Docker自制CentOS镜像

系统环境：CentOS 7.3

将yum源切换到阿里源

可以直接写成一个脚本

#!/bin/sh
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

1. 安装Docker

[[email protected] ~]# yum -y install docker-engine
[[email protected] ~]# systemctl start docker
[[email protected] ~]# systemctl enable docker

2. 安装制作CentOS镜像的工具

[[email protected] ~]# yum -y install febootstrap

ps： CentOS7中的yum源没有febootstrap包，可以在CentOS6中使用 "yumdownloader febootstrap"命令将febootstrap下载到本地，之后放在7上进行安装

3. 制作CentOS镜像文件centos6-image目录

febootstrap -i bash -i wget -i yum -i iputils -i iproute -i man -i vim-minimal -i openssh-server -i openssh-clients centos6 centos6-image http://mirrors.aliyun.com/centos/6/os/x86_64/

PS：-i 安装package， centos6 操作系统版本，centos6-doc安装目录，最后是源地址

4. 制作Docker镜像，镜像名字是centos6-base

cd centos6-image && tar -c .|docker import - centos6-base

制作可以ssh登陆的Docker镜像，名字是centos6-ssh

1.创建一个Dockerfile文件

#Dockerfile
FROM centos6-base
RUN ssh-keygen -q -N "" -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN ssh-keygen -q -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN sed -ri ‘s/session    required     pam_loginuid.so/#session    required     pam_loginuid.so/g‘ /etc/pam.d/sshd
RUN mkdir -p /root/.ssh && chown root.root /root && chmod 700 /root/.ssh
EXPOSE 22
RUN echo ‘root:123.com‘ | chpasswd
ENV LANG en_US.UTF-8
ENV LC_ALL en_US.UTF-8
CMD /usr/sbin/sshd -D
#End

Dockerfile

[[email protected] ~]# docker build -t centos6-ssh .

2.  创建容器

[[email protected] ~]# docker run -itd -p 33301:22 centos6-ssh

3. ssh登陆容器

[[email protected] ~]# ssh [email protected]127.0.0.1 -p 33301