如何保持两个文件夹自动同步? [英] How to keep two folders automatically synchronized?

问题描述

我想要一个文件夹及其所有子树的同步副本.

I would like to have a synchronized copy of one folder with all its subtree.

它应该以这种方式自动工作:每当我在原始文件夹中创建，修改或删除内容时，这些更改都将自动应用于同步文件夹.

It should work automatically in this way: whenever I create, modify, or delete stuff from the original folder those changes should be automatically applied to the sync-folder.

哪个是执行此任务的最佳方法?

Which is the best approach to this task?

顺便说一句:我在Ubuntu 12.04上

BTW: I'm on Ubuntu 12.04

最终目标是拥有单独的实时备份副本，而无需使用符号链接或安装. 我使用Ubuntu One在我的计算机之间同步数据，过了一会儿出现了问题，并且在同步期间所有数据都丢失了.

Final goal is to have a separated real-time backup copy, without the use of symlinks or mount. I used Ubuntu One to synchronize data between my computers, and after a while something went wrong and all my data was lost during a synchronization.

所以我想进一步增加一个步骤来保存我的数据的备份副本:

So I thought to add a step further to keep a backup copy of my data:

• 我将数据存储在文件夹A"上
• 我需要当前问题的答案才能创建文件夹A"到文件夹B"的单向同步(cron使用rsync的脚本可能是吗?).我需要它只能是从A到B的单向方式，任何对B的更改都不得应用于A.
• 我只是保持与Ubuntu One同步的文件夹B"
  
  以这种方式，A中的任何更改都将被添加到B中，这将从U1中检测到并同步到云中.如果出现任何问题，并且U1删除了B上的数据，我总是将它们放在A上.

• I keep my data stored on a "folder A"
• I need the answer of my current question to create a one-way sync of "folder A" to "folder B" (cron a script with rsync? could be?). I need it to be one-way only from A to B any changes to B must not be applied to A.
• The I simply keep synchronized "folder B" with Ubuntu One
  
  In this manner any change in A will be appled to B, which will be detected from U1 and synchronized to the cloud. If anything goes wrong and U1 delete my data on B, I always have them on A.

受lanzz的评论启发，另一个想法可能是在启动时运行rsync来备份Ubuntu One下的文件夹内容，并仅在rsync完成后才启动Ubuntu One.

Inspired by lanzz's comments, another idea could be to run rsync at startup to backup the content of a folder under Ubuntu One, and start Ubuntu One only after rsync is completed.

您对此有何看法? 如何知道rsync何时结束?

What do you think about that? How to know when rsync ends?

推荐答案

您可以使用inotifywait(已启用modify,create,delete,move标志)和rsync.

You can use inotifywait (with the modify,create,delete,move flags enabled) and rsync.

while inotifywait -r -e modify,create,delete,move /directory; do
    rsync -avz /directory /target
done

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