about ready to try it

cdk/sfec2/sci_stack.py

@@ -11,13 +11,14 @@ class SciInstancesStack(cdk.Stack):
         super().__init__(vpcStack, construct_id, env=env, **kwargs)
 
         thisVpc  = vpcStack.vpc
+        imageId = ec2.LookupMachineImage(name='debian-11-amd64-20221219-1234', windows=False)
         ec2instance = ec2.Instance(self, f"i-{thing}",
             vpc=vpcStack.vpc,
             instance_type=ec2.InstanceType("t2.nano"),
-            machine_image=ec2.AmazonLinuxImage(),
+            machine_image=imageId,
             block_devices=[ec2.BlockDevice(
                 device_name="/dev/sda1",
-                volume=ec2.BlockDeviceVolume.ebs(50),
+                volume=ec2.BlockDeviceVolume.ebs(6),
                 )
             ],
             security_group = vpcStack.SciSG,
@@ -29,18 +30,13 @@ class VpcBasisStack(cdk.Stack):
         super().__init__(scope, construct_id, **kwargs)
 
         self.vpc = ec2.Vpc(self, 'out-vpc',
-            cidr = "172.17.0.0/18",
-            max_azs = 3,
+            ip_addresses=ec2.IpAddresses.cidr('172.19.19.0/24'),
+            max_azs = 1,
             subnet_configuration=[
                 ec2.SubnetConfiguration(
                     name = 'pub',
                     subnet_type = ec2.SubnetType.PUBLIC,
                     cidr_mask = 26
-                ),
-                ec2.SubnetConfiguration(
-                    name = 'pri',
-                    subnet_type = ec2.SubnetType.PRIVATE_WITH_NAT,
-                    cidr_mask = 20
                 )
             ],
             nat_gateways = 3