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This article describes a way to upgrade your old OpenVZ system with RHEL5-based
(028stabNNN kernel) to RHEL6-based (042stabNNN) kernel, and convert /vz
from ext3 to ext4.
Assumptions:
* systems is CentOS (RHEL) 5.x
* vzkernel is 028stabXXX, i.e. RHEL5-based
* /vz uses ext3
End result should be:
* Same CentOS 5 system
* vzkernel is 042stabXXX
* /vz uses ext4
== Update your system ==
yum update
== Add rhel6 kernel repos ==
Disable rhel5 and enable rhel6 OpenVZ kernel repository.
In other words, change <code>/etc/yum.repos.d/openvz.repo</code>
to look like this (changes required are '''in bold'''):
[openvz-kernel-rhel6]
name=OpenVZ RHEL6-based stable kernels
<nowiki>#baseurl=http://download.openvz.org/kernel/branches/rhel6-2.6.32/current/</nowiki>
<nowiki>mirrorlist=http://download.openvz.org/kernel/mirrors-rhel6-2.6.32</nowiki>
'''enabled=1'''
gpgcheck=1
<nowiki>gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ</nowiki>
'''#exclude=vzkernel-firmware'''
[openvz-kernel-rhel5]
name=OpenVZ RHEL5-based kernel
<nowiki>#baseurl=http://download.openvz.org/kernel/branches/rhel5-2.6.18/current/</nowiki>
<nowiki>mirrorlist=http://download.openvz.org/kernel/mirrors-rhel5-2.6.18</nowiki>
'''enabled=0'''
gpgcheck=1
<nowiki>gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ</nowiki>
== Install new OpenVZ kernel ==
# yum install vzkernel.x86_64
== Check bootloader configuration ==
Make sure 042stab kernel is there and will boot by default:
cat /boot/grub/grub.conf
timeout 5
default 0
title OpenVZ (2.6.32-042stab081.8)
root (hd0,1)
kernel /vmlinuz-2.6.32-042stab081.8 ro root=/dev/sda3 vga=0x317 selinux=0 sysfs.deprecated=1
initrd /initrd-2.6.32-042stab081.8.img
title OpenVZ (2.6.18-348.16.1.el5.028stab108.1)
root (hd0,1)
kernel /vmlinuz-2.6.18-348.16.1.el5.028stab108.1 ro root=/dev/sda3 vga=0x317 selinux=0
initrd /initrd-2.6.18-348.16.1.el5.028stab108.1.img
....
== Reboot into new kernel ==
# reboot
and make sure the system is up and running.
== Convert /vz to ext4 ==
Boot node from a live-CD (such as, CentOS 6 live CD) and perform the following steps.
Check file system:
# fsck.ext3 -f /dev/sd''xY''
Turn on ext4 features:
# tune2fs -O extents,uninit_bg,dir_index /dev/sd''xY''
Check the new file system again, as ext4 this time:
# fsck.ext4 -fD /dev/sd''xY''
You can do the same for root filesystem, too.
Now, mount your ROOT (<code>/</code>, not <code>/vz</code>) and BOOT partitions:
# mkdir /tmp/root
# mount /dev/sd''aB'' /tmp/root
# mount /dev/sd''aC'' /tmp/root/boot
Finally, chroot into it:
# chroot /tmp/root
Edit its <code>/etc/fstab</code>, replacing <code>ext3</code> with <code>ext4</code> for <code>/vz</code> (and <code>/</code> if you converted it as well).
# vi /etc/fstab
== Create new initrd with proper modules ==
This assumes you are still entered chroot:
# mkinitrd -v -f --with=ext4 --builtin=ehci-hcd --builtin=ohci-hcd --builtin=uhci-hcd \
/boot/initrd-2.6.32-042stab81.8.img 2.6.32-042stab081.8
Notes:
* you have to add ext4 explicitly
* in RHEL6 kernels some USB stuff (that used to be in ehci-hcd, ohci-hcd, uhci-hcd modules) is built-in
== Reboot and enjoy ==
End result is:
# cat /etc/issue
CentOS release 5.10 (Final)
Kernel \r on an \m
# uname -a
Linux CentOS-58-64-minimal 2.6.32-042stab081.8 #1 SMP Mon Sep 30 16:52:24 MSK 2013 x86_64 x86_64 x86_64 GNU/Linux
# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 ext4 259G 1.5G 244G 1% /
tmpfs tmpfs 16G 0 16G 0% /dev/shm
/dev/sda2 ext3 496M 46M 425M 10% /boot
/dev/sdb1 ext4 1.8T 196M 1.7T 1% /vz
== See also ==
* [[Quick installation]]
== Acknowledgements ==
This article was originally written by [[Denis Hohryakov]].
