Using AWS EFS with Docker

I am using the new Elastic File System provided by amazon, on my single container EB deploy. I can't figure out why the mounted EFS cannot be mapped into the container.

The EFS mount is successfully performed on the host at /efs-mount-point.

Provided to the Dockerrun.aws.json is

{
  "AWSEBDockerrunVersion": "1"
  "Volumes": [
    {
      "HostDirectory": "/efs-mount-point",
      "ContainerDirectory": "/efs-mount-point"
    }
  ]
}

The volume is then created in the container once it starts running. However it has mapped the hosts directory /efs-mount-point, not the actual EFS mount point. I can't figure out how to get Docker to map in the EFS volume mounted at /efs-mount-point instead of the host's directory.

Do NFS volumes play nice with Docker?

Solution

You need to restart docker after mounting the EFS volume in the host EC2 instance.

Here's an example, .ebextensions/efs.config:

commands:
   01mkdir:
      command: "mkdir -p /efs-mount-point"
   02mount:
      command: "mountpoint -q /efs-mount-point || mount -t nfs4 -o nfsvers=4.1 $(curl -s http://169.254.169.254/latest/meta-data/placement/availability-zone).fs-fa35c253.efs.us-west-2.amazonaws.com:/ /efs-mount-point"
   03restart:
      command: "service docker restart"