NFS マウントタイムアウトをトラブルシューティングする方法

Issue

• NFS 共有をマウントしようとすると、接続がタイムアウトになります。以下はその例です。

[coolexample@miku ~]$ sudo mount -v -o tcp -t nfs megpoidserver:/mnt/gumi /home/gumi
mount.nfs: timeout set for Sat Sep 09 09:09:08 2019
mount.nfs: trying text-based options 'tcp,vers=4,addr=192.168.91.101,clientaddr=192.168.91.39'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'tcp,addr=192.168.91.101'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.91.101 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=6
mount.nfs: trying 192.168.91.101 prog 100005 vers 3 prot TCP port 896
mount.nfs: portmap query failed: RPC: Timed out
mount.nfs: mount to NFS server 'megpoidserver:/mnt/gumi' failed: timed out, giving up