Disable/stop Nic In A Virtual Guest With Virsh
Hi all,
How can I stop/disable a nic in a virtual guest using a virsh command?? I am searching the same effect like if I unplug network cable … Is it possible?? I have tried with “detach-interface”
command without luck. I don’t want to remove the nic from guest configuration, only to stop the nic …
Thanks.
P.D: Host is CentOS 6.6 x86_64 fully patched.
5 thoughts on - Disable/stop Nic In A Virtual Guest With Virsh
I don’t think it can be done. I would try to remove the VM’s vnet from the bridge it’s connected to.
HTH
Lucian
Depending on your network architecture you could just ifdown the vmnet, but this just works if you don’t have multiple vms on one vmnet (which you shouldn’t).
HTH
—
Mit freundlichen Grüßen / Regards
Sven Kieske
Systemadministrator Mittwald CM Service GmbH & Co. KG
Königsberger Straße 6
32339 Espelkamp T: +49-5772-293-100
F: +49-5772-293-333
https://www.mittwald.de Geschäftsführer: Robert Meyer St.Nr.: 331/5721/1033, USt-IdNr.: DE814773217, HRA 6640, AG Bad Oeynhausen Komplementärin: Robert Meyer Verwaltungs GmbH, HRB 13260, AG Bad Oeynhausen
Ok, to do a ifdown of virtual bridge it seems the only option.
Many thanks to all for your answers.
There’s a qemu monitor command for that. You can pass it in through virsh:
$ virsh qemu-monitor-command –hmp ‘set_link off’
Example:
# virsh list Id Name State
————————————————–
* Definitely look to Juerg Haefliger’s solution. It’s exactly what you want since you requested a method that can be done from the virsh interface. Thanks Juerg!
1) down the vnetX interface from the host node
ip link show dev vnetX
ip link set down vnetX
ip link show dev vnetX
And if using bridged networking, you have one more option. vnetX
2) remove the vnetX interface from the bridge
brctl delif
Certainly downing the interface using either Juerg’s solution via virsh or mine via iproute2 tools is most ideal since it’s easier/simpler to reinstate. You can use ifconfig if you prefer it over ip tools, but enjoy those tools and syntax while it remains! [0] ;-)
[0]
https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements/