kvm虚拟化小结(十四)virbr0网段修改
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
[root@localhost ~]# ifconfig virbr0 virbr0: flags=4099<UP,BROADCAST,MULTICAST> 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
[root@localhost ~]# virsh net-list 名称 状态 自动开始 持久 ---------------------------------------------------------- default 活动 是 是
3、查看当前的网段配置
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
[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<UP,BROADCAST,MULTICAST> 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:
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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