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Knowledge Base

High CPU utilization is observed on worker and primary nodes in Enterprise PKS (70608)

Last Updated: 7/16/2020Categories: TroubleshootingTotal Views: 4034Language:
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Symptoms

You see high CPU utilization on worker and primary nodes when running bosh vms -–vital.

vRealize Log Insight is configured in PKS tile without any rate limit under the logging section.

You see output similar to the following when running a command similar to bosh -d <service-instance_xxxx> ssh <worker/xxxx>
<worker/xxxx>#top

Tasks: 152 total, 1 running, 118 sleeping, 0 stopped, 0 zombie
%Cpu(s): 91.4 us, 8.3 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0 st
KiB Mem: 2041816 total, 251604 free, 1444388 used, 345824 buff/cache
KiB Swap: 2040828 total, 1324040 free, 716788 used. 348904 avail Mem

PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
10529 root      10 -10 1692720 826192   5600 S 90.4 40.5  24927:17 ruby
9899 root      10 -10  829624  63144  12636 S  3.7  3.1   1608:37 kubelet
9322 root      10 -10  378708  30128   1376 S  1.3  1.5 645:01.23 dockerd

You see output similar to the following when running a command similar to <worker/xxxx>#ps ax | grep ruby

10543 ?        S<l  17553:36 ruby /var/vcap/packages/fluentd/bin/fluentd -c /var/vcap/jobs/fluentd/config/fluent.conf -p /var/vcap/packages/fluentd/plugins/ --no-supervisor
28356 pts/0    S+     0:00 grep --color=auto ruby

Cause

This issue is observed when Worker VM Type or Primary VM Type selected as small(cpu: 1, ram: 2 GB, disk: 8 GB) in plan in PKS Tile and vRealize Log Insight is configured in PKS tile without any rate limit under the logging section.

Resolution

 This is a known issue affecting Enterprise PKS.

Workaround

One of the following options can be employed to workaround this issue:​

Apply a rate limit to the vRLI settings in PKS tile under the logging section. See the instructions at Installing PKS on vSphere with NSX-T for more information. Apply the changes and validate that the CPU utilization is lowered.

Increase the CPU count of the worker/primary node in the plan by changing the VM Type in the PKS Tile.

Detectable by VMware SkylineTM

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Attachments

Additional Resources

KB
•
End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

KB
•
マスター ノードで ncp プロセスが失敗すると、Enterprise PKS クラスタが障害状態になる (70618)

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