Chapter 15Accessing Network File Systems (Reference)
This chapter provides an introduction to the NFS commands,
as well as information about all of the pieces of the NFS environment and
how these pieces work together.
NFS Files
You need several files to support NFS activities on any computer. Many
of these files are ASCII, but some of the files are data files. Table 15-1
lists these files and their functions.
Table 15-1 NFS Files
File Name | Function |
|---|
/etc/default/fs | Lists the default file system
type for local file systems. |
/etc/default/nfs | Lists configuration information for lockd and nfsd. |
/etc/default/nfslogd | Lists
configuration information for the NFS server logging daemon, nfslogd. |
/etc/dfs/dfstab | Lists the local resources to be shared. |
/etc/dfs/fstypes | Lists the default
file-system types for remote file systems. |
/etc/dfs/sharetab | Lists the local and remote resources that
are shared. See the sharetab(4)
man page. Do not edit this file. |
/etc/mnttab | Lists file systems that are currently mounted, including
automounted directories. See the mnttab(4) man page. Do not edit this file. |
/etc/netconfig | Lists the transport protocols. Do not edit this file. |
/etc/nfs/nfslog.conf | Lists
general configuration information for NFS server logging. |
/etc/nfs/nfslogtab | Lists
information for log post-processing by nfslogd. Do not
edit this file. |
/etc/nfssec.conf | Lists NFS security
services. |
/etc/rmtab | Lists file systems that
are remotely mounted by NFS clients. See the rmtab(4) man page. Do not edit this
file. |
/etc/vfstab | Defines file systems
to be mounted locally. See the vfstab(4) man page. |
The first entry in /etc/dfs/fstypes is often used
as the default file-system type for remote file systems. This entry defines
the NFS file-system type as the default.
Only one entry is in /etc/default/fs: the default
file-system type for local disks. You can determine the file-system types
that are supported on a client or server by checking the files in /kernel/fs.
/etc/default/nfslogd File
This file defines some of the parameters that are used when using NFS
server logging. The following parameters can be defined.
- CYCLE_FREQUENCY
Determines the number
of hours that must pass before the log files are cycled. The default value
is 24 hours. This option is used to prevent the log files from growing too
large.
- IDLE_TIME
Sets the number of seconds nfslogd should sleep before checking for more information in the
buffer file. This parameter also determines how often the configuration file
is checked. This parameter, along with MIN_PROCESSING_SIZE, determines how
often the buffer file is processed. The default value is 300 seconds. Increasing
this number can improve performance by reducing the number of checks.
- MAPPING_UPDATE_INTERVAL
Specifies
the number of seconds between updates of the records in the file-handle-to-path
mapping tables. The default value is 86400 seconds or one day. This parameter
helps keep the file-handle-to-path mapping tables up-to-date without having
to continually update the tables.
- MAX_LOGS_PRESERVE
Determines the
number of log files to be saved. The default value is 10.
- MIN_PROCESSING_SIZE
Sets the minimum
number of bytes that the buffer file must reach before processing and writing
to the log file. This parameter, along with IDLE_TIME, determines how often
the buffer file is processed. The default value is 524288 bytes. Increasing
this number can improve performance by reducing the number of times the buffer
file is processed.
- PRUNE_TIMEOUT
Selects the number
of hours that must pass before a file-handle-to-path mapping record times
out and can be pruned. The default value is 168 hours or 7 days.
- UMASK
Specifies the file mode creation
mask for the log files that are created by nfslogd. The
default value is 0137.
/etc/nfs/nfslog.conf File
This file defines the path, file names, and type of logging to be used
by nfslogd. Each definition is associated with a tag. Starting NFS server logging requires that you identify
the tag for each file system. The global tag defines
the default values. You can use the following parameters with each tag as
needed.
- defaultdir=path
Specifies the default directory path for the logging files. Unless you specify differently, the
default directory is /var/nfs.
- log=path/filename
Sets the path and file name for the log files. The default is /var/nfs/nfslog.
- fhtable=path/filename
Selects the path and file name for the file-handle-to-path
database files. The default
is /var/nfs/fhtable.
- buffer=path/filename
Determines the path and file name for the buffer files. The default is /var/nfs/nfslog_workbuffer.
- logformat=basic|extended
Selects the format to be used
when creating user-readable log files. The basic format produces a log file
that is similar to some ftpd daemons. The extended format
gives a more detailed view.
If the path is not specified, the path that is defined
by defaultdir is used. Also, you can override defaultdir by using an absolute path.
To identify the files more easily, place the files in separate directories.
Here is an example of the changes that are needed.
% cat /etc/nfs/nfslog.conf
#ident "@(#)nfslog.conf 1.5 99/02/21 SMI"
#
.
.
# NFS server log configuration file.
#
global defaultdir=/var/nfs \
log=nfslog fhtable=fhtable buffer=nfslog_workbuffer
publicftp log=logs/nfslog fhtable=fh/fhtables buffer=buffers/workbuffer
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In this example, any file system that is shared with log=publicftp would use the following values:
The default directory would be /var/nfs.
Log files would be stored in /var/nfs/logs/nfslog*.
File-handle-to-path database tables would be stored in /var/nfs/fh/fhtables.
Buffer files would be stored in /var/nfs/buffers/workbuffer.
For procedural information, refer to How to Enable NFS Server Logging.
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