PXE boot: unable to find boot image

[^rooker]

[PROBLEM]
I had a perfectly working PXE network boot environment, but suddenly, it refused to boot successfully.

The status was as follows:

• The Ubuntu ISO was mounted
• tftp menu was shown
• Boot process began, so it found the kernel in the mounted ISO foler
• Ubuntu splash screen was shown

And then, all of a sudden: It dropped me to a busybox prompt

The cause became clear when looing at "/var/log/daemon.log":

rpc.mountd[2108]: refused mount request from 192.168.1.xx for /srv/tftpboot/iso-mounted/xubuntu-12.04.1-desktop-i386 (/): not exported

The NFS service was not exporting the mounted ISO folder!
TFTP accesses the files directly, but then at a certain point in the boot process, the actual data is accessed over NFS.

[SOLUTION]
Start the NFS services:

Code: Select all

$ service nfs-kernel-server start
$ service nfs-common start

Now it works again