Show OVS external-ids

Sun 19 January 2014 by Lars Kellogg-Stedman Tags openstack openvswitch

This is just here as a reminder for me:

An OVS interface has a variety of attributes associated with it, including an external-id field that can be used to associate resources outside of OpenVSwitch with the interface. You can view this field with the following command:

$ ovs-vsctl --columns=name,external-ids …
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Stupid OpenStack Tricks

Thu 16 January 2014 by Lars Kellogg-Stedman Tags openstack tricks

I work with several different OpenStack installations. I usually work on the command line, sourcing in an appropriate stackrc with credentials as necessary, but occasionally I want to use the dashboard for something.

For all of the deployments with which I work, the keystone endpoint is on the same host …

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Direct access to Nova metadata

Tue 14 January 2014 by Lars Kellogg-Stedman Tags openstack

When you boot a virtual instance under OpenStack, your instance has access to certain instance metadata via the Nova metadata service, which is canonically available at

In an environment running Neutron, a request from your instance must traverse a number of steps:

  • From the instance to a router,
  • Through a NAT rule in the router namespace,
  • To an instance of the neutron-ns-metadata-proxy,
  • To the actual Nova metadata service

When there are problem accessing the metadata, it can be helpful to verify that the metadata service itself is configured correctly and returning meaningful information.

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RDO Bug Triage

Mon 13 January 2014 by Lars Kellogg-Stedman Tags openstack redhat

This Wednesday, January 15, at 14:00 UTC (that's 9AM US/Eastern, or date -d "14:00 UTC" in your local timezone) I will be helping out with the RDO bug triage day. We'll be trying to validate all the untriaged bugs opened against RDO.

Feel free to drop by …

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Visualizing Neutron Networking with GraphViz

Mon 23 December 2013 by Lars Kellogg-Stedman Tags openstack neutron networking

I've put together a few tools to help gather information about your Neutron and network configuration and visualize it in different ways. All of these tools are available as part of my neutron-diag repository on GitHub.

In this post I'm going to look at a tool that will help you visualize the connectivity of network devices on your system.

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