Differences

This shows you the differences between two versions of the page.

--- aws:vpc [27/01/2022 11:33] – created - external edit 127.0.0.1
+++ aws:vpc [31/07/2025 13:08] (current) – andrew
@@ Line 1: / Line 1: @@
 ====== Virtual Private Cloud (VPC) ======
+FIXME intro blurb on VPC, AZ, subnets, IG / NAT gateway
+{{aws:st-setip_iot.png?300 |VPC with two AZ and subnets}}
 ===== Show unused Security Groups =====
@@ Line 19: / Line 24: @@
 rm security_groups.txt
 </code>
+===== Get subnets in VPC =====
+<code>
+$ aws ec2 describe-subnets | jq .Subnets.[].SubnetId
+"subnet-1234abcdab7899876"
+"subnet-12341bcd207959876"
+</code>
+===== IPv4 Regex =====
+This works in Cloudformation to tempate the allowed digits in and IPv4 address. Not exhaustively tested.
+<code>
+"^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\\/(22))$"
+</code>
+CF Template example:-
+<code yaml>
+  "Parameters": {
+    "VPCCIDR": {
+      "AllowedPattern": "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\\/(22))$",
+      "ConstraintDescription": "CIDR block parameter must be in the form x.x.x.x/22",
+      "Default": "192.168.192.0/22",
+      "Description": "CIDR block for VPC",
+      "Type": "String"
+    }
+</code>
+This may bea better example:- [[https://ihateregex.io/expr/ip/]]
+===== IPv6 Regex =====
+FIXME