[fog] Fog - Change DHCP Server?

[SWICT]

Hi All,

We have been using Fog (which has been working great) for the past few months, we recently transferred roles to a new 2008 DC and fog has stopped working.

 

Ive added options 66 and 67 into the freshly installed DHCP scope but cant see where to change the settings in Fog itself, am I looking at reinstalling Fog from scratch?

 

Any advice much appreciated

 

Cheers

[morganw]

I don't think you have to change any settings as long as the Fog server didn't used to be your DHCP server. If you've added any roles like WDS then this will probably hijack any PXE boots.

What exactly happens when you network boot something?

[SWICT]

Hey

 

Thanks for the reply, from what I can remember there was an option on installation to point it to our old DHCP server?

 

When I boot now it looks like it trys to get an address, fails and trys to boot from local disk?

 

Cheers

[morganw]

I don't think there are any options you would have to change. If whatever you boot fails to get an IP address then the problem is on your new DHCP server. Perhaps it's been configured to deny pxe-client boots, but with default settings and a valid scope it should just work. If you boot an operating system on the same PC does it get an IP address?

[3s-gtech]

Check the configuration of /var/www/fog/commons/config.php (Debian based OS)

 

I experienced the same thing when moving our IP address range, there are several files that will need updating but I can't remember the others for the life of me.

[SWICT]

Thanks for all the advice thus far guys, Im running on Ubuntu so Ill check out the config file and see if there is anything obvious

 

Ive just tested from xp running the command TFTP servername GET pxelinux.0 and that completes ok as well

[morganw]

The fact you can get the pxelinux.0 file shows that as long as the client is given the correct information it will work. If you've just moved the DHCP server I don't think you'll need to modify any files on the Fog server.

[SWICT]

To add to this after checking the configuration of /var/www/fog/commons/config.php

 

The only reference I can find to the old server is the following line;

 

"PXE_IMAGE_DNSADDRESS", "10.74.202.X"

 

Ive changed this to reflect the new server ip restarted fog so we'll see what happens!

[SWICT]

Ok hasnt made the slightest bit of difference, same behaviour as before

 

When booting to an os the device pulls a valid DHCP address no problems both via wireless and wired

 

Fog itself was working fine, anything else you guys can think of for me to check?

[morganw]

What DHCP options have you got set?

Also, did you specify option 066 with a hostname or did you use an IP address?

[SWICT]

Have only got options 66 and 67 set in DHCP, option 60 doesnt exist

 

In option 66 Ive specified the ip of the fog server, can login to the management interface just fine

 

Cheers

[morganw]

What happens on the client? Do you get TFTP timeout or something similiar, or does it not even try to connect to the TFTP server?

[SWICT]

Its boots to PXE boot, looks like it fails to get a DHCP address and fog sits at booting from local disk, usually I would have the fog menu and be able to select the task etc

 

No error as such or if it does it flashes up too quickly to see!

[morganw]

and fog sits at booting from local disk

...so you see the Fog menu? That means the TFTP stuff is working correctly.

[SWICT]

Not the usual menu Id expect to see, Ive attached some screenshots of what actually happens.......hope this makes it clearer

[ATTACH=CONFIG]14573[/ATTACH]

Edited July 9, 2012 by SWICT
higher res

[SWICT]

And another

 

[morganw]

What if you try a physical client instead of VMWare?

I've never seen it do that before...

[SWICT]

Same error, tried a couple of different nic cards too just too make sure

 

Me neither

[morganw]

I think it would do this if the pxelinux configuration file is missing all of the boot menu options. You could try re-writing this by modifying something in the user interface (like the menu timeout) and then save the changes. This should be somewhere like /tftpboot/pxelinux.cfg/default I don't run it anymore so I can't check anywhere. If the options are all in here but not getting to the client then it could be a file system permissions issue that stops the config file being sent to the client. As you have VMWare it might be worth just setting up a second Fog server from scratch and point to that to TFTP boot, just to see what happens with the boot menu.

[SWICT]

Yeah Ive got a second VM building as we speak, dont want to spend hours on something when it might be quicker to just rebuild from scratch

 

Ill take a look at the PXE menu tho, thanks for the suggestions....just strange how everything was working fine and now its broken!

[3s-gtech]

Damn, wish I could remember the other settings location. It may be /opt/fog/.fogsettings

 

I believe the reason it won't work is it's now looking at two locations for DHCP, across two files. It's not unified, and it is quite annoying!

[SWICT]

Thanks Ill take a look whilst the other vm installs fog, would make sense I guess with regards to the two locations for dhcp!

[SWICT]

Ok so doing a clean install works fine, I think Ill look at transferring everything across from the old box to the new box, thanks for all your input guys much appreciated