How to Upgrade XEN to 4.1.4 on CentOS?

[DewlanceCTO]

Hello,

First you need to check your Xen Version by typing a command in your SSH Client

xm info
xl info

You will get a 10 to 20 line output result but you need to check only this 3 lines..
xen_major : 4
xen_minor : 1
xen_extra : .1

It means your Xen version is 4.1.1

If both commands are not working then you can check your Xen version from /etc/grub.conf file..

Command:

nano /etc/grub.conf

output result

default=0 << If set to 3 then check 3rd title
timeout=10
splashimage=
hiddenmenu
title CentOS (3.2.12-434.3.2.el5xen)
root (hd0,0)
kernel /xen.gz-4.2.1 <<< YOUR XEN VERSION
module /vmlinuz-4.2.1.el5xen ro
module /initrd-4.2.1.el5xen.img << << Your Xen Version
title CentOS (xyz)

How to Upgrade Xen? (If you don't want to change your whole version from 3.x to 4.x.
Upgrade Kernel:

yum upgrade kernel-xen*

How to Upgrade Xen Version from 3.x to 4.1.4? (Warning: Do this at your own risk)

Run this command

cd /etc/yum.repos.d

Now download latest version of Xen repo from Gitco: (If you want to install your selected repo then go to <removed> and replace with your repo url in wget command

Command:

wget removed

Now we need to remove Xen:

yum remove xen

yum remove kernel-xen*

Once you remove Xen and Xen kernel then you can install latest Xen by running this command:

yum install xen

Edit /boot/grub/grub.conf and change "default 0" to your new xen kernel line..(Eg: If your newly installed kernel title listed on 1st line then change to "default 0", If listed on 2nd then change to "default 1")

For example: (Only for example, don't replace your grub config with this config otherwise your server will stop working)

nano /etc/grub.conf

PHP Code:

default=1
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (OpenVZ)
        root 
        kernel /vmlinuz-example
        initrd /initrd-example.el5.img
title CentOS (Xen)
        root (hd0,0)
        kernel /xen.gz-4.1.4
        module /vmlinuz-4.1.4.el5xen ro root=LABE
        module /initrd-4.1.4.el5xen.img 


Now reboot your vps/server

reboot

After rebooting VPS/Server you can verify your Xen Version by running a xm info command or xl info.