07 揭秘Docker容器镜像：封装与加载的艺术 一、 容器打包 - 镜像 二、 镜像打包备份 三、 从备份镜像包进行镜像加载 四、 通过加载的备份镜像发布容器

07 揭秘Docker容器镜像：封装与加载的艺术

一、 容器打包 - 镜像

容器提供代码运行环境 + 代码部署完毕 -> ⼀起打包

$ docker commit -m "描述信息" -a "作者信息" 容器ID/容器名称 ⾃定义镜像名称：⾃定义标签

[superman@docker ~]$ docker commit -m "httpd_index" -a "superman" superman01 httpd_superman:1.0

示例：

[superman@docker ~]
$ docker 
ps 
-a


CONTAINER ID   IMAGE       COMMAND              CREATED        STATUS                       PORTS                                     NAMES


[superman@docker ~]
$ 


[superman@docker ~]
$ docker run 
-d 
-p 
10001:80 
--name superman01 httpd:2.4 


a49745e02e0326ca496408ca58358779de408356f087189b69d827fe0acf966f


[superman@docker ~]
$ 


[superman@docker ~]
$ docker 
ps 
-a


CONTAINER ID   IMAGE       COMMAND              CREATED          STATUS          PORTS                                     NAMES


a49745e02e03   httpd:2.4   
"httpd-foreground"   
14 seconds ago   Up 
13 seconds   
0.0.0.0:10001->80/tcp, :::10001->80/tcp   superman01


[superman@docker ~]
$ 


[superman@docker ~]
$ docker 
cp ./index.html a49745e02e03:/usr/local/apache2/htdocs


                                             Successfully copied 
2.05kB to a49745e02e03:/usr/local/apache2/htdocs


[superman@docker ~]
$


[superman@docker ~]
$ curl 
192.168.0.121:10001






<html 
lang
=en>


<head>


    <meta 
charset
=UTF-8>


    <title>Welcome to Apache</title>


</head>


<body>


</body>


</html>


[superman@docker ~]
$ 


[superman@docker ~]
$ docker images


REPOSITORY   TAG       IMAGE ID       CREATED       SIZE


tomcat       latest    fb5657adc892   
2 years ago   680MB


httpd        
2.4       dabbfbe0c57b   
2 years ago   144MB


httpd        latest    dabbfbe0c57b   
2 years ago   144MB


[superman@docker ~]
$ 


[superman@docker ~]
$ docker commit 
-m 
"httpd_index" 
-a 
"superman" superman01 httpd_superman:1.0


sha256:f0d394fd69d57ec39fc080860e39d5da4c4f9b6702f477d7b033b6e1ed997b10


[superman@docker ~]
$ 


[superman@docker ~]
$ docker images


REPOSITORY       TAG       IMAGE ID       CREATED         SIZE


httpd_superman   
1.0       f0d394fd69d5   
7 seconds ago   144MB


tomcat           latest    fb5657adc892   
2 years ago     680MB


httpd            
2.4       dabbfbe0c57b   
2 years ago     144MB


httpd            latest    dabbfbe0c57b   
2 years ago     144MB


[superman@docker ~]
$ 

二、 镜像打包备份

$ docker save 镜像名称:标签 -o 镜像打包的⽂件名 (eg: xxx.tar)

docker save文件默认保存在当前目录 - 目录可以手工指定

[superman@docker ~]$ docker save httpd_superman:1.0 -o httpd_superman.tar

示例：

[superman@docker ~]
$ ls


index.html  superman_share


[superman@docker ~]
$ 


[superman@docker ~]
$ docker save httpd_superman:1.0 
-o httpd_superman.tar


[superman@docker ~]
$ 


[superman@docker ~]
$ ls


httpd_superman.tar  index.html  superman_share


[superman@docker ~]
$

三、 从备份镜像包进行镜像加载

[superman@docker ~]$ docker load -i ./httpd_superman.tar

示例：

[superman@docker ~]
$ docker 
stop superman01


superman01


[superman@docker ~]
$ 


[superman@docker ~]
$ docker 
rm superman01  


superman01


[superman@docker ~]
$ 


[superman@docker ~]
$ docker images


REPOSITORY       TAG       IMAGE ID       CREATED         SIZE


httpd_superman   
1.0       f0d394fd69d5   
2 minutes ago   144MB


tomcat           latest    fb5657adc892   
2 years ago     680MB


httpd            
2.4       dabbfbe0c57b   
2 years ago     144MB


httpd            latest    dabbfbe0c57b   
2 years ago     144MB


[superman@docker ~]
$ 


[superman@docker ~]
$ docker rmi httpd_superman:1.0


Untagged: httpd_superman:1.0


Deleted: sha256:f0d394fd69d57ec39fc080860e39d5da4c4f9b6702f477d7b033b6e1ed997b10


Deleted: sha256:25d542b6f6b60330530bbeefe7fee54394afb8baa2f925a3783b6785da4e7931


[superman@docker ~]
$ 


[superman@docker ~]
$ docker images


REPOSITORY   TAG       IMAGE ID       CREATED       SIZE


tomcat       latest    fb5657adc892   
2 years ago   680MB


httpd        
2.4       dabbfbe0c57b   
2 years ago   144MB


httpd        latest    dabbfbe0c57b   
2 years ago   144MB


[superman@docker ~]
$  


[superman@docker ~]
$ docker load 
-i ./httpd_superman.tar


c48257d11771: Loading layer [
==================================================>]  
5.632kB/5.632kB


Loaded image: httpd_superman:1.0


[superman@docker ~]
$ 


[superman@docker ~]
$ docker images


REPOSITORY       TAG       IMAGE ID       CREATED         SIZE


httpd_superman   
1.0       f0d394fd69d5   
3 minutes ago   144MB


tomcat           latest    fb5657adc892   
2 years ago     680MB


httpd            
2.4       dabbfbe0c57b   
2 years ago     144MB


httpd            latest    dabbfbe0c57b   
2 years ago     144MB


[superman@docker ~]
$

四、 通过加载的备份镜像发布容器

[superman@docker ~]$ docker run -d -p 11001:8080 --name superman11 httpd_superman:1.0

示例：

[superman@docker ~]
$ docker 
ps 
-a


CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES


[superman@docker ~]
$ 


[superman@docker ~]
$ docker run 
-d 
-p 
11001:80 
--name superman11 httpd_superman:1.0


53d2448b9728b17c4061992ef7e02d9f29513d197702f0404ef046d5d7da06b3


[superman@docker ~]
$ 


[superman@docker ~]
$ docker 
ps 
-a


CONTAINER ID   IMAGE                COMMAND              CREATED         STATUS         PORTS                                     NAMES


53d2448b9728   httpd_superman:1.0   
"httpd-foreground"   
4 seconds ago   Up 
3 seconds   
0.0.0.0:11001->80/tcp, :::11001->80/tcp   superman11


[superman@docker ~]
$


[superman@docker ~]
$ curl 
192.168.0.121:11001






<html 
lang
=en>


<head>


    <meta 
charset
=UTF-8>


    <title>Welcome to Apache</title>


</head>


<body>


</body>


</html>


[superman@docker ~]
$

原文链接： https://mp.weixin.qq.com/s?__biz=MzkxNzI1OTE3Mw==&mid=2247492133&idx=1&sn=921a4d223c616a3589942e2dcb74ee34&chksm=c141f4eff6367df96da4bc5bc37f97e9ce6ebf41e05f4c0db5cba5167ef5048a96f97e0958f1&token=2097529203&lang=zh_CN#rd

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