NSCD.CONF(5) BSD File Formats Manual NSCD.CONF(5)NAMEnscd.conf — nscd configuration file
The nscd.conf file is used by the nscd(8) daemon and is read on its
startup. Its syntax is mostly similar to the nscd.conf syntax in Linux
and Solaris. It has some differences, though — see them below.
Each line specifies either an attribute and a value, or an attribute, a
cachename and a value. Usual cachenames are “passwd”, “group”, “hosts”,
“services”, “protocols” and “rpc”. You can also use any other cachename
(for example, if some third-party application uses nsswitch).
Number of threads, which would listen for connections and process
requests. The minimum is 1. The default value is 8.
enable-cache [cachename] [yes | no]
Enables or disables the cache for specified cachename.
positive-time-to-live [cachename] [value]
Sets the TTL (time-to-live) for the specified cache in seconds.
Larger values can increase system's performance, but they also
can affect the cache coherence. The default value is 3600.
positive-policy [cachename] [fifo | lru | lfu]
The policy that is applied to erase some of the cache elements,
when the size limit of the given cachename is exceeded. Possible
policies are: fifo (first-in-first-out), lru (least-recently-
used), and lfu (least-frequently-used). The default policy is
negative-time-to-live [cachename] [value]
The TTL of the negative cached elements in seconds. The larger
values can significantly increase system performance in some
environments (when dealing with files with UIDs, which are not in
system databases, for example). This number should be kept low
to avoid the cache coherence problems. The default value is 60.
negative-policy [cachename] [fifo | lru | lfu]
The same as the positive-policy, but this one is applied to the
negative elements of the given cachename. The default policy is
suggested-size [cachename] [value]
This is the internal hash table size. The value should be a
prime number for optimum performance. You should only change
this value when the number of cached elements is significantly
(in 5-10 times) greater then the default hash table size (255).
keep-hot-count [cachename] [value]
The size limit of the cache with the given cachename. When it is
exceeded, the policy will be applied. The default value is 2048.
perform-actual-lookups [cachename] [yes | no]
If enabled, the nscd(8) does not simply receive and cache the
NSS-requests results, but performs all the lookups by itself and
only returns the responses. If this feature is enabled, then for
the given cachename nscd(8) will act similarly to the NSCD.
NOTE: this feature is currently experimental — it supports only
“passwd”, “group” and “services” cachenames.
You can use the ‘#’ symbol at the beginning of the line for comments.
Michael Bushkov ⟨firstname.lastname@example.org⟩
Please send bug reports and suggestions to ⟨email@example.com⟩.
BSD April 30, 2006 BSD