[rabbitmq-discuss] rabbitmq on yocto/openembedded

[Tim Watson]

Hi Tim

On 2 Feb 2013, at 09:20, Tim Coote wrote:

> Looks like the rpm is populated with a minimal erlang subset. Is there a dependency list for rabbitmq on erlang libraries?  I added in mnesia and then found that os_mon was required, so if there's a definitive list, it would save me a few iterations…
> 

Erlang uses the .app resource file to specify dependencies, and Rabbit's lists only those two:

$ cat ~/../../rabbitmq-umbrella/rabbitmq-server/ebin/rabbit.app | grep {applications
     {applications,[kernel,stdlib,sasl,mnesia,os_mon]},
$

If you're using plugins however, you'll need to look at their dependencies too. Both mnesia and os_mon depend only on kernel, stdlib and sasl.

Cheers,
Tim

> Tim
> On 1 Feb 2013, at 13:41, Simon MacMullen <simon at rabbitmq.com> wrote:
> 
>> I don't know if this is a silly mistake somewhere. The error description is 'undef', encountered invoking mnesia:system_info(directory) - i.e. that function wasn't found. Since that's the very first interaction RabbitMQ has with Mnesia, I suspect Mnesia just isn't there at all. I'm not sure I understand how you created the Erlang RPM, but could it be the case that Mnesia wasn't built at all?
>> 
>> Cheers, Simon
>> 
>> On 01/02/13 13:29, Tim Coote wrote:
>>> I think that I've now got Erlang installed - 'hello world' works,
>>> anyway, and openembedded has created what looks like a sensible rpm:
>>> erlang-R15B-r3.armv5te
>>> 
>>> However, the generic unix install seems unable to get going - I get an
>>> erlang crash dump and the /var/log/rabbitmq at nodename does not tell me
>>> very much about where to look, if I start the server with
>>> rabbitmq-server (as user rabbitmq or as user root):
>>> 
>>> [code]
>>> =INFO REPORT==== 31-Jan-2013::22:26:04 ===
>>> Error description:
>>>   undef
>>> 
>>> Log files (may contain more information):
>>>   /var/log/rabbitmq/rabbit at qemuarm.log
>>> <mailto:var/log/rabbitmq/rabbit at qemuarm.log>
>>>   /var/log/rabbitmq/rabbit at qemuarm-sasl.log
>>> <mailto:var/log/rabbitmq/rabbit at qemuarm-sasl.log>
>>> 
>>> Stack trace:
>>>   [{mnesia,system_info,[directory],[]},
>>>    {rabbit_mnesia,ensure_mnesia_dir,0,[]},
>>>    {rabbit_node_monitor,prepare_cluster_status_files,0,[]},
>>>    {rabbit,'-boot/0-fun-1-',0,[]},
>>>    {rabbit,start_it,1,[]},
>>>    {init,start_it,1,[]},
>>>    {init,start_em,1,[]}]
>>> [/code]
>>> 
>>> 
>>> I've checked the file permissions (or got around them by running as
>>> root.)  How do I go about debugging a rabbitmq install?  Are there smoke
>>> tests for erlang/rabbit that I can try that check out the set up? or
>>> something else - the documentation that I've found so far seems to
>>> assume that I can get past this point, so I'd assume that I'm making
>>> some silly mistake somewhere.
>>> 
>>> Tim
>>> On 11 Dec 2012, at 10:07, Alvaro Videla <videlalvaro at gmail.com
>>> <mailto:videlalvaro at gmail.com>> wrote:
>>> 
>>>> Hi,
>>>> 
>>>> I know the Erlang Solutions guys have been playing with Erlang
>>>> Embedded, you can find more info here:
>>>> https://www.erlang-solutions.com/downloads/download-erlang-otp
>>>> 
>>>> I know they also have a github repo for it somewhere.
>>>> 
>>>> Regards,
>>>> 
>>>> Alvaro
>>>> 
>>>> 
>>>> 
>>>> On Tue, Dec 11, 2012 at 11:00 AM, Emile Joubert <emile at rabbitmq.com
>>>> <mailto:emile at rabbitmq.com>> wrote:
>>>> 
>>>> 
>>>>   Hi Tim,
>>>> 
>>>>   On 10/12/12 21:26, Tim Coote wrote:
>>>>> Has anyone got any insights into getting rabbitmq onto an open
>>>>> embedded/yocto linux build?
>>>> 
>>>>   I suspect the biggest challenge will be to get a sufficiently recent
>>>>   version of Erlang installed. Once you have that the generic Unix
>>>>   binary
>>>>   should run just fine.
>>>> 
>>>>   For details about the generic Unix tarball:
>>>>   http://www.rabbitmq.com/install-generic-unix.html
>>>> 
>>>>   For details about required versions of Erlang for various features:
>>>>   http://www.rabbitmq.com/which-erlang.html
>>>> 
>>>> 
>>>> 
>>>>   -Emile
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>>>> 
>>>> 
>>> 
>>> 
>>> 
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>>> 
>> 
>> 
>> -- 
>> Simon MacMullen
>> RabbitMQ, VMware
> 
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