centos _ redhat_ install kvm virtualization software.pdf
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CentOS / Redhat: Install KVM Virtualization Software
byNix Crafton June 12, 2010 35 comments LAST UPDATED February 1, 2011
inCentOS, Linux KVM
, RedHat and Friends
KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions Intel VT or AMD-V. How do I install KVM
under CentOS or Red Hat Enterprise Linux version 5.5?
The Linux kernel 2.6.20 and above included KVM. RHEL 5.5 (and upcoming RHEL 6) supports KVM out of box and it has also been ported to FreeBSD as a loadable
kernel module. However, this tutorial is tested on both CentOS and RHEL 5.5 only running 64 bit Intel Xeon CPU (with Intel VT) and 64 bit kernels with SELinux running in
enforcing mode.
Why KVM?
XEN allows several guest operating systems to execute on the same computer hardware and it is also included with RHEL 5.5. But, why use KVM
over XEN? KVM is part of the official Linux kernel and fully supported by both Novell and Redhat. Xen boots from GRUB and loads a modified host operating system such as
RHEL into the dom0 (host domain). KVM do not have concept of dom0 and domU. It uses /dev/kvm interface to setup the guest operating systems and provides required
drivers. See the official wikifor more information.
Required Packages
You must install the following packages:
1. kmod-kvm: kvm kernel module(s)
2. kvm: Kernel-based Virtual Machine
3. kvm-qemu-img: Qemu disk image utility
4. kvm-tools: KVM debugging and diagnostics tools
5. python-virtinst: Python modules and utilities for installing virtual machines
6. virt-manager: Virtual Machine Manager (GUI app, to install and configure VMs)
7. virt-viewer: Virtual Machine Viewer (another lightweight app to view VM console and/or install VMs)
8. bridge-utils: Utilities for configuring the Linux Ethernet bridge (this is recommended for KVM networking)
KVM Package Group
RHEL comes with KVM software group which includes full virtualization support with KVM. You can list all packages in the group as follows:
# yum groupinfo KVM
Sample outputs:
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Loaded plugins: rhnplugin, security
Setting up Group Process
Group: KVM
Description: Virtualization Support with KVM
Mandatory Packages:
celt051
etherboot-zroms
etherboot-zroms-kvm
kmod-kvm
kvm
kvm-qemu-img
qcairo
qffmpeg-libs
qpixman
qspice-libsDefault Packages:
Virtualization-en-US
libvirt
virt-manager
virt-viewer
Optional Packages:
celt051-devel
etherboot-pxes
etherboot-roms
etherboot-roms-kvm
gpxe-roms-qemu
iasl
kvm-tools
libcmpiutil
libvirt-cim
qcairo-devel
qffmpeg-devel
qpixman-devel
qspice qspice-libs-devel
A Note About libvirt
libvirt is an open source API and management tool for managing platform virtualization. It is used to manage Linux KVM and Xen virtual machines through graphical interfaces
such as Virtual Machine Manager and higher level tools such as oVirt. See the official websitefor more information.
A Note About QEMU
QEMU is a processor emulator that relies on dynamic binary translation to achieve a reasonable speed while being easy to port on new host CPU architectures. When used as a
virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen
hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests. See the official website
for more information.
A Note About Virtio Drivers
Virtio is paravirtualized drivers for kvm/Linux. With this you can can run multiple virtual machines running unmodified Linux or Windows VMs. Each virtual machine has private
virtualized hardware a network card, disk, graphics adapter, etc. According to Redhat:
Para-virtualized drivers enhance the performance of fully virtualized guests. With the para-virtualized drivers guest I/O latency decreases and throughput increases
to near bare-metal levels. It is recommended to use the para-virtualized drivers for fully virtualized guests running I/O heavy tasks and applications.
Host Operating System
Your main operating system such as CentOS or RHEL is known as host operating system. KVM is a Linux kernel module that enables a modified QEMU program to use
hardware virtualization. You only need to install KVM under host operating systems.
KVM Domains
It is nothing but a guest operating system running under host operating system. Each kvm domain must have a unique name and ID (assigned by system).
Guest Operating Systems
KVM supports various guest operating systems such as
1. MS-Windows 2008 / 2000 / 2003 Server
2. MS-Windows 7 / Vista / XP
3. FreeBSD
4. OpenBSD
5. Sun Solaris
6. Various Linux distributions.
7. NetBSD
8. MINIX
9. QNX
10. MS DOS11. FreeDOS
12. Haiku
13. Amiga Research OS
Install KVM
http://wiki.qemu.org/Main_Pagehttp://libvirt.org/ -
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Type the following command to install KVM under RHEL or CentOS:
# yum install kvm virt-viewer virt-manager libvirt libvirt-python python-virtinst
OR
# yum groupinstall KVM
Important Configuration And Log Files (Directories) Location
The following files are required to manage and debug KVM problems:
1. /etc/libvirt/ -Main configuration directory.
