Dockerfile制作能够ssh的ubuntu和centos7系统

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目录

一.制作ubuntu系统

1.Dockerfile内容如下

2.运行容器并验证 

二.制作centos7系统

1.Dockerfile内容如下

2.验证并测试

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一.制作ubuntu系统

要求：制作一个能够远程ssh的ubuntu操作系统镜像，要求通过该镜像运容器后，内部拥有一些自动补全、vim、网络插件等常用的软件包。

1.Dockerfile内容如下

[root@localhost docker]# cat Dockerfile 
FROM ubuntu
RUN apt-get update && apt-get install -y openssh-server vim net-tools iproute2 bash-completion
RUN mkdir -p /var/run/sshd && echo 'root:nihao' | chpasswd
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config && sed -i 's@session    required     pam_loginuid.so@session    optional     pam_loginuid.so@g' /etc/pam.d/sshd
ENTRYPOINT ["/usr/sbin/sshd", "-D"] 
EXPOSE 22 
[root@localhost docker]# docker build -t myubuntu ./
[root@localhost docker]# docker images | grep myubuntu
myubuntu     latest    dbcc4cc0f303   About a minute ago   300MB

2.运行容器并验证 

[root@localhost docker]# docker run --name myubuntu -p 2222:22 -d myubuntu
[root@localhost docker]# docker ps
CONTAINER ID   IMAGE      COMMAND               CREATED              STATUS              PORTS                                   NAMES
b055d6ecb26c   myubuntu   "/usr/sbin/sshd -D"   About a minute ago   Up About a minute   0.0.0.0:2222->22/tcp, :::2222->22/tcp   myubuntu
​
[C:\~]$ ssh 192.168.2.160:2222
​
​
Connecting to 192.168.2.160:2222...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
​
Welcome to Ubuntu 24.04 LTS (GNU/Linux 5.14.0-162.6.1.el9_1.x86_64 x86_64)
​* Documentation:  https://help.ubuntu.com* Management:     https://landscape.canonical.com* Support:        https://ubuntu.com/pro
​
This system has been minimized by removing packages and content that are
not required on a system that users do not log into.
​
To restore this content, you can run the 'unminimize' command.
Last login: Wed Jun  5 06:01:37 2024 from 192.168.2.2
root@b055d6ecb26c:~# 
root@b055d6ecb26c:~# ss -lntup | grep 22
tcp   LISTEN 0      128          0.0.0.0:22        0.0.0.0:*    users:(("sshd",pid=1,fd=3))
tcp   LISTEN 0      128             [::]:22           [::]:*    users:(("sshd",pid=1,fd=4))
root@b055d6ecb26c:~# netstat -anp | grep 22
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1/sshd: /usr/sbin/s 
tcp        0     52 172.17.0.2:22           192.168.2.2:57982       ESTABLISHED 49/sshd: root@pts/0 
tcp6       0      0 :::22                   :::*                    LISTEN      1/sshd: /usr/sbin/s 
root@b055d6ecb26c:~# service ssh status* sshd is running

二.制作centos7系统

 要求同制作ubuntu系统一样

只是在centos系统内下载好openssh后启动ssh会报错没有主机密钥，所以我们需要在Dockerfile中使用ssh-kengen -A生成主机密钥

Could not load host key: /etc/ssh/ssh_host_rsa_key

Could not load host key: /etc/ssh/ssh_host_ecdsa_key

Could not load host key: /etc/ssh/ssh_host_ed25519_key

sshd: no hostkeys available -- exiting.

1.Dockerfile内容如下

[root@localhost centos]# cat Dockerfile 
FROM centos:7
RUN yum install -y openssh-server vim net-tools  bash-completion
RUN mkdir -p /var/run/sshd && echo 'nihao' | passwd --stdin root && ssh-keygen -A
RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config && sed -i 's@session    required     pam_loginuid.so@session    optional     pam_loginuid.so@g' /etc/pam.d/sshd
ENTRYPOINT ["/usr/sbin/sshd", "-D"] 
EXPOSE 22 
[root@localhost centos]# docker build -t mycentos:7 ./
[root@localhost centos]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
mycentos     7         84f3511bdfb5   7 minutes ago   519MB
mytomcat     latest    c4d1c41c131b   18 hours ago    745MB
nginx        latest    e784f4560448   5 weeks ago     188MB
busybox      latest    65ad0d468eb1   13 months ago   4.26MB
tomcat       latest    fb5657adc892   2 years ago     680MB
centos       7         eeb6ee3f44bd   2 years ago     204MB
centos       latest    5d0da3dc9764   2 years ago     231MB
nginx        1.17.2    4733136e5c3c   4 years ago     126MB
[root@localhost centos]# docker run -it --name mycentos7 -p 2222:22 -d mycentos:7 
3bb789c6e2c973f2727dc8925de5f8847cf266eddb9a6510478d3015c2f01e6f
[root@localhost centos]# docker ps
CONTAINER ID   IMAGE        COMMAND               CREATED         STATUS         PORTS                                   NAMES
3bb789c6e2c9   mycentos:7   "/usr/sbin/sshd -D"   2 seconds ago   Up 2 seconds   0.0.0.0:2222->22/tcp, :::2222->22/tcp   mycentos7

2.验证并测试

[C:\~]$ ssh root@192.168.2.160:2222Connecting to 192.168.2.160:2222...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.Last failed login: Thu Jun 13 07:42:36 UTC 2024 from 192.168.2.2 on ssh:notty
There was 1 failed login attempt since the last successful login.

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