To enable a new network manager driver, the only requirement is to make a new directory with the name of the driver in /var/lib/one/remotes/vnm/remotes/<name> with three files:

• Pre: This driver should perform all the network related actions required before the Virtual Machine starts in a host.
• Post: This driver should perform all the network related actions required after the Virtual Machine starts (actions which typically require the knowledge of the tap interface the Virtual Machine is connected to).
• Clean: If any clean-up should be performed after the Virtual Machine shuts down, it should be placed here.

The above three files must exist. If no action is required in them a simple exit 0 will be enough.

Virtual Machine actions and their relation with Network actions:

• Deploy: pre and post
• Shutdown: clean
• Cancel: clean
• Save: clean
• Restore: pre and post
• Migrate: pre (target host), clean (source host), post (target host)
• Attach Nic: pre and post
• Detach Nic: clean

All three driver actions have a first parameter which is the XML VM template encoded in base64 format.

Additionally the post driver has a second parameter which is the deploy-id of the Virtual Machine e.g.: one-17.