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To upgrade Uptime Kuma 1.23 to version 2 with Docker, stop the container, archive the data directory and switch the image to louislam/uptime-kuma:2.5.9, because latest still points to 1.23.17. The first start aggregates the history into new tables and deletes the raw heartbeats: do not interrupt it, and keep the backup to roll back.
Gatus is an uptime monitor you configure with YAML files instead of a web interface. With Docker Compose, the v5.37.0 image and a volume for SQLite, it checks HTTP, TCP, certificates and DNS TXT records, and alerts through a webhook. In my test it alerted on an nginx outage after 30 seconds, the time three 10-second checks take.
Uptime Kuma installs with Docker Compose and the louislam/uptime-kuma:2.5.9 image (not latest, which still points to 1.x), with a persistent volume at /app/data and port 3001. Bring the container up with docker compose up -d, pick SQLite on the first screen, then create the admin account.
