This container starts a DHCP server and a TFTP server which can be used for booting boards through PXE.

1. Build the container
    - cd into this folder
    - run:
        docker build . -t <CONTAINER_NAME>

2. Start a container with both the DHCP server and TFTP server configured for PXE booting:
    - 4 files are needed:
        - dhcpd.conf - configuration file for the DHCP server (an example is provided in the git repository)
        - pxe.cfg - configuration file for the PXE server (an example is provided in the git repository)
        - bzImage - kernel for the board
        - rootfs.ext4 - root filesystem for the board
    - Edit dhcpd.conf to match the DHCP server configuration that is needed
    - Set an IP address to the interface (named INTERFACE_NAME below) where the DHCP server will be advertised on
    - Run:
        docker run -it --net=host --privileged \
            -v <path to dhcpd.conf>:/etc/dhcp/dhcpd.conf \
            -v <path to pxe.cfg>:/var/lib/tftpboot/pxelinux.cfg/default \
            -v <path to bzImage>:/var/lib/tftpboot/bzImage \
            -v <path to rootfs.ext4>:/var/lib/tftpboot/rootfs.ext4 \
            <CONTAINER_NAME> <INTERFACE_NAME>

    Given that all the required files are in the current working directory and that the container is named "nfv-pxe-boot", a practical example for running on eth2 would be:
        docker run -it --net=host --privileged \
            -v $(pwd)/dhcpd.conf:/etc/dhcp/dhcpd.conf \
            -v $(pwd)/pxe.cfg:/var/lib/tftpboot/pxelinux.cfg/default \
            -v $(pwd)/bzImage:/var/lib/tftpboot/bzImage \
            -v $(pwd)/rootfs.ext4:/var/lib/tftpboot/rootfs.ext4 \
            nfv-pxe-boot eth2

    The -v parameter mounts a file specified at the left of the colon character to the destination specified at the right of the colon character. For example "-v $(pwd)/bzImage:/var/lib/tftpboot/bzImage" evaluates $(pwd)/bzImage and will map the file to /var/lib/tftpboot/bzImage in the container.

    Boot the board with network booting enabled and it should load the configuration set in pxe.cfg.

3. Start a container with only the DHCP server running:
    - Only dhcpd.conf is needed
    - Set an IP address to the interface (named INTERFACE_NAME below) where the DHCP server will be advertised on
    - Run:
        docker run -it --net=host --privileged -v <path to dhcpd.conf>:/etc/dhcp/dhcpd.conf <INTERFACE NAME>