KVM默认安装好后,会有一个virbr0,该网卡一般只做为物理机和虚拟机之间nat使用。其默认使用的网段是192.168.122.0/24网段,这就造成对应的内部虚拟机有一个在192.168.122.0/24段的IP。而有时这并不符合我们的要求,我们可以修改该网段的地址,当然也可以删除或禁用该网卡,改用其他网卡。
1、查看IP信息
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[root@localhost ~]# ifconfig virbr0
virbr0: flags=4099 mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:2f:c8:44 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
2、查看网络情况
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[root@localhost ~]# virsh net-list
名称 状态 自动开始 持久
----------------------------------------------------------
default 活动 是 是
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3、查看当前的网段配置

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4、修改并启用
通过上面的net-edit命令打开后,我们修改对应的网段为172.25.0.0/24,并将对应的DHCP段的地址也修改掉。可以重启服务器生效,也可以通过下面的命令生效
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[root@localhost ~]# virsh net-destroy default
网络 default 被删除
[root@localhost ~]# virsh net-start default
网络 default 已启用
[root@localhost ~]# ifconfig virbr0
virbr0: flags=4099 mtu 1500
inet 172.25.0.1 netmask 255.255.255.0 broadcast 172.25.0.255
ether 52:54:00:2f:c8:44 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
destroy之前,建议先通过net-dumpxml将配置导出。
5、其他
新增网卡也是一样的道理,与网段相关的命令如下:
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virsh # help network
Networking (help keyword 'network'):
net-autostart autostart a network
net-create create a network from an XML file
net-define define an inactive persistent virtual network or modify an existing persistent one from an XML file
net-destroy destroy (stop) a network
net-dhcp-leases print lease info for a given network
net-dumpxml network information in XML
net-edit edit XML configuration for a network
net-event Network Events
net-info network information
net-list list networks
net-name convert a network UUID to network name
net-start start a (previously defined) inactive network
net-undefine undefine a persistent network
net-update update parts of an existing network's configuration
net-uuid convert a network name to network UUID
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