canonical/cos-lib

Feat: Improve Nginx performance

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#145 opened on May 6, 2025

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good first issue

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Description

From a review in another Nginx PR, there were some minor improvement comments:

  1. Use Syntax: resolver address ... [valid=time] to shorten the valid attribute on the resolver to something like 5s as by default it'll use the default DNS TTL which might be large. In the backend for reverse proxy, you usually want to be reactive to change.
  2. Shorten the default DNS timeout (30s, huge when requests are pending to be proxied) with a resolver_timeout to something like 5s.

This was attempted to be apart of the Nginx miration to cos-lib, but created PR smell. This should still be investigated.

Contributor guide

Research direction
Investigate the recommended resolver and resolver timeout settings for Nginx in a reverse proxy context within the COS stack. Update the Nginx configuration template to set resolver valid time to 5s and resolver timeout to 5s. Ensure these changes are consistent with the existing configuration and test the proxy behavior.
Tech stack
python
Domain
backenddevops
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
NginxDNS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70