如何将数据卷从一个主机传输到另一个主机？ [英] How to port data-only volumes from one host to another?

问题描述

如关于使用卷的Docker文档中所述，有所谓的

$ b $

基本上这听起来很棒。但是有一件事我不明白。

这些卷（其中不显示地映射到主机上的一个文件夹，以便移植性原因，如文档所述）由Docker在主机上的某个内部文件夹（ / var / docker / volumes / ... ）中创建和管理。

假设我使用了这样一个卷，然后我需要将它从一个主机迁移到另一个主机 - 如何端口的卷？ AFAICS它有一个唯一的ID - 我可以去卷并将其根据数据的容器复制到新的主机？如何找出要复制的文件？还有Docker内置了一些我还没有发现的支持？

解决方案

正式的答案现在可以在这里找到：

使用卷共享目录

在备份，还原或迁移数据卷部分中，您具有：

备份：

  sudo docker run --rm --volumes-from DATA  - v $（pwd）：/ backup busybox tar cvf /backup/backup.tar / data 
  

• - rm ：删除容器退出


• - 卷 - DATA ：附加到DATA容器共享的卷


• -v $（pwd）：/ backup ：将当前目录绑定到容器中;将tar文件写入


• busybox ：一个简单的图像 - 适合快速维护


• tar cvf /backup/backup.tar / data ：创建/ data目录中所有文件的未压缩tar文件






RESTORE：

 ＃创建一个新的数据容器
 $ sudo docker create -v / data --name DATA2 busybox true 
＃将备份文件导入新容器数据卷
 $ sudo docker run --rm  - 卷 - 来自DATA2 -v $（pwd）：/ backup busybox tar xvf /backup/backup.tar 
 data / 
 data / sven.txt 
＃与原始容器比较
 $ sudo docker run --rm --volumes  -  from DATA -v`pwd`：/ backup busybox ls / data 
 sven.txt 
  




As described in the Docker documentation on Working with Volumes there is the concept of so-called data-only containers, which provide a volume that can be mounted into multiple other containers, no matter whether the data-only container is actually running or not.

Basically, this sounds awesome. But there is one thing I do not understand.

These volumes (which do not explicitly map to a folder on the host for portability reasons, as the documentation states) are created and managed by Docker in some internal folder on the host (/var/docker/volumes/…).

Supposed I use such a volume, and then I need to migrate it from one host to another - how do I port the volume? AFAICS it has a unique ID - can I just go and copy the volume and its according data-only container to a new host? How do I find out which files to copy? Or is there some support built-in to Docker that I did not discover yet?

解决方案

The official answer is now available here:

Sharing Directories using Volumes

In the "Backup, restore, or migrate data volumes" section you have:

BACKUP:

sudo docker run --rm --volumes-from DATA -v $(pwd):/backup busybox tar cvf /backup/backup.tar /data

• --rm: remove the container when it exits
• --volumes-from DATA: attach to the volumes shared by the DATA container
• -v $(pwd):/backup: bind mount the current directory into the container; to write the tar file to
• busybox: a small simpler image - good for quick maintenance
• tar cvf /backup/backup.tar /data: creates an uncompressed tar file of all the files in the /data directory

RESTORE:

# create a new data container
$ sudo docker create -v /data --name DATA2 busybox true
# untar the backup files into the new container᾿s data volume
$ sudo docker run --rm --volumes-from DATA2 -v $(pwd):/backup busybox tar xvf /backup/backup.tar
data/
data/sven.txt
# compare to the original container
$ sudo docker run --rm --volumes-from DATA -v `pwd`:/backup busybox ls /data
sven.txt

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