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I have an Amazon EC2 instance running and I will like to add another security group to that instance and then remove the current security group from that instance. Is this possible?

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Just to add a few more bits of information. We have two instances joint to two security groups. We want to separate this and dedicate a security group per instance. – Geo Jul 7 '09 at 15:25
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Amazon's FAQ says it's not possible to define a security group anywhere but at launch time.

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Thanks, I miss that question when I was browsing the FAQ. Thanks again. – Geo Jul 7 '09 at 15:46
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up vote 2 down vote
  1. Create an AMI image from the instance you want to move to a different security group.
  2. Launch a new instance using that image, now we can assign this new instance to a different security group.
  3. Discard the previous instance.

This requires downtime on your instance. There may be some other options available using the API.

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However according the this FAQ "modify the settings for the current security group - which will affect all instances running in the specific group" you can change gradually redefine the existing ones. As I'm trying this now for my scenario through the EC2 console, my records where all erased!

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