Estimated reading time: 4 minutes

Blogging, meet social. Known is a social publishing platform.

GitHub repo:

Library reference

This content is imported from the official Docker Library docs, and is provided by the original uploader. You can view the Docker Store page for this repo at

Supported tags and respective Dockerfile links

For detailed information about the published artifacts of each of the above supported tags (image metadata, transfer size, etc), please see the repos/known directory in the docker-library/repo-info GitHub repo.

For more information about this image and its history, please see the relevant manifest file (library/known). This image is updated via pull requests to the docker-library/official-images GitHub repo.

Known: social publishing for groups and individuals

Blogging, meet social.

Known is a social publishing platform. Publish on your own site, reach your audience across social media.


How to use this image

docker run --link some-mysql:db -d known

Now you can get access to fpm running on port 9000 inside the container. If you want to access it from the Internets, we recommend using a reverse proxy in front. You can find more information on that on the docker-compose section.

The following environment variables are also honored for configuring your Known instance:

  • -e KNOWN_DB_HOST=... (defaults to the IP and port of the linked mysql container)
  • -e KNOWN_DB_USER=... (defaults to “root”)
  • -e KNOWN_DB_PASSWORD=... (defaults to the value of the MYSQL_ROOT_PASSWORD environment variable from the linked mysql container)
  • -e KNOWN_DB_NAME=... (defaults to “known”)
  • -e MAIL_HOST=...
  • -e MAIL_PORT=...
  • -e MAIL_SECURE=... (“starttls” for instance)
  • -e MAIL_USER=...
  • -e MAIL_PASS=...

If the KNOWN_DB_NAME specified does not already exist on the given MySQL server, it will be created automatically upon startup of the known container, provided that the KNOWN_DB_USER specified has the necessary permissions to create it.

If you’d like to use an external database instead of a linked mysql container, specify the hostname and port with KNOWN_DB_HOST along with the password in KNOWN_DB_PASSWORD and the username in KNOWN_DB_USER (if it is something other than root):

$ docker run --name some-known -e KNOWN_DB_HOST= \
    -e KNOWN_DB_USER=... -e KNOWN_DB_PASSWORD=... -d known

Via docker-compose

You can use a setup that is used in production at IndieHosters/known.


Once started, you’ll arrive at the configuration wizard. Follow the steps as indicated.


Pull requests are very welcome!

We’d love to hear your feedback and suggestions in the issue tracker:


View license information for the software contained in this image.

Supported Docker versions

This image is officially supported on Docker version 17.04.0-ce.

Support for older versions (down to 1.6) is provided on a best-effort basis.

Please see the Docker installation documentation for details on how to upgrade your Docker daemon.

User Feedback


If you have any problems with or questions about this image, please contact us through a GitHub issue. If the issue is related to a CVE, please check for a cve-tracker issue on the official-images repository first.

You can also reach many of the official image maintainers via the #docker-library IRC channel on Freenode.


You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.

Before you start to code, we recommend discussing your plans through a GitHub issue, especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give you feedback on your design, and help you find out if someone else is working on the same thing.


Documentation for this image is stored in the known/ directory of the docker-library/docs GitHub repo. Be sure to familiarize yourself with the repository’s file before attempting a pull request.

library, sample, Known