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 sudo mount -t efs -o tls fs-0d91516aefa123a08:/ efs/
mount: /home/ubuntu/efs: unknown filesystem type 'efs'.
       dmesg(1) may have more information after failed mount system call.
root@ip-10-34-73-184:/home/ubuntu# sudo mount -t nfs4 -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport fs-0d91516aefa123a08.efs.ap-southeast-1.amazonaws.com:/ efs
mount: /home/ubuntu/efs: bad option; for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount.<type> helper program.
       dmesg(1) may have more information after failed mount system call.