Connect to NFS over SSH tunnel (with systemd)

README.txt

1) On each of your servers, create a new user:

	useradd -m -s /bin/false autossh

2) On your NFS server, add the public key of your NFS client to the authorised keys file:

	su -s /bin/bash autossh
	ssh-keygen
	vim ~/.ssh/authorized_keys

3) Modify the systemd service below to your needs, and install it to your server

4) Enable and start the service :-)

backup-nfs-tunnel.service

[Unit]
Description=autossh tunnel to backup server
AssertPathExists=/mnt/nfs/backup-nfs1

[Service]
Type=simple
Restart=always

ExecStartPre=-/usr/sbin/pvesm add dir backup-nfs1 --path /mnt/nfs/backup-nfs1 --disable 1 --shared 1
ExecStartPre=/usr/sbin/pvesm set backup-nfs1 --disable 1
ExecStart=/bin/su -s /bin/sh autossh -c 'ssh -NT -o "ServerAliveInterval 60" -o "ServerAliveCountMax 3" -L localhost:2049:localhost:2049 -p2300 autossh@10.0.0.1'
ExecStartPost=/bin/sleep 2
ExecStartPost=/bin/mount -t nfs localhost:/mnt/storage /mnt/nfs/backup-nfs1
ExecStartPost=/usr/sbin/pvesm set backup-nfs1 --disable 0

ExecStop=-/usr/sbin/pvesm set backup-nfs1 --disable 1
ExecStop=-/bin/umount -f /mnt/nfs/backup-nfs1

[Install]
WantedBy=multi-user.target

gistfile1.sh

systemctl enable backup-nfs-tunnel
systemctl start backup-nfs-tunnel