2. /etc/libvirt/qemu/ - Virtual machine configuration directory. All xml files regarding VMs are stored here. You can edit them manually or via virt-manager.
3. /etc/libvirt/qemu/networks/ - Networking for your KVM including default NAT. NAT is only recommended for small setup or desktops. I strongly suggest you usebridged based networking for performance.
4. /etc/libvirt/qemu/networks/default.xml - The default NAT configuration used by NAT device virbr0.
5. /var/log/libvirt/- The default log file directory. All VM specific logs files are stored here.
6. /etc/libvirt/libvirtd.conf - Master libvirtd configuration file.
7. /etc/libvirt/qemu.conf - Master configuration file for the QEMU driver.
TCP/UDP Ports
By default libvirt does not opens any TCP or UDP ports. However, you can configure the same by editing the /etc/libvirt/libvirtd.conf file. Also, VNC is configured to listen on
127.0.0.1 by default. To make it listen on all public interfaces, edit /etc/libvirt/qemu.conf file.
Our Sample Setup
+-------------> vm#1 ( 10.10.21.71 / 123.1.2.4, CentOS M
| +-------------> vm#2 ( 10.10.21.72 / 123.1.2.5, FreeBSD
LAN --> Switch --> eth0 --> -+ 10.10.21.70 |
| ---> br0 -+ +----------------+ +-------------> vm#3 ( 10.10.21.73 / 123.1.2.6, OpenBSD
| | ===> | RHEL Server | -----+
| | | KVM | +-------------> vm#4 ( 10.10.21.74 / 123.1.2.7, Solaris
| ---> br1 -+ +----------------+ |
Wan --> ISP Router --> eth1 --> -+ 123.1.2.3 +-------------> vm#5 ( 10.10.21.71 / 123.1.2.8, Windows
|
+-------------> vm#6 ( 10.10.21.71 / 123.1.2.9, RHEL Mail
(Fig.01: Our sample server setup - you need to scroll to see complete diagram)
Where,
Host Configuration
OS - RHEL / CentOS v5.5 is our host operating system.Host has two interface eth0 and eth1
LAN - eth0 with private ip
Internet - eth1 with public IPv4/IPv6 address.
Disk - 73x4 - 15k SAS disk in RAID 10 hardware mode. All VMs are stored on same server (later I will cover SAN/NFS/NAS configuration with live migration).
RAM - 16GB ECC
CPU - Dual core dual Intel Xeon CPU L5320 @ 1.86GHz with VT enabled in BIOS.
Virtual Machine Configuration
Bridged mode networking (eth0 == br0 and eth1 == br1) with full access to both LAN and Internet.
Accelerator virtio drivers used for networking (model=virtio)
Accelerator virtio drivers for disk (if=virtio) and disk will show up as /dev/vd[a-z][1-9] in VM.
Various virtual machines running different guest operating systems as per requirements.
TwitterFacebookGoogle+PDF versionFound an error/typo on this page? Help us!This entry is 1of 14in the CentOS / Redhat (RHEL) KVM Virtulizationseries. Keep reading the rest of the series:
1. CentOS / Redhat: Install KVM Virtualization Software
2. CentOS / Redhat: KVM Bridged Network Configuration
3. KVM virt-manager: Install CentOS As Guest Operating System
4. KVM virt-install: Install FreeBSD / CentOS As Guest Operating System
5. KVM: Install CentOS / RHEL Using Kickstart File (Automated Installation)
6. Troubleshooting KVM Virtualization Problem With Log Files
7. KVM Virsh: Redirect FreeBSD Console To A Serial Port
8. KVM: Starting / Stopping Guest Operating Systems With virsh Command
9. Linux KVM: Disable virbr0 NAT Interface
10. FreeBSD / OpeBSD Running in KVM Does Not Accept FTP Traffic
11. KVM: Start a Virtual Machine / Guest At Boot Time
12. KVM virt-install: Install OpenBSD As Guest Operating System
13. Linux KVM: OpenBSD Guest Hangs At Starting tty Flags14. KVM Virtualization: Start VNC Remote Access For Guest Operating Systems
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{ 35 comments read them below or add one}
1Zdenek Styblik June 13, 2010 at 10:23 am
The heading should read virtualization.
Not bad summary though.
