vzdump question

[proxymoxy]

Even though I read a lot about it, I am still not sure. May be you know more

I know that it is possible to create snapshots of a running container. But I am wondering whether this operation is "safe". For example no matter what complex database and memory "stuff" is running in the container, would the restore option resume these (always) flawlessly?

 

[tom]

this was discussed several times already. pls use the search function of the forum and read all relevant threads.

 

[proxymoxy]

I did search before asking, but didn't find an explicite answer.

The closest one is "http://forum.proxmox.com/threads/2769-Question-about-snapshots?highlight=vzdump". But this was two years ago and the answer was

no, currently not. (but it should be easy to extend vzdump that way)

I also read other topics and used my favorite search engine, but still not sure.

A link would be nice (but I would prefer a simple yes or no answer).

 

[dietmar]

A link would be nice (but I would prefer a simple yes or no answer).

The operation is safe if you use database with transaction support. A vzdump snapshot behave like a power loss on physical hardware. Modern database/filesystem can handle that without problems (Yes, worst case you need to run fsck or database recovery, but that should always succeed).

 

[proxymoxy]

Dietmar, thanks. Now I understand 100%

"vzdump snapshot behave like a power loss on physical hardware".

It also answers my question, what happens when a user edits some text with a simple text editor and the system is dumped.