Netbooting (PXE) with AstLinux

As we have already a working DHCP- and TFTP-server, it is really easy to add the Netbooting feature (PXE) to AstLinux.

I ¹⁾ prepared a package (80 kB) from the Syslinux-4.05 source, which you can download here, and then just throw the content of this package into the Root of your AstLinux TFTP server /tftpboot/ (without the enclosing folder).

Then you only need to add the following line to your Dnsmasq configuration: /mnt/kd/dnsmasq.static (in the WebGUI Edit-tab):

dhcp-boot=pxelinux.0

and perform a “Restart DNS & DHCP”. I included a sample boot menu, which now lives in /tftpboot/pxelinux.cfg/default.

If you are lazy like me , just move this file as pxe-default.conf to /mnt/kd/ and make a symlink like:

ln -s /mnt/kd/pxe-default.conf /tftpboot/pxelinux.cfg/default

to make the file file editable in the WebGUI.

If you want to try out the memtest example you can just make another symlink:

ln -s /oldroot/cdrom/memtest /tftpboot/memtest

and now you can use Memtest86+ via netbooting. It even works with RUNNIX, so that would be an easy way to get an AstLinux image on boxes without CF, CD-ROM or harddrive like ThinClients. Or you could repair broken AstLinux installations and much more.

Please note that you now can even netboot complete ISOs²⁾ over PXE (see my example). And they don't even need to be stored locally on your AstLinux box. Pxelinux supports access via TFTP, HTTP, FTP, NFS, etc. See the Syslinux Wiki for further documentation or google the web, there are many examples.

Please be careful what exactly you symlink to “/tftpboot”. For local files “/tftpboot” is the root directory for PXE. For security reasons all menu entries and especially the menu line editing feature and escaping to a “boot:” prompt (with TAB/ESC) can be password protected (clear-text, MD5, SHA1). You could also comment out the above line in dnsmasq.static and only activate this feature, when you really need it.