Docker容器通信-“无法翻译主机名\“ mydbalias\”解决：名称解析暂时失败 [英] Docker container communication - "Could not translate host name \"mydbalias\" to address: Temporary failure in name resolution"

问题描述

我有一个PostgreSQL容器和一个Swift服务器容器。我需要将DB IP传递给服务器以启动它。因此，我在自定义网桥网络中为数据库创建了别名。看看我的 docker-compose.yml

I have a PostgreSQL container and a Swift server container. I need to pass the DB IP to the Server to start it. So I created an alias for DB in my custom bridge network. Have a look at my docker-compose.yml

version: '3'

services:
    db:
      build: database
      image: postgres
      networks:
        mybridgenet:
          aliases:
            - mydbalias
    web:
      image: mywebserver:latest
      ports: 
        - "8000:8000"
      depends_on: 
        - db
      networks:
        - mybridgenet
      environment:
        WAIT_HOSTS: db:5432

networks:
  mybridgenet:
    driver: bridge

Dockerfile来构建网络服务器。

Dockerfile to build webserver.

FROM swift:4.2.1

RUN apt-get update && apt-get install --no-install-recommends -y libpq-dev uuid-dev  && rm -rf /var/lib/apt/lists/*
EXPOSE 8000
WORKDIR /app

COPY client ./client
COPY Package.swift ./
COPY Package.resolved ./

COPY Sources ./Sources
RUN swift build

COPY pkg-swift-deps.sh ./
RUN chmod +x ./pkg-swift-deps.sh
RUN ./pkg-swift-deps.sh ./.build/debug/bridgeOS

FROM busybox:glibc

COPY --from=0 /app/swift_libs.tar.gz /tmp/swift_libs.tar.gz
COPY --from=0 /app/.build/debug/bridgeOS /usr/bin/

RUN tar -xzvf /tmp/swift_libs.tar.gz && \
    rm -rf /tmp/*

ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.2.1/wait /wait
RUN chmod +x /wait

CMD /wait && mywebserver db "10.0.2.2"

数据库Dockerfile

Database Dockerfile

FROM postgres

COPY init.sql /docker-entrypoint-initdb.d/

服务器使用 mybinary mydbalias 启动。就像我之前说的，我通过别名来启动服务器。这样做时，出现以下错误。

The server is started using mybinary mydbalias. Like I said earlier, I pass the alias to start the server. While doing this, I get the following error.

消息：无法将主机名\ mydbalias\转换为地址：名称解析\n暂时失败

可能是什么问题？

更新

之后经过4天的艰苦突袭，我终于找到了老鼠。他是 busybox 容器。我将其更改为 ubuntu：16.04 ，这很容易。对整个难题感到非常高兴。谢谢大家的帮助。

After 4 days of a grueling raid, I finally found the rat. He is busybox container. I changed it to ubuntu:16.04 and it's a breeze. Feeling so good about this whole conundrum. Thanks, everyone who helped.

推荐答案

简化。不需要在您的显式网络声明（它由 docker-compose 自动完成，也无需别名（服务根据服务名称获取其主机名）

Simplify. There is no need in your explicit network declaration (it is done automatically by docker-compose, nor aliases (services get their host names based on service names)

docker-compose.yml

version: '3'
services:
    db:
      build: database
      image: postgres
    web:
      image: mywebserver:latest
      ports: 
        - "8000:8000"
      depends_on: 
        - db
      environment:
        WAIT_HOSTS: db:5432

然后只需使用 db 作为主机名即可从 web

Then just use db as a hostname to connect to database from web

这篇关于Docker容器通信-“无法翻译主机名\“ mydbalias\”解决：名称解析暂时失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！