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Dagger Operator Manual

Custom buildkit setup

Dagger can be configured to use an existing buildkit daemon, running either locally or remotely. This can be done using two environment variables: BUILDKIT_HOST and DOCKER_HOST.

To use a buildkit daemon listening on TCP port 1234 on localhost:

export BUILDKIT_HOST=tcp://localhost:1234

To use a buildkit daemon running in a container named "super-buildkit" on the local docker host:

export BUILDKIT_HOST=docker-container://super-buildkit

To use a buildkit daemon running on a remote docker host (be careful to properly secure remotely accessible docker hosts!)

export BUILDKIT_HOST=docker-container://super-buildkit
export DOCKER_HOST=tcp://my-remote-docker-host:2376

OpenTracing Support

Both Dagger and buildkit support opentracing. To capture traces to Jaeger, set the JAEGER_TRACE environment variable to the collection address.

A docker-compose file is available to help bootstrap the tracing environment:

docker-compose -f ./dagger-main/tracing.compose.yaml up -d
export JAEGER_TRACE=localhost:6831
export BUILDKIT_HOST=docker-container://dagger-buildkitd-jaeger

dagger up

You can then go to http://localhost:16686/ in your browser to see the traces.