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CHAPTER 26 Network File System and Caching File System CHAPTER 27 Sendmail CHAPTER 28 Domain Name Service CHAPTER 29 Network Information Service (NIS/NIS+) CHAPTER 30 Lightweight Directory Access Protocol (LDAP) CHAPTER 31 Samba CHAPTER 32 Application Development and Debugging CHAPTER 33 Web Applications and Services
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his chapter examines Sun s Network File System (NFS), which is a distributed file system architecture based on the Remote Procedure Call (RPC) protocol. RPC is a standard method of allocating and managing shared resources between Solaris systems. Although NFS is similar to Samba in concept, supporting transparent file system sharing between systems, NFS features high data throughput because of dedicated support in the Solaris kernel, and support for both NFS 2 and 3 clients. NFS was one of the first distributed network applications to ever be successfully deployed on local area networks. It allows users to mount volumes of other systems connected to the network, with the same ability as any other locally mounted file system to change permissions, delete and create files, and apply security measures. One of the great advantages of NFS is its efficient use of network bandwidth, by using RPC calls. In Solaris 10, the NFS concept has been extended to the Internet, with the new WebNFS providing file system access through a URL similar to that used for web pages. This chapter examines the theory behind distributed file systems and examines how they can best be established in practice. Prior to Solaris 2.5, NFS 2 was deployed, which used the unreliable User Datagram Protocol (UDP) for data transfer, hence NFS 2 s poor reputation for data integrity. However, the more modern NFS 3 protocol, based around TCP, has been implemented in all new Solaris releases since Solaris 2.5.1. NFS 3 allowed an NFS server to cache NFS client requests in RAM, thus speeding up disk writing operations and the overall speed of NFS transactions. In addition, Solaris 2.6 and above provides support for WebNFS. The WebNFS protocol allows file systems to be shared across the Internet, as an alternative to traditional Internet file-sharing techniques, like FTP. Solaris 10 is supplied the new NFS 4. NFS 4 has many improved features compared to NFS 3, which will be examined in this chapter. In this chapter, you learn how to set up and install an NFS server and an NFS client, and how to export file systems. In addition, this chapter examines how to set up the automounter, so that a user s home directory across all machines on an intranet is automatically shared and available, irrespective of the user s login host.
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Key Concepts
The following concepts are required knowledge for installing and managing NFS.
NFS Architectures
A Solaris 10 system can share any of its locally mounted file systems with other systems, making them available for remote mounting. NFS considers the system that shares the file system to be a server, and the system that remotely mounts the file system as a client. When an NFS client mounts a remote file system, it is connected to a mount point on the local file system, which means it appears to local users as just another file system. For example, a system called carolina may make its mail directory /var/mail available for remote mounting by NFS clients. This would allow users on machines like georgia, virginia, and fairfax to read their mail, actually stored on carolina, locally from their own machines without having to explicitly log in to carolina. This means that a single mail server that acts as an NFS server can serve all NFS clients on a LAN with mail. Figure 26-1 shows this configuration. However, one important aspect of NFS is that it enables you to export file systems and mount them on a remote mount point that is different from the original shared directory. For example, the NFS server carolina may also export its Sun Answerbook files (from the directory /opt/answerbook) to the clients virginia, georgia, and fairfax. However, virginia mounts these files in the /usr/local/www/htdocs directory, as it publishes them via the Web, whereas georgia mounts them in /opt/doc/answerbook. The client fairfax mounts them in /opt/answerbook using the same mount point name as carolina. The point is that the remote mount point can be completely different from the actual directory exported by an NFS server. This configuration is shown in Figure 26-2.
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