Difference between revisions of "028 to 042 kernel upgrade"

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This article describes a way to upgrade your old OpenVZ system with RHEL5-based
 
This article describes a way to upgrade your old OpenVZ system with RHEL5-based
 
(028stabNNN kernel) to RHEL6-based (042stabNNN) kernel, and convert /vz
 
(028stabNNN kernel) to RHEL6-based (042stabNNN) kernel, and convert /vz
−
from ext3 to ext4.
+
from ext3 to ext4, while keeping RHEL/CentOS 5 as a host OS.
  
 
Assumptions:
 
Assumptions:
Line 16: Line 16:
  
 
  yum update
 
  yum update
 +
 +
Install required software:
 +
 +
yum install e4fsprogs.x86_64
  
 
== Add rhel6 kernel repos ==
 
== Add rhel6 kernel repos ==
Line 69: Line 73:
  
 
and make sure the system is up and running.
 
and make sure the system is up and running.
 +
 +
== For linux swraid (mdadm) users with bitmap enabled and low IO write speed, you might need to redo bitmap
 +
cat /proc/mdstat , if chunk size is small  , try (example for internal bitmap) :
 +
mdadm --grow --bitmap=none /dev/md2 ;
 +
mdadm --grow --bitmap=internal --bitmap-chunk=16384 /dev/md2
  
 
== Convert /vz to ext4 ==
 
== Convert /vz to ext4 ==
  
−
Boot node from a live-CD (such as, CentOS 6 live CD) and perform the following steps.
+
If your /vz is a separate file system, you need to stop all containers
 +
and umount it first:
 +
 
 +
for ve in $(vzlist -1); do vzctl stop $ve; done
 +
umount /vz
 +
 
 +
Alternatively, boot the node from a live-CD (such as CentOS 6 live CD).
  
 
Check file system:
 
Check file system:
Line 78: Line 93:
  
 
Turn on ext4 features:
 
Turn on ext4 features:
−
  # tune2fs -O extents,uninit_bg,dir_index /dev/sd''xY''
+
  # tune4fs -O extents,uninit_bg,dir_index /dev/sd''xY''
  
 
Check the new file system again, as ext4 this time:
 
Check the new file system again, as ext4 this time:
−
  # fsck.ext4 -fD /dev/sd''xY''
+
  # fsck.ext4 -fpD /dev/sd''xY''
  
−
You can do the same for root filesystem, too.
+
If you have booted from the live CD, you can do the same for root filesystem.
  
−
Now, mount your ROOT (<code>/</code>, not <code>/vz</code>) and BOOT partitions:
+
If you have booted from the live CD, do this:
 +
* mount your ROOT and BOOT partitions:
 
  # mkdir /tmp/root
 
  # mkdir /tmp/root
 
  # mount /dev/sd''aB'' /tmp/root
 
  # mount /dev/sd''aB'' /tmp/root
 
  # mount /dev/sd''aC'' /tmp/root/boot
 
  # mount /dev/sd''aC'' /tmp/root/boot
−
 
+
* chroot into it:
−
Finally, chroot into it:
 
 
  # chroot /tmp/root
 
  # 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).
+
Finally, edit <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
 
  # vi /etc/fstab
  
 
== Create new initrd with proper modules ==
 
== Create new initrd with proper modules ==
  
−
This assumes you are still entered chroot:
+
# KV=042stab083.2
−
 
+
  # mkinitrd -v -f --with=ext4 --without-usb /boot/initrd-2.6.32-${KV}.img 2.6.32-${KV}
−
  # 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:
 
Notes:
 
* you have to add ext4 explicitly
 
* 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
+
* in RHEL6 kernels USB modules are built-in
  
 
== Reboot and enjoy ==
 
== Reboot and enjoy ==
Line 124: Line 137:
 
       /dev/sda2    ext3    496M  46M  425M  10% /boot
 
       /dev/sda2    ext3    496M  46M  425M  10% /boot
 
       /dev/sdb1    ext4    1.8T  196M  1.7T  1% /vz
 
       /dev/sdb1    ext4    1.8T  196M  1.7T  1% /vz
 +
 +
== Next steps ==
 +
 +
You can now install [[ploop]] and enjoy all its benefits.
 +
 +
Also, it makes sense to convert your containers to [[VSwap]].
  
