Pharos scraper proxy gets OOM killed

[jnummelin]

What happened:
Pharos scraper proxy (nginx) get OOM killed in some cases.

Nov 15 06:46:39 ip-172-31-23-209 kernel: [65267.037323] oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=aba6a64a8753ea5169d3f501d661492696ffeb640da38c613b81198435144dcd,mems_allowed=0-1,oom_memcg=/kubepods/burstable/poddfc7f441-06db-11ea-842a-0227fba247b6,task_memcg=/kubepods/burstable/poddfc7f441-06db-11ea-842a-0227fba247b6/aba6a64a8753ea5169d3f501d661492696ffeb640da38c613b81198435144dcd,task=nginx,pid=22232,uid=0
Nov 15 06:46:39 ip-172-31-23-209 kernel: [65267.037327] Memory cgroup out of memory: Kill process 22232 (nginx) score 1182 or sacrifice child
Nov 15 06:46:39 ip-172-31-23-209 kernel: [65267.042541] Killed process 22964 (nginx) total-vm:14136kB, anon-rss:844kB, file-rss:4kB, shmem-rss:0kB
Nov 15 06:46:39 ip-172-31-23-209 kernel: [65267.047980] oom_reaper: reaped process 22964 (nginx), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Nov 15 06:46:39 ip-172-31-23-209 kernel: [65267.137860] nginx invoked oom-killer: gfp_mask=0x7080c0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), order=0, oom_score_adj=999
Nov 15 06:46:39 ip-172-31-23-209 kernel: [65267.137862] CPU: 9 PID: 22232 Comm: nginx Not tainted 5.0.0-1021-aws #24~18.04.1-Ubuntu

What you expected to happen:

Not to see OOM kills. :)

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Pharos version (use pharos --version):
• Cloud provider or hardware configuration: AWS
• OS (e.g. from /etc/os-release; both for the client and for the used nodes): Ubuntu 18.04 with 5.x kernel
• Others: