[fix] Add robustness to peer address resolution

[paulomach]

Fix #137

• Leverage name resolution order (/etc/hosts/ -> dns) to solve self and peer fqdn.
• For peer resolution, skip dns, by using self fqdn and replacing pod name part.
• DNS is kept as fallback.

[sinclert-canonical]

Approving it ASAP to leave the PR unblock.

Please, address the comments whenever possible.

[astrojuanlu]

No extra comments from my side

[paulomach]

Waiting for the K8s issues to be clarified before merging.

[sinclert-canonical]

Judging by this issue in the K8s-snap repo, are these changes still necessary?

[paulomach]

Judging by this issue in the K8s-snap repo, are these changes still necessary?

Not strictly, but I would like to keep it as it enables less reliance on DNS. Thoughts?

[sinclert-canonical]

Not strictly, but I would like to keep it as it enables less reliance on DNS. Thoughts?

I think the FQDN resolution using /etc/hosts can stay, if you think this is applicable to all K8s environments. However, the automatic retries should be pruned until we are made aware that the current logic is time-sensitive.