Question

3

Network booting couldn't find kernel image

rated 0 times [ 3] [ 0] / answers: 1 / hits: 12619 / 3 Years ago, mon, september 13, 2021, 7:18:28

I have a problem with PXE booting. I followed these instructions on the Ubuntu help wiki. But I get an error on client machine:

Could not find kernel image: vmlinuz-3.13.0-24-generic

And now, question. This image should be in pxelinux.cfg folder, am I right?

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overine

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answered 3 Years ago pheter · Accepted Answer

The kernel image (and initrd) must be located relative to the root folder. If you follow that how-to, then you have configured the following parameters:

DHCP server is configured to use /tftpboot/

The boot image is /pxelinux.0 (relative to the TFTP root directory, so the actual path is /tftpboot/pxelinux.0)

PXELinux (part of syslinux) looks for its configuration in the /pxelinux.cfg/ directory. If it does not find a file matching the client MAC address or GUID, then it will fallback to a file named default (/tftpboot/pxelinux.cfg/default) in your case.

That file should contain something like:
```
LABEL linux

  KERNEL vmlinuz

  INITRD initrd

  APPEND root=...
```
The vmlinuz and initrd files are then looked up relative to the TFTP root directory, so ensure that the file /tftpboot/vmlinuz and /tftpboot/initrd exist. You can find these files in /boot/.

I would also suggest not to use /tftpboot/ as root directory for TFTP files, but /srv/tftpboot/. That is a more suitable location for site-specific data.

For debugging, be sure to have a look at your syslog. I have used the dnsmasq DHCP server which sends its logs to syslog (/var/log/syslog). ISC's DHCP sever should do something similar.