Memory and disk alarms in RabbitMQ - Cheat Sheet & Quick Revision

Recall & Review

beginner

What triggers a memory alarm in RabbitMQ?

A memory alarm is triggered when RabbitMQ's used memory exceeds the configured memory high watermark, which is a limit set to prevent the server from running out of memory.

beginner

What happens when a disk alarm is raised in RabbitMQ?

When a disk alarm is raised, RabbitMQ stops accepting new messages to prevent running out of disk space, ensuring stability and data integrity.

intermediate

How can you check the current memory alarm status in RabbitMQ?

You can check the memory alarm status using the command: rabbitmqctl status or by inspecting the management UI under the node's overview section.

intermediate

Which configuration setting controls the memory high watermark in RabbitMQ?

The memory high watermark is controlled by the setting 'vm_memory_high_watermark' in the RabbitMQ configuration file or environment variables.

beginner

Why is it important to monitor disk space and memory usage in RabbitMQ?

Monitoring disk space and memory usage prevents RabbitMQ from crashing or losing messages by triggering alarms that stop message flow before resources are exhausted.

What does RabbitMQ do when the memory alarm is triggered?

A Restarts the server

B Deletes old messages automatically

C Stops accepting new messages

D Sends an email alert only

When memory alarm triggers, RabbitMQ stops accepting new messages to avoid running out of memory.

Which command helps check RabbitMQ's memory and disk alarm status?

A rabbitmqctl status

B rabbitmqctl list_queues

C rabbitmqctl reset

D rabbitmqctl start_app

The 'rabbitmqctl status' command shows node status including memory and disk alarms.

What is the default action when a disk alarm is raised in RabbitMQ?

A Increase disk space automatically

B Stop accepting new messages

C Delete oldest messages

D Send a warning but continue processing

RabbitMQ stops accepting new messages to prevent disk space exhaustion.

Which configuration parameter sets the memory limit for RabbitMQ alarms?

A heartbeat_interval

B disk_free_limit

C max_connections

D vm_memory_high_watermark

'vm_memory_high_watermark' controls the memory usage limit triggering alarms.

Why should RabbitMQ administrators monitor memory and disk alarms?

A To prevent server crashes and message loss

B To improve message delivery speed

C To reduce network traffic

D To automatically backup messages

Monitoring alarms helps avoid crashes and message loss by managing resource limits.

Explain how RabbitMQ handles memory and disk alarms and why they are important.

Think about what happens when resources run low and how RabbitMQ protects itself.

Describe how to check and configure memory and disk alarms in RabbitMQ.

Consider commands and config settings involved.