Thanks Bernard! This is what I was looking for. Jess
On 12/16/2009 07:13 PM, Bernard Li wrote:
Hi Jess: With Xen-based kernels, you should be using the xen.gz "kernel" instead of vmlinuz. Here's what a grub entry looks like for booting Xen-based kernels: title CentOS (2.6.18-164.el5xen) root (hd0,0) kernel /xen.gz-3.4.0 module /vmlinuz-2.6.18-164.el5xen ro root=/dev/VolGroup00/LogVol00 module /initrd-2.6.18-164.el5xen.img Good luck! Cheers, Bernard On Tue, Dec 15, 2009 at 2:22 PM, Jess Cannata<ja...@georgetown.edu> wrote:I'm having a problem booting Xen kernels via PXE. I want to boot a machine via PXE that will then host Xen virtual machines. The client machine PXE boots, receives the pxelinux.0 file, and then grabs the Xen kernel (vmlinuz-2.6.18-164.6.1.el5xen). However, it can never load the Xen kernel. On the client, I get the following error: Invalid or corrupt kernel image. I have tried the following three kernels (two stock Centos kernels and one custom compiled kernel) and only the Xen kernel fails: -rw-r--r-- 1 root root 2030154 Dec 10 15:28 vmlinuz-2.6.18-164.6.1.el5xen -rw-r--r-- 1 root root 1932284 Sep 25 16:17 vmlinuz-2.6.18-164.el5 -rw-r--r-- 1 root root 3277584 Dec 10 15:29 vmlinuz-2.6.27.15-jw-node The others load without error. I have checked multiple times that the Xen kernel is not corrupt via md5sums and by booting it via grub. It just seems not to like the PXE system. Here is a snippet of the dnsmasq log to show that the file is sent correctly to the client: Dec 11 04:12:57 julie dnsmasq[9117]: TFTP sent /tftpboot/pxelinux.0 to 192.168.0.6 Dec 11 04:12:57 julie dnsmasq[9117]: TFTP sent /tftpboot/pxelinux.cfg/default to 192.168.0.6 Dec 11 04:12:57 julie dnsmasq[9117]: TFTP sent /tftpboot/vmlinuz-2.6.18-164.6.1.el5xen to 192.168.0.6 I have tried three different systems for the DHCP, TFTP, and PXE Servers (using stock RHEL/Centos packages). Here are the specs: System 1 Centos 5.4 (64-bit) with nvidia Ethernet adapters dnsmasq for both DHCP and TFTP Servers syslinux for PXE System 2 Centos 5.4 (64-bit) with e1000 Ethernet adapters dnsmasq for both DHCP and TFTP Servers syslinux for PXE System 3 Centos 5.3 (32-bit) with e1000 Ethernet adapters (trying 32-bit version of the Xen kernel) Config One: dnsmasq for both DHCP and TFTP Servers syslinux for PXE Config Two: dnsmasq for DHCP Server tftp-server for TFTP Server syslinux for PXE The client machines use the same hardware as the servers. I haven't seen anything about Xen kernels having issues with PXE. Before I start trying different flavors of Linux, I'm curious if anyone else has seen or heard of this problem. Many thanks in advance. Jess _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
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