.0/16

settings.py

使用以上配置，我的容器启动，并且redis最初不会出现任何错误，但是websocket使用者从未收到或发送任何消息。一分钟左右后，出现以下错误：

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "channels_redis.core.RedisChannelLayer",
        "CONFIG": {
            "hosts": [
                (os.environ.get('REDIS_HOST', "172.28.1.4"),
                 os.environ.get('REDIS_PORT', 6379))
            ],
        },
    },
}

是什么原因导致

backend_1   |   File "/usr/local/lib/python3.8/asyncio/selector_events.py", line 494, in sock_connect
backend_1   |     return await fut
backend_1   |   File "/usr/local/lib/python3.8/asyncio/selector_events.py", line 526, in _sock_connect_cb
backend_1   |     raise OSError(err, f'Connect call failed {address}')
backend_1   | TimeoutError: [Errno 110] Connect call failed ('172.28.1.4', 6379)

以及服务器和Redis之间显然缺乏通信？我如何让两个人说话？

Answer 1

此答案使我了解了解决问题所需的知识。我只是删除了：

TimeoutError

并将

    networks:
      node_net:
        ipv4_address: 172.28.1.4

更改为此：

CHANNEL_LAYERS

我想这使我的服务可以通过

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "channels_redis.core.RedisChannelLayer",
        "CONFIG": {
            "hosts": [
                (os.environ.get('REDIS_HOST', "redis"), <---
                 os.environ.get('REDIS_PORT', 6379))
            ],
        },
    },
}

创建的桥接网络进行通信。