I have created VPC and added Amazon RDS to it. Now I want to add ECS in this VPC and push my Docker container. My container is React web app and Flask server which I want to communicate with Amazon RDS. I have passed through a great deal of ECS documentation but still can’t do this. Any help or guidance will be great. Thanks!
It depends on how you create your ECS service. One way was already provided by @ThiagoDaAnunciação.
Other ways are (for FARGATE):
For EC2 launch type, you specify the VPC and subnets when you create your container instances.