2、Commit

实战：利用commit命令来构建镜像(`不推荐`)-2022.2.28

1、用法

docker commit 容器id 镜像name:tag

2、举例

step1：运行一个centos容器
[root@xyy admin]###docker run -it -d centos
608078af64734e4a199b75ce337959e22c2944464a4a9f723fcc3ad2e8d42d85
[root@xyy admin]###docker ps
CONTAINER ID   IMAGE     COMMAND       CREATED         STATUS         PORTS     NAMES
608078af6473   centos    "/bin/bash"   3 seconds ago   Up 2 seconds             boring_meninsky

step2：进到这个centos容器里面，构建好我们需要的环境
[root@xyy admin]###docker exec -it 608078af6473 bash
[root@608078af6473 /]### yum install nginx
Failed to set locale, defaulting to C.UTF-8
CentOS Linux 8 - AppStream                                                                            2.3 MB/s | 8.1 MB     00:03    
CentOS Linux 8 - BaseOS                                                                               5.8 MB/s | 3.5 MB     00:00    
^CCentOS Linux 8 - Extras                                                                               1.9 kB/s | 6.6 kB     00:03    
Error: Failed to download metadata for repo 'extras': Librepo was interrupted by a signal
[root@608078af6473 /]### exit
exit

step3：使用commit命令将容器转换成我们需要的镜像
###先来查看下当前本地镜像信息
[root@xyy admin]###docker images
REPOSITORY   TAG       IMAGE ID       CREATED        SIZE
centos       latest    5d0da3dc9764   2 months ago   231MB

###开始构建镜像
[root@xyy admin]###docker commit 608078af6473 test-commit-command:v1
sha256:8fa14905fbf663736f24188e2d2a1a1ca08621c2672b7e64ac7c58adf46b66ac

step4：构建完成后我们验证下
[root@xyy admin]###docker images
REPOSITORY            TAG       IMAGE ID       CREATED         SIZE
test-commit-command   v1    8fa14905fbf6   9 seconds ago   257MB
centos                latest    5d0da3dc9764   2 months ago    231MB
[root@xyy admin]###docker commit