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Running the rpcinfo command again to view the status of RPC programs registered with the portmapper shows this output:
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[root@serverA ~]# rpcinfo -p program vers proto port service 100000 4 tcp 111 portmapper 100011 2 tcp 738 rquotad <OUTPUT TRUNCATED> 100003 4 tcp 2049 nfs 100005 1 udp 32892 mountd
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This output shows that various RPC programs (mountd, nfs, rquotad, etc) are now running To stop NFS without having to shut down, enter this command:
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[root@serverA ~]# service nfs stop
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In order to have the NFS service automatically start up with the system with the next reboot, use the chkconfig command First check the runlevels for which it is currently configured to start by typing
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[root@serverA ~]# chkconfig --list nfs nfs 0:off 1:off 2:off 3:off 4:off 5:off 6:off
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The service is disabled by default on a Fedora system; enable it to start up automatically by typing
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[root@serverA ~]# chkconfig nfs on
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ENABLING NFS IN UBUNTU
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Ubuntu and other Debian-like distributions still rely on portmap instead of rpcbind used in the Fedora distro Installing and enabling an NFS server in Ubuntu is as easy as installing the following components: nfs-common, nfs-kernel-server, and portmap To install these using Advanced Packaging Tool (APT), run the following command:
yyang@ubuntu-serverA:~$ sudo apt-get -y install nfs-common \ > nfs-kernel-server portmap
The install process will also automatically start up the NFS server, as well as all its attendant services for you You can check this by running
yyang@ubuntu-serverA:~$ rpcinfo -p
To stop the NFS server in Ubuntu, you can type
yyang@ubuntu-serverA:~$ sudo /etc/initd/nfs-kernel-server stop
22:
Network File System (NFS)
THE COMPONENTS OF NFS
Versions 2 and 3 of the NFS protocol rely heavily on RPCs to handle communications between clients and servers RPC services in Linux are managed by the portmap service As mentioned before, this ancillary service is no longer needed in NFSv4 The following list shows the various RPC processes that facilitate the NFS service under Linux The RPC processes are mostly relevant only in NFS versions 2 and 3, but mention is made wherever NFSv4 applies rpcstatd This process is responsible for sending notifications to NFS clients whenever the NFS server is restarted without being gracefully shut down It provides status information about the server to rpclockd when queried This is done via the Network Status Monitor (NSM) RPC protocol It is an optional service that is started automatically by the nfslock service on a Fedora system It is not used in NFSv4 rpcrquotad As its name suggests, rpcrquotad supplies the interface between NFS and the quota manager NFS users/clients will be held to the same quota restrictions that would apply to them if they were working on the local file system instead of via NFS rpcmountd When a request to mount a partition is made, the rpcmountd daemon takes care of verifying that the client has enough permission to make the request This permission is stored in the /etc/exports file (The upcoming section The /etc/exports Configuration File tells you more about the /etc/exports file) It is automatically started by the NFS server init scripts It is not used in NFSv4 rpcnfsd The main component to the NFS system, this is the NFS server/daemon It works in conjunction with the Linux kernel to either load or unload the kernel module as necessary It is, of course, still relevant in NFSv4 NOTE You should understand that NFS itself is an RPC-based service, regardless of the version of the protocol Therefore, even NFSv4 is inherently RPC-based The fine print lies in the fact that most of the previously used ancillary RPC-based services (eg, mountd, statd) are no longer necessary because their individual functions have now been folded into the NFS daemon rpclockd The rpcstatd daemon uses this daemon to handle lock recovery on crashed systems It also allows NFS clients to lock files on the server It is the nfslock service, no longer used in NFSv4 rpcidmapd This is the NFSv4 ID name-mapping daemon It provides this functionality to the NFSv4 kernel client and server by translating user and group IDs to names, and vice versa rpcsvcgssd This is the server-side rpcsec_gss daemon The rpcsec_gss protocol allows the use of the gss-api generic security application programming interface (API) to provide advanced security in NFSv4 rpcgssd This provides the client-side transport mechanism for the authentication mechanism in NFSv4
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