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Linux Administration: A Beginner s Guide
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Kernel Support for NFS
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NFS is implemented in two forms among the various Linux distributions Most distributions ship with NFS support enabled in the kernel A few Linux distributions also ship with support for NFS in the form of a stand-alone daemon that can be installed via a package As far back as Linux 22, there has been kernel-based support for NFS, which runs significantly faster than earlier implementations As of this writing, kernel-based NFS server support is considered production-ready It is not mandatory if you don t compile support for it into the kernel, you will not use it If you have the opportunity to try kernel support for NFS, it is highly recommended that you do so If you choose not to use it, don t worry the nfsd program that handles NFS server services is completely self-contained and provides everything necessary to serve NFS NOTE On the other hand, clients must have support for NFS in the kernel This support in the kernel has been around for a long time and is known to be stable Almost all present-day Linux distributions ship with kernel support for NFS enabled
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CONFIGURING AN NFS SERVER
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Setting up an NFS server is a two-step process The first step is to create the /etc/exports file This file defines which parts of your server s disk get shared with the rest of your network and the rules by which they get shared (For example, is a client allowed only read access to the file system Are they allowed to write to the file system ) The second step is to start the NFS server processes that read the /etc/exports file
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The /etc/exports Configuration File
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This is the primary configuration file for the NFS server This file lists the partitions that are sharable, the hosts they can be shared with, and with what permissions The file specifies remote mount points for the NFS mount protocol The format for the file is simple Each line in the file specifies the mount point(s) and export flags within one local server file system for one or more hosts Here is the format of each entry in the /etc/exports file:
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/directory/to/export client|ip_network(permissions) client|ip_network(permissions)
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/directory/to/export This is the directory you want to share with other users, for example, /home client This refers to the hostname(s) of the NFS client(s) ip_network This allows the matching of hosts by IP addresses (eg, 1721611) or network addresses with a netmask combination (eg, 1721600/16) permissions These are the corresponding permissions for each client Table 22-1 describes the valid permissions for each client
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Network File System (NFS)
Following is an example of a complete NFS /etc/exports file Please note that line numbers (1 4) have been added to the listing to aid readability
1) 2) 3) 4) # /etc/exports file for serverA # /home hostA(rw) hostB(rw) clientA(ro,no_root_squash) /usr/local 1721600/16(ro)
Lines 1 and 2 are comments and are ignored when the file is read Line 3 exports the /home file system to the machines named hostA and hostB, and gives them read/write (rw) permissions, as well as to the machine named clientA, giving it read-only (ro) access, but allowing the remote root user to have root privileges on the exported file system (/home) Line 4 exports the /usr/local/ directory to all hosts on the 1721600/16 network Hosts in the network range are allowed read-only access
Permission Option secure
Meaning The port number from which the client requests a mount must be lower than 1024 This permission is on by default To turn it off, specify insecure instead Allows read-only access to the partition This is the default permission whenever nothing is specified explicitly Allows normal read/write access The client will be denied access to all directories below /dir/to/mount This allows you to export the directory /dir to the client and then to specify /dir/to as inaccessible without taking away access to something like /dir/from This permission prevents remote root users from having superuser (root s) privileges on remote NFS-mounted volumes The squash here literarily means to squash the power of the remote root user This allows the root user on the NFS client host to access the NFS-mounted directory with the same rights and privileges that the superuser would normally have Maps all user IDs (UIDs) and group IDs (GIDs) to the anonymous user The opposite option is no_all_squash, which is the default setting
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