构建自己的docker镜像

1. 基于一个已经存在container创建docker image

docker container commit -> 简写：docker commit

[root@localhost ~]# docker container commit
"docker container commit" requires at least 1 and at most 2 argument(s).
See 'docker container commit --help'.

Usage:  docker container commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

Create a new image from a container's changes

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1.1 首先查看一下所有的container：

[root@localhost etc]# docker container ls -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                           PORTS               NAMES
712d8fc38a12        centos              "/bin/bash"         13 minutes ago      Exited (127) 4 seconds ago                           serene_blackwell
5761e167445a        centos              "/bin/bash"         About an hour ago   Exited (0) About an hour ago                         jovial_brattain
04479c838b35        centos              "/bin/bash"         About an hour ago   Exited (127) About an hour ago                       sad_heisenberg
76d7c3bb5ae0        hello-world         "/hello"            10 hours ago        Exited (0) 10 hours ago                              keen_morse

1.2 执行：docker commit keen_morse helloworld/centos-vim ：

[root@localhost ~]# docker commit keen_morse helloworld/centos-vim
sha256:62cf4fc411f93c02f2c4fb59a44824e6d9f71873285d34bb75e14d720ebda807

查看一下：

[root@localhost etc]# docker image ls
REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
helloworld/centos-vim   latest              fae5c0510522        About an hour ago   1.85 kB
docker.io/centos        latest              5182e96772bf        3 days ago          200 MB
docker.io/hello-world   latest              2cb0d9787c4d        4 weeks ago         1.85 kB

这种方式不是很好，其他人不知道这个image是如何创建出来的，具有不安全因素。

2. 用Dockerfile构建镜像

docker image build -> 简写：docker build

[root@localhost ~]# docker image build
"docker image build" requires exactly 1 argument(s).
See 'docker image build --help'.

Usage:  docker image build [OPTIONS] PATH | URL | -

Build an image from a Dockerfile

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我们以构建vim为例进行简单入门：

2.1 首先创建一个目录

mkdir /root/docker-centos-vim

2.2 创建Dockerfile

• 将目录切换到docker-centos-vim下：cd /root/docker-centos-vim
• 创建文件：vim Dockfile
• 在Dockfile中输入如下内容：

FROM centos
RUN yum install -y vim

• 执行构建命令：
  docker build -t jerry/centos-vim-new . ；
  . 表示根据当前目录下的Dockerfile进行构建