If a machine is using the switchable bootloader support and pxelinux.0 is picked as the boot loader (that is, Beaker makes bootloader/<fqdn>/image a symlink to ../../pxelinux.0) then it will try to load kernel+initrd from the wrong path: bootloader/<fqdn>//images/test3.dcallagh.beakerdevs.lab.eng.bne.redhat.com/kernel Maybe only affects pxelinux 4.0+ since I noticed this in my Beaker environment (using latest syslinux package from RHEL6) whereas in our other environments I *think* we don't see this problem, and we are using older pxelinux there. Need to double-check. According to http://www.syslinux.org/wiki/index.php/PXELINUX#Filename_syntax prepending :: to the filenames will make pxelinux ignore the "root" prefix and actually fetch the path that is given as is. This works for pxelinux 4.0. However we would have to check exactly which pxelinux versions that is applicable to before we switched Beaker's netboot configs over to using that.