从机器上备份数据卷容器 [英] Backing up data volume containers off machine

问题描述

阅读此文件时：

https://docs.docker.com/userguide/dockervolumes/#backup-restore-or-migrate-data-volumes

我认为他们引用的tar文件在容器中仍然是孤立的，而这些示例在机器丢失后仍然没有显示出来保存状态？

Am I correct in the thinking that tar file they're referencing is still isolated in containers, and these examples aren't demonstrating anyway to preserve state after a machine loss?

或者是因为我的无知而没有进行精神飞跃？

Or is there a mental leap I'm not making with due to my ignorance?

推荐答案

docker run --volumes-from dbdata -v $(pwd):/backup \
  ubuntu tar cvf /backup/backup.tar /dbdata

这里：

Here:

• 我们已经启动了一个新的容器，并从 dbdata 容器中装入卷。


• 我们已经将本地主机目录安装为 / backup 。


• 最后，我们传递了一个使用tar将 dbdata 卷的内容备份到 backup.tar 我们的 / backup 目录中的文件。
  
  当命令完成并且容器停止时，我们将留下我们的 dbdata 卷的备份。

• we’ve launched a new container and mounted the volume from the dbdata container.
• We’ve then mounted a local host directory as /backup.
• Finally, we’ve passed a command that uses tar to backup the contents of the dbdata volume to a backup.tar file inside our /backup directory.
  When the command completes and the container stops we’ll be left with a backup of our dbdata volume.

所以：

我正在考虑到他们引用的tar文件在容器中仍然是隔离的。 b $ b

Am I correct in the thinking that tar file they're referencing is still isolated in containers

不，它是在pwd（在主机硬盘驱动器当前工作目录下），因为pwd被挂载为 / backup 在发生tar的ubuntu容器中。

No, it is on pwd (on the host hard drive current working directory), since pwd was mounted as /backup in the ubuntu container where the tar occurred.

当前工作目录的一个ls将列出 backup.tar ，一旦容器ubuntu退出。

An ls of the current working directory will list backup.tar, once the container ubuntu exits.

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