Open Stack

Thanks Kris that’s good information will try out your suggestions
Ajay


From: "Kris G. Lindgren" <klindgren at godaddy.com<mailto:klindgren at godaddy.com>>
Date: Thursday, April 21, 2016 at 12:08 PM
To: Ajay Kalambur <akalambu at cisco.com<mailto:akalambu at cisco.com>>, "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo

We just use heartbeat.  But from what I recall other people have good luck with both set. I would keep them if they are already set , maybe just dial down how aggressive they are.  One thing I should mention is that if you have a large number of RPC workers, enabling heartbeats will increase cpu consumption about 1-2% per worker (in our experience).  Since its now doing something with rabbitmq every few seconds.  This can also increase load on the rabbitmq side as well.  For us having a stable rabbit environment is well worth the tradeoff.

___________________________________________________________________
Kris Lindgren
Senior Linux Systems Engineer
GoDaddy

From: "Ajay Kalambur (akalambu)" <akalambu at cisco.com<mailto:akalambu at cisco.com>>
Date: Thursday, April 21, 2016 at 1:04 PM
To: "Kris G. Lindgren" <klindgren at godaddy.com<mailto:klindgren at godaddy.com>>, "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo

Do you recommend both or can I do away with the system timers and just keep the heartbeat?
Ajay


From: "Kris G. Lindgren" <klindgren at godaddy.com<mailto:klindgren at godaddy.com>>
Date: Thursday, April 21, 2016 at 11:54 AM
To: Ajay Kalambur <akalambu at cisco.com<mailto:akalambu at cisco.com>>, "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo

Yea, that only fixes part of the issue.  The other part is getting the openstack messaging code itself to figure out the connection its using is no longer valid.  Heartbeats by itself solved 90%+ of our issues with rabbitmq and nodes being disconnected and never reconnecting.

___________________________________________________________________
Kris Lindgren
Senior Linux Systems Engineer
GoDaddy

From: "Ajay Kalambur (akalambu)" <akalambu at cisco.com<mailto:akalambu at cisco.com>>
Date: Thursday, April 21, 2016 at 12:51 PM
To: "Kris G. Lindgren" <klindgren at godaddy.com<mailto:klindgren at godaddy.com>>, "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo

Trying that now. I had aggressive system keepalive timers before

net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_time = 5


From: "Kris G. Lindgren" <klindgren at godaddy.com<mailto:klindgren at godaddy.com>>
Date: Thursday, April 21, 2016 at 11:50 AM
To: Ajay Kalambur <akalambu at cisco.com<mailto:akalambu at cisco.com>>, "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo

Do you have rabbitmq/oslo messaging heartbeats enabled?

If you aren't using heartbeats it will take a long time  for the nova-compute agent to figure out that its actually no longer attached to anything.  Heartbeat does periodic checks against rabbitmq and will catch this state and reconnect.

___________________________________________________________________
Kris Lindgren
Senior Linux Systems Engineer
GoDaddy

From: "Ajay Kalambur (akalambu)" <akalambu at cisco.com<mailto:akalambu at cisco.com>>
Date: Thursday, April 21, 2016 at 11:43 AM
To: "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo


Hi
I am seeing on Kilo if I bring down one contoller node sometimes some computes report down forever.
I need to restart the compute service on compute node to recover. Looks like oslo is not reconnecting in nova-compute
Here is the Trace from nova-compute
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 156, in call
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db     retry=self.retry)
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 90, in _send
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db     timeout=timeout, retry=retry)
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 350, in send
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db     retry=retry)
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 339, in _send
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db     result = self._waiter.wait(msg_id, timeout)
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 243, in wait
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db     message = self.waiters.get(msg_id, timeout=timeout)
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 149, in get
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db     'to message ID %s' % msg_id)
2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db MessagingTimeout: Timed out waiting for a reply to message ID e064b5f6c8244818afdc5e91fff8ebf1


Any thougths. I am at stable/kilo for oslo

Ajay

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