Linuxbridge-agent down, VMs fail with No valid host was found

@jobstfel wrote:

This is a repost of information from another thread http://community.dev-innovate.com/t/salt-master-has-rejected-this-minions-public-key/3665

Linuxbridge agent was not happy - wouldn't come up to in the output of 'nova service-list'. When @nmeadows tried to start up a simulation, the VMs would fail with the error message "state changed from BUILD to ERROR with message: No valid host was found. Exceeded max scheduling attempts 3 for instance e748eec0-95c5-414c-9a7d-77a46518ac77: File "/usr/lib/python2.7/dist-packages/nova/scheduler/manager.py", line 140, in run_instance"

Neil had a bare-metal server with only two ports. For installation, he needed to use the instructions at http://virl-dev-innovate.cisco.com/iso.bm.php and the section 'Prepare for an Interface-Constrained Installation'.

If you subsequently make configuration changes in /etc/virl.ini, turning on dummy interfaces for example, the scripts that then apply those changes do not take into account the configuration that's currently active. When the script runs, it will reconfigure /etc/network/interfaces but those change won't come into effect until the system has been rebooted.

For a period in time, you will have both the original interface settings active and the new interface settings active, until you reboot. On reboot, only the new settings will be active.

If you make changes to the network elements, you need to reset Openstack so that it is up to date with the network changes - this is vital.

The following command sequence was used to bring the system back to operational state:

edit /etc/virl.ini - ensure all of the settings are correct
vinstall vinstall
vinstall salt
sudo salt-call state.sls virl.host <<< this will build the /etc/network/interfaces file
sudo reboot

On reboot

sudo salt-call state.sls openstack
sudo salt-call state.sls openstack.reset
sudo salt-call state.sls openstack-restart

Then check that all openstack services are up and running:

nova service-list
neutron net-list

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