Arie Bregman

Linux And Stuff

Tag: debug

Openstack Neutron: troubleshooting and solving common problems

Important note: this post is based on the great sessions I Can’t Ping My VM! Learn How to Debug Neutron and Solve Common Problems of Rossella Sblendido & OpenStack Neutron Troubleshooting by Assaf Muller . So the credit goes to them. I simply gathered it here in a written form and added little bit of description and examples.  Enjoy =)

Common problems classification

The problems you may experience can be divided into several categories:

  • Misconfiguration –  you may experience issues due to inadequate configuration you put in the config files used by neutron. Wrong usage of the configuration tools may also be relevant and cause some issues. In addition, misconfigured underlying network will affect neutron functionality as every packet goes eventually through the physical. For example, it can be external network that isn’t reachable or firewall rule that is blocking traffic from your VMs or to them. So if the underlying network isn’t working, neutron will also fail to work properly.
  • Bug in the code – you may found a bug in the code. Good chances you are not the first to bump into this bug so it’s worth checking here if someone already reported it. If you can’t find the bug there, they you are probably the first one to catch it and you should report it so that the developers can start fixing it.

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Openstack: How to debug neutron with pdb

When I was much younger and foolish (last month), I tried to debug neutron network creation, by inserting ‘import pdb; pdb.set_trace()’ to  /usr/lib/python2.7/site-packages/neutron/db/db_base_plugin_v2.py and simply create network, waiting for pdb to take action. But that didn’t happen. I had to guess it will not work since neutron-server starts as a daemon, and not owned by the terminal. So using the pdb.set_trace() had no effect.

The right way would be to start neutron-server directly and not by starting the service. Don’t worry, we’ll do it together. step by step.

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