trusty	server	release	20190321	ebs	amd64	ap-east-1	ami-d91961a8			hvm
trusty	server	release	20190321	ebs-io1	amd64	ap-east-1	ami-8c1961fd			hvm
trusty	server	release	20190321	ebs-ssd	amd64	ap-east-1	ami-78215909			hvm