disable synthesized hostname in systemd-resolved #3451
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Otherwise, the reverse lookup in `netdog` will return "linux" if no other name can be resolved by DNS. This causes problems when trying to join several nodes to a Kubernetes cluster, since they all attempt to register as "linux". The expected (historical) behavior is that the system hostname winds up as the primary interface's IP address in this case. This is not ideal and causes other headaches: for example, the short name of the host is the first part of the IP in dotted decimal notation. But in the absence of a setting or reverse DNS, it's at least a potentially predictable and unique identifier. Signed-off-by: Ben Cressey <[email protected]>
etungsten
approved these changes
Sep 13, 2023
zmrow
approved these changes
Sep 13, 2023
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Issue number:
N/A - reported by @etungsten
Description of changes:
Disable the synthesized hostname feature in
systemd-resolved.Otherwise, the reverse lookup in
netdogwill return "linux" if no other name can be resolved by DNS. This causes problems when trying to join several nodes to a Kubernetes cluster, since they all attempt to register as "linux".The expected (historical) behavior is that the system hostname winds up as the primary interface's IP address in this case. This is not ideal and causes other headaches: for example, the short name of the host is the first part of the IP in dotted decimal notation. But in the absence of a setting or reverse DNS, it's at least a potentially predictable and unique identifier.
Testing done:
Before:
After:
Terms of contribution:
By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.