从零制作一个ubuntu的docker镜像

上次分享了一下怎么制作centos的镜像，今天给大家分享一下ubuntu的制作方法。

准备ubuntu环境

        如果你有Ubuntu环境的话最好，可以直接打包，我用的是CentOS系统，所以需要借助debootstrap工具。

yum -y install epel-release
yum -y install debootstrap

mkdir ~/ubuntu-root
debootstrap --arch=amd64 focal ~/ubuntu-root http://archive.ubuntu.com/ubuntu/

[root@bogon ]# ls ~/ubuntu-root/
bin   dev  home  lib32  libx32  mnt  proc  run   srv  tmp  var
boot  etc  lib   lib64  media   opt  root  sbin  sys  usr

制作ubuntu镜像

mkdir ubuntu
cd ubuntu
mv ~/ubuntu-root .

cat > Dockerfile < [internal] load build definition from Dockerfile                           0.0s
 => => transferring dockerfile: 87B                                            0.0s
 => [internal] load .dockerignore                                              0.0s
 => => transferring context: 2B                                                0.0s
 => [internal] load build context                                              0.3s
 => => transferring context: 1.08MB                                            0.3s
 => CACHED [1/1] ADD ubuntu-root/ /                                            0.0s
 => exporting to image                                                         0.0s
 => => exporting layers                                                        0.0s
 => => writing image sha256:80026197be11ccce07f1be9707d39540bc4fda056b6119d6d  0.0s
 => => naming to docker.io/library/ubuntu                                      0.0s

测试

[root@bogon ~]# docker run -it --rm ubuntu bash
root@25befe3b3054:/#