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Docker Compose Secret vs Environment Variable: When to Use Each - How to Fix DNS_PROBE_FINISHED_NXDOMAIN Error in Edge-How to Resolve Cloudflare 521 After Server Update

Updated 2026-07-28 17:40:52developer-tools
Docker Compose Secret vs Environment Variable: When to Use Each - How to Fix DNS_PROBE_FINISHED_NXDOMAIN Error in Edge-How to Resolve Cloudflare 521 After Server Update
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Decision checklist

  • Match the tool to the workflow that fails most often, not only the feature list.
  • Keep export format, permissions, and automation limits in the final decision.

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