https://access.redhat.com/kb/docs/DOC-6039
Sorry, misunderstood, the article above has Xen as an example. Once setup and rebooted, examine /var/log/message to see if kdump/kexec is loaded or check via service command. The article has the examples on how to test crash the kernel. i.e. Warning: This will panic your kernel, killing all services on the machine # echo 1 > /proc/sys/kernel/sysrq # echo "c" > /proc/sysrq-trigger If you follow the procedure entirely and it still does not work, when you start the kdump service, it will generate a new initrd file with kdump module/support. Do “ls –ltr /boot/” the last file should be an initrd with kdump in the filename. Modify your /etc/grub.conf and change initrd loaded in from original to the one you see in /boot/ with kdump included as a file name. Ideally I’d say create a new grub entry altogether, just in case something does not work and you can revert to working grub entry. Regards ilya From: Srija [mailto:swap_proj...@yahoo.com] Sent: Wednesday, February 08, 2012 1:41 PM To: Musayev, Ilya; Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: Re: [rhelv5-list] kdump issue with rhel5 xen Sorry being late.. The url is for getting the kernel dump of the guests under xen host. If you check my question , I was asking the kdump for the xen host , not the xen guest. Thanks again From: "Musayev, Ilya" <imusa...@webmd.net<mailto:imusa...@webmd.net>> To: Srija <swap_proj...@yahoo.com<mailto:swap_proj...@yahoo.com>>; Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list <rhelv5-list@redhat.com<mailto:rhelv5-list@redhat.com>> Sent: Monday, February 6, 2012 5:40 PM Subject: RE: [rhelv5-list] kdump issue with rhel5 xen I guess disregard my suggestion as it applies to plain (non Xen) based setup. For Xen, read this doc: https://access.redhat.com/kb/docs/DOC-9864 ________________________________________ From: Srija [swap_proj...@yahoo.com<mailto:swap_proj...@yahoo.com>] Sent: Monday, February 06, 2012 5:25 PM To: Musayev, Ilya; Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: Re: [rhelv5-list] kdump issue with rhel5 xen Thanks for your reply. >Are you able to force a fake kdump? I could not able to create any kdump. Are you asking to do manually ? >Also, in past I had to use the initrd file created by kdump when you start the >services. Sorry I am not clear here. Would you pl. write here how to start the services.. with the initrd file >Needless to say, try limiting the amount of RAM that system boots with How much you are suggesting to set the limit? Thanks so much again.... From: "Musayev, Ilya" <imusa...@webmd.net<mailto:imusa...@webmd.net>> To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list <rhelv5-list@redhat.com<mailto:rhelv5-list@redhat.com>>; Srija <swap_proj...@yahoo.com<mailto:swap_proj...@yahoo.com>> Sent: Monday, February 6, 2012 1:54 PM Subject: RE: [rhelv5-list] kdump issue with rhel5 xen Needless to say, try limiting the amount of RAM that system boots with – much easier to upload and debug. As per previous thread I had on this list you can use “mem” kernel boot parameter. From: rhelv5-list-boun...@redhat.com<mailto:rhelv5-list-boun...@redhat.com> [mailto:rhelv5-list-boun...@redhat.com<mailto:rhelv5-list-boun...@redhat.com>] On Behalf Of Musayev, Ilya Sent: Monday, February 06, 2012 12:38 PM To: Srija; Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: Re: [rhelv5-list] kdump issue with rhel5 xen Are you able to force a fake kdump? Also, in past I had to use the initrd file created by kdump when you start the services. For some reason I don’t see that stepped mentioned anywhere in the DOCs.. Try that as well. Let me know what happens, Good luck -ilya From: rhelv5-list-boun...@redhat.com<mailto:rhelv5-list-boun...@redhat.com><mailto:rhelv5-list-boun...@redhat.com<mailto:rhelv5-list-boun...@redhat.com>> [mailto:rhelv5-list-boun...@redhat.com<mailto:rhelv5-list-boun...@redhat.com>]<mailto:[mailto:rhelv5-list-boun...@redhat.com<mailto:rhelv5-list-boun...@redhat.com>]> On Behalf Of Srija Sent: Friday, February 03, 2012 6:54 PM To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list Subject: [rhelv5-list] kdump issue with rhel5 xen Hi, I am facing issues to get kdump in the xen environment. The server has: kernel : 2.6.18-274.el5xen #1 SMP Fri Jul 8 17:45:44 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux memory : 2gb, cpu : 8 x 2 Installed the rpm as follows: kernel-2.6.18-274.el5 kernel-xen-2.6.18-274.el5 kernel-xen-devel-2.6.18-274.el5 kernel-doc-2.6.18-274.12.1.el5 kernel-debuginfo-common-2.6.18-274.17.1.el5 kernel-debug-2.6.18-274.17.1.el5 kexec-tools-1.102pre-126.el5_6.6 system-config-kdump-1.0.14-4.el5 crash-4.1.2-8.el5 The /etc/grub.conf as follows: serial -unit=0 -speed=115200 terminal -timeout=10 serial console default=3 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title Red Hat Enterprise Linux Server (2.6.18-274.17.1.el5debug) root (hd0,0) kernel /vmlinuz-2.6.18-274.17.1.el5debug ro root=/dev/vgroot_xen/lvroot console=tty0, 115200 initrd /initrd-2.6.18-274.17.1.el5debug.img title Red Hat Enterprise Linux Server (2.6.18-274.el5) root (hd0,0) kernel /vmlinuz-2.6.18-274.el5 ro root=/dev/vgroot_xen/lvroot console=tty0, 115200 initrd /initrd-2.6.18-274.el5.img title Red Hat Enterprise Linux Server (2.6.18-274.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-274.el5 dom0_mem=2048MB xenheap_megabytes=64 crashkernel=128M@16M<mailto:crashkernel=128M@16M> module /vmlinuz-2.6.18-274.el5xen ro root=/dev/vgroot_xen/lvroot console=tty0, 115200 module /initrd-2.6.18-274.el5xen.img The /etc/kdump.conf file as follows: path /var/kdump core_collector makedumpfile -d 31 -c Crashing the kernel as mentioned in the document: echo "1" > /proc/sys/kernel/sysrq echo "c" > /proc/sysrq-trigger kdump has been started But server is not generating any crash dump file. Neither getting any log messages regarding the crash dump. Any advice is really appreciated. Thanks again
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