You want to ensure a queue named task_queue is mirrored on at least 3 nodes but no more than 5 using a range specification in ha-params. Which policy configuration achieves this?

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RabbitMQ - Clustering

You want to ensure a queue named task_queue is mirrored on at least 3 nodes but no more than 5 using a range specification in ha-params. Which policy configuration achieves this?

Arabbitmqctl set_policy ha-range "^task_queue$" '{"ha-mode":"nodes","ha-params":["node1","node2","node3"]}'

Brabbitmqctl set_policy ha-minmax ".*" '{"ha-mode":"exactly","ha-params":3}'

Crabbitmqctl set_policy ha-minmax "^task_queue$" '{"ha-mode":"nodes","ha-params":["node1","node2","node3","node4","node5"]}'

Drabbitmqctl set_policy ha-minmax "^task_queue$" '{"ha-mode":"exactly","ha-params":"3-5"}'

Step-by-Step Solution

Solution:

Step 1: Understand ha-mode 'exactly' with range ha-params
ha-mode 'exactly' with ha-params as string like '3-5' dynamically mirrors the queue on a number of replicas between 3 and 5.
Step 2: Identify correct command
rabbitmqctl set_policy ha-minmax "^task_queue$" '{"ha-mode":"exactly","ha-params":"3-5"}' matches the queue exactly and uses range specification.
Step 3: Check other options
B uses fixed exactly 3 on all queues; C uses fixed nodes list of 5; D uses fixed nodes list of 3.
Final Answer:
rabbitmqctl set_policy ha-minmax "^task_queue$" '{"ha-mode":"exactly","ha-params":"3-5"}' -> Option D
Quick Check:
ha-mode exactly + ha-params "3-5" = dynamic range 3-5 [OK]

Quick Trick: Use ha-mode 'exactly' with ha-params "3-5" for range [OK]

Common Mistakes:

MISTAKES

Using 'exactly' with fixed integer instead of range string
Not matching queue name exactly
Using 'nodes' mode with fixed list instead of range

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You want to ensure a queue named task_queue is mirrored on at least 3 nodes but no more than 5 using a range specification in ha-params. Which policy configuration achieves this?

Step 1: Understand ha-mode 'exactly' with range ha-params

Step 2: Identify correct command

Step 3: Check other options

Final Answer:

Quick Check:

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