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docker镜像的生成

父镜像与build配置文件

  • Dockerfile中的FROM语句

  • HomeAssistant基础镜像

    https://github.com/home-assistant/docker-base#home-assistant-base-../images

  • build.(json/yaml/yml)文件

    {
  "build_from": {
    "armhf": "homeassistant/armhf-base-python:latest",
    "armv7": "homeassistant/armv7-base-python:latest",
    "aarch64": "homeassistant/aarch64-base-python:latest",
    "amd64": "homeassistant/amd64-base-python:latest",
    "i386": "homeassistant/i386-base-python:latest"
  }
}
    • build文件可以使用json格式，也可以使用yaml格式
    • 如果只是从homeassistant/xxxxx-base:latest构建镜像的，可以不需要build配置文件
    • Dockerfile中以下语句保持不变
      ARG BUILD_FROM
FROM $BUILD_FROM

样例：运行WEB服务

本样例使用python3中提供的http.server，开启一个WEB服务器。

  • build.json

    {
  "build_from": {
    "armhf": "homeassistant/armhf-base-python:latest",
    "armv7": "homeassistant/armv7-base-python:latest",
    "aarch64": "homeassistant/aarch64-base-python:latest",
    "amd64": "homeassistant/amd64-base-python:latest",
    "i386": "homeassistant/i386-base-python:latest"
  }
}

  • Dockerfile

    ARG BUILD_FROM
FROM $BUILD_FROM

CMD python3 -m http.server --directory / 8000

  • config.json

    {
  "name": "A Simple Web Server",
  "version": "1.0.0",
  "slug": "a_simple_web_server",
  "description": "This is a web server using python's http.server",
  "arch": ["armhf", "armv7", "aarch64", "amd64", "i386"]
}

替代方案：apk安装

  • 删除build.json

  • Dockerfile

    ARG BUILD_FROM
FROM $BUILD_FROM

#RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
RUN apk add --no-cache python3

CMD python3 -m http.server --directory / 8000

  • 如何事先测试Dockerfile中RUN命令的正确性？

    可以构建一个上个视频中演示的简单add-on，然后使用docker exec命令登录到其中，测试各种命令的准确与有效性。

基础镜像中的三个工具

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