NFS(Network File System) is quite common protocol and still in demand, though even if Cluster File System is in popular and becomes familiar with every engineer. For example, it is sometimes necessary to use NFS, when replacing an old and on-premise system composed with NFS server and clients. I've been using NFS v3, but I will try v4 as it use static tcp 2049 port by default, which enables iptables less directives than that of v3.
I'll list how to setup NFS both v3 and v4, and also how to monitor both of them with nagios.
