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RabbitMQ Error: Unable to Connect to Nodes: nodedown

I am trying to perform clustering using two instances of Rhel. I can ping each other, and even when I try to use the command empd -names, I get that it is running and running on 4369. When I use the command as sudo rabbitmqctl join_cluster rabbit@ip-10-23-20-36, I get the following error, First I stop.

sudo rabbitmqctl join_cluster rabbit@ip-10-23-20-36

Clustering node 'rabbit @ ip-10-23-20-36' with 'rabbit @ ip-10-23-209-142' ... Error: cannot connect to nodes ['rabbit @ ip-10-23-209- 142 ']: nodedown

DIAGNOSTICS

tried to contact: ['rabbit @ ip-10-23-209-142']

rabbit @ f-10-23-209-142: * cannot connect to epmd (port 4369) on ip-10-23-209-142: nxdomain (non-existent domain)

current node information: - node name: 'rabbitmq-cli-80 @ ip-10-23-20-36' - home dir: / var / lib / rabbitmq - cookie hash: u7nRIpJ40Fd356iLbkDO6Q ==

Things I've already tried:

  • Checked cookie name, which is the same in both cases using     sudo cat /var/lib/rabbitmq/.erlang.cookie.
  • Also changed epmd port export ERL_EMPD_PORT=4370
  • netstat -an |grep 4369 | grep -i listen
  • Change host names, as well as in the plugin management GUI.

  • The changed owner and permission also use

    sudo chown rabbitmq:rabbitmq /var/lib/rabbitmq/.erlang.cookie
sudo chmod 400 /var/lib/rabbitmq/.erlang.cookie

  • Add port

    sudo iptables -I INPUT -p tcp --dport 4369 --syn -j ACCEPT

  • sudo rabbitmqctl status

    {listeners,[{clustering,25672,"::"},{amqp,5672,"::"}]},

* IP Addresses are exemplary addresses.

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2 answers

As the error message says, your hostnames are not resolved:

rabbit@ip-10-23-209-142: * unable to connect to epmd (port 4369) on ip-10-23-209-142: nxdomain (non-existing domain)

DNS /etc/hosts . , , . (1):

ping ip-10-23-209-142 # from ip-10-23-20-36
+7

, .

, -, /var/log/rabbitmq/rabbitmq @[ ].log . , .

/var/db/rabbitmq/mnesia/rabbit @www/cluster_nodes.config

 Error description:


{error,{cannot_read_file,"/var/db/rabbitmq/mnesia/rabbit@www/cluster_nodes.config",
                        {1,erl_parse,["syntax error before: ","'@'"]}}}

, /var/db/rabbitmq/mnesia/rabbit @www ,

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