Hi guys Which NFS daemons are found on the NFS server?

hey,

General NFS daemons

The nfs-utils package

NFS is implemented as a set of daemons. These can be recognized by their name: they all start with the rpc. prefix followed by the name of the daemon. Among these are: rpc.nfsd (only a support program in systems with a kernel NFS server), rpc.mountd, rpc.lockd and rpc.statd.

The source for these daemons can be found in the nfs-utils package (see [NFS] for more information on nfs-utils). It will also contain the source of other support programs, such as exportfs, showmount and nfsstat. These will be discussed later in the section called “Exporting filesystems” and the section called “Testing NFS”.

Distributions may provide nfs-utils as a ready-to-use package, sometimes under different names. Debian, for example, provides lock and status daemons in a special nfs-common package, and the NFS and mount daemons in nfs-*server packages (which come in user-space and kernel-space versions).

Each of the daemons mentioned here can also be secured using the tcp wrapper. Details in the section called “Securing NFS”.
NFS server software

The NFS daemon

When implementing an NFS server, you can install support for an kernel-space or an user-space NFS server, depending on the kernel configuration. The rpc.nfsd command (sometimes called nfsd) is the complete NFS server in user space. I kernel space, however, it is just a support program that can start the NFS server in the kernel.

A kernel-space or a user-space NFS server

The kernel-space NFS server

The kernel-space NFS server is part of the running kernel. A kernel NFS server appears as [nfsd] in the process list.

The version of rpc.nfsd that supports the NFS server inside the kernel is just a support program to control NFS kernel server(s).

The user-space NFS daemon

The rpc.nfsd program can also contain an old-fashioned user-space NFS server (version 2 only). A user-space NFS server is a complete NFS server. It can be recognized as rpc.nfsd in the process list.

The mount daemon

The mountd (or rpc.mountd) mount-daemon handles incoming NFS (mount) requests. It is required on a system that provides NFS server support.

The configuration of the mount daemon includes exporting (making available) a filesystem to certain hosts and specifying how they can use this filesystem.

Exporting filesystems, using the /etc/exports file and the exportfs command will be discussed in the section called “Exporting filesystems”.

The lock daemon

A lock daemon for NFS is implemented in rpc.lockd.

You won't need lock-daemon support when using modern (2.4.x) kernels. These kernels provide one internally, which can be recognized as [lockd] in the process list. Since the internal kernel lock-daemon takes precedence, starting rpc.lockd accidentally will do no harm.

There is no configuration for rpc.lockd.

The status daemon

According to the manual page, status daemon rpc.statd implements only a reboot notification service. It is a user-space daemon - even on systems with NFS version 3 support. It can be recognized as rpc.statd in the process listing. It is used on systems with NFS client and NFS server support.

There is no configuration for rpc.statd.

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Venkat
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