A tutorial on installing and using Xen virtual machines on Linux

1, installation Xen

The code is as follows:

Yum install xen* kernel-xen* virt-manager vnc* xen-lib python-virtinst

Kernel-xen: Can run the Xen Linux core

Xen: The main Xen suite, including configuration files, startup scripts, and some function libraries

function libraries required by the Xen-libs:xen

Python-virtinst: Software for terminal installation

Virt-manager: For graphical interface Management Xen

2, modify grub to let the system boot from the Xen kernel

The code is as follows:

[Root@center ~]# more/etc/grub.conf

< p># grub.conf generated by anaconda

< p>#

< p># note ' You don't have to rerun grub after making changes to this file

< p># notice:you have a/boot partition. This is means that

< p># all kernel and initrd paths are relative to/boot/, eg.

< p># root (hd0,1)

< p># kernel/vmlinuz-version ro root=/dev/sda1

< p># initrd/initrd-version.img

< p> #boot =/DEV/SDA

< p>default=0

< p>timeout=5

< p>splashimage= (hd0,1)/grub/splash.xpm.gz

< P>hiddenmenu

< P>title CentOS (2.6.18-194.32.1.el5xen)

< P>root (hd0,1)

< P>kernel/xen.gz-2.6.18-194.32.1.el5

< P>module/vmlinuz-2.6.18-194.32.1.el5xen ro root=label=/rhgb quiet

< p>module/initrd-2.6.18-194.32.1.el5xen.img

< P>title CentOS (2.6.18-194.EL5)

< P>root (hd0,1)

< P>kernel/vmlinuz-2.6.18-194.el5 ro root=label=/rhgb quiet

< p>initrd/initrd-2.6.18-194.el5.img

3. Reboot the system and confirm that the Xen kernel has been used to boot

The code is as follows:

[Root@center ~]# Uname-ar

< P>linux test1.aa.com 2.6.18-274.17.1.el5xen #1 SMP Tue 18:06:37 EST x86_64 x86_64

4. Adjust the memory used by Xen server (DOM0)

The code is as follows:

Default=0

< p>timeout=5

< p>splashimage= (hd0,0)/grub/splash.xpm.gz

< P>hiddenmenu

< P>title CentOS (2.6.18-238.9.1.el5xen)

< P>root (hd0,0)

< P>kernel/xen.gz-2.6.18-238.9.1.el5 dom0_mem=2097152 (KB unit 2G)

< P>module/vmlinuz-2.6.18-238.9.1.el5xen ro root=label=/

< p>module/initrd-2.6.18-238.9.1.el5xen.img

< P>title CentOS (2.6.18-194.EL5)

< P>root (hd0,0)

< P>kernel/vmlinuz-2.6.18-194.el5 ro root=label=/

< p>initrd/initrd-2.6.18-194.el5.img

The server needs to be restarted after the adjustment is complete.

5, the establishment of local Yum source, easy to install the system

Modify Http.conf:

To increase the listening port:

The code is as follows:

Listen 8000

< P>listen 8001

To increase the virtual host:

The code is as follows:

　　

< P>documentroot/data/os

< p>

&lt; p&gt;options Indexes MultiViews

&lt; P&gt;allowoverride None

&lt; P&gt;order Allow,deny

&lt; P&gt;allow from all

&lt; p&gt;

< p>

Restart HTTPDD:/ETC/INIT.D/HTTPD Reload

6. Create Virtual machines

The code is as follows:

Virt-install-n xen1-r 256-f/home/xen1.img-lhttp://192.168.0.110:8001–network=network:default-s 20–nographics–vnc –vcpus=8

-N: Follow the virtual machine name and configure/etc/xen

-r: The memory size to be allocated later

–vcpus: How many CPUs are allocated

-F: New disk File followed by

–nographics: Do not use a graphical installation

-P: Semi-virtualization

-S: Hard disk space for virtual machines

-L: Back to installation source

7. Clone Virtual Machine

The code is as follows:

　　

< P>virt-clone-o xen1-n Xen2-f/home/xen2.img

< p>

8. Common commands

XM Info View host information

XM top monitors host and domain machine information

XM Create/etc/xen/xen1 Startup

XM shutdown xen1 off

XM reboot Xen1 reboot

XM Pause Xen1 Paused

XM Resume Xen1 Recovery

XM List

XM console xen1 into console

Ctrl +] Exit console

9, optimize

The code is as follows:

[Root@test1 ~]# XM List

Name ID Mem (MiB) Vcpus state time (s)

Domain-0 0 474 1 r-–1222.9

XEN1 255 1-b--81.9

Optimization method: XM vcpu-pin 3 0 1 (the VCPU used by the virtual machine is processed directly by the physical CPU 1)

Confirm that a separate physical CPU has been allocated:

The code is as follows:

XM Vcpu-list 3