I created a sample flask application by following Corey Schafer videos available on youtube. I am able to run in local environment and its working fine. I want to deploy it in AWS ECS cluster with fargate option so that I don't have to manage EC2 instances. I was able to build a sample cluster and service using terraform. Below is the code(Application load balancer part is missing)

provider "aws" {
  region = "us-east-2"
}


resource "aws_ecs_cluster" "sample_cluster" {
  name = "sample_cluster"

  setting {
    name  = "containerInsights"
    value = "enabled"
  }
}

data "aws_iam_role" "ecs_task_execution_role" {
  name = "ecsTaskExecutionRole"
}

resource "aws_ecs_task_definition" "sample_cluster_task_definition" {
  container_definitions = file("templates/container_definition.json")
  family                = "sample_terraform_task_definition"
  cpu                   = 256
  memory                = 512
  execution_role_arn    = data.aws_iam_role.ecs_task_execution_role.arn
  network_mode          = "awsvpc"
  runtime_platform {
    operating_system_family = "LINUX"
    cpu_architecture        = "X86_64"
  }
  requires_compatibilities = ["FARGATE"]
}

data "aws_subnets" "private" {
  filter {
    name   = "vpc-id"
    values = ["vpc-ac6d734yrbfjd7ebc7"]
  }

}




resource "aws_ecs_service" "sample_service" {
  name            = "sample_ecs_service"
  cluster         = aws_ecs_cluster.sample_cluster.arn
  task_definition = aws_ecs_task_definition.sample_cluster_task_definition.arn
  launch_type     = "FARGATE"
  desired_count = 1
  network_configuration {
    subnets          = toset(data.aws_subnets.private.ids)
    security_groups = ["sg-0044394c6e4b485738762f7"]
    assign_public_ip = "true"
  }
  depends_on = [aws_ecs_task_definition.sample_cluster_task_definition,data.aws_subnets.private ,aws_ecs_cluster.sample_cluster]
}

I am struggling with how(if required) to configure a web server in AWS since local environment has a dev server which is not suitable for production environment. So my question is

1. For a webserver e.g. nginx will it be separate docker container or does AWS has any managed service which can be utilized as a web server. For instance I am using AWS RDS instead of a separate container for DB.
2. If a separate docker container is required will it be part of same task definition or different. Which one is recommended.

I just want to give deployment more like a actual production setup so in case if anyone has deployed flask application in aws ecs in production could you please help me out. Thank you

CodePudding user response：

Since you are asking about "best practice" then it is generally considered best practice to run Nginx in front of Flask. To accomplish this on ECS/Fargate you would run two containers in the same ECS task (define them both in the same task definition). You would configure Nginx to proxy to Flask at 127.0.0.1:5000 (or whatever port you have Flask using), since multiple containers in the same task share 127.0.0.1 in Fargate.