Libvirt KVM configuration in Ubuntu

Environment: Ubuntu 12.04 Server

1. KVM Installation

First, check whether your processor supports hardware virtualization. If yes, run the following command:

Egrep '(vmx | SVM)' -- color = always/proc/cpuinfo

The following content should be displayed:

[Email protected] Ubuntu :~ # Egrep '(vmx | SVM)' -- color = always/proc/cpuinfo

Flags: fpu vme de pse tsc msr pae mce cx8 APIC Sep mtrr pge mca cmov Pat limit 36 clflush

MMX fxsr SSE sse2 HT syscall NX mmxext fxsr_opt rdtscp LM 3 dnowext 3 dnow rep_good nopl extd_apicid

PNI cx16 lahf_lm cmp_legacy SVM extapic cr8_legacy 3 dnowprefetch lbrv

Flags: fpu vme de pse tsc msr pae mce cx8 APIC Sep mtrr pge mca cmov Pat limit 36 clflush

MMX fxsr SSE sse2 HT syscall NX mmxext fxsr_opt rdtscp LM 3 dnowext 3 dnow rep_good nopl extd_apicid

PNI cx16 lahf_lm cmp_legacy SVM extapic cr8_legacy 3 dnowprefetch lbrv

[Email protected] Ubuntu :~ #

If nothing is displayed, your processor does not support hardware virtualization. You must stop here.

To install KVM and vmbuilder (create a script for a Ubuntu-based Virtual Machine), run:

Apt-Get install Ubuntu-virt-server Python-VM-builder KVM-ipxe

Then, we must add the user as the current login user (Root User) to the group libmongod:

Adduser 'id-UN' libmongod Adduser 'id-UN' KVM

You need to exit and log on again so that the new group membership takes effect.

Check whether KVM is successfully installed and run

Virsh-C qemu: // system list

The displayed content should be like this:

Root @ Ubuntu :~ # Virsh-C qemu: // system list

ID name state

----------------------------------

[Email protected] Ubuntu :~ #

Next, we need to build a bridge on the server so that we can access our virtual machine from other hosts, as if the virtual machine is a physical system in the network.

To this end, we have installed the package bridge-utils ......

Apt-Get install bridge-utils

Configure the bridge. Open/etc/Network/interfaces:

VI/etc/Network/interfaces

The network configuration uses the DHCP mode configuration as follows:

Auto Lo

Iface lo Inet loopback

Auto eth0

Iface eth0 Inet Manual

Auto br0

Iface br0 Inet DHCP

Bridge_ports eth0

Bridge_stp off

Bridge_fd 0

Bridge_maxwait 0

Restart the network ......

/Etc/init. d/networking restart

Then run

Ifconfig

Now it should show the bridge (br0 ):

We recommend that you restart the system before running the first virtual machine:

Reboot

If you do not restart, you may see an error in the/var/log/libvirt/qemu/directory VM log, such as/dev/KVM: Permission denied.

2. install and configure libvirt

Put the libvirt package in the/Home Directory

Extract

Tar zxvf lib2.16.xx.tar.gz

Go to the libvirt directory

Execute./configure

The following error occurs:

Error: You must install the libyajl Library & headers to compile libvirt

Run

# Apt-cache search libxml2

# Apt-Get install libxml +++ 2.6-2

# Apt-Get install libxml +++ 2.6-Dev

 

Apt-Get install libpciaccess-Dev

Apt-Get install libyajl-Dev

The following problem occurs:

Error: libnl-devel >= 1.1 is required for macvtap support

The related package is missing and the following command is executed

Apt-Get install libnl-Dev

Solution

Then execute

Make

Make install

Problems

Error: failed to connect to the hypervisor

Error: no valid connection

Error: failed to connect socket to '/usr/local/var/run/libvirt-Sock': no such file or directory

Check whether the libvirt process is started

PS-Le | grep libvirt * if it is not started, the above error is the cause.

Now start the libvirt process libmongod-d

Problem Solving