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Add interface to currently running instance

asked 2013-10-10 15:42:08 -0500

Snowball gravatar image

updated 2013-10-10 15:44:45 -0500

I have 2 networks, net1 and net2. I have an instance named test-fedora that is on the net1 network. Is there a way to add the pre-existing test-fedora instance to the net2 network?

I didn't see anything in the dashboard interface, so I tried

PORT_ID=$(quantum port-create net2 | grep ' id ' | awk '{print $4}')
nova interface-attach --port-id $PORT_ID test-fedora

After doing this, the "Network Topology" page on the dashboard showed test-fedora as being connected to both networks, but when I log into test-fedora and issue ip link, I only see the the interface on net1. I tried rebooting the instance, but the interface still doesn't show up.

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Did you configure the network for the second interface by adding one file /etc/sysconfig/network-scripts/ifcfg-eth1? I add this file for eth1, then reboot the VM. The interface can show up.

Euler gravatar imageEuler ( 2013-12-01 00:59:21 -0500 )edit

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answered 2013-10-11 13:50:35 -0500

sebaridolfi gravatar image

updated 2013-10-11 13:51:47 -0500

what I did to be able to add more than one IP to an instance is this: First, you need to edit this file on every compute node:

/etc/libvirt/nwfilter/nova-base.xml

To be like this:

<filter chain="root" name="nova-base"> <uuid>36cfc520-284c-ecbe-2804-fb8c999d3dea</uuid> </filter>

Then, restart ebtables and libvirt-bin

/etc/init.d/libvirt-bin restart /etc/init.d/ebtables restart

What this does is to disable ebtables of openstack, and allows you to add more than one IP to an instance using a virtual interface (such as eth0:1)

Remember to kill all dhclient services in order to nova does not bring down your new interfaces.

Maybe this will work for you as it is working for me.

I use OpenStack folsom version and nova-networks

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Asked: 2013-10-10 15:42:08 -0500

Seen: 6,084 times

Last updated: Oct 11 '13