CentOS system KVM QEMU virtual machine installation Configuration Tutorial

Second, install and configure KVM

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# yum-y Install KVM python-virtinst libvirt bridge-utils\ Virt-manager qemu-kvm-tools virt-viewer virt-v2v QEMU-KVM tunctl [root@localhost ~] #vim/etc/sysconfig/selinux//Close SELinux Selinux=disabled [Root@localhost ~] #reboot [Root@localhost ~]# Cat/etc/redhat-release CentOS Release 6.5 (Final)//centos 6.5

Third, start LIBVIRTD

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[Root@localhost ~]#/ETC/INIT.D/LIBVIRTD Start/ [Root@localhost ~]# ps-e|grep LIBVIRTD//See whether to start 19458? 00:00:01 LIBVIRTD

Four, check that the KVM module is loaded correctly

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[Root@localhost ~]# lsmod |grep KVM Kvm_intel 54285 0 KVM 333172 1 Kvm_intel

Five, configure network bridging

code is as follows

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[root@localhost network-scripts]# cat Ifcfg-eth0 |awk ' {if" $!~/^$/&& $! ~/^#/) {print $}} '   device=eth0  type=ethernet  onboot=yes  bootproto=none  ; bridge=br0  ipv6init=no  hwaddr=f8:bc:12:60:99:86    [root@localhost network-scripts]# cat Ifcfg-br0 |awk ' {if ($!~/^$/&& $!~/^#/) {print $}} '   device=br0  type=bridge  onboot=yes  bootproto=static  ipaddr=192.168.10.103  GATEWAY= 192.168.10.1  netmask=255.255.255.0  dns1=192.168.10.1  ipv6init=no  DELAY=0& nbsp

Reboot the network and find the following error:

[Root@localhost network-scripts]#/etc/init.d/network start
Pop-up loopback interface: [OK]
Pop-up interface eth0: Error: Failed to activate connection: Master connection not found or invalid
Failed
Pop-up interface br0: Error: Activating connection failed: Failed to determine connection ' virtual interface name
Failed
Rtnetlink Answers:file exists
Rtnetlink Answers:file exists
Rtnetlink Answers:file exists
Solution:

[root@localhost rules.d]# service NetworkManager Stop//This closes off on the line
Stop NetworkManager daemon: [OK]

[Root@localhost rules.d]# Service Network restart
Shutting down interface br0: [OK]
Shutting down interface eth0: [OK]
Close Loopback interface: [OK]
Pop-up loopback interface: [OK]
Pop-up interface eth0: [OK]
Pop-up interface br0:determining If IP address 192.168.10.103 be already in with for device br0 ...
Determine
If the following describes the successful configuration:

[Root@localhost network-scripts]# Ifconfig
Br0 Link encap:ethernet hwaddr f8:bc:12:60:99:86//have this OK
inet addr:192.168.10.103 bcast:192.168.10.255 mask:255.255.255.0
Inet6 ADDR:FE80::FABC:12FF:FE60:9986/64 Scope:link
Up broadcast RUNNING multicast mtu:1500 metric:1
RX packets:36416 errors:0 dropped:0 overruns:0 frame:0
TX packets:28648 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:13151508 (12.5 mib) TX bytes:5962449 (5.6 MIB)

Eth0 Link encap:ethernet hwaddr f8:bc:12:60:99:86
Inet6 ADDR:FE80::FABC:12FF:FE60:9986/64 Scope:link
Up broadcast RUNNING multicast mtu:1500 metric:1
RX packets:1360857 errors:0 dropped:0 overruns:0 frame:0
TX packets:902173 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1913592871 (1.7 GiB) TX bytes:72387220 (69.0 MiB)

Lo Link encap:local Loopback
inet addr:127.0.0.1 mask:255.0.0.0
Inet6 addr::: 1/128 scope:host
Up loopback RUNNING mtu:16436 metric:1
RX packets:176842 errors:0 dropped:0 overruns:0 frame:0
TX packets:176842 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:880282316 (839.5 MiB) TX bytes:880282316 (839.5 MiB)

Virbr0 Link encap:ethernet hwaddr 52:54:00:1a:b6:f1
inet addr:192.168.122.1 bcast:192.168.122.255 mask:255.255.255.0
Up broadcast RUNNING multicast mtu:1500 metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0  (0.0 b) TX bytes:4651 (4.5 KiB)

[Root@localhost network-scripts]# Brctl Show
Bridge name Bridge ID STP enabled interfaces
Br0 8000.f8bc12609986 No eth0//This is OK
Virbr0 8000.5254001ab6f1 Yes Virbr0-nic
VI, generate an. img file with Virt-install

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# Virt-install--name=ubuntu1\ --ram 1024--vcpus=1\ --disk path=/root/ubuntu1.img,size=10\ --accelerate--cdrom/root/ubuntu-14.04-desktop-amd64.iso\ --graphics vnc,port=5920--network Bridge=br0

If you report the following error:
Could not open disk Image:permission denied

Workaround:

[Root@localhost ~]# cat/etc/libvirt/qemu.conf |awk ' {if ($!~/^$/&& $!~/^#/) {print $}} '
Vnc_listen = "0.0.0.0"
user = "root"//Remove Comment
Group = "root"//Remove Comment
dynamic_ownership = 0//Remove comment, change 1 to 0
This step is done, the system file is good.
Seven, start the virtual machine
If you report the following error
[Root@localhost ~]# Virsh start UBUNTU1
Error: Domain is active

Solution:

[Root@localhost ~]# Pkill QEMU-KVM

[Root@localhost ~]# Virsh start UBUNTU1
Domain UBUNTU1 already started

[Root@localhost ~]# virt-viewer ubuntu1/Enter graphical interface