Skip Navigation
Programming @beehaw.org small44 @beehaw.org

Unable to start lemmy docker

I would like to contribute to lemmy but I have issue with the docker image. I got this error when trying to execute docker-compose up : "ERROR: Service 'lemmy' failed to build: the --mount option requires BuildKit. Refer to https://docs.docker.com/go/buildkit/ to learn how to build images with BuildKit enabled"

I executed the commands that was in the link in the error message and I still have the same issue.

2
2 comments

  • If you enabled BuildKit globally in daemon.json config, you'll need to restart the docker daemon (systemctl restart docker). If you're enabling it for a one-off build, you'll need to run the build like this:

    DOCKER_BUILDKIT=1 docker build -t lemmy:latest .

    I had to update some build scripts for a few other projects, and that worked.

  • Building is different than doing a compose up. If you're making changes to the dockerfile and want to build your changes, then DOCKER_BUILDKIT=1 docker build -t custom/lemmy: . should be the correct method.

    Then you would change the docker-compose file to reference your newly built image instead of using the docker hub one. See this document.