一、基于commit命令方式创建
- docker的安装
[root@test01 ~]# yum install docker
[root@test01 ~]# systemctl enable docker
[root@test01 ~]# systemctl start docker
- 下载本地镜像
使用docker run命令时，Docker会自动的先查找本地的镜像，如果没有找到，会继续向docker hub上查找并下载。我习惯先下载下来
docker pull centos 默认本系统版本的最新版，如果指定版本，加上冒号和版本号
[root@test01 ~]# docker pull centos:7.4.1708
[root@test01 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos 7.4.1708 3afd47092a0e 3 months ago 196.6 MB
- 创建交互型容器
[root@test01 ~]# docker run -it --name="ssh_server" centos:7.4.1708 /bin/bash
[root@ffe61e183a6c /]#
- 安装必要的服务
通过yum安装，检查yum源配置是否正确，centos7的默认和主机的一样
yum install openssh-server 安装ssh服务程序
yum install net-tools 安装网络工具，用来查看端口，可不安装
[root@ffe61e183a6c /]# yum install openssh-server net-tools
- 配置sshserver服务
使用ssh-keygen生成必要的密钥
[root@ffe61e183a6c /]# ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
[root@ffe61e183a6c /]# ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
[root@ffe61e183a6c /]# ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key
- 启动ssh服务器，并查看是否启动成功
/usr/sbin/sshd -D &
此处的-D参数用于告诉SSH服务不以守护进程运行，而是和运行终端关联，有了运行终端，容器就不会退出
[root@ffe61e183a6c /]# /usr/sbin/sshd -D &
[1] 82
[root@ffe61e183a6c /]# netstat -tunpla
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 82/sshd
tcp6 0 0 :::22 :::* LISTEN 82/sshd
[root@ffe61e183a6c /]# pkill sshd
- 编写SSH运行脚本
至此，我们可以证实ssh服务启动没有问题，接下来我们编写启动脚本，用于启动容器的时候运行，因为容器启动时只能运行一个命令，一般这个命令用来启动脚本
[root@ffe61e183a6c ~]# cat run.sh
#!/bin/bash
/usr/sbin/sshd -D
[root@ffe61e183a6c ~]# chmod 775 run.sh
- 提交生成的镜像
使用docker commit将刚才的容器提交为一个新的镜像
[root@ffe61e183a6c ~]# exit
exit
[root@test01 ~]#
[root@test01 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ffe61e183a6c centos:7.4.1708 "/bin/bash" 19 minutes ago Exited (0) 8 seconds ago ssh_server
[root@test01 ~]# docker commit ffe61e183a6c ssh:commit
sha256:be55c135e6141481aff3218b7a269b27d8f0faa295ed244849bf8ccf7ad1c7b1
[root@test01 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
ssh commit be55c135e614 11 seconds ago 296.5 MB
docker.io/centos 7.4.1708 3afd47092a0e 3 months ago 196.6 MB
- 启动镜像
[root@test01 ~]# docker run -d -p 2022:22 ssh:commit /root/run.sh
6d5628a2a336bc302fa45baf6e6a1d5ade2f6dd42a4697553c6e3dda1a0a3226
[root@test01 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6d5628a2a336 ssh:commit "/root/run.sh" 8 seconds ago Up 6 seconds 0.0.0.0:2022->22/tcp prickly_bell
- 补漏
刚才忘记给docker镜像设置密码了，这次需要给设置一下密码
[root@test01 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6d5628a2a336 ssh:commit "/root/run.sh" 6 minutes ago Exited (137) 4 minutes ago prickly_bell
ffe61e183a6c centos:7.4.1708 "/bin/bash" 29 minutes ago Exited (0) 9 minutes ago ssh_server
[root@test01 ~]# docker run -it ssh:commit /bin/bash
[root@0204e7257a24 /]# passwd root
Changing password for user root.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@0204e7257a24 /]# exit
exit
[root@test01 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0204e7257a24 ssh:commit "/bin/bash" 29 seconds ago Exited (0) 4 seconds ago trusting_borg
