Deploying a docker image on ECS using FARGATE instance

Question

We have created CloudFormation template to deploy the docker image which we pushed to ECR private repo. But while creating the stack, after uploading template it;s throwing an error saying : Template format error: Unresolved resource dependencies [TargetGroup, Listener] in the Resources block of the template. Can you please check my template and provide me the solution.

AWSTemplateFormatVersion: 2010-09-09
Description: CloudFormation template for deploying an app using Fargate with EBS storage.

Parameters:
  VPC:
    Type: AWS::EC2::VPC::Id
    # Default: vpc-0e7fa5b1456919151
    Default: vpc-017326a9bde693167
  SubnetA:
    Type: AWS::EC2::Subnet::Id
    # Default: subnet-0468bc81339a8e324
    Default: subnet-0a5b2db7ade0b984c
  SubnetB:
    Type: AWS::EC2::Subnet::Id
    Default: subnet-03768793cf205ee4d
  SecurityGroup:
    Type: AWS::EC2::SecurityGroup::Id
    Default: sg-0f847124ae6322c82
  Image:
    Type: String
    Default: public.ecr.aws/x2k3c8w4/munlq:v1
  ServiceName:
    Type: String
    Default: MyService
  ContainerPort:
    Type: Number
    Default: 8080

Resources:
  Cluster:
    Type: AWS::ECS::Cluster
    Properties:
      ClusterName: !Join ['', [!Ref ServiceName, Cluster]]

TaskDefinition:
    Type: AWS::ECS::TaskDefinition
    Properties:
      NetworkMode: awsvpc
      RequiresCompatibilities:
        - FARGATE
      Cpu: '4096'
      Memory: '16384'

ExecutionRoleArn: !GetAtt ExecutionRole.Arn
      TaskRoleArn: !GetAtt TaskRole.Arn
      ContainerDefinitions:
        - Name: !Ref ServiceName
          Image: !Ref Image
          PortMappings:
            - ContainerPort: !Ref ContainerPort
          Essential: true
      EphemeralStorage:
        SizeInGiB: 150

ExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Join ['', [!Ref ServiceName, ExecutionRole]]
      AssumeRolePolicyDocument:
        Statement:
          - Effect: Allow
            Principal:
              Service: ecs-tasks.amazonaws.com
            Action: 'sts:AssumeRole'
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy'

TaskRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Join ['', [!Ref ServiceName, TaskRole]]
      AssumeRolePolicyDocument:
        Statement:
          - Effect: Allow
            Principal:
              Service: ecs-tasks.amazonaws.com
            Action: 'sts:AssumeRole'
  
  FargateService: 
    Type: AWS::ECS::Service 
    DependsOn: Listener
    Properties: 
      Cluster: !Ref Cluster 
      LaunchType: FARGATE 
      LoadBalancers:
        - TargetGroupArn: !Ref TargetGroup
          ContainerPort: 8080
          ContainerName: test
      ServiceName: munlq-service 
      DesiredCount: 1 
      TaskDefinition: !Ref TaskDefinition 
      NetworkConfiguration: 
        AwsvpcConfiguration: 
          AssignPublicIp: ENABLED 
          SecurityGroups: 
            - !Ref SecurityGroup 
          Subnets: 
            - !Ref SubnetA 
            - !Ref SubnetB 
      DeploymentConfiguration: 
        MaximumPercent: 200 
        MinimumHealthyPercent: 100 
        DeploymentCircuitBreaker: 
          Enable: true 
          Rollback: true

Accepted Answer

Hello
Only a part of your template is showing up properly and with YAML indentation is a bit of a pain when not copy-pasted properly.
If you are just starting with AWS ECS & CloudFormation, you should try [ECS Compose-X](https://github.com/compose-x/ecs_composex) which will take care of creating all your CFN templates for you from the docker compose definition, allowing you to add other things such as the LoadBalancer, the VPC (or use the existing one) etc.
You could also see about ECS CLI v2

But here, the error about missing [TargetGroup, Listener] means that these two things are neither a Parameter nor a resource in the template and are "missing".

Deploying a docker image on ECS using FARGATE instance

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