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The nscd.conf file contains the configuration
information for nscd(1M).
Each line specifies either an attribute and
a value, or an attribute, cachename, and a value. Fields
are separated either by SPACE or TAB characters. A `#' (number
sign) indicates the beginning of a comment; characters up to the end of
the line are not interpreted by nscd.
cachename is represented by hosts, ipnodes, passwd,
or groups.
attribute supports the following:
-
logfile debug-file-name
- Specifies name of the file to which debug info should be written.
Use /dev/tty for standard output.
-
debug-level value
- Sets the debug level desired.
value may range from 0 (the
default) to 10. Use of this option causes nscd(1M) to run in the foreground and not become
a daemon. Note that the output of the debugging command is not likely to
remain the same from release-to-release; scripts should not rely on its format.
-
enable-cache cachename value
- Enables or disables
the specified cache. value may be either yes or no.
-
positive-time-to-live cachename value
- Sets the time-to-live
for positive entries (successful queries) in the specified cache. value is in integer seconds. Larger values increase cache
hit rates and reduce mean response times, but increase problems with cache
coherence. Note that sites that push (update) NIS maps nightly can set
the value to be the equivalent of 12 hours or more with very good performance
implications.
-
negative-time-to-live cachename value
- Sets the time-to-live
for negative entries (unsuccessful queries) in the specified cache. value is in integer seconds. Can result in significant performance
improvements if there are several files owned by uids (user IDs) not in
system databases; should be kept small to reduce cache coherency problems.
-
suggested-size cachename value
- Sets the suggested number
of hash buckets in the specified cache. This parameter should be changed
only if the number of entries in the cache exceeds the suggested size by
more than a factor of four or five. Since this is the internal hash table
size, value should remain a prime number for
optimum efficiency.
-
keep-hot-count cachename value
- This attribute allows
the administrator to set the number of entries nscd(1M) is to keep current in the specified
cache. value is an integer number which should
approximate the number of entries frequently used during the day.
-
check-files cachename value
- Enables or disables
checking the file belonging to the specified cachename
for changes. If enabled (which is the default), changes in the corresponding
file cause the cache to be invalidated within 10 seconds. Can be disabled
if files are never modified for a slight performance boost, particularly
over NFS. value may be either yes or no.
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