DevOps技术

[【原文链接】基于CentOS容器镜像制作可ssh登录的docker镜像](http://devops-dev.com/article/499)

（1）以centos：7.9.2009为例，首先以交互的方式启动容器
```bash
docker run -it --rm --privileged centos:7.9.2009 /bin/bash
```

（2）然后安装基础软件即ssh服务
```bash
yum install -y net-tools
yum install -y openssh-clients
yum install -y openssh-server
ssh-keygen -A
mkdir /var/run/sshd
echo 'root:Admin123456' |chpasswd
```

（3）然后启动sshd服务
```bash
/usr/sbin/sshd -D &
```

（4）然后将运行的容器生成镜像，这里 e4827a50c0ed 为容器id
```bash
docker commit e4827a50c0ed  redrose2100/centos-ssh:7.9.2009
```

（5）此时查看镜像，如下镜像已经生成。
```bash
[root@centos7-1 ~]# docker images | grep redrose2100
redrose2100/centos-ssh   7.9.2009    62b2d2fccae6   17 seconds ago   398MB
[root@centos7-1 ~]#
```

（6）将运行的容器退出，直接执行exit即可退出

（7）然后使用新生成的镜像启动容器
```bash
docker run -d --name=vm1 --privileged redrose2100/centos-ssh:7.9.2009 /usr/sbin/sshd -D
```

（8）此时查看容器，可以看到容器已经在后台运行
```bash
[root@centos7-1 openeuler]# docker ps
CONTAINER ID   IMAGE                             COMMAND               CREATED         STATUS         PORTS     NAMES
79d890184d34   redrose2100/centos-ssh:7.9.2009   "/usr/sbin/sshd -D"   5 seconds ago   Up 3 seconds             vm1
[root@centos7-1 openeuler]#
```

（9）然后通过docker exec 的方式进入容器，查看ip地址
```bash
[root@centos7-1 openeuler]# docker exec -it 79d890184d34 /bin/bash
[root@79d890184d34 /]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.2  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:ac:11:00:02  txqueuelen 0  (Ethernet)
        RX packets 8  bytes 656 (656.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@79d890184d34 /]#
```

（10）退出容器，然后通过ssh方式登录，如下可以登录
```bash
[root@centos7-1 openeuler]# ssh -o "StrictHostKeyChecking=no" root@172.17.0.2
root@172.17.0.2's password:
Last login: Mon Dec 12 07:15:44 2022 from 172.17.0.1
[root@79d890184d34 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.2  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:ac:11:00:02  txqueuelen 0  (Ethernet)
        RX packets 85  bytes 12046 (11.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 57  bytes 10094 (9.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@79d890184d34 ~]#
```

不积跬步，无以至千里

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