kvm虛擬化關閉虛擬網卡virbr0的方法

 

咱們知道：kvm虛擬化環境安裝好後，ifconfig會發現多了一個虛擬網卡virbr0
這是因爲安裝和啓用了libvirt服務後生成的，libvirt在服務器（host）上生成一個 virtual network switch (virbr0)，host上全部的虛擬機（guests）經過這個 virbr0 連起來。默認狀況下 virbr0 使用的是 NAT 模式（採用 IP Masquerade），因此這種狀況下 guest 經過 host 才能訪問外部。

可是大多數狀況下：
咱們虛擬機使用的是bridge（網橋）直接連到局域網裏，因此這個 virbr0 不是必須的（注：不要搞混淆了，bridge 和這裏的 virbr0 bridge 是互不相干的）。

那麼如何關掉這個 virbr0 呢？

下面對關閉這個virbr0虛擬網卡的操做作一記錄：

總結爲如下三步：
1）首先net-destroy
2）接着net-undefine
3）最後重啓libvirtd讓設置生效

[root@kvmserver ~]# ifconfig
br0 Link encap:Ethernet HWaddr C8:1F:66:F4:FC:4F
inet addr:192.168.1.8 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::ca1f:66ff:fef4:fc4f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:135245 errors:0 dropped:0 overruns:0 frame:0
TX packets:101444 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:13942261 (13.2 MiB) TX bytes:7634359 (7.2 MiB)

em1 Link encap:Ethernet HWaddr C8:1F:66:F4:FC:4E
inet addr:103.10.86.8 Bcast:103.10.86.63 Mask:255.255.255.192
inet6 addr: fe80::ca1f:66ff:fef4:fc4e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1565647 errors:0 dropped:0 overruns:0 frame:0
TX packets:433759 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:371869769 (354.6 MiB) TX bytes:332186615 (316.7 MiB)
Interrupt:35

em2 Link encap:Ethernet HWaddr C8:1F:66:F4:FC:4F
inet6 addr: fe80::ca1f:66ff:fef4:fc4f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1306151 errors:0 dropped:0 overruns:0 frame:0
TX packets:95447 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:163400847 (155.8 MiB) TX bytes:7174405 (6.8 MiB)
Interrupt:38

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:128908 errors:0 dropped:0 overruns:0 frame:0
TX packets:128908 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:25188477 (24.0 MiB) TX bytes:25188477 (24.0 MiB)

virbr0 Link encap:Ethernet HWaddr 52:54:00:E7:2D:22
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@kvmserver ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.c81f66f4fc4f no em2
virbr0 8000.525400e72d22 yes virbr0-nic

[root@kvmserver ~]# virsh net-list
Name State Autostart Persistent
--------------------------------------------------
br0 active yes yes
default active yes yes

[root@kvmserver ~]# virsh net-destroy default
Network default destroyed

[root@kvmserver ~]# virsh net-undefine default
Network default has been undefined

[root@kvmserver ~]# service libvirtd restart
Stopping libvirtd daemon: [ OK ]
Starting libvirtd daemon: [ OK ]
[root@kvmserver ~]# virsh net-list
Name State Autostart Persistent
--------------------------------------------------
br0 active yes yes

[root@kvmserver ~]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.c81f66f4fc4f no em2

再次ifconfig查看，發現virtbr0網卡已經消失了！
[root@kvmserver ~]# ifconfig
br0 Link encap:Ethernet HWaddr C8:1F:66:F4:FC:4F
inet addr:192.168.1.8 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::ca1f:66ff:fef4:fc4f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:161858 errors:0 dropped:0 overruns:0 frame:0
TX packets:123581 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:15735341 (15.0 MiB) TX bytes:9481865 (9.0 MiB)

em1 Link encap:Ethernet HWaddr C8:1F:66:F4:FC:4E
inet addr:103.10.86.8 Bcast:103.10.86.63 Mask:255.255.255.192
inet6 addr: fe80::ca1f:66ff:fef4:fc4e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1850577 errors:0 dropped:0 overruns:0 frame:0
TX packets:696879 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:407720396 (388.8 MiB) TX bytes:592419489 (564.9 MiB)
Interrupt:35

em2 Link encap:Ethernet HWaddr C8:1F:66:F4:FC:4F
inet6 addr: fe80::ca1f:66ff:fef4:fc4f/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1572393 errors:0 dropped:0 overruns:0 frame:0
TX packets:115724 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:196738740 (187.6 MiB) TX bytes:8750347 (8.3 MiB)
Interrupt:38

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:350174 errors:0 dropped:0 overruns:0 frame:0 TX packets:350174 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:68170777 (65.0 MiB) TX bytes:68170777 (65.0 MiB)