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Detect when your Docker images have new versions available — using SHA256 digest comparison, not just tags. Notify, update or rollback with one click.
docker run -d -p 9091:3002 afraguas1983/nexus-watcher
Why NEXUS Watcher
Watchtower checks tags — but if your image is tagged latest and the content changes, it won't know. NEXUS Watcher compares SHA256 digests directly against the registry. No false negatives. No surprises.
Features
Compares SHA256 local digest vs registry. Catches updates even when the tag stays the same — perfect for latest.
Notify only — detect and show in dashboard, you decide. Or auto-update — pull and recreate containers automatically.
Saves the previous digest before updating. If something breaks, one click restores the previous version.
1h, 3h, 6h, 12h or 24h — choose from the Settings tab. Applied live without restarting the container.
Instant notification when an update is found or applied. Configure bot token and chat ID from the UI.
English and Spanish UI out of the box. Preference saved locally — switch with one click.
JWT login with configurable admin credentials. All API endpoints are protected.
Full log of every scan with results, updates found and errors. Know exactly what happened and when.
Integrates with NEXUS dashboard and NEXUS Notify. Set NEXUS_URL and the ecosystem activates automatically.
How it works
On startup and on schedule, Watcher lists all images via the Docker API.
Queries Docker Hub or GHCR for the current Docker-Content-Digest of each image.
Compares local vs registry SHA256. If different — update available. No false positives.
Sends a Telegram alert and shows the update in the dashboard. In auto mode, pulls and recreates the container.
NEXUS Watcher works great standalone. But when combined with NEXUS, NEXUS Notify and NEXUS OS, it becomes part of a complete homelab management suite. Each tool works. Together, they think.
One command. All your Docker images, monitored.
docker run -d -p 9091:3002 -v /var/run/docker.sock:/var/run/docker.sock afraguas1983/nexus-watcher