Root file system on NFS

configname: CONFIG_ROOT_NFS

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>Root file system on NFS
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you want your system to mount its root file system via NFS,
choose Y here. This is common practice for managing systems
without local permanent storage. For details, read
<file:Documentation/admin-guide/nfs/nfsroot.rst>.

Most people say N here.