1. 安装CentOS 7.x

  1. 略。

2. 安装docker

详见： How to Install Docker on CentOS 6.x

3. 基础docker命令

  1. ＃ 获取centos6 docker镜像
  2. [root@docker ~]# docker pull centos6
  3. Using default tag: latest
  4. latest: Pulling from library/centos:centos6
  6. 43db9dbdcb30: Downloading 41.14 MB/49.33 MB
  7. 43db9dbdcb30: Pull complete
  8. 2dc64e8f8d4f: Pull complete
  9. 670a583e1b50: Pull complete
  10. 183b0bfcd10e: Pull complete
  11. Digest: sha256:c6674c44c6439673bf56536c1a15916639c47ea04c3d6296c5df938add67b54b
  12. Status: Downloaded newer image for centso:centos6
  14. ＃ 查看当前服务器上的docker镜像
  15. [root@docker ~]# docker images
  16. REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  17. centos6-visionet    latest              aeed37612ecb        6 hours ago         1.916 GB
  18. centos              centos6             a3c09d36ab4a        2 days ago          194.6 MB
  19. registry            latest              c6c14b3960bd        3 days ago          33.28 MB
  20. ＃ 查找docker镜像
  21. [root@docker ~]# docker search centos:centos6
  22. NAME                                     DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
  23. imagine10255/centos6-lnmp-php56          centos6-lnmp-php56                              10                   [OK]
  24. lemonbar/centos6-ssh                     Installed openssh-server on centos6, defau...   7                    [OK]
  25. sergeyzh/centos6-nginx                                                                   2                    [OK]
  26. guyton/centos6                           From official centos6 container with full ...   2                    [OK]
  27. paijp/centos6-apache-php-sqlite2         php5.3.3 with sqlite2 and apache on CentOS...   1                    [OK]
  28. edrans/centos6                                                                           1                    [OK]
  29. mohri1219/centos6.7-ruby2.2.2-mysql5.6   centos6.7-ruby2.2.2-mysql5.6                    1                    [OK]
  30. ...
  31. ...
  33. ＃ 删除 centos6 docker镜像
  34. [root@docker ~]# docker rmi IMAGES_NAME
  35. [root@docker ~]# docker rmi centos:centos6
  36. # 报错无法删除
  37. Error response from daemon: conflict: unable to remove repository reference "centos" (must force) - container 705a30cbc002 is using its referenced image 42118e3df429
  38. # 这是因为之间的运行的进程没有清楚导致该images正在使用中，使用一下命令查看占有的进程
  39. [root@docker ~]# docker ps -a ＃ 查看所有的docker进程
  40. CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS                     PORTS               NAMES
  41. 705a30cbc002        centos:centos6              "/bin/bash"           6 minutes ago       Exited (0) 6 minutes ago                       centos6
  42. [root@docker ~]# docker rm 705a30cbc002
  43. 705a30cbc002
  44. [root@docker ~]# docker rmi centos:centos6
  45. Untagged: centos:centos6
  46. Deleted: sha256:42118e3df429f09ca581a9deb3df274601930e428e452f7e4e9f1833c56a100a
  47. Deleted: sha256:d72d0199021776e77ac14a764a3decd156e9f6f18b37e25b867b0f1ca42fb3d9
  48. Deleted: sha256:fb178c6cea1453d089ce033b96eba0efdb42274138e042517ea2d5ea7bb51665
  49. Deleted: sha256:8945af30572845a904adce2aeaf73402c842d86e99e8f10688b25cb27834110b
  50. Deleted: sha256:ea9f151abb7e06353e73172dad421235611d4f6d0560ec95db26e0dc240642c1

4. 运行一个docker镜像

进入交互式程序

  1. [root@docker ~]# docker run  -it centos:centos6 /bin/bash
  2. [root@c1d190f95562 /]# cat /etc/redhat-release
  3. CentOS release 6.8 (Final)
  4. # Install openssh-server and httpd
  5. root@d8c122dbe09d:/# yum install -y openssh-sever httpd
  6. root@d8c122dbe09d:/# exit
  8. # 注意当你执行exit，从容器之中退出时，容器也会随着关闭，这时如果还继续执行上条命令
  9. # 你会发现之前所有的操作都被还原，因为相对于docker，又是新开了一个进程
  10. # 在exit退出之后，使用一下命令查看上次提交，然后commit修改，便可保存之前的修改
  12. [root@docker ~]# docker ps -l
  13. [root@docker ~]# docker commit c1d190f95562 centos:centos6-httpd
  14. sha256:77eb12e36c7bbe9ef874555b1873019022b5258740aa731627e2cd6fa749c325
  15. [root@docker ~]# docker images
  16. REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  17. centos              centos6-httpd       77eb12e36c7b        3 seconds ago       290.3 MB
  18. centos6-visionet    latest              aeed37612ecb        6 hours ago         1.916 GB
  19. centos              centos6             a3c09d36ab4a        2 days ago          194.6 MB
  20. registry            latest              c6c14b3960bd        3 days ago          33.28 MB

