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4398305661
The KVM agent's storage heartbeat scripts (kvmheartbeat.sh and
kvmspheartbeat.sh) hard-code an immediate kernel-level reboot via
'echo b > /proc/sysrq-trigger' when a heartbeat write to primary storage
times out. This bypasses all OS-level shutdown protections, drops every
running VM on the host instantly, and triggers HA cascades onto
surviving hosts.
For NFS shared storage the binary "heartbeat-write-failed = host-is-dead"
heuristic is reasonable. For LINSTOR/DRBD or other replicated local
storage, the same disk serves application I/O, replication I/O and
heartbeat I/O simultaneously - so a transient I/O contention spike can
time out the heartbeat write without the host actually being unhealthy.
The result is false-positive sysrq fencing.
Adds a new agent.properties option:
kvm.heartbeat.fence.action = reboot | graceful-reboot
| restart-agent | log-only
Default value is "reboot" so existing deployments keep their current
behavior. Operators on replicated storage backends can choose a less
destructive action:
- graceful-reboot: 'systemctl reboot' instead of sysrq, allowing VMs
a chance to shut down cleanly
- restart-agent: restart cloudstack-agent only, preserving running VMs
- log-only: log + alert, no automatic action
The existing 'reboot.host.and.alert.management.on.heartbeat.timeout'
boolean continues to function as a complete Java-side bypass.
Refs: https://github.com/apache/cloudstack/issues/13089
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