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NSCD.CONF(5) Linux Programmer's Manual NSCD.CONF(5)
NAME
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, hosts, services, or netgroup.
logfile debug-file-name
Specifies name of the file to which debug info should be written.
debug-level value
Sets the desired debug level. The default is 0.
threads number
This is the number of threads that are started to wait for requests. At least five threads will always be created.
max-threads number
Specifies the maximum number of threads. The default is 32.
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 parameter), this option is ignored.
stat-user user
Specifies the user who is allowed to request statistics.
reload-count unlimited | number
Limit on the number of times a cached entry gets reloaded without being used before it gets removed. The default is 5.
paranoia <yes|no>
Enabling paranoia mode causes nscd to restart itself periodically. The default is no.
restart-interval time
Sets the restart interval to time seconds if periodic restart is enabled by enabling paranoia mode. The default is 3600.
enable-cache service <yes|no>
Enables or disables the specified service cache. The default is no.
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 seconds. 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 seconds. Can result in signifi‐
cant 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. The default is 211.
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, /etc/hosts, /etc/services,
and /etc/netgroup. The default is yes.
persistent service <yes|no>
Keep the content of the cache for service over server restarts; useful when paranoia mode is set. The default is no.
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 dae‐
mon over the socket each time a lookup is performed. The default is no.
max-db-size service bytes
The maximum allowable size, in bytes, of the database files for the service. The default is 33554432.
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 con‐
taining multiple records for the same ID. The default is yes. This option is valid only for services passwd and group.
NOTES
The default values stated in this manual page originate from the source code of nscd(8) and are used if not overridden in the configuration file. The default
values used in the configuration file of your distribution might differ.
SEE ALSO
nscd(8)
GNU 2020-12-21 NSCD.CONF(5)