 
== See also ==
 
== See also ==
Line 131: Line 150:
 
== Acknowledgements ==
 
== Acknowledgements ==
  
−
This article was originally written by [[User:Denis Hohryakov]].
+
This article was originally written by [[User:Denis Hohryakov|Denis Hohryakov]].
  
 
[[Category: HOWTO]]
 
[[Category: HOWTO]]

Latest revision as of 13:21, 26 May 2015

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, while keeping RHEL/CentOS 5 as a host OS.

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[edit]

yum update

Install required software: 

yum install e4fsprogs.x86_64

Add rhel6 kernel repos[edit]

Disable rhel5 and enable rhel6 OpenVZ kernel repository. In other words, change /etc/yum.repos.d/openvz.repo to look like this (changes required are in bold): 

  [openvz-kernel-rhel6]
  name=OpenVZ RHEL6-based stable kernels
  #baseurl=http://download.openvz.org/kernel/branches/rhel6-2.6.32/current/
  mirrorlist=http://download.openvz.org/kernel/mirrors-rhel6-2.6.32
  enabled=1
  gpgcheck=1
  gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ
  #exclude=vzkernel-firmware

  [openvz-kernel-rhel5]
  name=OpenVZ RHEL5-based kernel
  #baseurl=http://download.openvz.org/kernel/branches/rhel5-2.6.18/current/
  mirrorlist=http://download.openvz.org/kernel/mirrors-rhel5-2.6.18
  enabled=0
  gpgcheck=1
  gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ


Install new OpenVZ kernel[edit]

# yum install vzkernel.x86_64

Check bootloader configuration[edit]

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[edit]

# reboot

and make sure the system is up and running.

== For linux swraid (mdadm) users with bitmap enabled and low IO write speed, you might need to redo bitmap cat /proc/mdstat , if chunk size is small , try (example for internal bitmap) : mdadm --grow --bitmap=none /dev/md2 ; mdadm --grow --bitmap=internal --bitmap-chunk=16384 /dev/md2

Convert /vz to ext4[edit]

If your /vz is a separate file system, you need to stop all containers and umount it first: 

for ve in $(vzlist -1); do vzctl stop $ve; done
umount /vz

Alternatively, boot the node from a live-CD (such as CentOS 6 live CD).

Check file system: 

# fsck.ext3 -f /dev/sdxY

Turn on ext4 features: 

# tune4fs -O extents,uninit_bg,dir_index /dev/sdxY

Check the new file system again, as ext4 this time: 

# fsck.ext4 -fpD /dev/sdxY

If you have booted from the live CD, you can do the same for root filesystem.

If you have booted from the live CD, do this:

  • mount your ROOT and BOOT partitions:
# mkdir /tmp/root
# mount /dev/sdaB /tmp/root
# mount /dev/sdaC /tmp/root/boot
  • chroot into it:
# chroot /tmp/root

Finally, edit /etc/fstab, replacing ext3 with ext4 for /vz (and / if you converted it as well). 

# vi /etc/fstab

Create new initrd with proper modules[edit]

# KV=042stab083.2
# mkinitrd -v -f --with=ext4 --without-usb /boot/initrd-2.6.32-${KV}.img 2.6.32-${KV}

Notes:

  • you have to add ext4 explicitly
  • in RHEL6 kernels USB modules are built-in

Reboot and enjoy[edit]

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

Next steps[edit]

You can now install ploop and enjoy all its benefits.

Also, it makes sense to convert your containers to VSwap.

See also[edit]

Acknowledgements[edit]

This article was originally written by Denis Hohryakov.

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