fix: use UDP for upstream DNS by default #1032
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
How to categorize this PR?
/area networking
/kind enhancement
/platform azure
What this PR does / why we need it:
In the past there have been issues with using TCP for upstream DNS requests on Azure. The infrastructure does not handle lots of TCP connections for DNS queries well and the cluster may run into rate throttling leading to "connection timeout" issues during DNS resolution.
To avoid users having to manually set the
spec.SystemComponents.NodeLocalDNS.ForceTCPToUpstreamDNS
property for Azure, this PR sets a default value (false) if the property is not set on the shoot. This will make the shoot use UDP for upstream DNS by default and should prevent the issue from the start.Release note: