Revision as of 12:36, 23 November 2010

Virtualization short cuts for noobs

Introduction

Purpose

Scope

Acronyms, descriptions

References

http://www.linux-kvm.org/page/Documents: KVM documentation page.
http://www.linuxfoundation.org/collaborate/workgroups/networking/bridge: description of the linux bridge implementation.
http://en.gentoo-wiki.com/wiki/Bridging_Network_Interfaces
http://en.gentoo-wiki.com/wiki/KVM#Networking_2: Shows direct and indirect bridging.
http://blog.loftninjas.org/2008/08/18/using-attach-interface-with-libvirt-and-qemukvm-on-ubuntu/: about attach-interface.
http://tjworld.net/wiki/Linux/Ubuntu/VirtualMachinesWithVDENetworking: Virtual Machines With VDE Networking
http://www.mythicalbeast.co.uk/linux/dnsmasq_howto.html: HOWTO for dnsmasq
http://www.tuxradar.com/content/howto-linux-and-windows-virtualization-kvm-and-qemu: hands-on KVM usage and a bit of background information.
http://www.ibm.com/developerworks/library/l-linuxvirt/index.html: An overview of virtualization methods, architectures, and implementations. From 2006.
Virtualization_Quick_Start: Get going with KVM.

Open issues

how to pin Dom0: How do we pin Dom0 to a specific CPU?

Operating Environment

Which packages you need in order to run virtualization.

Storage

File based
LVM Based
NFS based
iSCSI

Network

Network configuration needs.

Bridging
- Direct
- NAT
NAT/Route

Get direct bridging

Looks better: [Guest Configuration on Fedora 12 with Netcf] Source: [KVM w/o dnsmasq on CentOS 5.2 X64].

cd /etc/sysconfig/network-scripts
mkdir bak
cp -p ifcfg-eth0 bak
virsh iface-dumpxml eth0 > bak/eth0.xml
cp bak/eth0.xml bak/kvmbr0.xml
vi bak/kvmbr0.xml
virsh iface-define bak/kvmbr0.xml
virsh iface-list
service network restart
virsh edit fc13_1
brctl show

The following didn't cut it, it simply prevented the DomU in starting, due to the missing 'default' network...

virsh net-destroy default
virsh net-autostart --disable default

virsh net-autostart default

virsh net-dumpxml default

<network>
  <name>default</name>
  <uuid>4eb269bb-b949-49ae-95b1-6e281b634c47</uuid>
  <forward mode='route'/>
  <bridge name='virbr0' stp='on' delay='0' />
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254' />
    </dhcp>
  </ip>
</network>

Resource allocation

KVM

Xen

Administration

virsch

virsh help lists the supported commands.

Virsh operations commands of interest

console: get access to the console in the DomU.
destroy: as if you pulled the power cord, preferably use 'shutdown'.
reboot: reboot the domain.
shutdown: shutdown the domain.
undefine: remove all references to the domain. (Note; not sure if it is actually *all*).

dumpxml
list: List the active domains. Use '--all' to include the the inactive containers to the list.

Virsh network commands of interest

domifstat: interface statistics.

virsh domifstat z3 vif7.0

attach-interface: attach a network interface.

virsh attach-interface z3 bridge eth1 --target eth1 --mac xx:xx:xx:xx:xx:xx

net-edit: For an description of the xml structure see: [XML format]
net-list: list networks.

virsh cpu commands of interest

vcpuping <domain-id> <vcpuid> <cpulist>: Pin a domains virtual cpu to a list of cpu's.

- virsh vcpupin z2 0 2

virsh vcpuinfo z2

VCPU: 0 CPU: 2 State: idle CPU time: 9.8s CPU Affinity: --y-----

virt-install

virt-mananger

remote management

Creating DomUs

Creating a CentOS 5.5 DomU

source:NFS, storage:LVM network:bridge;4

virt-install -p --name=z4 --ram=512 --vcpus=1 --disk path=/dev/loom/z4 --os-type=linux --os-variant=rhel5 --location=nfs:192.168.42.132:/exports/isos/centos55 -x "ks=nfs:192.168.42.132:/exports/ks/anaconda-ks.cfg ip=192.168.42.31 netmask=255.255.255.0 gateway=192.168.42.132 dns=192.168.42.32"

@@ Line 22: / Line 22: @@
 ; http://www.tuxradar.com/content/howto-linux-and-windows-virtualization-kvm-and-qemu: hands-on KVM usage and a bit of background information.
 ; http://www.ibm.com/developerworks/library/l-linuxvirt/index.html: An overview of virtualization methods, architectures, and implementations. From 2006.
+; Virtualization_Quick_Start: Get going with KVM.
 === Open issues ===

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