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Dockerfile入门

如何构建自己的镜像?

Dockerfile介绍
Docker can build images automatically by reading the instructions from a Dockerfile. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. Using docker build users can create an automated build that executes several command-line instructions in succession.

Docker 可以通过读取 Dockerfile 中的指令自动构建镜像。 Dockerfile 是一个文本文档,其中包含用户可以在命令行上调用以组合镜像的所有命令。 使用 docker build 用户可以创建一个连续执行多个命令行指令的自动构建。该生成连续执行多个命令行的指令

Dockerfile是用来构建镜像的命令行文本文件
如何使用dockerfile:
1;编写一个dockerfile命令行文件
2;docker build -t tag -f . 构建一个镜像
3;docker run 运行镜像
4;docker push 发布镜像 {docker hub} 官方仓库或者第三方仓库
搜索镜像 ubuntu ,打开dockerfile links下任意版本一个连接 ,进入github
Dockerfile入门

参考官方编写的dockerfile文件

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FROM scratch
ADD ubuntu-bionic-core-cloudimg-amd64-root.tar.gz /

# a few minor docker-specific tweaks
# see https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap
RUN set -xe \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L40-L48
    && echo '#!/bin/sh' > /usr/sbin/policy-rc.d \
    && echo 'exit 101' >> /usr/sbin/policy-rc.d \
    && chmod +x /usr/sbin/policy-rc.d \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L54-L56
    && dpkg-divert --local --rename --add /sbin/initctl \
    && cp -a /usr/sbin/policy-rc.d /sbin/initctl \
    && sed -i 's/^exit.*/exit 0/' /sbin/initctl \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L71-L78
    && echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L85-L105
    && echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/docker-clean \
    && echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/docker-clean \
    && echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/docker-clean \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L109-L115
    && echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/docker-no-languages \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L118-L130
    && echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > /etc/apt/apt.conf.d/docker-gzip-indexes \
    \
# https://github.com/docker/docker/blob/9a9fc01af8fb5d98b8eec0740716226fadb3735c/contrib/mkimage/debootstrap#L134-L151
    && echo 'Apt::AutoRemove::SuggestsImportant "false";' > /etc/apt/apt.conf.d/docker-autoremove-suggests

# verify that the APT lists files do not exist
RUN [ -z "$(apt-get indextargets)" ]
# (see https://bugs.launchpad.net/cloud-images/+bug/1699913)

# make systemd-detect-virt return "docker"
# See: https://github.com/systemd/systemd/blob/aa0c34279ee40bce2f9681b496922dedbadfca19/src/basic/virt.c#L434
RUN mkdir -p /run/systemd && echo 'docker' > /run/systemd/container

CMD ["/bin/bash"]
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