Pulling docker image from ECR using task definition

Question

Hi, Im trying to setup my web app manually because I dont want to dive straight into Infrastructure as code or tools, if possible I want to know and play around with the AWS components.  
  
I have this EC2:

And put it inside my ECS cluster:  
    
I have this postgresql RDS:  
    
This is the security group I set up for ec2 to connect to rds:  
    
I have set up a task definition to pull docker image from my ECR:

I have run the task definition on my cluster but it always fail at the step to connect to the RDS database:

I have telnet and psql to that address from EC2 terminal and it is successful. Why am I not able to run docker image from task definition? I think it pulled from ECR correctly but when running the docker image, it is not able to connect to the db. Thanks  
  
Update: I changed network setting of the task to awsvpc instead of bridge, and set it to security group of my EC2. It keeps running with no logs. I dont know what is happening, whether the web app is deployed or not.

Answer

Turns out I look at the wrong ec2

Pulling docker image from ECR using task definition

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