LearnAdmin: Redhat Virutulization KVM Faq's and commands

Min configuration 6GB disk space, 2GB RAM

Recommended 6GB+ Guest OS size , 2GB + Ram required for Guest OS

Check Intel® VT virtualization extensions are enabled .

xm dmesg | grep VMX

example output

(XEN) VMXON is done
(XEN) VMXON is done

VMXON in the output tells that it is on.

Check AMD-V architectures

xm dmesg | grep SVM

example output

(XEN) AMD SVM Extension is enabled for cpu 0
(XEN) AMD SVM Extension is enabled for cpu 1

Installing Redhat Virtulization with yum
----------------------------------------------------------

install "xen" and "kernel-xen" packages

# yum install xen kernel-xen
# yum install virt-manager libvirt libvirt-python libvirt-python python-virtinst

Installing guest with virt-install
---------------------------------------------

# virt-install --name fedora9 --ram 512 --file=/var/lib/xen/images/fedora9.img \
--file-size=3 --vnc --cdrom=/path=to/fedora9.iso

Giving location of ISO file

virt-install --name nare-Cmd-Ubuntu --ram 512 --file=/var/ns-ubuntu.img --file-size=8 --cdrom /home/kvm/ubuntu-9.04-desktop-i386.iso

# virt-install -n rhel5PV -r 500 -f /var/lib/xen/images/rhel5PV.dsk -s 3 --vnc -p

-l\ftp://10.1.1.1/trees/RHEL5-B2-Server-i386/

sudo virsh reboot rhel5PV

--vnc opens a GUI window installation

creating guests with virt-manager
-------------------------------------------------

$ sudo virt-manager &

Creating guest with virt-manager explained by redhat

Note : Use default location for Guest which is "/var/lib/xen/images/. "

if you choose different location make sure it is added to your SELinux policy and relabeled before you continue with the installation

Creating XML configuration for installed VM

virsh dumpxml NS-test-ubuntu> naresh.xml

Cat naresh.xml will give show the xml file

After creating xml file of a VM

virsh --connect qemu:///system

to get connected to virsh prompt and then define the Virtual machine.

virsh # define /var/lib/libvirt/images/naresh.xml

after defining the VM we can issue commands like

virsh # shutdown NS-test-ubuntuDomain NS-test-ubuntu is being shutdown

virsh # start NS-test-ubuntuDomain NS-test-ubuntu started

virsh # list
 Id Name                 State
----------------------------------
  1 storage              running
  8 NS-test-ubuntu       running

nice link for virtulization with KVM on ubuntu-9.10

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