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You ran these commands on a new node but it failed to join the cluster:

medium📝 Troubleshoot Q14 of 15
RabbitMQ - Clustering
You ran these commands on a new node but it failed to join the cluster:
rabbitmqctl join_cluster rabbit@node1
rabbitmqctl stop_app
rabbitmqctl start_app
What is the main error?
AYou must stop the app before joining the cluster
BYou must start the app before joining the cluster
CThe join_cluster command is misspelled
DYou cannot join a cluster without restarting the server
Step-by-Step Solution
Solution:
  1. Step 1: Check command order for joining cluster

    The app must be stopped before running join_cluster to avoid errors.
  2. Step 2: Identify the mistake in the sequence

    Here, join_cluster was run before stopping the app, causing failure.
  3. Final Answer:

    You must stop the app before joining the cluster -> Option A
  4. Quick Check:

    Stop app first, then join cluster [OK]
Quick Trick: Always stop app before join_cluster command [OK]
Common Mistakes:
MISTAKES
  • Running join_cluster before stop_app
  • Assuming join_cluster auto-stops app
  • Ignoring command order importance

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