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Re: [Rdo-list] Concerning Rabbits



A new wiki page is available here:

http://openstack.redhat.com/RabbitMQ



On Tue, Feb 04, 2014 at 11:44:20AM -0600, Ryan O'Hara wrote:
> On Tue, Feb 04, 2014 at 12:28:31PM -0500, John Eckersberg wrote:
> > (In the spirit of "Concerning Hobbits")
> 
> Thanks for kicking off this thread.
> 
> > Ryan O'Hara and I have been investigating RabbitMQ as it pertains to RDO
> > recently.  There has been a lot of discussion on several disparate
> > threads, so I wanted to try and capture it on the list for the benefit
> > of everyone.
> > 
> > Ryan has been working on getting RabbitMQ running in a multi-node HA
> > configuration.  I won't steal his thunder, and he can speak to it better
> > than I can, so I'll defer to him on the details.
> 
> Right now I have a 3-node RabbitMQ cluster with mirrored queues. I
> also put haproxy in front of this cluster and pointed all relevant
> OpenStack services at the virtual IP address. This seems to work well
> so far. Details instructions coming soon.
> 
> > As for me, I've been working on el7 support and bug squashing along the
> > way.
> > 
> > The first bug[1] causes the daemon to load incredibly slow, or outright
> > fail by timing out.  This is due to the SELinux policy disallowing
> > name_bind on ports lower than 32768.  RabbitMQ tries to name_bind to a
> > port starting at 10000, and increments if it fails.  So if you have
> > SELinux in enforcing mode, you'll get 22768 AVC denials in the log
> > before it finally starts.
> > 
> > The second bug[2] causes the daemon to intermittently fail to start due
> > to a race condition in the creation of the erlang cookie file.  This
> > happens only the first time the service starts.  Really this is an
> > Erlang bug, but there's a workaround for the RabbitMQ case.
> > 
> > I've submitted patches for both issues.  Until those get merged in, I've
> > rebuilt[3] RabbitMQ for F20 which includes the fixes.
> 
> Awesome.
> 
> > Beyond bugs, I've also built out RabbitMQ and all the build/runtime
> > dependencies for el7.  I have a yum repo[4] on my fedorapeople page
> > containing all the bits.  This is all the stuff that is presently
> > missing from EPEL7.  In time, I would hope the maintainers build all
> > this stuff, but for now it'll work for testing.  You will also need the
> > EPEL 7 Beta repository[5] enabled.
> > 
> > As a side note, I built everything using mock with a local override repo
> > on my workstation.  I've not used copr before but it seems relevant to
> > this sort of thing, so if it's any benefit I'll look to rebuilt the el7
> > stack there for easier consumption.
> > 
> > Hopefully this helps get the discussion into one place, and provide a
> > baseline for further investigation by everyone interested in RabbitMQ.
> 
> John and I will be putting all of this in a wiki page on the RDO
> website in the very near future. I'll send email to the list when it
> is ready to be reviewed.
> 
> Ryan
> 
> > John.
> > 
> > ---
> > [1] Is really two bugzillas, but the same bug:
> > [1a] https://bugzilla.redhat.com/show_bug.cgi?id=998682
> > [1b] https://bugzilla.redhat.com/show_bug.cgi?id=1032595
> > [2] https://bugzilla.redhat.com/show_bug.cgi?id=1059913
> > [3] http://jeckersb.fedorapeople.org/rabbitmq-server-3.1.5-3.fc20.noarch.rpm
> > [4] http://jeckersb.fedorapeople.org/rabbitmq-el7/
> > [5] http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/
> > 
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> > Rdo-list redhat com
> > https://www.redhat.com/mailman/listinfo/rdo-list
> 
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