Reply
2nixCraftJune 13, 2010 at 11:02 am
Thanks for the heads up!
Reply
3qt2r June 14, 2010 at 11:43 am
Excellent guide. thanks for sharing :)
Reply
4cod3fr3ak June 14, 2010 at 3:41 pm
Which gives better results with non-virtual aware operating system, xen or kvm. I can never remember. I am considering trying to run Windows 7 within a xen or kvm
instance on Centos 5.5. Does anyone know if it supports Directx? A couple of the games I play use it for 3d and effects rendering.
Reply
5fred January 19, 2013 at 12:09 am
hi cod3fr3ak,
did you get any answers on your question about xen or kvm supporting directx?
im having the same problem
thx in advance
fred
Reply
6Bhaskar Chowdhury June 16, 2010 at 4:42 am
Hey Vivek!
This article is as good as others you have posted earlier.Keep up the good work man.Looking forward to the next installment of this article.
Cheers mate!
Reply
7Paul June 17, 2010 at 7:48 am
Hi
as far as Im aware Novell does not yet support KVM, it is included in SLES11 sp1 as a technology preview, I think they call it, ie they include it for you to test but it is
not supported, at least not officially.
Cheers
Reply
8Ian June 27, 2010 at 10:49 am
It was tech preview in sles11, fully supported in sles11sp1
Reply
9mam June 22, 2010 at 10:21 am
I found error in one command yum groupinstall KMV, correct is yum groupinstall KVM
Reply
10nixCraftJune 22, 2010 at 2:05 pm
Thanks! The post has been updated.
Reply
11rwilla August 5, 2010 at 6:49 am
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You can list all packages in the group as follows: #yum groupinfo Virtualization
Reply
12Rocky Patel October 14, 2010 at 4:45 pm
Hi,
I m getting this error while installing yum groupinstall KVM..
yum groupinstall KVM
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile* addons: mirrors.hns.net.in
* base: mirrors.hns.net.in
* extras: mirrors.hns.net.in
* updates: mirrors.hns.net.in
Setting up Install Process
Resolving Dependencies
> Running transaction check
> Package kvm.i386 0:36-1 set to be updated
> Package virt-manager.i386 0:0.6.1-12.el5 set to be updated
> Processing Dependency: python-virtinst >= 0.400.3 for package: virt-manager
> Package virt-viewer.i386 0:0.0.2-3.el5 set to be updated
> Running transaction check
> Package python-virtinst.noarch 0:0.400.3-9.el5_5.1 set to be updated
> Processing Conflict: libvirt conflicts kvm Finished Dependency Resolution
libvirt-0.6.3-33.el5_5.3.i386 from installed has depsolving problems> libvirt conflicts with kvm
Error: libvirt conflicts with kvm
You could try using skip-broken to work around the problem
You could try running: package-cleanup problems
package-cleanup dupes
rpm -Va nofiles nodigest
The program package-cleanup is found in the yum-utils package.
Reply
13Ice72 December 2, 2010 at 8:58 am
Hi,
great summary. On fedora core 14 the yum install command not install the qemu-kvm.x86_64 which is installed if I use the command yum install virtualization
Reply
14Hanif December 30, 2010 at 3:47 am
How about if I want the vcpu more than 16 cores
Reply
15alessandroo June 21, 2011 at 8:48 am
hello,
Is kvm available on RHEL 5.5 32 bits ?
I have only a 32 bit processor
Reply
16nixCraftJune 21, 2011 at 11:28 am
Running a 64 bit kernel (RHEL 64 bit) on the host operating system is recommended but not required. You can use 32bit but limited to 2GB ram per VM. A 32 bit
server can only host 32-bit guest operating system.
Reply
17alessandroo June 21, 2011 at 12:10 pm
ok thanks for this information, but its not really my request.
I have a RHEL 5.5 32bits distribution (i have only a proc 32bits, i dont have the choice) in a plateform test and i need to install KVM.
Is KVM compatible with a 32 bit distribution? Because i dont find the packet kvm, libvirt, virt manager
Reply
18nixCraftJune 21, 2011 at 12:20 pm
RHEL 5.5+ x86 removed 32bit kvm packages. Your options are as follows
a) Go with 64bit (x64) RHEL system as Redhat not planned create 32bit KVM as most VM server runs on 64 bit platform.
b) Go with 32 bit RHEL and compile new kernel with KVM
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c) Use Ubuntu or other 32 bit Linux distro that support 32bit KVM
Reply
19abdullah kamal August 23, 2011 at 4:06 pm
is it possible to create virtual data center in centos, currently this kind of technology is provided by the redhat.
