Sukadev Bhattiprolu wrote:
> Daniel Lezcano [dlezcano@xxxxxxxxxx] wrote:
>> Sukadev Bhattiprolu wrote:
>>> Link lxc_checkpoint, lxc_restart with USERCR[2]
>>>
>>> 3. Checkpoint/restart a simple LXC container
>>>
>>> $ lxc-execute --name foo --rcfile lxc-no-netns.conf -- /bin/sleep 1000
>>>
>>> $ lxc-freeze --name foo
>>>
>>> $ lxc-checkpoint --name foo --image /root/lxc-foo.ckpt
>>>
>>> $ lxc-unfreeze --name foo
>> IMO, the freeze / thaw should be done in the lxc_checkpoint function code.
>
> Well, by separating the freeze and checkpoint, we could do things like
> snapshot the filesystem or would lxc_checkpoint make an external call
> to do that ?
>
> I will leave it as is for my next version and I am guessing it can be done
> easily later ?
>>> $ lxc-stop --name foo
>>>
>>> $ lxc-restart --name foo --image /root/lxc-foo.ckpt
>> Is the container restarted in a frozen state ?
>
> It can be (by setting the restart_args->freezer). I will leave it in
> frozen for now. Maybe later we can add a command line option to let
> user choose whether or not to leave it frozen
The lxc_checkpoint / lxc_restart API have already the --pause option
defined.
If you don't specify the --pause option, the checkpoint and the restart
release the application right after finishing their job.
There is also the --kill option for the checkpoint, to kill the
container after the checkpoint.
The lxc_checkpoint function should do:
freeze();
checkpoint();
if (kill) {
stop();
unfreeze();
return;
}
if (!pause)
unfreeze();
return;
The same for the restart except for the 'kill'.
The functions are already defined in lxc, it takes 5 mins to write this
code.
Defined in lxc.h :
extern int lxc_stop(const char *name);
extern int lxc_freeze(const char *name);
extern int lxc_unfreeze(const char *name);
The lxc_checkpoint / lxc_restart functions have a 'flags' parameter with
LXC_FLAG_PAUSE or LXC_FLAG_HALT (if set in the command line).
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