While Amazon EFS mounts work flawlessly within AWS environments and Linux systems, OSX presents unique challenges due to differences in NFS protocol implementations. The key symptom is:

mount_nfs: can't mount / from 100.100.100.68 onto /sharedfiles: RPC prog. not avail

Amazon EFS uses NFSv4.1, while OSX's built-in NFS client has limitations:

• OSX defaults to older NFS versions (3 or 4.0)
• Missing required RPC services (mountd, nfsd)
• Incompatible with EFS's server-side locking mechanism

Option 1: Using NFS Client in Docker

This bypasses OSX's native NFS limitations by leveraging Linux containers:

# Start a Linux container with NFS support
docker run -it --privileged -v /sharedfiles:/mnt debian bash

# Inside container:
apt update && apt install -y nfs-common
mount -t nfs4 -o nfsvers=4.1 100.100.100.68:/ /mnt

Option 2: Third-Party NFS Clients

Commercial solutions like:

• MacFUSE + NFS plugin
• Dockerized NFS gateway
• Parallels Desktop Mounter

The HAProxy setup is correct, but needs OSX-specific adjustments:

listen efs-proxy
    bind :2049
    mode tcp
    option tcplog
    timeout client 1h
    timeout server 1h
    server efs-endpoint fs-1e7bb658.efs.us-east-1.amazonaws.com:2049

1. Verify VPN connectivity: ping 100.100.100.68
2. Check NFS port access: nc -zv 100.100.100.68 2049
3. Test with minimal permissions: mount -o resvport,nfsvers=4,tcp 100.100.100.68:/ /mnt

When bridging EFS to local machines:

• Restrict HAProxy access to VPN IP ranges
• Implement IAM policies for EFS access control
• Consider SSH tunneling as alternative

When attempting to mount Amazon EFS on macOS through an HAProxy tunnel, we first configured a Docker container running HAProxy to forward NFS traffic:

sudo docker run -d --net=host haproxy /bin/bash -c "echo -e 'listen fs-1e7bb658-us-east-1\n    bind :2049\n    mode tcp\n    option tcplog\n    timeout tunnel 300000\n    server fs-1e7bb658-us-east-1a us-east-1a.fs-1e7bb658.efs.us-east-1.amazonaws.com:2049 check inter 60000 fastinter 15000 downinter 5000' > /haproxy.cfg && haproxy -f /haproxy.cfg"

The tunnel works perfectly when mounting from Linux instances:

sudo mount 100.100.100.68:/ /testing
echo "testing123!" > /testing/testing.txt
cat /shared/testing.txt

However, macOS encounters protocol-level issues when attempting the mount:

sudo mount 100.100.100.68:/ /sharedfiles
mount_nfs: can't mount / from 100.100.100.68 onto /sharedfiles: RPC prog. not avail

Running rpcinfo reveals missing NFS services:

rpcinfo -p 100.100.100.68
# Shows only portmapper, status, and nlockmgr services

The NFSv4-specific mount command also fails on macOS:

mount -t nfs4 -o nfsvers=4.1 100.100.100.68:/ /sharedfiles
mount: exec /System/Library/Filesystems/nfs4.fs/Contents/Resources/mount_nfs4: No such file or directory

A functional workaround involves using Docker to create a Linux environment:

# Start a Debian container
docker run -it --rm debian bash

# Install NFS client inside container
apt-get update && apt-get install nfs-common -y

# Mount through HAProxy tunnel
mount -t nfs4 -o nfsvers=4.1 100.100.100.68:/ /mnt

For native macOS mounting, consider these approaches:

# Try different NFS versions
sudo mount -t nfs -o vers=3,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2 100.100.100.68:/ /sharedfiles

# Or use the newer mount_nfs utility
/usr/sbin/mount_nfs -o vers=3 100.100.100.68:/ /sharedfiles

Ensure your security groups allow both NFS traffic (port 2049) and RPC ports (111, plus ephemeral ports for mountd, nlockmgr, etc.) from your macOS client IP.