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How can add a security group to an instance using CLI?

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For default one, you can use the below commands:

aws ec2 modify-instance-attribute --instance-id i-123 --groups sg-1 sg-2 ..

And if the instance has more than one network interface, then use the below commands:

aws ec2 modify-network-interface-attribute --groups sg-1 sg-2 --network-interface-id eni-1

For more, you can read here.

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