[rabbitmq-discuss] Configuring RabbitMQ to support change in hostname

Tue Apr 2 20:29:16 BST 2013

I noticed that names of log files, DB etc. are created from node-name. 
Node-name itself is created based on hostname by default. So, if hostname 
changes, node-names changes and so do the DB, logs etc.

My idea was to fix the node-name and make it independent of the hostname, 
thus fixing the names of DB and logs. But, if I try to use a clustered or 
federated setup, the multiple RabbitMQ instances will need to talk to each 
other and I cannot use the same fixed node-name for all the instances. To 
solve that, I thought I will generate the node-name at first boot of the 
RabbitMQ server (and not change it ever). Random-string was just to ensure 
that all RabbitMQ instances get unique node-names.

From: rabbitmq-discuss-bounces at lists.rabbitmq.com 
[mailto:rabbitmq-discuss-bounces at lists.rabbitmq.com] On Behalf Of Tim Watson
Sent: Tuesday, April 02, 2013 11:59 AM
To: Discussions about RabbitMQ
Cc: Discussions about RabbitMQ
Subject: Re: [rabbitmq-discuss] Configuring RabbitMQ to support change in 
hostname

Hi

On 2 Apr 2013, at 19:44, Kapil Goyal <goyalk at vmware.com> wrote:

So, RabbitMQ does not really support change in hostname at all without 
losing existing data. Is that correct?

Erm not quite - if you copy/rename the mnesia directory you can work around 
this. The node name is dev1 then you can rename/move directories to 
something else (or override directory names to use something that isn't 
bound to the node name if you prefer). I don't see how your proposed use of 
a

Random stein would make any different though.

From: rabbitmq-discuss-bounces at lists.rabbitmq.com 
[mailto:rabbitmq-discuss-bounces at lists.rabbitmq.com] On Behalf Of Tim Watson
Sent: Tuesday, April 02, 2013 4:31 AM
To: Discussions about RabbitMQ
Cc: Discussions about RabbitMQ
Subject: Re: [rabbitmq-discuss] Configuring RabbitMQ to support change in 
hostname

On 29 Mar 2013, at 23:18, Kapil Goyal <goyalk at vmware.com> wrote:

 am thinking of solving it by replacing rabbit at localhost with rabbit@<random 
string> before RabbitMQ starts for the first time. Does <random string> have 
to be DNS resolvable?

Yes. It needs to be the proper hostname for the node.

From: rabbitmq-discuss-bounces at lists.rabbitmq.com 
[mailto:rabbitmq-discuss-bounces at lists.rabbitmq.com] On Behalf Of Dushin 
Fred
Sent: Thursday, March 28, 2013 6:44 PM
To: Discussions about RabbitMQ
Subject: Re: [rabbitmq-discuss] Configuring RabbitMQ to support change in 
hostname

See

http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2013-February/025368.html

On Mar 28, 2013, at 4:53 PM, Kapil Goyal <goyalk at vmware.com> wrote:

RabbitMQ creates a new database if hostname is changed (as documented at 
<http://www.rabbitmq.com/ec2.html> http://www.rabbitmq.com/ec2.html).

I need to support the hostname change on my RabbitMQ server without 
impacting its functioning. Can I accomplish this by setting the NODENAME 
environment variable in rabbitmq-env.conf. It seems from rabbitmq-server 
script that names of database, logs etc. try to use this variable before 
resorting to using hostname. Is this the right approach? Are there any 
side-effects to look out for?

Thanks

Kapil Goyal

Sr. MTS

VMware Inc.

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