https://github.com/traum-ferienwohnungen/conntrack-stats-exporter

https://github.com/traum-ferienwohnungen/conntrack-stats-exporter

conntrack kubernetes

Last synced: 3 days ago
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• Host: GitHub
• URL: https://github.com/traum-ferienwohnungen/conntrack-stats-exporter
• Owner: traum-ferienwohnungen
• License: gpl-3.0
• Created: 2018-10-22T07:18:43.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2019-07-01T11:06:05.000Z (over 5 years ago)
• Last Synced: 2024-06-20T16:50:38.388Z (5 months ago)
• Topics: conntrack, kubernetes
• Language: Go
• Size: 26.4 KB
• Stars: 1
• Watchers: 12
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Conntrack Statistics Exporter

The well known prometheus node exporter exports conntrack metrics off the /proc

pseudo file system. The conntrack module developers consider that surface as

deprecated and provide a CLI tool `conntrack` that shows some interesting

metrics. 

Motivation for this exporter was to survey `insert_failed` statistics due to a

race condition in the Linux ipfilter conntrack kernel code. This is a subtle

bug that in some circumstances escalates in high workload scenarios in

Kubernetes clusters and causes drop of initial packets of NATted connections

(both UDP, TCP.) The `insert_failed` statistic correlates with dropped

connections due to this bug.

## Further information about the conntrack race bug and its effect on Kubernetes

*  https://blog.quentin-machu.fr/2018/06/24/5-15s-dns-lookups-on-kubernetes/

*  https://tech.xing.com/a-reason-for-unexplained-connection-timeouts-on-kubernetes-docker-abd041cf7e02

*  https://www.weave.works/blog/racy-conntrack-and-dns-lookup-timeouts