aws cli describe-instances without a VpcId

Question

I want to run aws ec2 describe-instances looking for any instances without a VpcId property (those in ec2-classic)

How can I return ec2-classic instances using either the --query flag or JMESPath expression to get results without a VpcId?

Answer 1

This cli command will list all the instances which doesn't have VpcId.

aws ec2 describe-instances --region us-east-1 --query 'Reservations[*].Instances[?!not_null(VpcId)] | [].[InstanceId]'  --output text

You can tweak the same to list all instances which has VpcId.

aws ec2 describe-instances --region us-east-1 --query 'Reservations[*].Instances[?not_null(VpcId)] | [].[InstanceId]'  --output text