[rabbitmq-discuss] Incompatible Erlang bytecode found on nodes

[Robin Lawrie - HostelBookers]

Hi all,

I've got a problem with a 2 node RabbitMQ cluster I hope someone here can shed some light one.

The cluster is a 2 node cluster and today, one of the nodes was patched and had the following updates installed:

bind-libs.9.8.2.0.17.rc1.el6_4.6.x86_64
bind-utils.9.8.2.0.17.rc1.el6_4.6.x86_64
glibc.2.12.1.107.el6_4.4.i686
glibc.2.12.1.107.el6_4.4.x86_64
glibc-common.2.12.1.107.el6_4.4.x86_64
glibc-devel.2.12.1.107.el6_4.4.x86_64
glibc-headers.2.12.1.107.el6_4.4.x86_64
glibc-utils.2.12.1.107.el6_4.4.x86_64
kernel.2.6.32.358.18.1.el6.x86_64
kernel-devel.2.6.32.358.18.1.el6.x86_64
kernel-firmware.2.6.32.358.18.1.el6.noarch
kernel-headers.2.6.32.358.18.1.el6.x86_64
kpartx.0.4.9.64.el6_4.2.x86_64
prelink.0.4.6.3.1.el6_4.x86_64
rs-tools.0.1.17.2.el6.noarch
sos.2.2.38.el6_4.2.noarch

Upon restarting the patched server, RabbitMQ does not start.

The command "rabbitmqctl status" outputs this:

Status of node 'rabbit at 496407-Cache1' ...
Error: unable to connect to node 'rabbit at 496407-Cache1': nodedown

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

nodes in question: ['rabbit at 496407-Cache1']

hosts, their running nodes and ports:
- 496407-Cache1: [{rabbitmqctl6831,60496}]

current node details:
- node name: 'rabbitmqctl6831 at 496407-Cache1'
- home dir: /var/lib/rabbitmq
- cookie hash: AZGKHAwBPk+imgw09xDBow==

The command "service rabbitmq-server start" shows this:

Starting rabbitmq-server: FAILED - check /var/log/rabbitmq/startup_{log, _err}
rabbitmq-server.

Looking at /var/log/rabbitmq/startup_log I see this:

init terminating in do_boot",{rabbit,failure_during_boot,{error,{incompatible_bytecode,"Incompatible Erlang bytecode found on nodes

The version of elang is the same on both nodes however (This was verified with the command "erl").

I'm absolutely stumped now as I can't find anything about " Incompatible Erlang bytecode found on nodes"

Can anyone help?

Thanks

Robin
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