Docker: Run Telegraf as non-root

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The Telegraf 1.20.3 release changed the official Telegraf DockerHub image to no longer run the Telegraf service as root. With this change, the Telegraf service runs with the least amount of privileges in the container to enhance security given the wide extensibility and array of plugins available in Telegraf.

Both Docker’s published best practices and the Center for Internet Security (CIS) Docker Benchmark encourage running containers as a non-root user to limit a container’s exploitability and impact on the host system. This change was made to align with those recommendations and further enhance the security and experience of running Telegraf in a container.

We understand that making this change in a maintenance release is both unexpected and has the potential to cause undesirable side effects. After some initial feedback on the initial change, we made an additional update to our implementation to lessen the impact on users and are more widely advertising this change. The Telegraf 1.20.3, 1.19.3, and 1.18.3 DockerHub images were all updated a second time.

The result of this change may require users to modify how they use the Telegraf Docker image. Users need to ensure the telegraf user or telegraf group, which runs the Telegraf service, has access to any additional required services, sockets, files, etc., required for operation. Users can grant access using standard commands like usermod to add the telegraf user to a group or chown to change the ownership of a file.

Users are still able to install extra packages or configure services using the DockerHub image.

If a user passes in the Docker socket for Telegraf to monitor Docker itself, then they will need to add the `telegraf` user to the group that owns the Docker socket. One way to achieve this is to use the --user option when launching from the docker CLI:

docker run --user telegraf:$(stat -c '%g' /var/run/docker.sock) ...

The Docker Run documentation has further information on specifying a user and group.

At InfluxData we’ve built the company based on a set of core values. The introduction of this change actually reminds us of four of the five of these values:

  • We are committed to open source
  • We believe humility drives learning
  • We embrace failure
  • We get stuff done

Our desire to align with the best practices and support the community was at the forefront of this change. We have had a strong focus on continuing to advance our security posture in 2021 and we will continue to do so in the future.  However, our open source community also let us know that making this change in a maintenance release was less than ideal, despite the good intentions.  We appreciated the direct and specific feedback provided by the community.  So, we worked quickly to incorporate the feedback.  We will use this experience to learn and improve our release processes going forward.

We appreciate our amazing community and continue to be humbled by their encouragement and suggestions, particularly when we don’t get it quite right.

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