[openstack-dev] [nova] remote debugging hangs nova-compute
steve.noyes at oracle.com
Thu Dec 8 14:49:26 UTC 2016
Hi, I've been trying to get nova-compute (devstack, Newton, all-in-one)
to work with the remote debugger in eclipse/pydev. (I've also tried
pyCharm with the same results.) Following instructions here:
I see the message in the nova code about results being unpredictable
when you do this, so I'd like to know if this is expected or if I'm
doing something wrong.
I am starting nova-compute in devstack with these switches:
--remote_debug-host 192.168.9.94 --remote_debug-port 5678
Nova-compute starts up ok and then as expected hits its embedded
LOG.warning(_LW('WARNING: Using the remote debug option changes how '
'Nova uses the eventlet library to support async
IO. This '
'could result in failures that do not occur under
'operation. Use at your own risk.'))
which so far is all good. I see the breakpoint and I can see all the
variables in the debugger.
But when I resume execution, several more log messages are outputted,
and then nova-compute hangs. The last line in the log is:
... Connecting to libvirt: qemu:///system from (pid=556)
At this point I can't ^c the process and the only way to get going again
is to kill nova-compute from the command line.
I am guessing that this hang is due to some debugger/eventlet conflict
as mentioned in that log message. Or am I missing some configuration
step? If this isn't going to work, what do other people recommend for
debugging nova-compute? Thanks,
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