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    <p>RabbitMQ Clusters do not work well on unreliable networks (part of RabbitMQ documentation). So when the network failure happens (in a two node cluster) each node thinks that it is the master and the only node in the cluster. Two master nodes don't automatically reconnect, because their states are not automatically synchronized (even in case of a RabbitMQ slave - the actual message synchronization does not happen - the slave just "catches up" as messages get consumed from the queue and more messages get added).</p> <p>To detect whether you have a broken cluster, run the command:</p> <pre><code>rabbitmqctl cluster_status </code></pre> <p>on each of the nodes that form part of the cluster. If the cluster is broken then you'll only see one node. Something like:</p> <pre><code>Cluster status of node rabbit@rabbitmq1 ... [{nodes,[{disc,[rabbit@rabbitmq1]}]},{running_nodes,[rabbit@rabbitmq1]}] ...done. </code></pre> <p>In such cases, you'll need to run the following set of commands on one of the nodes that formed part of the original cluster (so that it joins the other master node (say rabbitmq1) in the cluster as a slave):</p> <pre><code>rabbitmqctl stop_app rabbitmqctl reset rabbitmqctl join_cluster rabbit@rabbitmq1 rabbitmqctl start_app </code></pre> <p>Finally check the cluster status again .. this time you should see both the nodes.</p> <p>Note: If you have the RabbitMQ nodes in an HA configuration using a Virtual IP (and the clients are connecting to RabbitMQ using this virtual IP), then the node that should be made the master should be the one that has the Virtual IP.</p>
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    1. USluksmir
    1. USGur Kamal Singh Badal
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    1. COIs it possible to configure the nodes to DO automatically synchronize their states whenever the network is available again?
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      1. USWiebe Tijsma
    2. CONot to my knowledge (unless this is available in a newer version of RabbitMQ ... I haven't checked for at least a year now).
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      1. USGur Kamal Singh Badal
 

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