NSCD.CONF(5) Standards, Environments, and Macros NSCD.CONF(5)


nscd.conf - name service cache daemon configuration




The nscd.conf file contains the configuration information for nscd(8).
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, group, exec_attr,
prof_attr, user_attr, ethers, rpc, protocols, networks, bootparams,
auth_attr, services, netmasks, printers, or project.

The attribute field supports the following:

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

debug-level value

Sets the debug level desired. value may range from 0 (the default) to
10. Use of this option causes nscd(8) 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

enable-per-user-lookup value

Enables or disables the ability of nscd to create a per-user nscd. A
per-user nscd performs per-user lookups and manages the per-user
cache. The per-user lookups might not be possible if the
corresponding name service switch backends do not support it or are
not configured to do so. The value of this attribute can be either
yes or no.

keep-hot-count cachename value

This attribute allows the administrator to set the number of entries
nscd(8) 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.

logfile debug-file-name

Specifies name of the file to which debug info should be written. Use
/dev/tty for standard output.

maximum-per-user-nscd value

Sets the maximum number of per-user nscds that can be created and
managed by the main nscd daemon. The value is an integer.

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.

per-user-nscd-time-to-live value

Sets the time-to-live value for a per-user nscd based on the last
time the per-user nscd was active. The value is an integer that
specifies a number of seconds.

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.

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.

This attribute is obsolete and will be silently ignored. nscd now
automatically adjusts the hash table size.


See attributes(7) for descriptions of the following attributes:

|Availibility | SUNWcsu |
|Interface Stability | Committed |


auth_attr(5), bootparams(5), ethers(5), exec_attr(5), group(5), hosts(5),
netmasks(5), networks(5), passwd(5), printers(5), prof_attr(5),
project(5), protocols(5), rpc(5), services(5), user_attr(5),
attributes(7), nscd(8)

March 6, 2017 NSCD.CONF(5)