1NSCD.CONF(5) Linux Programmer's Manual NSCD.CONF(5)
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6 /etc/nscd.conf - name service cache daemon configuration file
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9 The file /etc/nscd.conf is read from nscd(8) at startup. Each line
10 specifies either an attribute and a value, or an attribute, service,
11 and a value. Fields are separated either by SPACE or TAB characters.
12 A '#' (number sign) indicates the beginning of a comment; following
13 characters, up to the end of the line, are not interpreted by nscd.
14 Valid services are passwd, group, hosts or services.
16 logfile debug-file-name
18 Specifies name of the file to which debug info should be writ‐
19 ten.
20 debug-level value
22 Sets the desired debug level. The default is 0.
23 threads number
25 This is the number of threads that are started to wait for
26 requests. At least five threads will always be created.
27 server-user user
29 If this option is set, nscd will run as this user and not as
30 root. If a separate cache for every user is used (-S parame‐
31 ter), this option is ignored.
32 enable-cache service <yes|no>
34 Enables or disables the specified service cache. The default is
35 no.
36 positive-time-to-live service value
38 Sets the TTL (time-to-live) for positive entries (successful
39 queries) in the specified cache for service. Value is in sec‐
40 onds. Larger values increase cache hit rates and reduce mean
41 response times, but increase problems with cache coherence.
42 negative-time-to-live service value
44 Sets the TTL (time-to-live) for negative entries (unsuccessful
45 queries) in the specified cache for service. Value is in sec‐
46 onds. Can result in significant performance improvements if
47 there are several files owned by UIDs (user IDs) not in system
48 databases (for example untarring the linux kernel sources as
49 root); should be kept small to reduce cache coherency problems.
50 suggested-size service value
52 This is the internal hash table size, value should remain a
53 prime number for optimum efficiency. The default is 211.
54 check-files service <yes|no>
56 Enables or disables checking the file belonging to the specified
57 service for changes. The files are /etc/passwd, /etc/group,
58 /etc/hosts and /etc/services. The default is yes.
59 max-threads threads
61 Specifies the maximum number of threads. The default is 32.
62 stat-user username
64 Specifies the user who is allowed to request statistics.
65 reload-count unlimited | number
67 Limit on the number of times a cached entry gets reloaded with‐
68 out being used before it gets removed. The default is 5.
69 paranoia <yes|no>
71 Enabling paranoia mode causes nscd to restart itself periodi‐
72 cally. The default is no.
73 restart-interval time
75 Sets the restart interval to time seconds if periodic restart is
76 enabled by enabling paranoia mode. The default is 3600.
77 persistent service <yes|no>
79 Keep the content of the cache for service over server restarts;
80 useful when paranoia mode is set. The default is no.
81 shared service <yes|no>
83 The memory mapping of the nscd databases for service is shared
84 with the clients so that they can directly search in them
85 instead of having to ask the daemon over the socket each time a
86 lookup is performed. The default is no.
87 max-db-size service number-of-bytes
89 The maximum allowable size of the database files in bytes for
90 the service. The default is 33554432.
91 auto-propagate service <yes|no>
93 When set to no for passwd or group service, then the .byname
94 requests are not added to passwd.byuid or group.bygid cache.
95 This may help for tables containing multiple records for the
96 same id. The default is yes. This option is valid only for ser‐
97 vices passwd and group.
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100 nscd(8)
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103 This page is part of release 3.22 of the Linux man-pages project. A
104 description of the project, and information about reporting bugs, can
105 be found at http://www.kernel.org/doc/man-pages/.
106GNU 1999-10-01 NSCD.CONF(5)