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NFS uses RPC technology, which makes it easy for systems to make requests for remote execution of procedures on server systems. RPC is currently supported across a number of different operating systems, including Solaris, Linux, and Microsoft Windows. The purpose of RPC is to abstract the connection details and methods required to access
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NFS server carolina exports its mail directory to NFS clients georgia, fairfax, and virginia, using the same mount point as the exported file system.
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NFS server carolina exports its mail directory to NFS clients georgia, fairfax, and virginia, using their own mount points.
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procedures across networks that is, the client and server programs do not need to implement separate networking code, as a simple API is provided for finding services through a service called the portmapper (or rpcbind). The portmapper should be running on both the client and server for NFS to operate correctly. The portmapper is registered with both UDP and TCP 111, since requests may be generated for or received using NFS 2 or NFS 3, respectively.
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The automounter is a program that automatically mounts NFS file systems when they are accessed and then unmounts them when they are no longer needed. It allows you to use special files, known as automounter maps, that contain information about the servers, the pathname to the NFS file system on the server, the local pathname, and the mount options. By using the automounter, you don t have to manually update the entries in /etc/vfstab on every client every time you make a change to the NFS servers. Normally, only root can mount file systems, so when users need to mount an NFS file system, they need to find the system administrator. The main problem is that once users are finished with a file system, they rarely tell the system administrator even if they were to do so, manually mounting and unmounting resources at the request of users would create an administrative burden that is not scalable. In addition, if the NFS server containing that file system ever crashed, you may be left with one or more hanging processes. This can easily increase your workload if you are responsible for maintaining an NFS server. The automounter can solve both of these problems, because it automatically mounts an NFS file system when a user references a file in that file system, and it will automatically unmount the NFS file system if it is not referenced for more than five minutes. The automounter is an RPC daemon that services requests from clients to mount and unmount remote volumes using NFS. During installation, a set of server-side maps are created that list the file systems to be automatically mounted. Typically, these file systems include shared user home directories (under /home) and network-wide mail directories (/var/mail).
Part VI:
Services, Directories, and Applications
Procedures
The following procedures are commonly used for installing and managing NFS.
Configuring an NFS Server
If you installed the NFS server during installation of the operating system, a startup script called nfs.server has been created in /etc/init.d. Normally, NFS is started at run-level 3. However, the NFS server can be started manually by typing the command
# /etc/init.d/nfs.server start
This command will start at least two daemons: the NFS server nfsd daemon (/usr/lib/ nfs/nfsd) and the mount daemon (/usr/lib/nfs/mountd). The nfsd daemon is responsible for answering access requests from clients for shared volumes on the server, while the mountd daemon is responsible for providing information about mounted file systems. To check whether or not the NFS server has started correctly, it is possible to examine the process list for nfsd and mountd by using the following commands:
# ps -eaf | grep nfsd root 19961 1 0 # ps -eaf | grep mountd root 370 1 0
Aug 31 May 16
0:09 /usr/lib/nfs/nfsd -a 16 2:49 /usr/lib/nfs/mountd
In this case, both nfsd and mountd are operating correctly. To stop the NFS server, you use the following command:
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