nscd.conf(4) manual page
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nscd.conf - name service cache daemon configuration
/etc/nscd.conf
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, 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.
nscd(1M)
, group(4)
, hosts(4)
,
passwd(4)
The nscd.conf interface is included in this release
on an uncommitted basis only, and is subject to change or removal in a
future minor release.
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