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Knowledge Base

Syslog logger dropping log messages. rMinPeak growing above eMinPeak for logging group (79032)

Last Updated: 9/4/2020Categories: Known IssueTotal Views: 18518Language:
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Symptoms

ESXi Host is reporting an alarm

Alarm 'Host error' on <Host Name> triggered by event 30258576 'Issue detected on <Host Name> in <Cluster Name>: vmsyslog logger <ip>:514 lost 2210935 log messages

In /var/log/vmkernel.log similar entries are seen

2020-04-09T17:25:34.490Z cpu24:65990)MemSched: 14635: Admission failure in path: logging/vmsyslogd.4810784/uw.4810784
2020-04-09T17:28:14.367Z cpu29:65990)MemSched: 14635: Admission failure in path: logging/vmsyslogd.4810998/uw.4810998
2020-04-09T17:41:33.482Z cpu0:65990)MemSched: 14635: Admission failure in path: logging/vmsyslogd.4811898/uw.4811898

2020-04-08T13:33:12.334Z cpu0:65990)ALERT: vmsyslog logger <IP address>:514 lost 2210935 log messages

In /var/log/.vmsyslogd.err similar entries are seen

Traceback (most recent call last):
File "/build/mts/release/bora-15256549/bora/build/esx/release/vmvisor/sys-boot/lib64/python3.5/site-packages/vmsyslog/loggers/file.py", line 379, in writeLog
File "/build/mts/release/bora-15256549/bora/build/esx/release/vmvisor/sys-boot/lib64/python3.5/subprocess.py", line 676, in __init__
File "/build/mts/release/bora-15256549/bora/build/esx/release/vmvisor/sys-boot/lib64/python3.5/subprocess.py", line 1228, in _execute_child
OSError: [Errno 28] No space left on device

Note: The preceding log excerpts are only examples.Date,time and environmental variables may vary depending on your environment.

Purpose

To stop the out of memory condition for logging group.

Cause

vmsyslog is spawning subprocess frequently to execute this on-rotate command. This is causing memory exhaustion, resulting in  memory limit reaching the max configured for ‘logging’ group.

Resolution

This issue is resolved in

VMware vSphere ESXi 6.7 Patch release ESXi670-202004002

VMware vSphere ESXi 6.5 Patch release ESXi650-202007001

These patches are available to download at Customer Connect Patch Downloads

Workaround

To workaround this issue

1. Verify the memory limits:
# localcli --plugin-dir=/usr/lib/vmware/esxcli/int sched group getmemconfig -g host/vim/vmvisor/logging

Example
rMinPeak Is greater than eMinPeak for logging:

gid name parGid eMinPeak rMinPeak

752 logging 14 87040 94952

14 vmvisor 2 2999688 2999688

2.Increase the memory allocation for the pool logging to maximum  120mb using following command.

localcli --plugin-dir=/usr/lib/vmware/esxcli/int sched group setmemconfig -g host/vim/vmvisor/logging -i 82 -m 120 -u mb

Note: The workaround is not persistent across reboot since /usr/lib/vmware/rp/bin/configRP script is called after reboot which will restore default configs as default values are hardcoded which cannot be modified.

Detectable by VMware SkylineTM

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Attachments

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