构建阿里云的centos7-docker镜像

最近在项目中需要测试运维脚本，但是在网上都找不到可以模拟阿里云的centos7镜像，所以就自己构建了一个，跟大家分享下。

---

构建平台：

• 操作系统 window 11
• 软件 docker desktop

工作目录：

CentOS-Base.repo

[base]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

epel.repo

[epel]
name=Extra Packages for Enterprise Linux 7 - $basearch
enabled=1
failovermethod=priority
baseurl=http://mirrors.aliyun.com/epel/7/$basearch
gpgcheck=0
gpgkey=http://mirrors.aliyun.com/epel/RPM-GPG-KEY-EPEL-7

dockerfile

FROM centos:7 
COPY ./config /etc/yum.repos.d/
RUN yum clean all && \
    yum makecache && \
    yum install -y openssh-server openssh-clients  && \
    echo "PubkeyAuthentication yes" >> /etc/ssh/sshd_config && \
    ssh-keygen -q -t rsa -N '' -f /root/.ssh/id_rsa -b 4096 && \
    echo "<<id_rsa.pub>>" >> /root/.ssh/authorized_keys
CMD [ "/usr/sbin/init" ]

构建方法：

在当前目录下下执行(别忘了最后还有一个.)

docker build -t centos:ali .

这个镜像是可以开启了ssh访问，可以将<<id_rsa.pub>>替换成运维服务器上的ssh-key。镜像大小约1.24G，可以根据需要安装需要的环境，如python3等。