NSCD.CONF(5)NSCD.CONF(5)NAME
/etc/nscd.conf - name service cache daemon configuration file
DESCRIPTION
The file /etc/nscd.conf is read from nscd(8) at startup. Each line
specifies either an attribute and a value, or an attribute, service,
and a value. Fields are separated either by SPACE or TAB characters. A
`#' (number sign) indicates the beginning of a comment; following char‐
acters, up to the end of the line, are not interpreted by nscd.
Valid services are passwd, group, or hosts.
logfile debug-file-name
Specifies name of the file to which debug info should be writ‐
ten.
debug-level value
Sets the desired debug level.
threads number
This is the number of threads that are started to wait for
requests. At least five threads will always be created.
server-user user
If this option is set, nscd will run as this user and not as
root. If a separate cache for every user is used (-S parame‐
ter), this option is ignored.
enable-cache service <yes|no>
Enables or disables the specified service cache.
positive-time-to-live service value
Sets the TTL (time-to-live) for positive entries (successful
queries) in the specified cache for service. Value is in sec‐
onds. Larger values increase cache hit rates and reduce mean
response times, but increase problems with cache coherence.
negative-time-to-live service value
Sets the TTL (time-to-live) for negative entries (unsuccessful
queries) in the specified cache for service. Value is in sec‐
onds. Can result in significant performance improvements if
there are several files owned by UIDs (user IDs) not in system
databases (for example untarring the linux kernel sources as
root); should be kept small to reduce cache coherency problems.
suggested-size service value
This is the internal hash table size, value should remain a
prime number for optimum efficiency.
check-files service <yes|no>
Enables or disables checking the file belonging to the specified
service for changes. The files are /etc/passwd, /etc/group, and
/etc/hosts.
max-threads threads
Specifies the maximum number of threads to be started.
stat-user username
Specifies the user who is allowed to request statistics.
reload-count unlimited | number
Limit on the number of times a cached entry gets reloaded with‐
out being used before it gets removed. The default is 5.
paranoia <yes|no>
Enabling paranoia mode causes nscd to restart itself periodi‐
cally.
restart-interval time
Sets the restart interval to time seconds if periodic restart is
enabled by enabling paranoia mode.
persistent service <yes|no>
Keep the content of the cache for service over server restarts;
useful when paranoia mode is set.
shared service <yes|no>
The memory mapping of the nscd databases for service is shared
with the clients so that they can directly search in them
instead of having to ask the daemon over the socket each time a
lookup is performend.
reload-count unlimited|<number>
Sets the number of times a cached record is reloaded before it
is pruned from the cache. Each cache record has a timeout, when
that timeout expires, nscd will either reload it (query the NSS
service again if the data hasn't changed), or drop it.
paranoia <yes|no>
Enables or disables restart of nscd every restart-interval .
restart-interval <time in seconds>
Is interval in which nscd is restarted if option paranoia is
set. The default value is 3600.
persistent service <yes|no>
Enables or disables persistent storage of data. Persistent
caches are stored on the disk and therefore survive a nscd
restart or e.g. machine reboot.
shared service <yes|no>
Enables or disables database saring among nscd clients (by being
read-only mmapped in their address space, so the nscd client can
directly do the lookup and only if an entry is not found there,
ask nscd over socket to do the lookup).
max-db-size service number-of-bytes
The maximum allowable size for the service.
auto-propagate service <yes|no>
When set to no for passwd or group service, then the .byname
requests are not added to passwd.byuid or group.bygid cache.
This can help with tables containing multiple records for the
same id.
SEE ALSOnscd(8)AUTHOR
nscd was written by Thorsten Kukuk and Ulrich Drepper.
GNU C Library 1999-10 NSCD.CONF(5)
