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Re: Changing files during migration [message #13673 is a reply to message #13672] Fri, 01 June 2007 13:32 Go to previous message
dev is currently offline  dev
Messages: 1693
Registered: September 2005
Location: Moscow
Senior Member
Jun OKAJIMA wrote:
>>>If I change/modifi/delete opened files during migration,
>>>what happens?
>>>
>>>For example....
>>>
>>>1. I run a mail daemon ( like qmail or sendmail) in a VE.
>>>2. Freeze the VE and create a suspend image.
>>> In this moment, the daemon opens /var/spool/mail/* files.
>>
>>how can daemon open the file if it is frozen (and the whole VE as well)?
>>
>>
>
>
> Wait, wait. sorry, not opens, but opened.
>
> [HostOS]# vzctl 101 start
> [HostOS]# vzctl 101 enter
> [VE101]# /etc/init.d/sendmail start
> .... sendmail opens /var/spool/mail/* in this moment.
> [VE101]# exit
> [HostOS]# vzctl 101 save
> [HostOS]# rm -rf /var/lib/vz/root/101/var/spool/mail
> [HostOS]# vzctl 101 restore
>
> ---> Then, what happens?

restore should fail. Changing VE filesystem from VE0
is a hack actually. It is convinient for management in
some situations, but you should understand what you do.
In this case you modify the filesystem of VE which is
frozen and doesn't expect files modifications.

So restore fails.

Thanks,
Kirill

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