CODEWITHSUNDEEP
rabbitmq
Ish
Ish

Reputation: 2105

RabbitMQ Cannot connect the node in the cluster

I have 2 nodes and I wanna make cluster out of it. I have installed RabbitMq.

Now I am stopping the rabbit app in 2nd node and trying to join cluster like below command: sudo rabbitmqctl join_cluster rabbit@rabbit1

But it throw below error

> DIAGNOSTICS
> ===========
> 
> attempted to contact: [rabbit@TELXRMQ01]
> 
> rabbit@rabbit1:   * unable to connect to epmd (port 4369) on rabbit1:
> nxdomain (non-existing domain)
> 
> 
> current node details:
> - node name: 'rabbitmq-cli-34@rabbit2'
> - home dir: /var/lib/rabbitmq
> - cookie hash: A85MNn8I1UhtrGozi+m/2g==

I am following this link : https://www.rabbitmq.com/clustering.html The errang cookie are same in both the node and 4369 port is open in both the node.

Upvotes: 2

Views: 9257

Answers (3)

CHENJIAN
CHENJIAN

Reputation: 1940

There are many ways to solved this problem.

Under RabbitMQ-3.6.9 and Erlang v8.3.3

  • Correct and Same the file of .erlang.cookie

    chgrp rabbitmq /var/lib/rabbitmq/.erlang.cookie
chown rabbitmq /var/lib/rabbitmq/.erlang.cookie
chmod 400 /var/lib/rabbitmq/.erlang.cookie

  • Correct Hosts and Hostname

    • Hosts:

      cat /etc/hosts

      Result:

      127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

127.0.0.1     rabbitmq252
192.168.4.249 rabbitmq249
192.168.4.251 rabbitmq251
192.168.4.252 rabbitmq252

    • Hostname:

      cat /etc/hostname

      Result:

      rabbitmq252

  • Remove Cluster Node

    If the cluster already has the node, or status changed, or even some node disagree the other node. You can remove the node by the command:

    rabbitmqctl forget_cluster_node rabbit@rabbitmq252

  • Clear Erlang Mnesia Database

    Under the file path of /var/lib/rabbitmq/, there are three files, like erl_crash.dump mnesia .erlang.cookie.

    rm -rf /var/lib/rabbitmq/*

  • Kill the process of rabbitmq

    ps aux|grep rabbitmq
kill -9 remaining_process

  • Reinstall RabbitMQ and Erlang

Anyway, if you encounter the problem, you should:

  1. Read the status of service

    systemctl status rabbitmq-server.service -l
# or
service rabbitmq-server status
# or
journalctl -ex

  2. Read the logs of service

    You can find the path under the status of service.

    cat /var/log/rabbitmq/[email protected]
# or
cat /var/log/rabbitmq/[email protected]

  3. Read the status of ports

    netstat -ntlp

Upvotes: 5

ashim888
ashim888

Reputation: 206

It also depends on the version so you have to use either join_cluster or cluster

Upvotes: 0

Ish
Ish

Reputation: 2105

I solved this by adding host in /etc/hosts file.

Upvotes: 0

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