webdatabase | IndexedDb , web database , IndexedDb class , 网页数据库封装类 , 网页缓存技术 | Storage library

Based on the comments.

Since you have circular dependency between your templates, the easiest solution would be to move the StorageBucket from resources.yml into core.yml, and then export it from there. This way in resources.yml you would import both PatheinWebServerSecurityGroup and StorageBucket.

The alternative is to move StorageBucket and PatheinWebServerSecurityGroup into third template, thus breaking the circular dependency.

Also note that you can't do:

You're referencing the logical id of the security groups (which is its name).

The parameters for both SourceSecurityGroupId and VPCSecurityGroups are expecting security group IDs instead.

To do this you would need to use the GroupId attribute of the security groups instead as shown in the below updated template.

Your SourceSecurityGroupId should be ID of the security group:

Edit

In addition the OP also have to rebuild stack as some resources were created in the wrong VPC and led to a race condition when updating the stack.

Original

I am getting the following error The DB instance and EC2 security group are in different VPCs. The DB instance is in vpc-bbda8cdf and the EC2 security group.

This is because your WebDatabase resource does not have an attached DB subnet group.

A AWS::RDS::DBSubnetGroup resource should be created containing 2 subnets (in different AZs) within the VPC.

Then in your RDS resource use the DBSubnetGroupName to specify the above resources name.

Below is an example template

You need to store files/images in aws s3 refer this https://www.npmjs.com/package/multer-s3