6d5628a2a336 ssh:commit "/root/run.sh" 9 minutes ago Exited (137) 7 minutes ago prickly_bell
ffe61e183a6c centos:7.4.1708 "/bin/bash" 32 minutes ago Exited (0) 12 minutes ago ssh_server
[root@test01 ~]# docker commit 0204e7257a24 ssh02:commit
sha256:b92a3cde4c9162cf12ac9cf61a61ce0332d3755b7708e4037c4df09b4e794177
- 再次启动需改后的镜像
[root@test01 ~]# docker run -d -p 2022:22 ssh02:commit /root/run.sh
357ed4074c5d7f1ec1fe0df6af9c9a3162c70fa5624f7742bf59f309d9842247
- 验证是否成功
[root@test01 ~]# ssh root@192.168.1.60 -p2022
root@192.168.1.60's password:
[root@357ed4074c5d ~]# exit
[root@test01 ~]# docker stop 357ed4074c5d
二、基于Dockerfile方式创建
- 准备文件
创建一个存放生成镜像相关文件的目录
该目录下需要创建2个文件：Dockerfile、run.sh。Dockerfile用于构建镜像，run.sh是启动SSH服务的脚本
mkdir ssh_dockerfile && cd ssh_dockerfile
- 编写Dockerfile、run.sh
[root@test01 ssh_dockerfile]# cat Dockerfile
#使用的基础镜像
FROM centos:7.4.1708
#添加作者信息
MAINTAINER liuxin 842887233@qq.com
#安装SSH服务
RUN yum install -y openssh-server
#添加必要的密钥
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
RUN ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key
#添加启动文件
ADD run.sh /root/run.sh
RUN chmod 775 /root/run.sh
#导出端口
EXPOSE 22
#设置默认启动命令
CMD ["/root/run.sh"]
[root@test01 ssh_dockerfile]# cat run.sh
#!/bin/bash
/usr/sbin/sshd -D
- 创建镜像
[root@test01 ssh_dockerfile]# docker build ./
Sending build context to Docker daemon 3.072 kB
Step 1 : FROM centos:7.4.1708
---> 3afd47092a0e
Step 2 : MAINTAINER liuxin 842887233@qq.com
---> Using cache
---> bd64810df0bc
Step 3 : RUN yum install -y openssh-server
---> Using cache
---> 5dc6301a0304
Step 4 : RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
---> Using cache
---> 0ce92e5baa9f
Step 5 : RUN ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
---> Using cache
---> fcb2bcf78ea0
Step 6 : RUN ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key
---> Using cache
---> 7eae01e47ee2
Step 7 : ADD run.sh /root/run.sh
---> 4d07a723ffcf
Removing intermediate container 0b137a9274be
Step 8 : RUN chmod 775 /root/run.sh
---> Running in 1d5a9524da86
---> 324868eb5780
Removing intermediate container 1d5a9524da86
Step 9 : EXPOSE 22
---> Running in ada62bb87978
---> a0b3df156e21
Removing intermediate container ada62bb87978
Step 10 : CMD /root/run.sh
---> Running in 4f5031577ff4
---> 8679c00088ef
Removing intermediate container 4f5031577ff4
Successfully built 8679c00088ef
[root@test01 ssh_dockerfile]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
<none> <none> 8679c00088ef About a minute ago 295.9 MB
ssh02 commit b92a3cde4c91 55 minutes ago 296.5 MB
ssh commit be55c135e614 About an hour ago 296.5 MB
docker.io/centos 7.4.1708 3afd47092a0e 3 months ago 196.6 MB
- 运行镜像
[root@test01 ssh_dockerfile]# docker run -d -p 2022:22 8679c00088ef
e73a441afc8df35f42a30974c8697278fe6d35c1ac711d13ec817e74ffbf4008
[root@test01 ssh_dockerfile]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
e73a441afc8d 8679c00088ef "/root/run.sh" 14 seconds ago Up 12 seconds 0.0.0.0:2022->22/tcp fervent_yonath
- 遗漏
又忘记设密码了，有兴趣的朋友自行更改吧
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