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Lowers the default nodelocaldns denial cache TTL #74093

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merged 2 commits into from
Feb 22, 2019
Merged

Lowers the default nodelocaldns denial cache TTL #74093

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e51c902
Lowers the default nodelocaldns denial cache TTL
Feb 13, 2019
46c299c
Match default cache size of 10000
Feb 21, 2019
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4 changes: 4 additions & 0 deletions cluster/addons/dns/nodelocaldns/README.md
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Expand Up @@ -35,3 +35,7 @@ spec:
- Ingress
- Egress
```

### Negative caching

The `denial` cache TTL has been reduced to the minimum of 5 seconds [here](https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/nodelocaldns/nodelocaldns.yaml#L37). In the unlikely event that this impacts performance, setting this TTL to a higher value make help alleviate issues, but be aware that operations that rely on DNS polling for orchestration may fail (for example operators with StatefulSets).
5 changes: 4 additions & 1 deletion cluster/addons/dns/nodelocaldns/nodelocaldns.yaml
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Expand Up @@ -34,7 +34,10 @@ data:
Corefile: |
__PILLAR__DNS__DOMAIN__:53 {
errors
cache 30
cache {
success 9984 30
denial 9984 5
}
reload
loop
bind __PILLAR__LOCAL__DNS__
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