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"The school can't afford any downtime!"

The DNS server went down for maintenance. Result: the entire network lost name resolution for 20 minutes. Teachers couldn't access Nextcloud. The clinic couldn't reach their calendar.

When your services become essential, you can't afford single points of failure. High Availability (HA) means running critical services on multiple machines simultaneously, so if one goes down, the other takes over automatically.

With a Proxmox cluster and HA configured:

  • If a node crashes, its VMs restart automatically on another node
  • DNS can run on two servers — if one dies, the other answers
  • The network keeps working even during planned maintenance

Work in Progress

This section will explain high availability concepts and when they become necessary for a community network.

Guide reference

For HA setup instructions, see Guide — High Availability.