envoyproxy/envoy
Vedi su GitHubstrict_dns: allow to keep stale targets for a specified amount of time
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#15.457 aperta il 12 mar 2021
area/dnshelp wanted
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Descrizione
Problem:
When a DNS does not return all targets on each resolve, strict_dns will continually be adding and draining targets. For this case logical_dns is better, but it's still not great, it keeps track of a single logical target even though connections are made to several, for the given resolution interval all connections and traffic will flow to a single IP address, also I really don't know how outlier_detection and other advanced features can play with a logical_dns cluster.
original_dst cluster supports cleaning unused targets and be an option, but it's also probably unsafe since it allows connecting to any IP address.
Proposed Solutions:
- Adding support for
cleanup_intervalforstrict_dnsclusters likeoriginal_dstdoes, and remove them when they have not been returned for a given time. - Adding a "mixed dns" cluster which supports this sort of behavior.