Attach Volume EFS in ECS

Question

When trying to mount an EFS file system together with ECS, I get the following error:

ResourceInitializationError: failed to invoke EFS utils commands to set up EFS volumes: stderr: mount.nfs4: Connection reset by peer : unsuccessful EFS utils command execution; code: 32

My Stack:

--- 
  AWSTemplateFormatVersion: "2010-09-09"
  Description: "Template Test"
  Outputs: 
    FileSystemID: 
      Description: "File system ID"
      Value: 
        Ref: FileSystem
  Parameters: 
    VolumeName: 
      Default: myEFSvolume
      Description: "The name to be used for the EFS volume"
      MinLength: "1"
      Type: String
  Resources: 
    ECSCluster: 
      Properties: 
        ClusterName: jenkins-cluster
      Type: "AWS::ECS::Cluster"
    EFSMountTarget1: 
      Properties: 
        FileSystemId: 
          Ref: FileSystem
        SecurityGroups: 
          - "sg-0082cea75ba714505"
        SubnetId: "subnet-0f0b0d3aaada62b6c"
      Type: "AWS::EFS::MountTarget"
    FileSystem: 
      Properties: 
        Encrypted: true
        FileSystemTags: 
          - Key: Name
            Value: 
              Ref: VolumeName
        PerformanceMode: generalPurpose
      Type: "AWS::EFS::FileSystem"
    JenkinsService: 
      Type: "AWS::ECS::Service"
      Properties: 
        Cluster: 
          Ref: ECSCluster
        DesiredCount: 2
        LaunchType: FARGATE
        NetworkConfiguration: 
          AwsvpcConfiguration:
            AssignPublicIp: ENABLED
            SecurityGroups: 
              - "sg-0082cea75ba714505"
            Subnets: 
              - "subnet-0f0b0d3aaada62b6c"
        PlatformVersion: "1.4.0"
        ServiceName: JenkinsService
        
        TaskDefinition: 
          Ref: JenkinsTaskDef
    JenkinsTaskDef: 
      Type: "AWS::ECS::TaskDefinition"
      Properties:
        Cpu: 2048
        Memory: 4096
        Family: efs-example-task-fargate
        NetworkMode: awsvpc
        TaskRoleArn: "arn:xxxxx/ecs"
        ExecutionRoleArn: "arn:xxxxxx:role/ecs"
        RequiresCompatibilities:
          - FARGATE 
        ContainerDefinitions: 
          - Cpu: 1024
            Memory: 2048
            PortMappings:
              - HostPort: 8080
                ContainerPort: 8080
              - HostPort: 50000
                ContainerPort: 50000
            image: "xxxxxxx.dkr.ecr.us-east-1.amazonaws.com/sample:latest"
            mountPoints: 
              - containerPath: /var/jenkins_home
                readOnly: false
                sourceVolume: myEfsVolume
            name: jenkins
        volumes:
          - name: myEfsVolume  
            efsVolumeConfiguration: 
              fileSystemId: 
                Ref: FileSystem
              rootDirectory: /var/jenkins_home
              transitEncryption: ENABLED 
    

I am performing according to documentation:

https://docs.aws.amazon.com/AmazonECS/latest/APIReference/API_EFSVolumeConfiguration.html

Answer 1

You need to open port 2049 inbound on the security group on the network interface and task definition. It was not automatically set up even though If you set it to create the security group for you.

Answer 2

It's been a while now but I've had the same issue and it was a bit confusing to understand how to proceed. When you create your EFS Volume, you choose a VPC and one Security Group to each Subnet.

You need to go to edit this Security Group to add an Inbound rule of type NFS to allow access (tcp port 2049) to the Security Group Identifier of your ECS cluster service that you want to allow access to. For that, just select Custom in the source field and type service's Security Group identifier on the text box.

For more information this article describes the whole process very well.