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Get the instance ID from hostname

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Get the AWS instance id from the hostname we specify. It is a lot easier to do operations with the instance ID for all the aws CLI commands.

cmd = f'aws ec2 describe-instances --filters "Name=tag:Name,Values={hostname}" --query "Reservations[].Instances[].InstanceId" --output text' op = _exe(None, cmd) instance_id = op.strip() print(instance_id)
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