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Sharing a Directory Using NFS
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Let s assume that there are two computers for our NFS setup. The first computer has the IP address of 192.168.1.11, and the second computer, 192.168.1.12. The first computer will be our NFS server, and you will edit the exports file on this server share the /var/tmp directory for the second computer. Later, you will use the second computer to mount the directory being shared by the first to share files. 1. Open the exports file in /etc, and add the lines shown in Listing 14-2 at the bottom of the file. This means that you want to share the /var/tmp directory of first computer to the second computer and allow read and write access to it. Save the file, and exit the text editor.
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CHAPTER 14 FILE SHARING SERVICES
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Next, copy a file for the second computer to use later when it mounts the shared directory you just added. The services file found in /etc is a good one, and you can put a copy on /var/tmp as follows using cp /etc/services /var/tmp. Then start the NFS server by issuing service nfs start. That will start the daemons that enable NFS to share files on NFS clients.
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Listing 14-2. Let the second computer have read and write access to this directory. /var/tmp 192.168.1.12(rw)
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If your NFS server is running on a network with a firewall, it won t work because RPC does not use fixed ports when sending and receiving requests. Keep this in mind when you are experiencing problems in your NFS setup.
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Sharing Directories Using NFS Daemons
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When you start your NFS server, five daemons activated:: rpc.nfsd, rpc.lockd, rpc.statd,rpc.mountd, and rpc.rquotad. You will see how these daemons play a role in sharing directories with NFS. The rpc.nfsd daemon is the main server process for NFS, and it accepts RPC calls made by the NFS clients. These RPC calls hold the operations that are required to be done on a file, such as updating or deleting. The rpc.statd daemon implements NSM (Network Status Monitor) RPC protocol. The rpc.statd daemon also provides information that helps the rpc.lockd daemon do file lock recovery procedures in case the NFS server goes down. The rpc.lockd daemon provides locking services for NFS and will prevent users who are trying to change a file that is currently being used by another user. For example, if you are editing a document, only you will be able to make changes to it, and other users who want access will have to wait for you to finish. They can still read the document if they want to. The rpc.mountd daemon handles the mount requests of the available shared directories by the NFS clients through the NFS mount protocol. If an NFS client wants to mount on a shared directory on the NFS server, rpc.mountd will check the contents of the configuration file if the NFS client can use the shared directory. When the NFS client is validated, the NFS server will provide the NFS client a handle that indicates that the share is acquired. The client will use this handle to mount the share. Users cannot mount available shared directories without this daemon running on the server. Similar to regular filesystem quotas, rpc.rquotad provides quota support for remote filesystem shares. With rpc.rquotad, you can put a quota on a mounted NFS filesystem to provide limitations to file storage use in remote shares when required.
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Mounting a Shared Directory As the Client
Earlier, you added a directory that can be mounted by NFS clients to the exports file and started the NFS service to accept NFS requests. This time, you will see how an NFS client will mount the shared directory on the NFS server by using the second computer with the IP address of 192.168.1.12 on our example setup. To mount an NFS shared directory, you will use the mount command, the same command used to mount partitions on your system. The difference in mounting a local partition and an NFS share lies in specifying the NFS server s hostname or IP address along with the server s shared directory. The syntax to mount NFS shares as a client follows: mount server_name:shared_directory mount_point where server_name is the hostname or IP address of the NFS server that has the remote shared directory you want to mount to. The shared_directory is the directory path of the NFS share that is being shared
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