I've never had this problem myself but a thing worth trying is reusing the connection. In ~oneadmin/.ssh/config we can add these lines:
--8<------ Host * ControlMaster auto ControlPath ~/.ssh/sockets/%r@%h-%p ControlPersist 600 ------>8-- And create the directory ~oneadmin/.ssh/sockets. The first time it connects to a host a new file will be created and will be reused for the next connections to the same host. I hope it fixes or alleviates the problem. On Fri, Mar 14, 2014 at 6:55 PM, Steven Timm <t...@fnal.gov> wrote: > > We recently deployed several new and bigger hosts on our OpenNebula 3.2 > cloud and are seeing some issues. At this point we are not sure if we are > dealing with an OS problem with the sshd or something else. > But the symptom is that we see a OpenNebula monitoring process come into the > VM host as oneadmin, do its thing but then the sshd process > (owned by root) that spawned the process starts using up to 100% of system > cpu, and it is not killable at all. strace of the sshd process simply hang. > Eventually a lot of these build up on the VM host and it is almost > impossible to do anything. Only way to kill them we have found so far > is to restart the parent sshd and then we can kill all the child sshd > processes. > > The symptom tends to happen when there are more than 20 virtual machines on > the same host. These are new Ivy-Bridge based hosts that should be good for > at least 40 VM's apiece. > > Has anyone seen anything like this before? And yes, I know the 4.x series > of opennebula is a lot more efficient in its monitoring and we are trying to > get there as fast as we can. > > Steve Timm > ------------------------------------------------------------------ > Steven C. Timm, Ph.D (630) 840-8525 > t...@fnal.gov http://home.fnal.gov/~timm/ > Fermilab Scientific Computing Division, Scientific Computing Services Quad. > Grid and Cloud Services Dept., Associate Dept. Head for Cloud Computing > _______________________________________________ > Users mailing list > Users@lists.opennebula.org > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org -- Javier Fontán Muiños Developer OpenNebula - The Open Source Toolkit for Data Center Virtualization www.OpenNebula.org | @OpenNebula | github.com/jfontan _______________________________________________ Users mailing list Users@lists.opennebula.org http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
