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Friday, January 16, 2015

How to debug OpenStack nova-api

How to debug OpenStack and EC2 APIs

1)
Find "nova-api" process and copy the command

#ps -aux | grep nova-api

2)
Stop "nova-api"

#sudo /etc/init.d/nova-api stop

3)
Add debug statements


a)
Debug EC2 API


Goto:
nova/api/ec2/cloud.py

Add pdb in "run_instances" method:
def run_instances:
    import pdb; pdb.set_trace()

   
b)
Debug OpenStack API


Goto:
nova/api/openstack/compute/servers.py

Add pdb in "create" method:

def create(self, req, body):
    import pdb; pdb.set_trace()


4)
Start "nova-api" using the command you copied

#sudo /usr/bin/nova-api --config-file=/etc/nova/nova.conf

5)
Fire an EC2 or OpenStack API call and start debugging



2 comments:

  1. Find patch of nova-api source code

    >>> import nova
    >>> nova.__file__
    '/usr/lib/python2.7/dist-packages/nova/__init__.pyc'
    >>>

    #cd /usr/lib/python2.7/dist-packages/nova
    #ls
    api ....

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