docker--build自己的image
通过container commit成image
[root@localhost docker_test]# docker container commit #可以简写成docker commit
"docker container commit" requires at least and at most arguments.
See 'docker container commit --help'. Usage: docker container commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]] Create a new image from a container's changes
[root@localhost docker_test]# docker image build #可以简写成docker build
"docker image build" requires exactly argument.
See 'docker image build --help'. Usage: docker image build [OPTIONS] PATH | URL | - Build an image from a Dockerfile
以centos image为例，centos base image 默认没安装vim，进入交互式，yum install vim
[root@localhost docker_test]# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
bigni/test1 latest f5620b92331c hours ago 861kB
ubuntu 14.04 2c5e00d77a67 weeks ago 188MB
centos latest 9f38484d220f months ago 202MB
hello-world latest fce289e99eb9 months ago .84kB
[root@localhost docker_test]# docker run centos
[root@localhost docker_test]# docker run centos -it
docker: Error response from daemon: OCI runtime create failed: container_linux.go:: starting container process caused "exec: \"-it\": executable file not found in $PATH": unknown.
ERRO[] error waiting for container: context canceled
[root@localhost docker_test]# docker run -it centos
[root@dba873e57276 /]# ls
anaconda-post.log bin dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
[root@dba873e57276 /]# vim
bash: vim: command not found
[root@dba873e57276 /]# yum install -y vim
[root@localhost docker_test]# docker container ls -a #查看所有container
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
dba873e57276 centos "/bin/bash" minutes ago Exited () seconds ago infallible_rubin
36c7c2011bdb centos "-it" minutes ago Created wonderful_haslett
2401371f2c7a centos "/bin/bash" minutes ago Exited () minutes ago vibrant_dijkstra
[root@localhost docker_test]# docker commit
"docker commit" requires at least and at most arguments.
See 'docker commit --help'. Usage: docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]] #docker commit 使用方法 Create a new image from a container's changes
[root@localhost docker_test]# docker commit infallible_rubin bigni/centos_vim #把names：infallible_rubin 的container commit 成image：bigni/centos_vim
sha256:afe852c481e754b88b28a663f6e98e0a52816e253c64af4b2b823f8bb8702961
[root@localhost docker_test]# docker image ls -a #查看新增image，比centos image大了好多，安装vim 需要的依赖包不少。
REPOSITORY TAG IMAGE ID CREATED SIZE
bigni/centos_vim latest afe852c481e7 seconds ago 362MB
<none> <none> 3ec8199c2855 hours ago 861kB
bigni/test1 latest f5620b92331c hours ago 861kB
ubuntu 14.04 2c5e00d77a67 weeks ago 188MB
centos latest 9f38484d220f months ago 202MB
hello-world latest fce289e99eb9 months ago .84kB
[root@localhost docker_test]# docker run -it bigni/centos_vim #交互式运行
bigni/centos_vim bigni/centos_vim:latest
[root@localhost docker_test]# docker run -it bigni/centos_vim #交互式运行，测试能不能使用vim
[root@3afa6597d516 /]# vim test
[root@3afa6597d516 /]# cat test
docker so easy
[root@3afa6597d516 /]# exit #退出
exit
[root@localhost docker_test]# docker container ls -a #可以看到新增一个container
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3afa6597d516 bigni/centos_vim "/bin/bash" About a minute ago Exited () seconds ago cranky_zhukovsky
dba873e57276 centos "/bin/bash" minutes ago Exited () minutes ago infallible_rubin
36c7c2011bdb centos "-it" minutes ago Created wonderful_haslett
2401371f2c7a centos "/bin/bash" minutes ago Exited () minutes ago vibrant_dijkstra
[root@localhost docker_test]#
查看原始的centos image 和新增的image
[root@localhost docker_test]# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
bigni/centos_vim latest afe852c481e7 minutes ago 362MB
bigni/test1 latest f5620b92331c hours ago 861kB
ubuntu 14.04 2c5e00d77a67 weeks ago 188MB
centos latest 9f38484d220f months ago 202MB
hello-world latest fce289e99eb9 months ago .84kB
[root@localhost docker_test]# docker history 9f38484d220f
IMAGE CREATED CREATED BY SIZE COMMENT
9f38484d220f months ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B
<missing> months ago /bin/sh -c #(nop) LABEL org.label-schema.sc… 0B
<missing> months ago /bin/sh -c #(nop) ADD file:074f2c974463ab38c… 202MB
[root@localhost docker_test]# docker history afe852c481e7
IMAGE CREATED CREATED BY SIZE COMMENT
afe852c481e7 minutes ago /bin/bash 160MB #可以看到，比原始的image多了一层 layer
9f38484d220f months ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B
<missing> months ago /bin/sh -c #(nop) LABEL org.label-schema.sc… 0B
<missing> months ago /bin/sh -c #(nop) ADD file:074f2c974463ab38c… 202MB
[root@localhost docker_test]#
上面就是通过docker commit 在base image至少build自己的image，这种方式不值得提倡，因为当把这个image发布出去后，别人并不知该image安装了什么，
而且也有可能是不安全的image。
另一种方式是通过Dockerfile来build一个image。
[root@localhost ~]# mkdir docker_vim
[root@localhost ~]# vim docker_vim/Dockerfile
[root@localhost ~]# cat docker_vim/Dockerfile
FROM centos
RUN yum install -y vim
[root@localhost ~]# docker build -t bigni/centos_vim ./docker_vim/ #通过dockerfile build 新的image
Sending build context to Docker daemon .048kB
Step / : FROM centos #from centos
---> 9f38484d220f #直接引用centos image这一层，而不会新创建一层
Step / : RUN yum install -y vim #运行Dockerfile里配置的命令
---> Running in 551ad2fd3374 #创建临时container
Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package vim-enhanced.x86_64 :7.4.-.el7_6 will be installed
--> Processing Dependency: vim-common = :7.4.-.el7_6 for package: :vim-enhanced-7.4.-.el7_6.x86_64
中间省略---> Package perl-Pod-Usage.noarch :1.63-.el7 will be installed
--> Processing Dependency: perl(Pod::Text) >= 3.15 for package: perl-Pod-Usage-1.63-.el7.noarch
--> Finished Dependency Resolution Dependencies Resolved ================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
vim-enhanced x86_64 :7.4.-.el7_6 updates 1.0 M
Installing for dependencies:
中间省略which x86_64 2.20-.el7 base k Transaction Summary
================================================================================
Install Package (+ Dependent packages) Total download size: M
Installed size: M
Downloading packages:
warning: /var/cache/yum/x86_64//base/packages/gpm-libs-1.20.-.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for gpm-libs-1.20.-.el7.x86_64.rpm is not installed
Public key for perl-Pod-Escapes-1.04-.el7_6.noarch.rpm is not installed
--------------------------------------------------------------------------------
Total kB/s | MB :
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Importing GPG key 0xF4A80EB5:
Userid : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"
Fingerprint: ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
Package : centos-release--6.1810..el7.centos.x86_64 (@CentOS)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : gpm-libs-1.20.-.el7.x86_64 / 中间省略 Complete!
Removing intermediate container 551ad2fd3374
---> f853f2a3f901
Successfully built f853f2a3f901 #创建完成
查看创建的image
[root@localhost ~]# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
bigni/centos_vim latest f853f2a3f901 minutes ago 362MB
bigni/test1 latest f5620b92331c hours ago 861kB
ubuntu 14.04 2c5e00d77a67 weeks ago 188MB
centos latest 9f38484d220f months ago 202MB
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