Docker自制镜像-CentOS7

Docker自制镜像-CentOS7

源镜像:https://github.com/CentOS/sig-cloud-instance-images/blob/2cd93d6632e5476306240ce66a7a1ff929a6997f/docker/Dockerfile

改动:

docker run -it -d --privileged --name centos_t1 centos:latest
docker commit --change='CMD ["/usr/sbin/init"]' centos_t1 centos7_cv1
docker run -it -d --privileged --name centos_t2 centos7_cv1
docker exec -it centos_t2 /bin/bash
yum update
yum install -y vim wget epel-release net-tools iproute lrzsz nano iftop bind-utils traceroute git zsh openssh-server screen NetworkManager-tui
yum group install "Development Tools"
systemctl daemon-reload
vim /etc/ssh/sshd_config 
systemctl start sshd.service
systemctl enable sshd.service

yum install iptables-services
vim /etc/sysconfig/iptables
systemctl restart iptables.service
systemctl enable iptables.service

passwd
vim /etc/profile

在特权模式下,亲测systemd可用。

原来之前systemd无法执行只是dbus没有启动而已,难怪官方的dockerfile不能用,但是报错提示PID 1被抢占也一直引导我没有去尝试换一个方式,直到今天才算解决。

对于生产环境,建议重新生成SSH的私钥和公钥,具体命令如下:

  ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
  ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key