How many network interfaces needed on controller/network node?

asked 2013-04-02 15:11:46 -0500

sasok gravatar image

updated 2013-04-04 15:00:43 -0500

I am setting up an OpenStack Folsom setup on two nodes. I am using Quantum for networking. First node controller/network and the second node compute. I would like the VMs to have access to external network with floating ips etc. The question is how do I configure the controller/network node and how many network interfaces I need. If I understand correctly I need one interface for management and one for VM data network (from compute node). Here comes the tricky part. Do I need two more interfaces - one for VM external net and one for OpenStack API/dashboard access or can these two functions be configured on the same network interface? If these two things can be configured on the same interface, how do I do this?

Thanks for your help.

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answered 2013-04-04 14:50:53 -0500

annegentle gravatar image

There's a discussion about Network Design in the Operations Guide on the OpenStack Docs site.

This may be relevant to your question, drawn from that page, "Consider creating other private networks for communication between internal components of OpenStack, such as the Message Queue and OpenStack Compute. VLANs are great for these scenarios."

You may need to do VLAN tagging to achieve the private networks for internal comms. You may need another NIC for public interfaces to APIs, Swift Proxy, and so on. Really depends on what you and your users need.

I'll also say the disclaimer "I just read/write docs and don't manage networks for a living."

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Thanks Anne. I failed to specify in my question above, that I am using Quantum for networking. Operations guide only focuses on nova-network, if I am not mistaken. Nevertheless, I will check the relevant sections.

sasok gravatar imagesasok ( 2013-04-04 14:59:04 -0500 )edit

answered 2013-04-13 22:11:22 -0500

Salvatore gravatar image

updated 2013-04-13 22:11:41 -0500

I do something network-y for a living, and I'd say that Anne's answer totally makes sense! If you more context please consider having a look at this resource too:

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Asked: 2013-04-02 15:11:46 -0500

Seen: 919 times

Last updated: Apr 13 '13