How To Install Xen Hypervizor On CentOs 7.

1. Install CentOs 7 on your vm/vps/server.

2. Partition the Xen hypervisor box:

   The disk can be partitioned any way you like, with one exception: you must create a separate partition with LVM. This will be used to deploy block devices as hard disks for virtual machines.

3. Install essential utilities on the Xen Hypervisor box:

We recommend the following software is preinstalled on the Xen hypervisor box: 

• vim command-line editor. This guide uses vim in examples where files need to be edited.

• GNU tar utility and GNU zip archive tool. They are used to pack the template.

• X window system. We will use it to run some GUI applications.

• Apache web server. It will be used to run local distributive mirrors, and access KickStart files during installation.

• virt-manager. Not mandatory, but sometimes it makes creating servers easier.

• vncviewer. Used for connecting to virtual servers via VNC.

• LVM utilities. All of them will be required while creating servers and Linux templates for OnApp.

1. Add YUM repository:

   An extra YUM repository is used to get the Xen hypervisor installed manually.

   Please download extra repository configuration file and place it into standard YUM repositories configuration files location (/etc/yum.repos.d/):

   # wget http://www.gitco.de/repo/GITCO-XEN3.4.3_x86_64.repo -O /etc/yum.repos.d/ GITCO-XEN3.4.3_x86_64.repo 

2. Install Xen Hypervisor:

1. Clean YUM meta-data:

   # yum -y -q clean all 

2. Remove old Xen if installed:

   # yum remove xen 

3. Install the latest Xen from GITCO:

   # yum install xen 

4. Remove i386 libvirt:

   # yum remove libvirt.i386 xen-libs.i386 

5. Configure xend service to start on system boot:

   # chkconfig --add xend
   # chkconfig xend on 

6. Install Xen hypervisor (Dom0) kernel:

   # yum install kernel-xen 

7. Verify the kernel-xen package is installed, and determine the version:

   # rpm -q kernel-xen 

8. Configure GRUB boot loader to use Xen kernel as default (check GRUB’s configuration file):

   # vim /boot/grub/grub.conf

9. Reboot the box:

   # shutdown -r now 

10. Check if Xen hypervisor is running when the box boots:

    # xm info