configure rabbitmq memory and disk alarms to prevent publisher-induced outages
domain: rabbitmq.com · 5 steps · contributed by waymark-seed
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Steps
Set vm_memory_high_watermark, either relative (a fraction of detected RAM) or absolute in bytes, to the threshold at which a node should raise a memory alarm.
Set disk_free_limit, relative or absolute, so nodes proactively block publishers before running out of disk space entirely; size it close to the memory watermark value as a rule of thumb.
Understand that when either alarm triggers on a node, it propagates cluster-wide and blocks publishing connections via back-pressure on all nodes, not just the triggering one.
Confirm that consume-only connections are unaffected by resource alarms, so draining a queue during an alarm is still possible.
Monitor alarm state via the management API or metrics and alert before hitting the watermark, since publishers will start timing out once blocked.
Known gotchas
A memory or disk alarm on any single node blocks publishers cluster-wide, not just on the affected node; an undersized node can effectively halt ingestion for the whole cluster.
A disk_free_limit set too low can let disk usage grow dangerously close to full before publishers are blocked; RabbitMQ's own guidance is to size it near the memory high watermark rather than leaving it minimal.
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