Re: [Openstack-operators] RabbitMQ 3.6.x experience?

[Sam Morrison]

We’ve been running 3.6.5 for sometime now and it’s working well.

3.6.1 - 3.6.3 are unusable, we had lots of issues with stats DB and other 
weirdness. 

Our setup is a 3 physical node cluster with around 9k connections, average 
around the 300 messages/sec delivery. We have the stats sample rate set to 
default and it is working fine.

Yes we did have to restart the cluster to upgrade.

Cheers,
Sam



> On 6 Jan 2017, at 5:26 am, Matt Fischer  wrote:
> 
> MIke,
> 
> I did a bunch of research and experiments on this last fall. We are running 
> Rabbit 3.5.6 on our main cluster and 3.6.5 on our Trove cluster which has 
> significantly less load (and criticality). We were going to upgrade to 3.6.5 
> everywhere but in the end decided not to, mainly because there was little 
> perceived benefit at the time. Our main issue is unchecked memory growth at 
> random times. I ended up making several config changes to the stats collector 
> and then we also restart it after every deploy and that solved it (so far). 
> 
> I'd say these were my main reasons for not going to 3.6 for our control nodes:
> In 3.6.x they re-wrote the stats processor to make it parallel. In every 3.6 
> release since then, Pivotal has fixed bugs in this code. Then finally they 
> threw up their hands and said "we're going to make a complete rewrite in 
> 3.7/4.x" (you need to look through issues on Github to find this discussion)
> Out of the box with the same configs 3.6.5 used more memory than 3.5.6, since 
> this was our main issue, I consider this a negative.
> Another issue is the ancient version of erlang we have with Ubuntu Trusty 
> (which we are working on) which made upgrades more complex/impossible 
> depending on the version.
> Given those negatives, the main one being that I didn't think there would be 
> too many more fixes to the parallel statsdb collector in 3.6, we decided to 
> stick with 3.5.6. In the end the devil we know is better than the devil we 
> don't and I had no evidence that 3.6.5 would be an improvement.
> 
> I did decide to leave Trove on 3.6.5 because this would give us some bake-in 
> time if 3.5.x became untenable we'd at least have had it up and running in 
> production and some data on it.
> 
> If statsdb is not a concern for you, I think this changes the math and maybe 
> you should use 3.6.x. I would however recommend at least going to 3.5.6, it's 
> been better than 3.3/3.4 was.
> 
> No matter what you do definitely read all the release notes. There are some 
> upgrades which require an entire cluster shutdown. The upgrade to 3.5.6 did 
> not require this IIRC.
> 
> Here's the hiera for our rabbit settings which I assume you can translate:
> 
> rabbitmq::cluster_partition_handling: 'autoheal'
> rabbitmq::config_variables:
>   'vm_memory_high_watermark': '0.6'
>   'collect_statistics_interval': 3
> rabbitmq::config_management_variables:
>   'rates_mode': 'none'
> rabbitmq::file_limit: '65535'
> 
> Finally, if you do upgrade to 3.6.x please report back here with your results 
> at scale!
> 
> 
> On Thu, Jan 5, 2017 at 8:49 AM, Mike Dorman  > wrote:
> We are looking at upgrading to the latest RabbitMQ in an effort to ease some 
> cluster failover issues we’ve been seeing.  (Currently on 3.4.0)
> 
>  
> 
> Anyone been running 3.6.x?  And what has been your experience?  Any gottchas 
> to watch out for?
> 
>  
> 
> Thanks,
> 
> Mike
> 
>  
> 
> 
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[Openstack-operators] Barbican

[aishwarya.adyanthaya]

Hi,

I have tried installing barbican in my OpenStack setup but when I try to 
db_sync it, it gives me the error 'No passwd entry for user 'barbican''. Could 
someone guide me on how to resolve it.

Thank you.



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