This is a minimal fork of a hostname block, extended to watch for updates to a file in a shared volume, to allow other containers to set the hostname

An utility block to set the hostname of devices running balenaOS.

Disclaimer: Setting the hostname on a device running balenaOS is as easy as hitting an API endpoint on the supervisor. This utility wraps the required http request into a prebuilt image that you can drop on your projects. It's clearly NOT the most efficient approach as the device needs to download and run an additional container. See our documentation for specifics on how to roll this into your own services.

We maintain images for this block on balenaHub Container Registry. The images can be accessed using:

bh.cr/g_tomas_migone1/hostname-<arch> or bhcr.io/g_tomas_migone1/hostname-<arch> where <arch> is one of: rpi, armv7hf, aarch64 or amd64.

For details on how to select a specific version or commit version of the image see our documentation.

To use this image, create a container in your docker-compose.yml file and set the SET_HOSTNAME environment variable as shown below:

version: "2"

services:
  hostname:
    image: bh.cr/g_tomas_migone1/hostname
    restart: no # Required to avoid container restarting indefinitely
    labels:
      io.balena.features.supervisor-api: 1 # Required to interact with the supervisor
    environment:
      SET_HOSTNAME: balena-test-hostname