No one with 2 nodes and 11 namespaces needs 20GB. Up to a few hundred pods and ten nodes the openshift processes themselves shouldn't be using more than a few hundred megs. If you plan on growing or haven't upgraded to etcd3 you obviously want to leave some wiggle room, but even very large clusters don't need that much.
Do keep an eye on etcd memory usage - if it's above 20% of physical you need to grow your masters immediately. But you should be nowhere near that amount of memory at your size. On Oct 21, 2017, at 7:26 AM, Louis Santillan <lsant...@redhat.com> wrote: Firstly, leaving swap enabled is an anti-pattern in general [0] as OpenShift is then unable to recognize OOM conditions until performance is thoroughly degraded. Secondly, we generally recommend to our customers that they have at least 20GB [1] for Masters. I've seen many customers go far past that to suit their comfort. [0] https://docs.openshift.com/container-platform/3.6/admin_ guide/overcommit.html#disabling-swap-memory [1] https://docs.openshift.com/container-platform/3.6/ install_config/install/prerequisites.html#production- level-hardware-requirements ___________________________________________________ LOUIS P. SANTILLAN SENIOR CONSULTANT, OPENSHIFT, MIDDLEWARE & DEVOPS Red Hat Consulting, NA US WEST <https://www.redhat.com/> lpsan...@gmail.com M: 3236334854 <https://red.ht/sig> TRIED. TESTED. TRUSTED. <https://redhat.com/trusted> On Fri, Oct 20, 2017 at 4:54 PM, Joel Pearson <japear...@agiledigital.com.au > wrote: > Hi, > > I've got a brand new OpenShift cluster running on OpenStack and I'm > finding that the single master that I have is struggling big time, it seems > to consume tons of virtual memory and then start swapping and slows right > down. > > It is running with 16GB of memory, 40GB disk and 2 CPUs. > > The cluster is fairly idle, so I don't know why the master gets this way. > Restarting the master solves the problem for a while, for example, I > restarted it at 10pm last night, and when I checked again this morning it > was in the same situation. > > Would having multiple masters alleviate this problem? > > Here is a snapshot of top: > > [image: Inline images 1] > > Any advice? I've happy to build the cluster with multiple masters if it > will help. > > > -- > Kind Regards, > > Joel Pearson > Agile Digital | Senior Software Consultant > > Love Your Software™ | ABN 98 106 361 273 > > > _______________________________________________ > users mailing list > users@lists.openshift.redhat.com > http://lists.openshift.redhat.com/openshiftmm/listinfo/users > > _______________________________________________ users mailing list users@lists.openshift.redhat.com http://lists.openshift.redhat.com/openshiftmm/listinfo/users
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