CODEWITHSUNDEEP
rabbitmqcluster-computing
Abu Muhammad
Abu Muhammad

Reputation: 1185

Can't join rabbitMQ cluster: Error: nodedown

I am new to rabbitMQ and Linux. I am following clustering guide at https://www.rabbitmq.com/clustering.html

I have three nodes all running CentOS 7 (On virtual machines with statics IPs).

I have copied the erlang cookie to all machines.

I have set hosts in hosts file as the following This on machine 2

127.0.0.1   localhost localhost.localdomain localhost4   localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.198.100   rabbit1
127.0.0.1 rabbit2
192.168.198.102   rabbit3

But hen trying to join rabbit2 to rabbit1 using

rabbitmqctl join_cluster rabbit@rabbit1

I get the following error

Clustering node rabbit@localhost with rabbit@rabbit1 ...
Error: unable to connect to nodes [rabbit@rabbit1]: nodedown

DIAGNOSTICS
===========

attempted to contact: [rabbit@rabbit1]

rabbit@rabbit1:
  * connected to epmd (port 4369) on rabbit1
  * epmd reports node 'rabbit' running on port 25672
  * TCP connection succeeded but Erlang distribution failed
  * suggestion: hostname mismatch?
  * suggestion: is the cookie set correctly?
  * suggestion: is the Erlang distribution using TLS?

current node details:
- node name: 'rabbitmq-cli-72@localhost'
- home dir: /var/lib/rabbitmq
- cookie hash: YlXmRhqgpV9H7lgqXslI1g==

Could anyone help me figure out what's wrong with this?

Upvotes: 1

Views: 3699

Answers (2)

cantSleepNow
cantSleepNow

Reputation: 10202

I'm assuming you have set 192.168.198.102 to your rabbit2 VM, so you could try and change the line in /etc/hosts from 127.0.0.1 rabbit2 to 192.168.198.102 rabbit2.

Also a tip, try using docker instead of VMs, it's faster and lighter.

Upvotes: 0

Jean-Sébastien Pédron
Jean-Sébastien Pédron

Reputation: 2137

Your nodes are named rabbit@localhost:

Clustering node rabbit@localhost with rabbit@rabbit1

You need to verify what the hostname command returns. For clustering to work, it must return eg. rabbit1. If it returns localhost, verify the configuration of your hosts. How to do that depends on the distribution.

On the Debian and Fedora VMs I have here, the hostname is configured in /etc/hostname. So you would need something like:

echo rabbit1 > /etc/hostname

But please refer to your distribution documentation and tools first.

Upvotes: 4

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