Install kernel‑xen RPM package

RNs that are running Redhat 5.x depend on a kernel-xen RPM package. If you are running Redhat 6.x this package is installed by default; as such, you don’t need to perform the following procedure.

Perform this procedure if you enrolled your PNs without having previously installed the kernel-xen RPM package, or if you’re attempting to restore a Recovery PN as part of a BMR. Redhat 5.x RNs will not boot without this package.

To install the kernel-xen RPM package:

The following procedure works on kernel-xen-2.6.18, and should work for all subsequent revisions.

1.	Determine if you need the kernel-xen RPM package and, if so, which package:

a.	Verify the OS version. Again, the PN must be Redhat 5.x version.

# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5.7 (Tikanga)

b.	Determine if the PN’s OS is 32-bit or 64-bit.

# uname -a Linux RHEL57x64-18-178 2.6.18-274.el5 #1 SMP Fri Jul 8 17:36:59 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux

In this case, x86_64 means the 64-bit package is required.

2.	Download the kernel-xen package for RedHat 5.x PN (x32 or x64).

•	For 32-bit, go to http://mirror.centos.org/centos-5/5/os/i386/CentOS/, scroll down to view the complete package name for the latest kernel-xen package, then run the following command:

# wget http://mirror.centos.org/centos/5/os/i386/CentOS/kernel-xen-<latestRelease>-<latestRevision>.el5.i686.rpm

•	For 64-bit, go to http://mirror.centos.org/centos-5/5/os/x86_64/CentOS/, scroll down to view the complete package name for the latest kernel-xen package, then run the following command:

# wget http://mirror.centos.org/centos/5/os/x86_64/CentOS/kernel-xen-<latestRelease>-<latestRevision>.el5.x86_64.rpm

3.	Install the kernel-xen package.

•	For 32-bit:

# rpm -iv kernel-xen-<latestRelease>-<latestRevision>.el5.i686.rpm

•	For 64-bit:

# rpm -iv kernel-xen-<latestRelease>-<latestRevision>.el5.x86_64.rpm

4.	Make the initrd file, which will be used to build the RN.

# mkinitrd -v -f --preload=xennet --preload=xenblk --omit-scsi-modules --omit-raid-modules \ /boot/initrd-<latestRelease>-<latestRevision>.el5xen.img.5 <latestRelease>-<latestRevision>.el5xen

5.	Make the /boot/grub/grub.conf.xvf5 file, which signals the RN to use it as grub boot menu.

The /boot/grub/grub.conf.xvf and /boot/grub/grub.conf.xvf[1-4] must not be installed because they have higher priority than /boot/grub/grub.conf.xvf5.

# vi /boot/grub/grub.conf.xvf5

6.	Cut and paste the following line to the file.

# grub.conf generated by Quorum onQ # The root device path is not important and will be changed automatically during RN build. default=0 timeout=5 hiddenmenu title Red Hat Enterprise Linux Server by Quorum onQ (<latestRelease>-<latestRevision>.el5xen) root (hd0,0) kernel /vmlinuz-<latestRelease>-<latestRevision>.el5xen ro root=/dev/xvda1 rd_NO_LUKS rd_NO_MD rhgb crashkernel=auto rd_NO_LVM initrd /initrd-<latestRelease>-<latestRevision>.el5xen.img.5

If you’re performing this procedure on the RN (not the PN), back up and build the RN.

To uninstall the kernel-xen RMP package:

1.	Uninstall the kernel-xen rpm:

# rpm -e kernel-xen-<latestRelease>-<latestRevision>.el5

2.	Remove the /boot/grub/grub.conf.xvf5 file.

# \rm -f /boot/grub/grub.conf.xvf5

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