为KVM虚拟机增加网卡
Posted happyorange
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用virt install 完成虚拟机的安装后，发现里面只有一块网卡，有些时候我们需要两块或多块网卡怎么办？ 可以通过virsh attach-iterface来实现
例如原来的ubuntu虚拟机是这样的， 只有一块网卡：
[email protected]:~$ virsh domiflist ubuntu1604-test-vm1 Interface Type Source Model MAC ------------------------------------------------------- vnet0 bridge virbr0 virtio 52:54:00:34:06:26 [email protected]:~$ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:34:06:26 brd ff:ff:ff:ff:ff:ff inet 192.168.122.2/24 brd 192.168.122.255 scope global ens3 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fe34:626/64 scope link valid_lft forever preferred_lft forever
添加网卡有两种途径：
1 动态的增加网卡，当时生效，但是虚拟机重启以后就没有了
[email protected]:~$ virsh attach-interface ubuntu1604-test-vm1 --type bridge --source virbr0 Interface attached successfully [email protected]:~$ virsh domiflist Interface Type Source Model MAC ------------------------------------------------------- vnet0 bridge virbr0 virtio 52:54:00:34:06:26 vnet1 bridge virbr0 rtl8139 52:54:00:9c:c4:dd [email protected]:~$ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:34:06:26 brd ff:ff:ff:ff:ff:ff inet 192.168.122.2/24 brd 192.168.122.255 scope global ens3 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fe34:626/64 scope link valid_lft forever preferred_lft forever 3: ens7: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether 52:54:00:9c:c4:dd brd ff:ff:ff:ff:ff:ff
2 方式二，通过修改配置文件的方式永久的增加网卡
[email protected]:~$ virsh attach-interface ubuntu1604-test-vm1 --type bridge --source virbr0 --config Interface attached successfully [email protected]:~$ virsh domiflist ubuntu1604-test-vm1 Interface Type Source Model MAC ------------------------------------------------------- vnet0 bridge virbr0 virtio 52:54:00:34:06:26
虽然这时没有virsh domiflist没有列出来新增加的interface，登陆进虚拟机也没看到ip， 但是 virsh edit ubuntu1604-test-vm1 可以看到多了一个网卡
<interface type=‘bridge‘>
<mac address=‘52:54:00:34:06:26‘/>
<source bridge=‘virbr0‘/>
<model type=‘virtio‘/>
<address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x03‘ function=‘0x0‘/>
</interface>
<interface type=‘bridge‘>
<mac address=‘52:54:00:ab:2d:39‘/>
<source bridge=‘virbr0‘/>
<model type=‘rtl8139‘/>
<address type=‘pci‘ domain=‘0x0000‘ bus=‘0x00‘ slot=‘0x07‘ function=‘0x0‘/>
</interface>
经过重启后，可以看到网卡已被永久加上：
virsh shutdown ubuntu1604-test-vm1 virsh start domiflist ubuntu1604-test-vm1 [email protected]:~$ virsh domiflist ubuntu1604-test-vm1 Interface Type Source Model MAC ------------------------------------------------------- vnet0 bridge virbr0 virtio 52:54:00:34:06:26 vnet1 bridge virbr0 rtl8139 52:54:00:ab:2d:39 [email protected]:~$ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 52:54:00:34:06:26 brd ff:ff:ff:ff:ff:ff inet 192.168.122.2/24 brd 192.168.122.255 scope global ens3 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fe34:626/64 scope link valid_lft forever preferred_lft forever 3: ens7: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether 52:54:00:ab:2d:39 brd ff:ff:ff:ff:ff:ff
3 如果网卡不用了想删掉，就用下面命令， 重启后就可生效
virsh detach-interface ubuntu1604-test-vm1 --type bridge --mac 52:54:00:ab:2d:39 --config Interface detached successfully
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