Docker-compose 未将依赖容器添加到 /etc/hosts

Question

未添加依赖主机名，这是我的 Web 应用程序连接到我的其他服务 (postgres) 所必需的

这是我/etc/hosts的一个例子

root@bdd6f863aced:/myapp# cat /etc/hosts
127.0.0.1       localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.21.0.3      bdd6f863aced

最后一个条目是当前容器，而不是 postgres 容器

重复步骤：

git clone repo git@github.com:tushartuteja/rails-docker-compose-example.git
cd rails-docker-compose-example
docker-compose up --build
docker ps # get the id for the web container
docker exec -it {host-container id} /bin/bash
rake db:create
cat /etc/hosts

当您尝试创建时，您会收到以下错误消息：

PG::ConnectionBad: could not translate host name "db" to address: Name or service not known
/usr/local/bundle/gems/pg-1.1.3/lib/pg.rb:56:in `initialize'
/usr/local/bundle/gems/pg-1.1.3/lib/pg.rb:56:in `new'
/usr/local/bundle/gems/pg-1.1.3/lib/pg.rb:56:in `connect'

docer-compose

version: '3'
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
  web:
    build: .
    volumes:
      - .:/myapp
    ports:
      - "3000:3000"
    depends_on:
      - db
    links:
      - db

此处的其他信息： https://github.com/docker/compose/issues/7442

Answer 1

我想你忘记了links 条目，这对你有帮助