Xen Guest (DomU) Installation
OS: RedHat Enterprise Linux 5 (RHEL5), should also work on CentOS and Fedora.
There are a few methodes to install a Xen Guest (DomU). In my experience the easiest and smoothest way for such an installation is to use the virt-install script, which is installed by default on RedHat Linux systems.
First of all, we have to install the Xen Virtualization packages (kernel-xen-devel is optional, but for example needed by HP ProLiant Supprt Pack (PSP)).
# yum install rhn-virtualization-common rhn-virtualization-host kernel-xen-devel virt-manager
On CentOS and Fedora:
# yum groupinstall Virtualization
After that a reboot for loading the Xen kernel is needed.
Guest Installation with virt-install
In the following example the Xen Guest installation is made with a kickstart config file. The kickstart file and the OS binaries are on a provisioning server (cobbler) and reachable over the http protocol.
# virt-install -x ks=http://lungo.pool/cblr/kickstarts/rhel51-x86_64_smbxen/ks.cfg Would you like a fully virtualized guest (yes or no)? This will allow you to run unmodified operating systems. no What is the name of your virtual machine? smbxen How much RAM should be allocated (in megabytes)? 1024 What would you like to use as the disk (path)? /dev/vg_xen/lv_smbxen Would you like to enable graphics support? (yes or no) yes What is the install location? http://lungo.pool/cblr/links/rhel51-x86_64/ Starting install... Retrieving Server... 651 kB 00:00 Retrieving vmlinuz... 100% |=========================| 1.8 MB 00:00 Retrieving initrd.img... 100% |=========================| 5.2 MB 00:00 Creating domain... 0 B 00:00 VNC Viewer Free Edition 4.1.2 for X - built Jan 15 2007 10:33:11
At this point a regular RedHat OS installation (graphical installer) starts.
To automatically run the guest after a system (Dom0) reboot, we have to create the following link:
# ln -s /etc/xen/[guest_name] /etc/xen/auto/
We can manage the Xen Guest with xm commands, virsh commands or virt-manager.
List Domains (Xen Guests)
# xm list
Start a Guest
# xm create [guest-config]
Connect to a guest console ( Back: ESC-] (US-keyboard), Ctrl-5 (German keyboard))
# xm console [guest_name]
Shutdown a guest
# xm shutdown [guest_name]
Destroy (Power off) a guest
# xm destroy [guest_name]
# xm top
# virsh virsh # help Commands: autostart autostart a domain capabilities capabilities connect (re)connect to hypervisor console connect to the guest console create create a domain from an XML file start start a (previously defined) inactive domain destroy destroy a domain define define (but don't start) a domain from an XML file domid convert a domain name or UUID to domain id domuuid convert a domain name or id to domain UUID dominfo domain information domname convert a domain id or UUID to domain name domstate domain state dumpxml domain information in XML help print help list list domains net-autostart autostart a network net-create create a network from an XML file net-define define (but don't start) a network from an XML file net-destroy destroy a network net-dumpxml network information in XML net-list list networks net-name convert a network UUID to network name net-start start a (previously defined) inactive network net-undefine undefine an inactive network net-uuid convert a network name to network UUID nodeinfo node information quit quit this interactive terminal reboot reboot a domain restore restore a domain from a saved state in a file resume resume a domain save save a domain state to a file schedinfo show/set scheduler parameters dump dump the core of a domain to a file for analysis shutdown gracefully shutdown a domain setmem change memory allocation setmaxmem change maximum memory limit setvcpus change number of virtual CPUs suspend suspend a domain undefine undefine an inactive domain vcpuinfo domain vcpu information vcpupin control domain vcpu affinity version show version vncdisplay vnc display attach-device attach device from an XML file detach-device detach device from an XML file attach-interface attach network interface detach-interface detach network interface attach-disk attach disk device detach-disk detach disk device
Exp.: Start a guest with virsh
# virsh start [guest_name]
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