[lxc-users] lxc-users Digest, Vol 56, Issue 7

[Tycho Andersen]

On Tue, Jan 20, 2015 at 11:35:50AM +0100, Thouraya TH wrote:
> 2015-01-09 13:00 GMT+01:00 <lxc-users-request at lists.linuxcontainers.org>:
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> > Today's Topics:
> >
> >    1. Re: Snapshot size (Tycho Andersen)
> >    2. Re: Snapshot size (Tycho Andersen)
> >
> >
> > ---------- Message transféré ----------
> > From: Tycho Andersen <tycho.andersen at canonical.com>
> > To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
> > Cc:
> > Date: Thu, 8 Jan 2015 07:19:52 -0700
> > Subject: Re: [lxc-users] Snapshot size
> > On Sun, Jan 04, 2015 at 07:42:38PM +0100, Thouraya TH wrote:
> > > Hello,
> > >
> > > On what depends the size of a checkpoint of a container? the size of
> > data that
> > > are in the container ?
> >
> > The size of the RAM, lxc-checkpoint is a frontend for CRIU, and CRIU
> > dumps only memory state (well, and "ghost" file state).
> >
> > > if i increase the size of data in a container, the snapshot's size
> > increase
> > > ?
> >
> >
> > *If there is more data in RAM, the CRIU images will be bigger.*
> 
> 
> Hello,
> @Tycho: I'm so sorry, i can't find the right option to send my reply
> correctly to the list.
> 
> *1)*
> I try to increase data size in the container like that:
> 
>            root at worker:/home# vim MyTestFile.txt
>            root at worker:/home# du -sh MyTestFile.txt
>            4.0K    MyTestFile.txt
>            root at worker:/home# truncate -s 16M MyTestFile.txt
>            root at worker:/home# du --apparent-size -h MyTestFile.txt
>           16M    MyTestFile.txt
> 
> Then Dumping Process: in ImGLXC1Worker directory
> 
>            root at g-3:/home/ImGLXC1Worker# du -sh
>            *7.9M   * .
>            root at g-3:/home/ImGLXC1Worker# du -h
>           7.9M    .
> 
> 
> *2)*  i have increased the size from *16M to 160M*
> 
>           root at worker:/home# truncate -s *160M* MyTestFile.txt
>           root at worker:/home# du --apparent-size -h MyTestFile.txt
>           160M    MyTestFile.txt
> 
>      Then Dumping Process: in a new ImGLXC1Worker2 directory
>           root at griffon-38:/home/ImGLXC1Worker2# du -sh
>           *7.7M *
> 
> Have you an explanation please ?

Yes, the CRIU images contain only what's in memory, not what's on
disk, so having a large file on disk inside the container won't help.
Further, it looks like you're just putting the file in your /home; is
that the container's root filesystem mount point? I'm guessing it's
not.

Tycho

> Thanks a lot for help.
> Best regards.
> 
> 
> >
> > Tycho
> >
> > > Thanks a lot for answer.
> > > Best Regards.
> >
> > > _______________________________________________
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> > > http://lists.linuxcontainers.org/listinfo/lxc-users
> >
> >
> >
> >
> > ---------- Message transféré ----------
> > From: Tycho Andersen <tycho.andersen at canonical.com>
> > To: LXC users mailing-list <lxc-users at lists.linuxcontainers.org>
> > Cc:
> > Date: Thu, 8 Jan 2015 07:20:05 -0700
> > Subject: Re: [lxc-users] Snapshot size
> > On Mon, Jan 05, 2015 at 11:25:13AM +0530, Ashish Bunkar wrote:
> > > Hi
> > > What is your OS, because in my environment lxc-chekpoint is depreciated
> > > command now ?
> >
> > It is?
> >
> > Tycho
> >
> > > Thanks & Regards
> > > Ashish Bunkar
> > > Contact No.- +91-7259183696
> > >
> > > On 01/05/2015 12:12 AM, Thouraya TH wrote:
> > > >Hello,
> > > >
> > > >On what depends the size of a checkpoint of a container? the size of
> > data
> > > >that are in the container ?
> > > >if i increase the size of data in a container, the snapshot's size
> > > >increase ?
> > > >
> > > >Thanks a lot for answer.
> > > >Best Regards.
> > > >
> > > >
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> >
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