mirror of https://github.com/linkerd/linkerd2.git
517616a166
Kubernetes will do multiple DNS lookups for a name like `proxy-api.conduit.svc.cluster.local` based on the default search settings in /etc/resolv.conf for each container: 1. proxy-api.conduit.svc.cluster.local.conduit.svc.cluster.local. IN A 2. proxy-api.conduit.svc.cluster.local.svc.cluster.local. IN A 3. proxy-api.conduit.svc.cluster.local.cluster.local. IN A 4. proxy-api.conduit.svc.cluster.local. IN A We do not need or want this search to be done, so avoid it by making each name absolute by appending a period so that the first three DNS queries are skipped for each name. The case for `localhost` is even worse because we expect that `localhost` will always resolve to 127.0.0.1 and/or ::1, but this is not guaranteed if the default search is done: 1. localhost.conduit.svc.cluster.local. IN A 2. localhost.svc.cluster.local. IN A 3. localhost.cluster.local. IN A 4. localhost. IN A Avoid these unnecessary DNS queries by making each name absolute, so that the first three DNS queries are skipped for each name. Signed-off-by: Brian Smith <brian@briansmith.org> |
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| viz.go | ||