[PR #5794] [client] Add TTL-based cache refresh for management DNS resolver #26795

New Issue

saavagebueno · 2026-08-05T07:07:49-04:00

saavagebueno commented

2026-08-05 07:07:49 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/5794

State: closed
Merged: No

Describe your changes

Add TTL expiration mechanism to MgmtCacheResolver to handle DDNS IP changes. When cache entries expire (300s TTL), refresh synchronously using net.DefaultResolver. On refresh failure, serve stale cache to maintain connectivity.

Fixes #5113

Issue ticket number and link

https://github.com/netbirdio/netbird/issues/5113

Stack

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)

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Summary by CodeRabbit

Bug Fixes
- Improved DNS resolver caching with per-entry timestamps, TTL-based expiration, and automatic refresh of stale records. Failed refreshes now trigger a backoff while continuing to serve stale records for reliability. New logic also records insertion times and applies consistent TTLs to cached responses.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/5794 **State:** closed **Merged:** No --- ## Describe your changes Add TTL expiration mechanism to MgmtCacheResolver to handle DDNS IP changes. When cache entries expire (300s TTL), refresh synchronously using net.DefaultResolver. On refresh failure, serve stale cache to maintain connectivity. Fixes #5113 ## Issue ticket number and link https://github.com/netbirdio/netbird/issues/5113 ## Stack  ### Checklist - [X] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [X] Documentation is **not needed** for this change (explain why) ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__  ## Summary by CodeRabbit * **Bug Fixes** * Improved DNS resolver caching with per-entry timestamps, TTL-based expiration, and automatic refresh of stale records. Failed refreshes now trigger a backoff while continuing to serve stale records for reliability. New logic also records insertion times and applies consistent TTLs to cached responses.

saavagebueno added the pull-request label 2026-08-05 07:07:49 -04:00

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Reference: DYNR/netbird#26795