Docker安装PHP 5.6时deb源404错误的解决办法

我要运行一个依赖PHP 5.6和MySQL 5.5的旧项目，搭建Docker环境时执行docker-compose出现错误。PHP 7.3版本能正常运行，但PHP 5.6无法安装。

错误信息 #

E: Failed to fetch http://deb.debian.org/debian/dists/stretch/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch http://deb.debian.org/debian/dists/stretch-updates/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch http://security.debian.org/debian-security/dists/stretch/updates/main/binary-amd64/Packages  404  Not Found [IP:151.101.130.132 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
ERROR: Service 'app' failed to build: The command '/bin/sh -c apt-get update && apt-get install -y         git .....' returned a non-zero code: 100

使用的配置文件 #

docker-compose.yml #

version: '2'
services:

# The Application
app:
   build:
  context: ./
  dockerfile: app.dockerfile
working_dir: /var/www
volumes:
  - ./public:/var/www
  - ./php.ini:/usr/local/etc/php/php.ini
environment:
  - "DB_PORT=3306"
  - "DB_HOST=database"

# The Web Server
web:
  build:
    context: ./
    dockerfile: web.dockerfile
  working_dir: /var/www
  volumes_from:
    - app
  ports:
    - 8080:80

# The Database
database:
    image: mysql:5.7-debian
  volumes:
    - dbdata:/var/lib/mysql
  environment:
    - "MYSQL_DATABASE=homestead"
    - "MYSQL_USER=homestead"
    - "MYSQL_PASSWORD=secret"
    - "MYSQL_ROOT_PASSWORD=secret"
  ports:
      - "33061:3306"

volumes:
  dbdata:

app.dockerfile #

FROM php:5.6.15-cli

 RUN apt-get update && apt-get install -y git zip unzip
 RUN docker-php-ext-install mysqli pdo pdo_mysql

 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

web.dockerfile #

FROM nginx:1.10

 ADD vhost.conf /etc/nginx/conf.d/default.conf

解决方案 #

1. 修复PHP镜像的软件源问题 #

php:5.6.15-cli基于Debian Stretch系统，该版本的官方源已被归档，无法正常访问。需要替换为归档源：

修改app.dockerfile为：

FROM php:5.6.15-cli

# 替换为Debian Stretch归档源
RUN sed -i 's/deb.debian.org/archive.debian.org/g' /etc/apt/sources.list && \
    sed -i 's/security.debian.org/archive.debian.org/g' /etc/apt/sources.list && \
    sed -i '/stretch-updates/d' /etc/apt/sources.list

RUN apt-get update && apt-get install -y git zip unzip
RUN docker-php-ext-install mysqli pdo pdo_mysql

RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

2. 匹配MySQL版本 #

当前配置使用mysql:5.7-debian，但项目依赖MySQL 5.5，需修改docker-compose.yml中数据库服务的镜像：

database:
    image: mysql:5.5

内容的提问来源于stack exchange，提问作者Jyothi