5. 编辑Dockerfile

  1. # dockfile的第一行一定是FROM，指定了父镜像
  2. FROM centos:centos6
  4. # RUN 指的是运行的命令
  5. RUN yum install -y epel-release
  6. RUN yum install -y bash-completion
  7. RUN yum install -y openssh-server openssh-client sudo
  8. RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config
  9. RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
  11. # 增加一个用户，并赋予sudo权限
  12. RUN useradd visionet
  13. RUN echo "visionet:visionet" | chpasswd
  14. RUN echo "visionet   ALL=(ALL)       ALL" >> /etc/sudoers
  16. ＃ 注意，如果没有执行一下两个命令，sshd是无法远程登陆的
  17. RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
  18. RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
  20. ＃ EXPOSE 22， 将22端口暴露出来，方便ssh远程连接
  21. RUN mkdir /var/run/sshd
  22. EXPOSE 22
  23. ＃ CMD 为系统内部执行命令
  24. CMD ["/usr/sbin/sshd", "-D"]

6. 生成自定义docker镜像

  1. # build 编译镜像
  2. [root@docker ~]# docker build -f dockerfile3 -t centos:centos6-ssh .
  3. Sending build context to Docker daemon 44.54 kB
  4. Step 1 : FROM centos:centos6
  5.  ---> a3c09d36ab4a
  6. Step 2 : RUN yum install -y epel-release
  7.  ---> Using cache
  8.  ---> 04d81f280a63
  9. Step 3 : RUN yum install -y bash-completion
  10.  ---> Using cache
  11.  ---> 5ca26894dc9d
  12. Step 4 : RUN yum install -y openssh-server openssh-client sudo
  13.  ---> Using cache
  14.  ---> 42278450311e
  15. Step 5 : RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config
  16.  ---> Using cache
  17.  ---> db35bef562a2
  18. Step 6 : RUN cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
  19.  ---> Using cache
  20.  ---> dc9f2b82e198
  21. Step 7 : RUN useradd visionet
  22.  ---> Using cache
  23.  ---> 06c574a51755
  24. Step 8 : RUN echo "visionet:visionet" | chpasswd
  25.  ---> Using cache
  26.  ---> 03412f053d04
  27. Step 9 : RUN echo "visionet   ALL=(ALL)       ALL" >> /etc/sudoers
  28.  ---> Using cache
  29.  ---> bf8476812a62
  30. Step 10 : RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
  31.  ---> Using cache
  32.  ---> 2314cce75171
  33. Step 11 : RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
  34.  ---> Using cache
  35.  ---> 99304cd9ac15
  36. Step 12 : RUN mkdir /var/run/sshd
  37.  ---> Using cache
  38.  ---> f87283751553
  39. Step 13 : EXPOSE 22
  40.  ---> Using cache
  41.  ---> 56c41202dcb9
  42. Step 14 : CMD /usr/sbin/sshd -D
  43.  ---> Using cache
  44.  ---> d6dccb483fa6
  45. Successfully built d6dccb483fa6
  46. [root@docker ~]# docker images
  47. REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  48. centos              centos6-ssh         d6dccb483fa6        2 minutes ago         363 MB
  49. centos              centos6-httpd       77eb12e36c7b        6 minutes ago       290.3 MB
  50. centos6-visionet    latest              aeed37612ecb        6 hours ago         1.916 GB
  51. centos              centos6             a3c09d36ab4a        2 days ago          194.6 MB
  52. registry            latest              c6c14b3960bd        3 days ago          33.28 MB
  54. # 后台运行docker容器，并指定nat端口转发
  55. [root@docker ~]# docker run -d -p 2222:22 -P --name=sshd centos:centos6-ssh
  56. b4211f7a304d9e34b72b510230be2c7a76b276886b488f08f3e12896a4d3c172

7. ssh登陆到docker容器内，部署项目环境

  1. # inspect 查看docker 容器IP地址
  2. [root@docker ~]# docker inspect sshd | grep IPAddress
  3. [root@docker ~]# ssh visionet@172.17.0.2
  4. visionet@172.17.0.2's password:
  5. [visionet@b4211f7a304d ~]$
  7. # Install mysql
  8. # Install tomcat server
  10. [visionet@b4211f7a304d ~]$ exit
  11. [root@docker ~]# docker stop sshd
  12. sshd
  13. [root@docker ~]# docker ps -l
  14. CONTAINER ID        IMAGE                COMMAND               CREATED             STATUS                       PORTS               NAMES
  15. b4211f7a304d        centos:centos6-ssh   "/usr/sbin/sshd -D"   6 minutes ago       Exited (255) 3 seconds ago                       sshd
  16. [root@docker ~]# docker commit b4211f7a304d centos:centos6-tomcat
  17. sha256:b4f114d5484822d9a3ddf1100b76b460985ba5e5d31e936570e8d7dbd8df282c
  18. [root@docker ~]# docker images
  19. REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
  20. centos              centos6-tomcat      b4f114d54848        4 seconds ago       363.1 MB
  21. centos              centos6-httpd       77eb12e36c7b        15 minutes ago      290.3 MB
  22. centos6-visionet    latest              aeed37612ecb        7 hours ago         1.916 GB
  23. centos              centos6-ssh         d6dccb483fa6        9 hours ago         363 MB
  24. centos              centos6             a3c09d36ab4a        2 days ago          194.6 MB
  25. registry            latest              c6c14b3960bd        3 days ago          33.28 MB

8. 推送centos:centos6-tomcat到私有docker仓库