Increase core-dns limits
I got this on my test cluster:
Aug 12 13:05:26 varac-test.openappstack.net kernel: oom_reaper: reaped process 1861 (coredns), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Aug 12 13:28:00 varac-test.openappstack.net kernel: oom_reaper: reaped process 24236 (coredns), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Aug 12 13:30:26 varac-test.openappstack.net kernel: oom_reaper: reaped process 13201 (coredns), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Aug 12 13:32:31 varac-test.openappstack.net kernel: oom_reaper: reaped process 20783 (coredns), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Aug 12 13:36:36 varac-test.openappstack.net kernel: oom_reaper: reaped process 28393 (coredns), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB