DevOps / GitHub Actions Interview Questions

What is the difference between the env:, secrets:, and vars: contexts in GitHub Actions?

All three hold key-value configuration but differ in storage location, security characteristics, and intended use.

env vs secrets vs vars Contexts
Context	Where it is defined	Encrypted at rest?	Visible in logs?	Typical use
`env:`	Inline in the workflow YAML (workflow/job/step scope)	No — plain text in the repo	Yes	Non-sensitive config like feature flags, version numbers, region names embedded directly in YAML
`secrets:`	Repository / Organisation / Environment Settings → Secrets	Yes — encrypted by GitHub	No — masked as `***`	Passwords, API keys, tokens, certificates — anything that must not be readable in the YAML or logs
`vars:`	Repository / Organisation / Environment Settings → Variables	No — stored as plain text	Yes	Non-sensitive config that should be managed in the GitHub UI without editing YAML (e.g. target environment URL, Node version to use across many workflows)

The key distinction between env: and vars: is that vars: are managed in the GitHub UI and shared across workflows without touching YAML files, whereas env: values are hardcoded in the YAML itself. Use vars: when you want non-engineers to be able to change configuration without a pull request.

Access syntax: ${{ secrets.MY_KEY }}, ${{ vars.MY_VAR }}, ${{ env.MY_ENV }}.

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Which context should you use for storing a database password in GitHub Actions? env:

✗ Try again — not quite right.

vars:

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secrets:

✓ Well done — that is correct!

github:

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What is the main advantage of vars: over env: for non-sensitive configuration? vars: values are encrypted

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vars: are managed in the GitHub UI and shared across workflows without editing YAML

✓ Well done — that is correct!

vars: values are masked in logs

✗ Try again — not quite right.

vars: support complex objects, env: only supports strings

✗ Try again — not quite right.

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