Grub config for EFI and PXE boot

grub.cfg

set timeout=3

menuentry 'Linux diskless' --class os {

     insmod efi_gop
     insmod efi_uga

     # set server from option 66 (tftp-server-name) if not exist, use next_server
     if ! net_get_dhcp_option net_default_server ${net_default_interface} 66 string; then
         echo '        using next_server option instead.'
         set net_default_server=${pxe_default_server}
     fi

     echo '------------------------------------------------------------------------------'
     echo -n 'Interface:   '; net_ls_addr
     echo "HTTP Server: ${net_default_server}"
     echo '------------------------------------------------------------------------------'

     echo
     echo '    mm'
     echo ' /^(  )^\'
     echo ' \,(..),/'
     echo '   V~~V'
     echo

     echo "Loading Linux from http://${net_default_server}/vmlinz ..."
     linux (http)/vmlinuz console=tty1 console=ttyS0,9600n8 selinux=0 bond=bond0:eno1,eno1d1:mode=active-backup root=live:http://${net_default_server}/cc.squash rootovl=1 ro rd.live.image

     echo "Loading initial ramdisk from http://${net_default_server}/initramfs ..."
     initrd (http)/initramfs
}

Wow, thanks for documenting this! When booting UEFI PXE, TFTP times out when downloading the latest initrd file for Ubuntu 20.04 so HTTP is the only way to go. A google search reveals surprisingly little information on how to fix the problem. This gist helped me figure out how to go around the TFTP limitation.

@ovidiucp, here is the final version used in production for 2 and more years:
https://github.com/kvaps/ltsp/blob/grub/ltsp/server/grub/grub.cfg

If you using Ubuntu, you might be also interesting in LTSP project, I'm using it to organize network bootable servers farm for the Kubernetes https://github.com/kvaps/kubefarm

Wow, thnks

Wow, thanks for documenting this! When booting UEFI PXE, TFTP times out when downloading the latest initrd file for Ubuntu 20.04 so HTTP is the only way to go. A google search reveals surprisingly little information on how to fix the problem. This gist helped me figure out how to go around the TFTP limitation.

chmod +r /yourpxe-bootpath/yourpxe-initrd.img