查看“Docker备份容器”的源代码

为了备份容器，首先需要创建目标容器的快照<syntaxhighlight lang="shell-session">
[root@iZ8vbcjkeqbrdmmbt23vboZ apache2]# docker commit -p aade5ae73079 mediawiki:backup
sha256:4c5b2bca4f4414a4799185dc93ec8b45f22edaf14f37226633ebcf5fcfcd468a
</syntaxhighlight>该命令会生成一个作为Docker镜像的容器快照，可以通过运行 <code>docker images</code> 命令来查看Docker镜像，如下:<syntaxhighlight lang="shell-session">
[root@iZ8vbcjkeqbrdmmbt23vboZ apache2]# docker commit -p aade5ae73079 mediawiki:backup
sha256:4c5b2bca4f4414a4799185dc93ec8b45f22edaf14f37226633ebcf5fcfcd468a
[root@iZ8vbcjkeqbrdmmbt23vboZ apache2]# docker images
REPOSITORY           TAG       IMAGE ID       CREATED              SIZE
mediawiki            backup    4c5b2bca4f44   About a minute ago   1.28GB
droidwiki/restbase   latest    e65d562a0caf   5 months ago         267MB
mediawiki            1.35.4    168ad9077b3c   8 months ago         789MB
mysql                5.6       10de32843f91   8 months ago         303MB
nlpub/mathoid        latest    308bf216c0b3   2 years ago          1.16GB
[root@iZ8vbcjkeqbrdmmbt23vboZ apache2]# 
</syntaxhighlight>现在，为了备份该快照，我们有两个选择，一个是我们可以登录进Docker注册中心，并推送该镜像；另一个是我们可以将Docker镜像打包成tar包备份，以供今后使用。

如果我们不想备份到docker注册中心，而是想要将此镜像保存在本地机器中，以供日后使用，那么我们可以将其作为tar包备份。要完成该操作，我们需要运行以下 <code>docker save</code> 命令。<syntaxhighlight lang="shell-session">
[root@iZ8vbcjkeqbrdmmbt23vboZ ~]# docker save -o ~/mediawiki_backup.tar mediawiki:backup
</syntaxhighlight>如果我们将这些Docker镜像作为tar包文件备份到了本地，那么我们只要使用 docker load 命令，后面加上tar包的备份路径，就可以加载该Docker镜像了。<syntaxhighlight lang="shell-session">
[root@iZ8vbcjkeqbrdmmbt23vboZ ~]# docker load -i ~/container-backup.tar
</syntaxhighlight>

=== 备份 image 到私有 Registry ===
<syntaxhighlight lang="shell-session">
[root@iZ8vbcjkeqbrdmmbt23vboZ ~]# docker images
REPOSITORY                                                   TAG        IMAGE ID       CREATED          SIZE
mediawiki                                                    20230206   40b7a89a5482   29 seconds ago   1.66GB
mysql                                                        20230110   c9e6530d28b4   3 weeks ago      303MB
[root@iZ8vbcjkeqbrdmmbt23vboZ ~]# docker tag 40b7a89a5482 registry.cn-hangzhou.aliyuncs.com/www_jihongchang_top/wiki:mediawiki_20230206
[root@iZ8vbcjkeqbrdmmbt23vboZ ~]# docker push registry.cn-hangzhou.aliyuncs.com/www_jihongchang_top/wiki:mediawiki_20230206
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/www_jihongchang_top/wiki]
04c6a85fc579: Pushing [=========================>                         ]  436.8MB/872.7MB
f5fd5e55e174: Layer already exists 
f889b881cdaa: Layer already exists 
ef7d630f9747: Layer already exists 
1792b352b678: Layer already exists 
243425e22597: Layer already exists 
20de88a1924a: Layer already exists 
32f881145c7d: Layer already exists 
ee090b01bc23: Layer already exists 
6bd0e6fcab85: Layer already exists 
d51785f7f213: Layer already exists 
5a671bfd0b9a: Layer already exists 
7319d475e305: Layer already exists 
781f2b3fb29c: Layer already exists 
17398fc120fa: Layer already exists 
cfa11f06a213: Layer already exists 
8f477d20e632: Layer already exists 
658dc28b7c93: Layer already exists 
89a3f58688e1: Layer already exists 
3af749400b4a: Layer already exists 
e1bbcf243d0e: Layer already exists 
[root@iZ8vbcjkeqbrdmmbt23vboZ ~]#
</syntaxhighlight>