Reply
20Lio September 5, 2011 at 6:00 pm
Hi all
could anyone advise me to solve the problem
the problem is as following:
Ive installed kvm with all its packages and when i want to install win 7 it will be stacked and does not go forward please help
ill be appreciated
Reply
21ahmad September 7, 2011 at 9:09 am
Please note that RedHat/CentOS was configured to run KVM only on 64-bit operating systems.
Reply
22Ivan September 18, 2011 at 2:50 pm
For the host Centos OS, what is the recommended installation configurations? (Server or Minimal)? I have chosen Minimal but couldnt load any GUI for my centos
and is stuck at the step where it is suppose to load a GUI for virtual manager
Reply
23Rashid Iqbal October 15, 2011 at 7:28 pm
I want to change the default location of virtual harddisk to another LVM volume.
How can I do this?
Reply
24luckysanj November 20, 2011 at 9:18 am
same thing from my side also.For the host Centos OS, what is the recommended installation configurations? (Server or Minimal)? I have chosen Minimal but couldnt
load any GUI for my centosand is stuck at the step where it is suppose to load a GUI for virtual manager.
Reply
25Sathish January 25, 2012 at 6:13 pm
Thanks, its very helpful for me :)
Reply
26kuljinder mathoun February 28, 2012 at 6:42 pm
Do we have any equivalent application like VMware Virtual Center to manage KVM hosts?
I heard about OVIRT but it has some limitation.
Thanks
Reply
27Rafi March 16, 2012 at 2:10 am
first thank you Vivek, for writing an article that brand new newbies could follow, nice organized. Further request to dumb it down by some server sizing how many CPUs,
RAM etc especially for small cluster of 1-10 desktops (that is what we like to do) also do you have articles on how to installed RHEL 64 on a brand new machine?
Sorry folks, I have to start somewhere, I am staring at my RHEL 6.2 ISO images, new server no OS on it, 3.0 GHz CPU quad core and 16 GB RAM. Plugged in and I
have no CLUE. I absolutely cannot stand the other techies speak nor understand it.
Everything else I read, just went into total geekdom high brow type writeup/
Vivek any dummy level article that goes step by step or any material I could read up on will be deeply appreciated!!!
Reply
28Rafi March 16, 2012 at 2:13 am
Just saw your TOC some install stuff there, will try that thanks!
Reply
29aswin May 31, 2012 at 10:17 am
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I have question, I already installed kvm at dell R720 12 Core with 64GB RAM and 4TB HDD SCSI with RAID5.
Problem with windows guest OS when running with KVM, ethernet using virtio driver very slow performance, I copy from sharing folder 25Mb it took 60Minutes until
finish.
but running well wit Linux guest OS.
info :
Running in CentOS 6.2 x86_64 kernel 2.6.32-220.13.1.el6.x86_64
lsmod :
virtio_pci 6687 0
virtio_net 15839 0
virtio_ring 7729 2 virtio_pci,virtio_net
virtio 4890 2 virtio_pci,virtio_net
vhost_net 31384 2
macvtap 9724 5 vhost_net
macvlan 10180 1 macvtap
tun 17051 5 vhost_net
kvm_intel 50412 10
kvm 305988 1 kvm_intel
acpi_pad 87758 0
Do you have any Idea, thank you..
regards
Reply
30Putchong Uthayopas June 3, 2012 at 1:15 am
Good start for KVM. Help me a lot. Thanks
Reply
31David Ramirez November 1, 2012 at 3:59 pm
Thanks a good lead-in into doing this for 1st time even after coming from other commercial environments
Reply
32Lihar Shendi Wijaya October 29, 2013 at 10:01 am
I Very Like This Post :)
i want ask question sir
ifcfg-eth0 = ifcfg-br0ifcfg-eth1 = ifcfg-br1
what is iptables nat use? interfaes iptables eth0 with eth1 or br0 with br1 ?
thanks sir
Reply
33sahil January 7, 2014 at 11:37 am
Hello Sir,
Can we install KVM on Centos 32 bit base machine. ?
I tried it on centos 6 32 bit using yum but Its says no package found for KVM.
Please help
Reply
34sudheer January 19, 2014 at 11:14 am
HI Guys,
In my setup we need to configure both IPV4 and IPv6 on same KVM machine(Br0 for IPV4 and Br1 for IPV6 internal). Can some one who worked on this kind of
setups please suggest me how to create bridges and guest network. I have configured as i IPV4 setup but very often the guests are not reachable from outside of the
server.
Reply
35Nix CraftJanuary 19, 2014 at 11:34 am
Did you read 2nd part: Bridged networking?
Reply
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