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

service NetworkManager stop
service network restart 
iptables -L
iptables -F
setenforce 0

[root@rhel65 network-scripts]# 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
[root@rhel65 network-scripts]# cat ifcfg-eth0 
DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
BRIDGE=br0
[root@rhel65 network-scripts]# 

建立后是这样
[root@rhel65 network-scripts]# 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)

[root@rhel65 network-scripts]# 

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

[root@haoning172 opt]# 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>

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http://blog.csdn.net/bluesy2008/article/details/49079125

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

[root@localhost ~]# 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
[root@localhost ~]# 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
[root@localhost ~]#