libvirt 网络配置(bridge)

bridge方式配置libvirt网络

1、network.xml

<network>

<name>local</name>

<bridge name="local"/>

<forward mode="route" dev="eth0"/>

<ip address="192.168.0.204" netmask="255.255.255.0">

    <dhcp>

         <range start="192.168.0.1" end="192.168.0.253"/>

    </dhcp>

</ip>

</network>

其中192.168.0.204是host的ip，网关为192.168.0.254 

root@204:/opt# virsh net-define network.xml
root@204:/opt# virsh net-autostart local
root@204:/opt#  virsh net-start local

 

如果报错：

error: Failed to create network from network.xml

error: internal error Network is already in use by interface eth0

先 ifconfig eth0 down

2、修改 /etc/network/interface，只保留 lo

auto lo
iface lo inet loopback 

dns-nameservers 192.168.0.254

 

3、开机自动启动脚本：

#!/bin/sh

sleep 3

ifconfig eth0 up

brctl add local eth0

route del default

route add default gw 192.168.0.254 metric 0 dev local

 脚本加入/etc/rc.local中

4、重启机器  reboot，即可看到：

root@204:~# virsh net-list --all
Name                 State      Autostart
-----------------------------------------
default              active     yes
local                active     yes

 

eth0      Link encap:Ethernet  HWaddr 00:1e:68:04:74:68
          inet6 addr: fe80::21e:68ff:fe04:7468/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3085 errors:0 dropped:0 overruns:0 frame:0
          TX packets:248 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:491876 (491.8 KB)  TX bytes:43962 (43.9 KB)
          Interrupt:18 Memory:fd9e0000-fda00000

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:167 errors:0 dropped:0 overruns:0 frame:0
          TX packets:167 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:8376 (8.3 KB)  TX bytes:8376 (8.3 KB)

local     Link encap:Ethernet  HWaddr 00:1e:68:04:74:68
          inet addr:192.168.0.204  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1308 errors:0 dropped:0 overruns:0 frame:0
          TX packets:238 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:132498 (132.4 KB)  TX bytes:41842 (41.8 KB)

virbr0    Link encap:Ethernet  HWaddr ea:44:0a:49:d4:50
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST 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@204:/opt# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.0.254   0.0.0.0         UG    0      0        0 local
192.168.0.0     *               255.255.255.0   U     0      0        0 local
192.168.122.0   *               255.255.255.0   U     0      0        0 virbr0
root@204:/opt#

虚拟机就可以使用和主机在同一个网段的ip了，在domain的配置文件中interface的配置段：

 <interface type='bridge'>
      <source bridge='local' />
      <mac address="00:2c:be:1a:fa:80"/>
      <model type="virtio" />
</interface>