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.
Specifies name of the file to which debug info should be
Sets the desired debug level. The default is 0.
This is the number of threads that are started to wait
for requests. At least five threads will always be created.
Specifies the maximum number of threads. The default is
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.
Specifies the user who is allowed to request
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.
Enabling paranoia mode causes nscd to restart itself
periodically. The default is no.
Sets the restart interval to time seconds if
periodic restart is enabled by enabling paranoia mode. The default is
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 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. 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
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. 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 containing multiple
records for the same ID. The default is yes. This option is valid only for
services passwd and group.