hostdisconnected

Hostdisconnected is a term used in computing to denote a monitored host that has ceased communicating with its management or orchestration system. When a host becomes disconnected, the control plane typically cannot issue commands, gather metrics, or coordinate tasks, and the host may be treated as unavailable for the duration of the disconnect. Depending on the system, the host may still be running and reachable on the local network, but it is no longer part of the managed cluster or service.

The concept appears in various virtualization and cluster management environments, including hypervisor management platforms and distributed systems. In these contexts, hosts are usually kept alive and tracked through a heartbeat or watchdog mechanism; a disruption in this communication triggers a hostdisconnected state. The specific meaning and consequences of the state can vary between platforms, with some systems distinguishing between transient disconnections and permanent removals.

Common causes include network failures or partitions, power or hardware issues, problems with management agents or services, certificate or authentication failures, DNS or time-sync errors, and maintenance actions that temporarily suspend communication. The impact often involves degraded availability, potential workload drainage, and limited ability to perform automated recovery actions such as live migration or failover until the host reconnects.

Troubleshooting typically involves verifying network connectivity and firewall rules, checking the management server and host logs for errors, confirming agent status, ensuring accurate time synchronization, and validating cluster configuration. Recovery steps may include restarting management services, rejoining the host to the cluster, or addressing underlying hardware or network faults. See also host not responding and host offline for related states in different systems.