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Docker Compose Secret vs Environment Variable: When to Use Each - How to Fix Docker Pull Access Denied Error-Nginx 502 Upstream Connection Refused Guide

Updated 2026-07-28 05:37:48cloud-software
Docker Compose Secret vs Environment Variable: When to Use Each - How to Fix Docker Pull Access Denied Error-Nginx 502 Upstream Connection Refused Guide
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.

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