[系统运维]Linux学习--Docker实现CentOS7添加SSH

查看本地镜像仓库

[root@docker ~]# docker image ls
REPOSITORY        TAG       IMAGE ID       CREATED        SIZE
centos            6.10      f1af727749c4   4 weeks ago    194MB
centos            7         eeb6ee3f44bd   4 weeks ago    204MB
centos            latest    5d0da3dc9764   4 weeks ago    231MB
nginx             1.14      295c7be07902   2 years ago    109MB
ubuntu            15.10     9b9cb95443b5   5 years ago    137MB

使用CentOS7镜像启动容器

#通过CentOS7镜像启动容器
[root@docker ~]# docker container run -it --name="centos7_sshd" centos:7
#查看CentOS版本
[root@cf6418a83218 /]# cat /etc/redhat-release 
CentOS Linux release 7.9.2009 (Core)
#配置本地yum源
[root@cf6418a83218 /]# cd /etc/yum.repos.d/
CentOS-CR.repo    CentOS-Media.repo      CentOS-Vault.repo    CentOS-x86_64-kernel.repo
[root@cf6418a83218 yum.repos.d]# mkdir bak
[root@cf6418a83218 yum.repos.d]# mv *.repo bak/
#注：需要在宿主机(192.168.88.101)上安装vsftp软件，并启动服务，将CentOS7的本地iso文件挂载到/var/ftp/centos7目录下
[root@cf6418a83218 yum.repos.d]# vi local.repo
[local]
name = linuxbase
baseurl = ftp://192.168.88.101/centos7
gpgcheck = 0
enabled = 1
[root@cf6418a83218 yum.repos.d]# yum makecache
#安装ssh服务端程序
[root@cf6418a83218 yum.repos.d]# yum install -y openssh-server
#ssh服务初使化操作
[root@cf6418a83218 yum.repos.d]# mkdir /var/run/sshd
[root@cf6418a83218 yum.repos.d]# echo 'UseDNS no' >> /etc/ssh/sshd_config
[root@cf6418a83218 yum.repos.d]# sed -i -e '/pam_loginuid.so/d' /etc/pam.d/sshd
[root@cf6418a83218 yum.repos.d]# echo 'root:123456' | chpasswd
[root@cf6418a83218 yum.repos.d]# /usr/bin/ssh-keygen -A
ssh-keygen: generating new host keys: RSA1 RSA DSA ECDSA ED25519 

制作第一版镜像

[root@docker ~]# docker commit cf6418a83218 tye/centos7_sshd:v1
sha256:356d2ac088cefd18805914e69e07821fa6b98ae423b30f9ca776fadbc54d26c4
[root@docker ~]# docker image ls
REPOSITORY         TAG       IMAGE ID       CREATED          SIZE
tye/centos7_sshd   v1        356d2ac088ce   17 seconds ago   285MB
centos             6.10      f1af727749c4   4 weeks ago      194MB
centos             7         eeb6ee3f44bd   4 weeks ago      204MB
centos             latest    5d0da3dc9764   4 weeks ago      231MB
nginx              1.14      295c7be07902   2 years ago      109MB
ubuntu             15.10     9b9cb95443b5   5 years ago      137MB

通过新创建的镜像启动一个容器实例

[root@docker ~]# docker container run -d --name="centos7_sshd_new" -p 2222:22 tye/centos7_sshd:v1 /usr/sbin/sshd -D
3c9429c6574c66054a48e006112b03a650d7b2dbdadebac65dee38981356af50
[root@docker ~]# docker container ls
CONTAINER ID   IMAGE                 COMMAND               CREATED          STATUS          PORTS                                   NAMES
3c9429c6574c   tye/centos7_sshd:v1   "/usr/sbin/sshd -D"   4 seconds ago    Up 3 seconds    0.0.0.0:2222->22/tcp, :::2222->22/tcp   centos7_sshd_new

通过ssh连接测试

[C:\~]$ ssh 192.168.88.101 2222
Connecting to 192.168.88.101:2222...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
WARNING! The remote SSH server rejected X11 forwarding request.
# 连接成功
[root@3c9429c6574c ~]#