Can you please open a bug? https://bugzilla.redhat.com/enter_bug.cgi?product=ovirt-guest-agent
Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: yd...@redhat.com IRC : ydary On Fri, Mar 18, 2016 at 6:20 PM, Martin Sivak <msi...@redhat.com> wrote: > > Whats extremely prone to errors is the way the guest agent checks the > active user in GuestAgentLinux2.py line 325: > > > > users = os.popen('/usr/bin/users').read().split() > > That is something we could probably improve. The maintainer is Vinzenz > Feenstra. > > Martin > > > On Fri, Mar 18, 2016 at 3:13 PM, Andreas Trawöger > <andreas.trawoe...@qitasc.com> wrote: > > Hi Martin, > > > > Whats extremely prone to errors is the way the guest agent checks the > active user in GuestAgentLinux2.py line 325: > > > > users = os.popen('/usr/bin/users').read().split() > > > > This creates a new subprocess every time it is executed and if that > doesn't work for whatever reason the ovirt guest agent crashes instantly. > > > > But I probably should make that suggestions on the devel list. > > > > Regards > > > > ________________________________________ > > Von: Martin Sivak <msi...@redhat.com> > > Gesendet: Freitag, 18. März 2016 14:44 > > An: Andreas Trawöger > > Cc: oVirt Userlist > > Betreff: Re: [ovirt-users] MOM crashes ovirt-guest-agent > > > > Hi, > > > > it is not really a bug. You should give the VM more memory if you > > expect that it will need it that fast. The ballooning mechanism has > > its disadvantages and this is one of those. We do not react fast > > enough when such a fast allocation happens. > > > > There is really not much we can do from the mom / guest agent side. We > > could slowly increase the available memory when the guest agent dies > > (pretty easy to implement) and we might inform the system that a guest > > agent is an important process (if that is even possible) so OOM killer > > will avoid it. But that would not help with Cannot allocate memory > > error as even the OOM killer takes time before it reacts. > > > > Using low guaranteed memory values with ballooning for critical VMs is > > probably not the best idea. > > > > Regards > > > > -- > > Martin Sivak > > msi...@redhat.com > > SLA / oVirt > > > > On Fri, Mar 18, 2016 at 1:00 PM, Andreas Trawöger > > <andreas.trawoe...@qitasc.com> wrote: > >> Hi, > >> > >> > >> I'm trying to track down why my Foreman Centos7 VM continuously crashes > with > >> out of Memory errors on my ovirt-3.6 hosts and what seems to happen is > the > >> following: > >> > >> > >> 1. The Foreman VM only uses 1GB at the beginning and MOM over time > reduces > >> the memory size from 8GB Ram to the defined minimum of 2GB > >> > >> > >> mom.log: > >> 2016-03-18 12:25:42,669 - mom.Controllers.Balloon - INFO - Ballooning > >> guest:qvie-foreman from 2210584 to 2100054 > >> > >> > >> 2. When the VM needs RAM very quickly like if you do an 'cp /dev/zero > >> /run/zero' the ovirt guest agent crashes with an out of memory error. > >> > >> > >> ovirt-guest-agent.log: > >> > >> Traceback (most recent call last): > >> File "/usr/share/ovirt-guest-agent/OVirtAgentLogic.py", line 239, in > >> doWork > >> self.sendUserInfo() > >> File "/usr/share/ovirt-guest-agent/OVirtAgentLogic.py", line 355, in > >> sendUserInfo > >> cur_user = self.dr.getActiveUser() > >> File "/usr/share/ovirt-guest-agent/GuestAgentLinux2.py", line 325, in > >> getActiveUser > >> users = os.popen('/usr/bin/users').read().split() > >> OSError: [Errno 12] Cannot allocate memory > >> > >> 3. Resulting in an MOM warning that it can't get any memory stats from > the > >> VM. Leaving the memory size at its minimum size:. > >> > >> > >> mom.log: > >> > >> mom.Collectors.GuestMemory - WARNING - getVmMemoryStats() error: The > >> ovirt-guest-agent is not active > >> > >> > >> Any chances to prevent that from happening? Or is this a bug in MOM / > >> ovirt-guest-agent that should be fixed? > >> > >> > >> Greetings > >> > >> Andreas > >> > >> > >> _______________________________________________ > >> Users mailing list > >> Users@ovirt.org > >> http://lists.ovirt.org/mailman/listinfo/users > >> > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >
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