RHEL5 Kernel HOWTO
This HOWTO will show you how to get a RHEL5-based OpenVZ kernel running on a Funtoo Linux system.
Step 1: Downgrade sys-fs/udev (package not on wiki - please add), sys-fs/lvm2 (package not on wiki - please add)
Downgrade udev to a version compatible with kernels previous than 2.6.27:
# echo ">=sys-fs/udev-147" >> /etc/portage/package.mask # emerge -u udev
This will also require a downgrade of lvm2, if you are using it. Version 2.02.68 is a good one to use:
# echo ">=sys-fs/lvm2-2.02.69" >> /etc/portage/package.mask # emerge -u lvm2
Downgrade make to a version compatible with older kernel version:
# echo ">=sys-devel/make-3.82" > /etc/portage/package.mask # emerge -u make
Step 2: Install binary kernel
The process for installing an RHEL5-based kernel with OpenVZ support has been drastically simplified. Simply perform the following steps:
# echo "sys-kernel/openvz-rhel5-stable binary" >> /etc/portage/package.use
This will result in the kernel sources and a binary kernel and initrd being merged. Without
binary in USE, only the sources will be merged. Then:
# emerge openvz-rhel5-stable
This will build and install a binary kernel image and initial RAM disk, and take care of installing all necessary dependencies like gcc-4.1.2. Once the binary kernel image and initrd is installed, configure
/etc/boot.conf to find and boot the new kernel.
Note: you may need to temporarily modify your
CFLAGS settings to ensure they are compatible with gcc-4.1 systems. In particular,
-march=native is not recognized by the older gcc.
Step 3: Enable vz initscript
When your system boots with OpenVZ support enabled, it will require
/etc/init.d/vz to run:
# rc-update add vz default
Step 4: Edit boot.conf
/etc/boot.conf to point to your new kernel, ie:
Note that you must use the
params += real_root=autooption. This will automatically configure your boot loader to specify your root file system as the
to the initrd.
Step 5: boot-update
Now, simply run
boot-update as root:
boot-update should show the new kernel as being found and display it as the default selection for the next boot. You can now reboot your system and start using OpenVZ.