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How to set Floating IP as Instance primary IP ?

asked 2018-04-09 07:41:35 -0500

Shahid gravatar image

Hi all,

After creating an instance in Openstack I found that only the private IP configuration is present inside the Instance. Is there a way through which we can get Public IP configuration as an interface and our floating IP would be used as a primary network interface in the Instance through.

Please let me know if it is possible!!!

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answered 2018-04-09 08:48:31 -0500

You can get the floating IP from the instance’s metadata. See this Stackoverflow question or the metadata service page in the OpenStack documentation.

If I understand you right, you want to add the floating IP to the instance’s network interface. If so, I don’t know what you want to achieve with this. The purpose of the floating IP is instance accessibility from outside the cloud using DNAT; no need to change the configuration inside the instance. If you plan to replace the instance’s address with the floating IP, you will get the opposite result: The instance won’t be accessible via the network without its static IP.

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yaa, that's what I wanted, I want that my Floating IP should be visible inside the Instance. If meta_data is the way to do it. Please tell me the procedure how to do it ? @Bernd Bausch

Shahid gravatar imageShahid ( 2018-04-09 09:51:16 -0500 )edit

Check the two links in my answer. Metadata is at http://169.254.169.254. Use the ec2data tool, which you may have to install on your instance, or curl, which is usually installed already.

Bernd Bausch gravatar imageBernd Bausch ( 2018-04-09 16:24:42 -0500 )edit

Thanks a ton @Bernd Bausch was able to see the IP by the following curl request

curl http://169.254.169.254/latest/meta-data/public-ipv4

Shahid gravatar imageShahid ( 2018-04-10 08:40:17 -0500 )edit

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Asked: 2018-04-09 07:41:35 -0500

Seen: 57 times

Last updated: Apr 09 '18