Mounting an elastic file system to AWS Batch Computer Enviroment - amazon-web-services

Question

I'm trying to get my elastic file system (EFS) to be mounted in my docker container so it can be used with AWS batch. Here is what I did:
Create a new AMI that is optimized for Elastic Container Services (ECS). I followed this guide here to make sure it had ECS on it. I also put the mount into /etc/fstab file and verified that my EFS was being mounted (/mnt/efs) after reboot.
Tested an EC2 instance with my new AMI and verified I could pull the docker container and pass it my mount point via
docker run --volume /mnt/efs:/home/efs -it mycontainer:latest
Interactively running the docker image shows me my data inside efs
Set up a new compute enviorment with my new AMI that mounts EFS on boot.
Create a JOB definition File:
{
"jobDefinitionName": "MyJobDEF",
"jobDefinitionArn": "arn:aws:batch:us-west-2:#######:job-definition/Submit:8",
"revision": 8,
"status": "ACTIVE",
"type": "container",
"parameters": {},
"retryStrategy": {
"attempts": 1
},
"containerProperties": {
"image": "########.ecr.us-west-2.amazonaws.com/mycontainer",
"vcpus": 1,
"memory": 100,
"command": [
"ls",
"/home/efs",
],
"volumes": [
{
"host": {
"sourcePath": "/mnt/efs"
},
"name": "EFS"
}
],
"environment": [],
"mountPoints": [
{
"containerPath": "/home/efs",
"readOnly": false,
"sourceVolume": "EFS"
}
],
"ulimits": []
}
}
Run Job, view log
Anyway, while it does not say "no file /home/efs found" it does not list anything in my EFS which is populated, which I'm inerpreting as the container mounting an empty efs. What am I doing wrong? Is my AMI not mounting the EFS in the compute environment?

Answer 1

I covered this in a recent blog post
https://medium.com/arupcitymodelling/lab-note-002-efs-as-a-persistence-layer-for-aws-batch-fcc3d3aabe90
You need to set up a launch template for your batch instances, and you need to make sure that your subnets/security groups are configured properly.