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