Debugging

If you come across bugs, here are some simple debugging suggestions.

Rerun commands with --debug

The Dagger CLI tries to keep its output concise by default. If you're running into issues and want to debug with more detailed output, you can run any dagger subcommand with the --debug flag to have it reveal all available information.

Access the Dagger Engine logs

The Dagger Engine runs in a dedicated Docker container and emits log messages as it works. Here's how to access these logs:

DAGGER_ENGINE_DOCKER_CONTAINER="$(docker container list --all --filter 'name=^dagger-engine-*' --format '{{.Names}}')"
docker logs $DAGGER_ENGINE_DOCKER_CONTAINER