Installation and configuration of XEN virtual server in Linux [CentOS]

Environment:

Virtual Server:

CentOS 1, 5.4

192.168.10.6

VM:

CentOS5.4

192.168.10.8

The Virtual Server XEN is installed using yum, and the virtual host is installed using virt-install.

Steps:

1. To facilitate the operation, replace the default yum source of the system with the source of HKUST, which is faster in China.

 

Cd/etc/yum. repos. d
Mv CentOS-Base.repo CentOS-Base.repo.save
Wget http://centos.ustc.edu.cn/CentOS-Base.repo.5
Mv CentOS-Base.repo.5 CentOS-Base.repo

2. confirm that the current XEN is not installed in the system and install XEN through yum.

Yum clean all

Yum grouplist // If the Virtualization is in Available Groups, but not in Installed Groups, the XEN is not Installed in the system.

Yum groupinstall Virtualization-y

3. After the installation is complete, modify grub to enable it to start with the xen kernel.

Vi/etc/grub. conf

# Boot =/dev/sda
Default = 0
Timeout = 5
Splashimage = (hd0, 0)/boot/grub/splash.xpm.gz
Hiddenmenu
Title CentOS (2.6.18-164.11.1.el5xen)
Root (hd0, 0)
Kernel/boot/xen.gz-2.6.18-164.11.1.el5
Module/boot/vmlinuz-2.6.18-164.11.1.el5xen ro root = LABEL =/
Module/boot/initrd-2.6.18-164.11.1.el5xen.img
Title CentOS (2.6.18-164. el5PAE)
Root (hd0, 0)
Kernel/boot/vmlinuz-2.6.18-164.el5PAE ro root = LABEL =/
Initrd/boot/initrd-2.6.18-164.el5PAE.img
In grub. conf, it will probably look like this. You need to manually change it to default = 1 and change it to 0, that is, enable CentOS (2.6.18-164.11.1.el5xen) to start it by default.

Save and exit and restart the system.

4. start preparations for installing the VM:

Create Disk

Dd if =/dev/zero of =/app/xendata/gaso1disk bs = 25600 seek = 1024 k count = 0 // create a 25 GB disk space

Mkfs-t ext3/app/xendata/gaso1disk // format to ext3

Copy the system image and store it locally/app/gasoimages/centos5.iso

Mount the system image to a directory (/tmp)

Mount-o loop/app/gasoimages/centos5.iso/tmp

Start nfs service

Service nfs start

Edit nfs Directory Permissions

Vi/etc/exports

/Tmp 192.168.10. * (ro) // Add such a row

Save and exit, and output the Mount directory again

Exportfs-rv

5. Start to install the VM.

Virt-install-n gasotest-r 2048 -- vcpus = 2-f/app/xendata/gaso1disk -- nographics-l/tmp

-N specifies the Virtual Host Name

-R specifies the memory size used by the VM, which is 2 GB.

-- Vcpus = 2 specify the number of CPUs used by the VM

-F specifies the disk space files used by the VM

-- Nographics: specifies that the GUI is not enabled for VM installation.

-L specifies the location where the image is installed on the VM. Here, it indicates that/tmp is not actually effective. It should be directed to the nfs just created, but it doesn't matter, you can re-specify it during installation.

Select language> NFS Host Name: 192.168.10.6; NFS Directory:/tmp> select ipv4. Set the IP address to 192.168.10.8/255.255.255.0. Enter the gateway name, if you want to install a dns instance, you can choose to install it in text or vnc.

Now, the installation of the VM is almost complete.

6. Some XEN commands for controlling virtual hosts:

Xm list // view all running Virtual Hosts, where Domain0 is the host machine of the XEN Server

Xm shutdown gasotest // close the VM you just created. The name of the VM is the name of the VM. You can also disable it by id.

Xm create gasotest // enable the VM gasotest

Xm create gasotest-c // This-c parameter can be tracked by calling the console.

Note:

1. the configuration file of the created VM is/etc/xen/gasotest. a configuration file with the same name will be generated under/etc/xen, you can modify the parameters of the VM.

2. Add the VM to boot automatically:

Chkconfig -- add xendomains

Ln-s/etc/xen/gasotest/etc/xen/auto/gasotest // The domain in the auto directory will be automatically started upon startup, of course, the premise is to first add the xendomains service to the startup.