Fargate EFS Issue: ResourceInitializationError: failed to invoke EFS utils

Question

I have spent a number of hours working to setup EFS under ECS Fargate using the instructions in this post https://aws.amazon.com/blogs/aws/amazon-ecs-supports-efs/ and checked my JSON against the configure list https://docs.amazonaws.cn/en_us/AmazonECS/latest/developerguide/efs-volumes.html without success. I have deleted the recreated the cluster, EFS instance, VPC and security groups without success. I also tried adding an IAM role which didn't help. Not sure what to do next.  
  
My current error is "ResourceInitializationError: failed to invoke EFS utils commands to set up EFS volumes: command failed with 32: failed to execute command to invoke EFS utils: mount.nfs4: Connection reset by peer" when I try to start the Service with the EFS Task Definition enabled. As I understand it, Fargate should initiate these calls in a wrapper around the service, so I don't need to create a custom container image that includes the EFS Utils. Let me know if that isn't the case.  
  
Any suggestions on what the issue could be or things to test?

Answer

I am new to ECS and Fargate, so I am probably missing something simple.  
  
My task shows the error message in the OP. The inbound rule for the security group associated with the EFS device says:  
NFS,TCP,2049,.   
I think that's correct.  
  
I checked the Networking details for that EFS. It lists a Mount Target ID, Subnet ID, it's Available, and has an ENI and SG. How can I ensure that the network is "able to connect to the EFS"?

Answer

For anyone who still facing this error.  
Ensure the following configurations:   
- Security group: add an inbound rule to with type NFS and port 2049  
- Subnet: Ensure your network is able to connect to your EFS. you could check detail in EFS's networking

Answer

Turns out you needed to open port 2049 inbound on the security group on the network interface and task definition. It was not automatically setup even though I had it create the security group for me.

Answer

Thanks for the problem and the solution. I was trying to figure it out for last 2 days.   
  
-Chendil

Fargate EFS Issue: ResourceInitializationError: failed to invoke EFS utils

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