Harden a Compose service with security_opt (no-new-privileges, seccomp, apparmor)

domain: docker · 6 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

  1. Add a `security_opt:` LIST to the service with one option string per entry.
  2. Enable no-new-privileges with `security_opt: - no-new-privileges:true` (true may be omitted since the bare option is treated as enabled): `- no-new-privileges`.
  3. Restrict seccomp or apparmor with entries like `- seccomp=profile.json` or `- apparmor=docker-default`.
  4. Set SELinux labeling with `- label=user:USER` / `- label=role:ROLE`.
  5. Run `docker compose up -d` and verify with `docker inspect --format '{{.HostConfig.SecurityOpt}}' <container>`.
  6. Official docs: https://docs.docker.com/reference/compose-file/services/#security_opt and https://docs.docker.com/reference/cli/docker/container/run/#security-opt

Known gotchas

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