I can't delete my VPC
Most AWS apps that make use of the VPC, don't show its usage under VPC console. (update) Although AWS console say it will detach the resources, you need to check specific VPC resources used by other AWS services.
Here is some :
EC2 instances: Network interface , Security Groups and subnet for any EC2 instance attach to the VPC-subnets. You may choose to
- TERMINATE(delete) the EC2 instance, or
- Launch the instance into a "dummy VPC" or public subnet
RDS: DB Security Groups and subnet When create RDS and attach to VPC, you must create a DB Subnet group attach to that VPC. Even you delete the RDS, the DB subnet group(s) stay. So you need to go to the console and delete the DB subnet group(or use aws cli to remove it)
Any other AWS services that make use of VPC
- Just back track all the services that make use of VPC-id, VPC-Subnet-ID, Security Groups, etc.
(Updated after tested @TheOne pointed out VPC endpoint )
4. VPC endpoint
Things inside VPC that you don't need to worry about when delete VPC
- Virtual Private Gateways (the console will detach VPG from VPC )
- VPN Attachments
- Internet Gateways
- Route Tables
Before you can delete a VPC, you must terminate any instances that are running in the VPC. If you delete a VPC using the VPC console, it also deletes resources that are associated with the VPC, such as subnets, security groups, network ACLs, DHCP options sets, route tables, and Internet gateways.
So there is no request to manually delete security groups.
To terminate your instance, release your Elastic IP address, and delete your VPC
Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
In the navigation pane, choose Instances.
Select your instance, choose Actions, then Instance State, and then select Terminate.
In the dialog box, expand the Release attached Elastic IPs section, and select the check box next to the Elastic IP address. Choose Yes, Terminate.
Open the Amazon VPC console at https://console.aws.amazon.com/vpc/.
In the navigation pane, choose Your VPCs.
Select the VPC, choose Actions, and then choose Delete VPC.
When prompted for confirmation, choose Yes, Delete.
refer:
Clean Up VPC