[[Category: HOWTO]]
(028stabNNN kernel) to RHEL6-based (042stabNNN) kernel, and convert /vz
from ext3 to ext4.
Assumptions:
* systems is CentOS (RHEL) 5.x
* vzkernel is 028stabXXX, i.e. RHEL5-based
* /vz uses ext3
End result should be:
* Same CentOS 5 system
* vzkernel is 042stabXXX
* /vz uses ext4
== Update your system ==
yum update
== Add rhel6 kernel repos ==
Disable rhel5 and enable rhel6 OpenVZ kernel repository.
In other words, change <code>/etc/yum.repos.d/openvz.repo</code>
to look like this (changes required are '''in bold'''):
[openvz-kernel-rhel6]
name=OpenVZ RHEL6-based stable kernels
<nowiki>#baseurl=http://download.openvz.org/kernel/branches/rhel6-2.6.32/current/</nowiki>
<nowiki>mirrorlist=http://download.openvz.org/kernel/mirrors-rhel6-2.6.32</nowiki>
'''enabled=1'''
gpgcheck=1
<nowiki>gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ</nowiki>
'''#exclude=vzkernel-firmware'''
[openvz-kernel-rhel5]
name=OpenVZ RHEL5-based kernel
<nowiki>#baseurl=http://download.openvz.org/kernel/branches/rhel5-2.6.18/current/</nowiki>
<nowiki>mirrorlist=http://download.openvz.org/kernel/mirrors-rhel5-2.6.18</nowiki>
'''enabled=0'''
gpgcheck=1
<nowiki>gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ</nowiki>
== Install new OpenVZ kernel ==
# yum install vzkernel.x86_64
== Check bootloader configuration ==
Make sure 042stab kernel is there and will boot by default:
cat /boot/grub/grub.conf
timeout 5
default 0
title OpenVZ (2.6.32-042stab081.8)
root (hd0,1)
kernel /vmlinuz-2.6.32-042stab081.8 ro root=/dev/sda3 vga=0x317 selinux=0 sysfs.deprecated=1
initrd /initrd-2.6.32-042stab081.8.img
title OpenVZ (2.6.18-348.16.1.el5.028stab108.1)
root (hd0,1)
kernel /vmlinuz-2.6.18-348.16.1.el5.028stab108.1 ro root=/dev/sda3 vga=0x317 selinux=0
initrd /initrd-2.6.18-348.16.1.el5.028stab108.1.img
....
== Reboot into new kernel ==
# reboot
and make sure the system is up and running.
== Convert /vz to ext4 ==
Boot node from a live-CD (such as, CentOS 6 live CD) and perform the following steps.
Check file system:
# fsck.ext3 -f /dev/sd''xY''
Turn on ext4 features:
# tune2fs -O extents,uninit_bg,dir_index /dev/sd''xY''
Check the new file system again, as ext4 this time:
# fsck.ext4 -fD /dev/sd''xY''
You can do the same for root filesystem, too.
Now, mount your ROOT (<code>/</code>, not <code>/vz</code>) and BOOT partitions:
# mkdir /tmp/root
# mount /dev/sd''aB'' /tmp/root
# mount /dev/sd''aC'' /tmp/root/boot
Finally, chroot into it:
# chroot /tmp/root
Edit its <code>/etc/fstab</code>, replacing <code>ext3</code> with <code>ext4</code> for <code>/vz</code> (and <code>/</code> if you converted it as well).
# vi /etc/fstab
== Create new initrd with proper modules ==
This assumes you are still entered chroot:
# mkinitrd -v -f --with=ext4 --builtin=ehci-hcd --builtin=ohci-hcd --builtin=uhci-hcd \
/boot/initrd-2.6.32-042stab81.8.img 2.6.32-042stab081.8
Notes:
* you have to add ext4 explicitly
* in RHEL6 kernels some USB stuff (that used to be in ehci-hcd, ohci-hcd, uhci-hcd modules) is built-in
== Reboot and enjoy ==
End result is:
# cat /etc/issue
CentOS release 5.10 (Final)
Kernel \r on an \m
# uname -a
Linux CentOS-58-64-minimal 2.6.32-042stab081.8 #1 SMP Mon Sep 30 16:52:24 MSK 2013 x86_64 x86_64 x86_64 GNU/Linux
# df -Th
Filesystem Type Size Used Avail Use% Mounted on
/dev/sda3 ext4 259G 1.5G 244G 1% /
tmpfs tmpfs 16G 0 16G 0% /dev/shm
/dev/sda2 ext3 496M 46M 425M 10% /boot
/dev/sdb1 ext4 1.8T 196M 1.7T 1% /vz
== See also ==
* [[Quick installation]]
== Acknowledgements ==
This article was originally written by [[Denis Hohryakov]].
[[Category: HOWTO]]
