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Hello.
ECS itself does not need to be placed directly in a public subnet.
Since API Gateway will be added later, I think it is best to configure it so that it can be accessed via ALB.
You can access ECR using a VPC endpoint, but I think the setup is complicated for beginners, so I think it's best to set it up using a NAT Gateway first.
The configuration will be as follows.
Reference documents are below.
https://repost.aws/knowledge-center/ecs-fargate-tasks-private-subnet
https://repost.aws/knowledge-center/ecs-fargate-task-database-connection
First, set up a network such as VPC.
Although it is a little old, I think the following video will be helpful.
https://www.youtube.com/watch?v=43tIX7901Gs
Make sure "enableDnsHostnames" and "enableDnsSupport" are enabled after creating the VPC.
If this is not enabled, access to ECR and RDS will fail.
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-dns.html#vpc-dns-support
Next, create an ALB.
I think the following blog will be helpful when creating an ALB.
https://sakyasumedh.medium.com/setup-application-load-balancer-and-point-to-ecs-deploy-to-aws-ecs-fargate-with-load-balancer-4b5f6785e8f
Next, create RDS.
I think the following blog will be helpful for creating RDS.
https://sakyasumedh.medium.com/deploy-backend-application-to-aws-ecs-with-application-load-balancer-step-by-step-guide-part-1-91935ae93c51
Next, create ECR and ECS.
I think the following blog will be helpful for setting up ECR and ECS.
https://sakyasumedh.medium.com/deploy-backend-application-to-aws-ecs-with-application-load-balancer-step-by-step-guide-part-2-e81d4daf0a55
https://sakyasumedh.medium.com/deploy-backend-application-to-aws-ecs-with-application-load-balancer-step-by-step-guide-part-3-b8125ca27177
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Hi we have an existing ECS in Public Subnet and must not be moved to private subnet for now. Is this resolution still possible? Currently I have setup and EC2 as bastion host so I could connect to the Private RDS via SSH. The only thing left is how can I connect the app directly to the private RDS. Thank you for your help!
Even if ECS is deployed in a public subnet, you can connect if you configure the RDS security group's inbound rules to allow the ECS security group. https://docs.aws.amazon.com/vpc/latest/userguide/security-group-rules.html#security-group-referencing
Specifically, you can connect by setting the following rules in the RDS security group.