NSCD.CONF(5) Linux Programmer's Manual 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
characters, 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 performed.
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 may help for tables containing multiple records for the
same id.
SEE ALSOnscd(8)COLOPHON
This page is part of release 3.35 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://man7.org/linux/man-pages/.
GNU 1999-10-01 NSCD.CONF(5)
