docker-compose无法解析服务主机名 [英] docker-compose fails to resolve service hostname

问题描述

Docker文档说，可以使用服务名称相互访问同一撰写文件中的每个容器.除lb以外，这似乎适用于我所有的容器.

Docker documentation says that every container in the same compose file can be accessed from each other by using their service names. This seems to be working for all my containers except the lb.

version: "3"
services:
  lb:
    image: nginx
    volumes:
      - ./conf/nginx:/etc/nginx/conf.d/default.conf
    ports:
      - "8080:80"
    environment:
      - NGINX_HOST=foobar.com
      - NGINX_PORT=80
    stdin_open: true
    tty: true

  worker1:
    build: ./rel_sync_worker/.
    stdin_open: true
    tty: true
    depends_on :
      - broker
      - lb

  worker2:
    build: ./rel_sync_worker/.
    stdin_open: true
    tty: true
    depends_on :
      - broker
      - lb

  broker:
    build: ./broker/.
    ports:
      - "4444:4444/udp"
    stdin_open: true
    tty: true
    depends_on:
      - lb

broker1.py

broker1.py

import socket
host = socket.gethostbyname("broker")
print "broker", host
host = socket.gethostbyname("worker1")
print "worker1", host

host = socket.gethostbyname("lb")
# host = "127.0.0.1"
print host
port = 5555

broker1输出:

broker1 output:

broker_1   | broker 172.18.0.4
broker_1   | worker1 172.18.0.2
broker_1   | Traceback (most recent call last):
broker_1   |   File "sendertest.py", line 11, in <module>
broker_1   |     host = socket.gethostbyname("lb")
broker_1   | socket.gaierror: [Errno -2] Name or service not known

推荐答案

也许您应该为它们添加一个公共网络.

Maybe you should add them a common network.

version: "3"
services:
  lb:
    image: nginx
    volumes:
      - ./conf/nginx:/etc/nginx/conf.d/default.conf
    ports:
      - "8080:80"
    environment:
      - NGINX_HOST=foobar.com
      - NGINX_PORT=80
    stdin_open: true
    tty: true
    netwok:
      - common-network

  worker1:
    build: ./rel_sync_worker/.
    stdin_open: true
    tty: true
    depends_on :
      - broker
      - lb
    netwok:
      - common-network   

  worker2:
    build: ./rel_sync_worker/.
    stdin_open: true
    tty: true
    depends_on :
      - broker
      - lb

  broker:
    build: ./broker/.
    ports:
      - "4444:4444/udp"
    stdin_open: true
    tty: true
    depends_on:
      - lb
    netwok:

networks:
  common-netwok:
    driver: overlay

如果您的lb容器正在工作，我看不出还有什么可能给您带来这种问题，也许您的default.conf文件不正确.

I don't see what else could give you that kind of problem if your lb container is working ofc, maybe your default.conf file isn't correct.

希望有帮助.

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