BuildKitd config path accepts BUILDKITD_CONFIG

Introduced 2026-10-07 · score 0.96

HOW TO USE IT

When CI cannot inject command-line arguments, set `BUILDKITD_CONFIG` to the config file path and start `buildkitd`. An explicit `--config` flag takes precedence; if neither is set, the default path applies.

WHY THIS HELPS

Point BuildKitd at a custom configuration file in a restricted CI environment where injecting command-line arguments is not practical.

REQUIREMENTS AND LIMITATIONS

• Version: v0.34.0
• BUILDKITD_CONFIG: Environment variable containing only the configuration file path.
• --config <path>: Selects a different configuration file path; takes precedence over BUILDKITD_CONFIG.
• The environment variable contains only the config file path.
• An explicit `--config` flag takes precedence over the environment variable.
• The default path is unchanged when neither the flag nor variable is set.

FIRST-PARTY EVIDENCE

• https://github.com/moby/buildkit/releases/tag/v0.34.0
• https://github.com/moby/buildkit/pull/7144
• https://github.com/moby/buildkit/blob/v0.34.0/docs/buildkitd.toml.md

Check the installed version and the source before using it. Entry JSON

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