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Why are two NICs required for OpenStack single node installation? [closed]

asked 2014-08-21 04:48:53 -0500

fhussain gravatar image


I have seen it in various tutorials on Openstack installation (e.g. [] that the machine on which OpenStack is to be installed should have two physical NICs.

I need to know why is that a requirement? Is it is a strict requirement or there are some alternatives?


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Closed for the following reason the question is answered, right answer was accepted by SGPJ
close date 2014-08-22 03:05:53.345643

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answered 2014-08-21 05:16:55 -0500

SGPJ gravatar image

Yes, it will be better. One will be used for management and other will be used for data network. For multinode setup 3 NICs the third one for neutron (if neutron server in running on separate node).

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SGPJ gravatar imageSGPJ ( 2014-08-21 05:18:58 -0500 )edit

As far as I understand, management network is used for establishing connectivity between OpenStack nodes in case of multi-node installation. What is a management network used for in case of single-node installation of OpenStack?

fhussain gravatar imagefhussain ( 2014-08-21 05:42:49 -0500 )edit

Public Network: (br-ex can be eth0)

This network is used by communication between VM and the external network, and client access to VM via Floating IP.

Private Network: (br-int can be eth1)

This network is used by communication between SDN or neutron service and OVS, each OpenStack components.

SGPJ gravatar imageSGPJ ( 2014-08-21 05:56:38 -0500 )edit

In my experience, you can still have one NIC for single node setup but it will be difficult for connecting the VMs from internet. If you don't want your VMs running on openstack to get connected from outside then you can go with 1 NIC. But it not a best practice.

SGPJ gravatar imageSGPJ ( 2014-08-21 06:10:37 -0500 )edit

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Asked: 2014-08-21 04:48:53 -0500

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Last updated: Aug 21 '14