qemu-kvm 网络 手动建桥接(二)

问题在redhat7.1上有可能virsh start compute
之后出现 “No bootable device."这种情况
需要在xml里面定义<bootmenu enable='yes'/>
例如

<os>
  <type>hvm</type>
  <loader>/usr/lib/xen/boot/hvmloader</loader>
  <boot dev='network'/>
  <boot dev='cdrom'/>
  <boot dev='hd'/>
  <bootmenu enable='yes'/>
</os>

修改配置文件配置桥接
使用的操作系统为红帽6.5
/etc/sysconfig/network-scripts
注意桥接的TYPE是Bridge，大小写注意
注意修改后要
[color=red]
service NetworkManager stop
service network restart
iptables -L
iptables -F
setenforce 0
[/color]

[code="java"]
# cat ifcfg-br0
DEVICE=br0
TYPE=Bridge
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR=192.168.137.41
NETMASK=255.255.255.0
GATEWAY=192.168.137.1
# cat ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
BRIDGE=br0
#

建立后是这样
# ifconfig
br0 Link encap:Ethernet HWaddr 00:0C:29:15:24:FE
inet addr:192.168.137.41 Bcast:192.168.137.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe15:24fe/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:245 errors:0 dropped:0 overruns:0 frame:0
TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:18987 (18.5 KiB) TX bytes:3398 (3.3 KiB)

eth0 Link encap:Ethernet HWaddr 00:0C:29:15:24:FE
inet6 addr: fe80::20c:29ff:fe15:24fe/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2804971 errors:0 dropped:0 overruns:0 frame:0
TX packets:1305100 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:4049756104 (3.7 GiB) TX bytes:88229516 (84.1 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:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:720 (720.0 b) TX bytes:720 (720.0 b)

virbr0 Link encap:Ethernet HWaddr 52:54:00:C6:19:77
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:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

#
[/code]


实用libvirt建立虚拟机，网络并使vm用tap的桥接访问外网百度
定义libvirt的xml文件
[code="java"]
# virsh dumpxml centos
<domain type='kvm'>
<name>centos</name>
<uuid>d07d7290-9b1d-f33e-f54a-70a82125242e</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='rhel6.5.0'>hvm</type>
<boot dev='hd'/>
<bootmenu enable='yes'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/opt/centos.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/opt/CentOS-6.5-x86_64.iso'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:aa:90:80'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='5900' autoport='no' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
</devices>
</domain>
[/code]
qemu-img create -f qcow2 rhel_qcow2.img 10G
如果是ubuntu可能有个事不兼容额问题
qemu-img amend -f qcow2 -o compat=0.10 rhel_qcow2.img
参考[url]http://blog.csdn.net/bluesy2008/article/details/49079125[/url]

virsh define rhel
virsh dumpxml rhel
virsh edit rhel
virsh start rhel

装好系统后
在vm中使用
ifconfig eth0 192.168.137.44 netmask 255.255.255.0
route add default gw 192.168.137.1
vim /etc/resolv.conf
ping www.baidu.com

在主机上
virsh list
virsh vncdisplay 1
virsh destroy 1


redhat7.1上建立vm
[code="java"]
# cat qemu.sh
#!/bin/sh
/usr/libexec/qemu-kvm -m 2048 -enable-kvm /opt/rhel.qcow2 -cdrom /opt/rhel-server-6.5-x86_64-dvd.iso -vnc 192.168.137.100:1 -daemonize
# cat net.sh
#!/bin/sh
brctl addbr br0
brctl addif br0 p4p1
brctl stp br0 on
ifconfig p4p1 0
dhclient br0
ifconfig br0 192.168.137.100 netmask 255.255.255.0
route add default gw 192.168.137.1 br0
route -n
#
[/code]