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: Dockerfilerun.shDockerfile 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 Dockerfilerun.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
来源: http://www.jianshu.com/p/6fa95bc4a9a7