Image monitor

Core server monitor to update image used by the dev command to the one currently in use by a stack.

To configure the image monitor, provide values in /etc/image-monitor.env and issue the command sudo systemctl enable --now image-monitor. Logs are in /var/log/image-monitor.log.

# Set the cluster id whose CONTAINER_IMAGE_URI metadata setting is used to
# update the local variables.php.image_uri stacker variable that is propagated
# to PHP_IMAGE_URI in the /etc/php/php-fpm.env on each update.
CLUSTER_ID=""

# The token used must be allowed to GET /v2/clusters in the account whose image
# is being monitored.
WEBSCALE_API_TOKEN=""

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Last modified on July 5, 2026