Difference between revisions of "RHEL5 Kernel HOWTO"
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This HOWTO will show you how to get a RHEL5-based OpenVZ kernel running on a Funtoo Linux system. | This HOWTO will show you how to get a RHEL5-based OpenVZ kernel running on a Funtoo Linux system. | ||
== Step 1: Downgrade udev, lvm2 == | == Step 1: Downgrade {{Package|sys-fs/udev}}, {{Package|sys-fs/lvm2}} == | ||
Downgrade udev to a version compatible with kernels previous than 2.6.27: | Downgrade udev to a version compatible with kernels previous than 2.6.27: | ||
<console> | |||
< | ###i## echo ">=sys-fs/udev-147" >> /etc/portage/package.mask | ||
echo ">=sys-fs/udev-147" >> /etc/portage/package.mask | ###i## emerge -u udev | ||
emerge -u udev | </console> | ||
</ | |||
This will also require a downgrade of lvm2, if you are using it. Version 2.02.68 is a good one to use: | This will also require a downgrade of lvm2, if you are using it. Version 2.02.68 is a good one to use: | ||
<console> | |||
###i## echo ">=sys-fs/lvm2-2.02.69" >> /etc/portage/package.mask | |||
###i## emerge -u lvm2 | |||
</console> | |||
Downgrade make to a version compatible with older kernel version: | |||
<console> | |||
###i## echo ">=sys-devel/make-3.82" > /etc/portage/package.mask | |||
###i## emerge -u make | |||
</console> | |||
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 == | == 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: | The process for installing an RHEL5-based kernel with OpenVZ support has been drastically simplified. Simply perform the following steps: | ||
<console> | |||
###i## echo "sys-kernel/openvz-rhel5-stable binary" >> /etc/portage/package.use | |||
</console> | |||
< | This will result in the kernel sources and a binary kernel and initrd being merged. Without <code>binary</code> in USE, only the sources will be merged. Then: | ||
# | <console> | ||
</ | ###i## emerge openvz-rhel5-stable | ||
</console> | |||
This will | 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 <code>/etc/boot.conf</code> to find and boot the new kernel. | ||
Note: you may need to temporarily modify your <code>CFLAGS</code> settings to ensure they are compatible with gcc-4.1 systems. In particular, <code>-march=native</code> is not recognized by the older gcc. | |||
Note: you may need to temporarily modify your < | |||
[1] http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options | [1] http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options | ||
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== Step 3: Enable vz initscript == | == Step 3: Enable vz initscript == | ||
When your system boots with OpenVZ support enabled, it will require /etc/init.d/vz to run: | When your system boots with OpenVZ support enabled, it will require <code>/etc/init.d/vz</code> to run: | ||
<console> | |||
< | ###i## rc-update add vz default | ||
# rc-update add vz default | </console> | ||
</ | |||
== Step 4: Edit boot.conf == | == Step 4: Edit boot.conf == | ||
Update /etc/boot.conf to point to your new kernel, ie: | Update <code>/etc/boot.conf</code> to point to your new kernel, ie: | ||
{{File | |||
<pre> | |/etc/boot.conf|<pre> | ||
boot { | boot { | ||
generate grub | generate grub | ||
| Line 70: | Line 64: | ||
params += real_root=auto | params += real_root=auto | ||
} | } | ||
</pre> | </pre>}} | ||
Note that you must use the | |||
Note that you must use the < | <console> | ||
configure your boot loader to specify your root | params += real_root=auto | ||
initrd. | </console> option. This will automatically configure your boot loader to specify your root file system as the | ||
<console> | |||
real_root | |||
</console> | |||
to the initrd. | |||
== Step 5: boot-update == | == Step 5: boot-update == | ||
Now, simply run < | Now, simply run <code>boot-update</code> as root: | ||
<console> | |||
< | ###i## boot-update | ||
boot-update | </console> | ||
</ | |||
<tt>boot-update</tt> should show the new kernel as being found and display it as the default | <tt>boot-update</tt> should show the new kernel as being found and display it as the default | ||
Revision as of 03:55, January 15, 2014
Introduction
This HOWTO will show you how to get a RHEL5-based OpenVZ kernel running on a Funtoo Linux system.
Step 1: Downgrade No results, No results
Downgrade udev to a version compatible with kernels previous than 2.6.27:
root # echo ">=sys-fs/udev-147" >> /etc/portage/package.mask root # 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:
root # echo ">=sys-fs/lvm2-2.02.69" >> /etc/portage/package.mask root # emerge -u lvm2
Downgrade make to a version compatible with older kernel version:
root # echo ">=sys-devel/make-3.82" > /etc/portage/package.mask root # 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:
root # 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:
root # 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:
root # rc-update add vz default
Step 4: Edit boot.conf
Update /etc/boot.conf to point to your new kernel, ie:
{{{body}}}
Note that you must use the
params += real_root=auto
option. This will automatically configure your boot loader to specify your root file system as the
real_root
to the initrd.
Step 5: boot-update
Now, simply run boot-update as root:
root # boot-update
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.