rabbitmq-server fails to start after hostname has changed for first time

Question

I am using django-celery for my django project. Last day I have changed my computer\'s hostname (I am using Ubuntu 12.04, edited file \'/etc/hostname\'), and after next restart

Answer 1

When on Windows (sorry about that - I understand the topic is for Ubuntu) just reinstall the RabbitMQ service:

rabbitmq-service.bat remove
rabbitmq-service.bat install

The script is located at C:\Program Files\RabbitMQ Server\rabbitmq_server-<version>\sbin folder.

Or may be just changing the value of HKEY_LOCAL_MACHINE\SOFTWARE\Ericsson\Erlang\ErlSrv\1.1\RabbitMQ\@SName is enough.

Clues: https://github.com/rabbitmq/rabbitmq-server/issues/620

Answer 2

Check qpidd daemon, it could be also already hogging the port that rabbitmq needs.

sudo netstat -lnp

Answer 3

On Windows, the issue I was facing was due to the McAfee firewall. The exact error was:

epmd error for host "<HOSTNAME>": address (cannot connect to host/port)

It started working as soon as I disabled the firewall

Answer 4

Richard's answer is good, but you might lose some information in the rabbitmq queues. The following is a possible way to preserve the previous setup of rabbitmq with the new host name.

A Short Answer:

If you want to keep the new host name change, then you can create a rabbitmq-env.conf files in /etc/rabbitmq that references the old host name and all should be good. The following is what should be in the rabbitmq-env.conf file:

NODENAME=rabbit@OLDHOSTNAME

After adding the config file, restart the rabbitmq server then you should be good. (e.g. service rabbitmq-server restart (might need a sudo with ubuntu))

For more details you can read from the rabbitmq website: https://www.rabbitmq.com/man/rabbitmq-env.conf.5.man.html

More Details About the Answer:

I had a similar hostname issues using CentOS... The root issue was when rabbit installs, it references the current host name at the time of install. Since this is a rabbitmq thing, the solution should work for other linux flavors. If you want to see the full answer, you can see it at: rabbtimqadmin - Could not connect: [Errno -2] Name or service not known

Answer 5

My solution was to check and correct the $HOSTNAME and /etc/hostname. It turned out that my router was a little confused and gave me a wrong hostname domain. After restarting this one, I called export HOSTNAME=the.correct.hostname and my rabbit runs without restarting the server os.

Answer 6

You could solve this problem by either deleting the erlang mnesia database associated with rabbitmq or reinstalling rabbitmq.

I got hint for first solution from rabbitmq mailing list. Excerpt from answer, The Erlang Mnesia database is host specific (because it is a distributed DB). The simplest way to get you fixed is to clear out the database dir.

The second method is the easiest way (not recommend though). To uninstall do

dpkg -P rabbitmq-server

You can refer this link if you would like to know more about installing/removing debian packages.