Certifique-se de seguir a linha para / etc / fstab:
nfs-server:/ /mnt nfs4 _netdev,auto 0 0
Sobre o _netdev :
where the auto option mounts on startup and the _netdev option can be used by scripts to mount the filesystem when the network is available. Under NFSv3 (type nfs) the _netdev option will tell the system to wait to mount until the network is available. With a type of nfs4 this option is ignored, but can be used with mount -O _netdev in scripts later