I have been having an issue getting an NFS share to automatically mount on boot for a handful of rpi4's all running Ubuntu 20.04.2 LTS.
If I run a sudo mount -a the drive successfully mounts with no issues.
I have tried a variety of fstab options with no success. Below is the current config:
192.168.1.100:/mnt/media /mnt/media nfs _netdev,auto,nfsvers=4 0 0
Running sudo cat /var/log/syslog | grep nfs returns the following:
Jun 24 18:59:01 test-01 kernel: [ 7.865019] Installing knfsd(copyright (C) 1996 okir@monad.swb.de).
Jun 24 18:59:01 test-01 systemd[1]: nfs-config.service:Succeeded.
Jun 24 18:59:03 test-01 kernel: [ 18.820306] FS-Cache: Netfs'nfs' registered for caching
Jun 24 18:59:03 test-01 mount[1754]: mount.nfs: Network isunreachable
I am not sure if it is trying to mount before the network is online, but i thought the _netdev option prevented this.