容器基础镜像构建

构建基础的 rootfs —> 配置基础系统参数 —> 部署用户自定义软件 —> 清理系统 —> 打包为容器镜像 —> 测试镜像 —> 发布仓库

https://docs.docker.com/develop/develop-images/baseimages/

一、Ubuntu

1、安装 debootstrap

apt install -y debootstrap

2、创建 rootfs 存放位置

mkdir -p /opt/diros
cd /opt/diros

3、构建基础 Ubuntu 20.10 groovy 的 rootfs

debootstrap --verbose --arch=amd64 groovy /opt/diros http://mirrors.aliyun.com/ubuntu
#debootstrap --verbose --arch=amd64 bionic /opt/diros https://mirrors.tuna.tsinghua.edu.cn/ubuntu

4、配置基础系统参数

chroot /opt/diros/ /bin/bash

apt update
apt upgrade
apt -y install vim locales

dpkg-reconfigure locales
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

tee /etc/lsb-release <<-'EOF'
ID=Intewell
NAME="Intewell-Linux"
VERSION=""
VERSION_ID=
EOF

rm -rf /tmp/*
apt clean

exit

5、打包并创建 docker 镜像

tar -C /opt/diros/ -cv . | docker import - diros

#tar --numeric-owner --exclude=/proc --exclude=/sys --exclude=/diros.tar -cvf diros.tar /
tar --numeric-owner --exclude=/proc --exclude=/sys -cvf diros.tar /
cat diros.tar | docker import - diros

tar --numeric-owner --exclude=/proc --exclude=/sys -C / -cv . | docker import - diros

6、测试

docker run diros cat /etc/lsb-release

二、Centos

1、下载 moby

git clone https://github.com/moby/moby

#git checkout 20.10
cd moby/contrib/

2、构建

./mkimage-yum.sh centos

docker images

三、FROM scratch

mkdir /opt/tmp
cd /opt/tmp

vim Dockerfile

FROM scratch
ADD hello /
CMD ["/hello"]

wget https://raw.githubusercontent.com/docker-library/hello-world/master/hello.c

docker run --rm -it -v $PWD:/build ubuntu:16.04
container# apt-get update && apt-get install -y build-essential
container# cd /build
container# gcc -o hello -static -nostartfiles hello.c

docker build --tag hello .

docker run --rm hello

四、多阶段编译

vim Dockerfile

FROM ubuntu:16.04 AS buildstage
RUN apt update && apt install -y build-essential wget && \
    wget https://raw.githubusercontent.com/docker-library/hello-world/master/hello.c && \
    gcc -o hello -static -nostartfiles hello.c

FROM scratch
COPY --from=buildstage hello /
CMD ["/hello"]

docker build --tag hello .

五、buildah

https://github.com/containers/buildah/blob/master/docs/buildah-push.md

apt install -y buildah
yum install -y buildah

buildah images

vim Dockerfile

FROM ubuntu:16.04 AS buildstage
RUN apt update && apt install -y build-essential wget && \
    wget https://raw.githubusercontent.com/docker-library/hello-world/master/hello.c && \
    gcc -o hello -static -nostartfiles hello.c

FROM scratch
COPY --from=buildstage hello /
CMD ["/hello"]

buildah bud -t test:latest ./

buildah push cbd1566b3bbb dir:./b

buildah push cbd1566b3bbb docker-archive:./b.tar