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soc:2009:pravin:journal:pxekniferomomatic [2009/06/04 06:52] less1 |
soc:2009:pravin:journal:pxekniferomomatic [2009/06/04 14:47] (current) less1 |
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| provide pxe images/rom/nic with gpxe script embedded. This script will connect to pxeknife server to get boot loader. | provide pxe images/rom/nic with gpxe script embedded. This script will connect to pxeknife server to get boot loader. | ||
| + | |||
| ===== Implementation ===== | ===== Implementation ===== | ||
| + | Actual working implementation is described [[PxeKnifeRomOMaticHTTP|here]] | ||
| In file rom-o-matic/build.php the image is compiled by following command | In file rom-o-matic/build.php the image is compiled by following command | ||
| Line 15: | Line 17: | ||
| I have modified it to compile with embedded image by modifying above code with | I have modified it to compile with embedded image by modifying above code with | ||
| <code> | <code> | ||
| - | make -C '$dir' EMBEDDED_IMAGE=./pxeDHCP.gpxe '$target' | + | make -C '$dir' EMBEDDED_IMAGE=./pxeDHCP.gpxe,./pxeSTATIC.gpxe '$target' |
| </code> | </code> | ||
| Line 23: | Line 25: | ||
| echo "Hi, We will be using PXEKnife from URL http://www.alien.doesntexist.org/pxeknife" | echo "Hi, We will be using PXEKnife from URL http://www.alien.doesntexist.org/pxeknife" | ||
| echo "It is assumed that you have dhcp networking" | echo "It is assumed that you have dhcp networking" | ||
| + | imgload pxeSTATIC.gpxe | ||
| + | imgstat | ||
| + | ifopen net0 | ||
| + | echo "Hit Control+C to cancel DHCP" | ||
| + | echo "You may want to do this if you want to use static-IP" | ||
| + | echo "Otherwise, it will try DHCP, and then anyway go to static-IP" | ||
| + | sleep 4 | ||
| dhcp net0 | dhcp net0 | ||
| - | set 209:string /pxeknife.cfg/default | + | set 209:string pxelinux.cfg/default |
| set 210:string http://www.alien.doesntexist.org/pxeknife/ | set 210:string http://www.alien.doesntexist.org/pxeknife/ | ||
| echo "Here we go" | echo "Here we go" | ||
| chain http://www.alien.doesntexist.org/pxeknife/pxelinux.0 | chain http://www.alien.doesntexist.org/pxeknife/pxelinux.0 | ||
| + | echo "PxeKnife booting cancelled, using local disk instead.." | ||
| </code> | </code> | ||
| + | and //./pxeSTATIC.gpxe// contains following script. | ||
| + | <code> | ||
| + | #!gpxe | ||
| + | echo "As you dont have DHCP, you need to give details about network configuration" | ||
| + | echo "Soon, you will be presented with interface to provide details about network configuration" | ||
| + | echo "Please provide, IP address, Netmask, Gateway and Router" | ||
| + | ifopen net0 | ||
| + | set net0/ip 10.0.2.15 | ||
| + | set net0/netmask 255.255.255.0 | ||
| + | set net0/gateway 10.0.2.2 | ||
| + | set net0/dns 10.0.2.3 | ||
| + | sleep 3 | ||
| + | config | ||
| + | set 209:string pxelinux.cfg/default | ||
| + | set 210:string http://www.alien.doesntexist.org/pxeknife/ | ||
| + | echo "Here we go" | ||
| + | chain http://www.alien.doesntexist.org/pxeknife/pxelinux.0 | ||
| + | echo "PxeKnife booting cancelled, using local disk instead.." | ||
| + | </code> | ||
| + | |||
| + | |||
| The code is hosted at url [[http://www.alien.doesntexist.org/pxeknife/PHP/gpxe_generation/]] | The code is hosted at url [[http://www.alien.doesntexist.org/pxeknife/PHP/gpxe_generation/]] | ||
| - | ===== Problems ===== | + | ===== Problems (solved) ===== |
| When I boot using qemu with following command | When I boot using qemu with following command | ||
| Line 52: | Line 83: | ||
| make EMBEDDED_IMAGE=./pxeDHCP.gpxe | make EMBEDDED_IMAGE=./pxeDHCP.gpxe | ||
| qemu -fda bin/gpxe.dsk | qemu -fda bin/gpxe.dsk | ||
| + | </code> | ||
| + | |||
| + | ==== Solution ==== | ||
| + | Problem was that, qemu does not support all network drivers, and you need to tell qemu which device driver to emulate. | ||
| + | Following qemu command is working for rtl8139 | ||
| + | <code> | ||
| + | qemu -fda gpxe-git-rtl8139.dsk -net nic,model=rtl8139 -net user | ||
| + | </code> | ||
| + | |||
| + | ===== For static IP ===== | ||
| + | To support static IP, the plan is to have two scripts, one with DHCP and one with Static. | ||
| + | When DHCP fails, static will pick up and continue execution. | ||
| + | |||
| + | ==== Problem (solved) ==== | ||
| + | Second script is not getting executed. | ||
| + | I had to load the second script from first script using imgload | ||
| + | <code> | ||
| + | imgload pxeSTATIC.gpxe | ||
| + | </code> | ||
| + | Other than that, | ||
| + | I had to comment out the break statement in //core/main.c// inside function //main()// | ||
| + | there is a loop which iterate over each image. but there was a break, which had to be removed. | ||
| + | <code> | ||
| + | if ( have_images() ) { | ||
| + | for_each_image ( image ) { | ||
| + | image_exec ( image ); | ||
| + | /* break; */ /* commented so that second script will be executed -- pravin */ | ||
| + | } | ||
| + | } else { | ||
| + | |||
| + | </code> | ||
| + | |||
| + | Other change is done in //image/script.c// file inside function //script_exec()// where at end, it re-registers the script. | ||
| + | The second executable does not get executed when this line is there, so, I commented it out. | ||
| + | I am not sure what exactly is the problem, but my guess is that, \\ | ||
| + | re_register puts the script on top of the list, but older mapping where second script was loaded in memory gets messed up somehow. | ||
| + | |||
| + | <code> | ||
| + | rc = 0; | ||
| + | done: | ||
| + | /* Re-register image and return */ | ||
| + | register_image ( image ); /* commented so that next one will be executed -- pravin */ | ||
| + | return rc; | ||
| + | } | ||
| + | |||
| </code> | </code> | ||
