automatically register system with collins and provide ipxe configs from asset attributes

This Docker container uses dnsmasq to PXE chainload iPXE which gets its config via banksman from collins node attributes.

As usual:

$ sudo docker build -t collins-pxe .

First you need to start a collins container. This example expects your container to be called collins-server.

Now you can start the collins-pxe container and point it to collins:

$ docker run --net host -e collins-pxe collins-host:9000 10.20.0.1/24 eth0

Since the container acts as a dhcp server, we need to use Docker's host networking (-net host).

If you need to pass custom config to banksman, you can set the BANKSMAN_OPT env variable.

For adding ipxe configurations, see banksman documentation.