1NSCD.CONF(5) Linux Programmer's Manual NSCD.CONF(5)
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6 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, services, or netgroup.
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 re‐
26 quests. At least five threads will always be created.
27 max-threads number
29 Specifies the maximum number of threads. The default is 32.
30 server-user user
32 If this option is set, nscd will run as this user and not as
33 root. If a separate cache for every user is used (-S parame‐
34 ter), this option is ignored.
35 stat-user user
37 Specifies the user who is allowed to request statistics.
38 reload-count unlimited | number
40 Limit on the number of times a cached entry gets reloaded with‐
41 out being used before it gets removed. The default is 5.
42 paranoia <yes|no>
44 Enabling paranoia mode causes nscd to restart itself periodi‐
45 cally. The default is no.
46 restart-interval time
48 Sets the restart interval to time seconds if periodic restart is
49 enabled by enabling paranoia mode. The default is 3600.
50 enable-cache service <yes|no>
52 Enables or disables the specified service cache. The default is
53 no.
54 positive-time-to-live service value
56 Sets the TTL (time-to-live) for positive entries (successful
57 queries) in the specified cache for service. Value is in sec‐
58 onds. Larger values increase cache hit rates and reduce mean
59 response times, but increase problems with cache coherence.
60 negative-time-to-live service value
62 Sets the TTL (time-to-live) for negative entries (unsuccessful
63 queries) in the specified cache for service. Value is in sec‐
64 onds. Can result in significant performance improvements if
65 there are several files owned by UIDs (user IDs) not in system
66 databases (for example untarring the Linux kernel sources as
67 root); should be kept small to reduce cache coherency problems.
68 suggested-size service value
70 This is the internal hash table size, value should remain a
71 prime number for optimum efficiency. The default is 211.
72 check-files service <yes|no>
74 Enables or disables checking the file belonging to the specified
75 service for changes. The files are /etc/passwd, /etc/group,
76 /etc/hosts, /etc/services, and /etc/netgroup. The default is
77 yes.
78 persistent service <yes|no>
80 Keep the content of the cache for service over server restarts;
81 useful when paranoia mode is set. The default is no.
82 shared service <yes|no>
84 The memory mapping of the nscd databases for service is shared
85 with the clients so that they can directly search in them in‐
86 stead of having to ask the daemon over the socket each time a
87 lookup is performed. The default is no.
88 max-db-size service bytes
90 The maximum allowable size, in bytes, of the database files for
91 the service. The default is 33554432.
92 auto-propagate service <yes|no>
94 When set to no for passwd or group service, then the .byname re‐
95 quests are not added to passwd.byuid or group.bygid cache. This
96 can help with tables containing multiple records for the same
97 ID. The default is yes. This option is valid only for services
98 passwd and group.
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101 The default values stated in this manual page originate from the source
102 code of nscd(8) and are used if not overridden in the configuration
103 file. The default values used in the configuration file of your dis‐
104 tribution might differ.
105
107 nscd(8)
108
110 This page is part of release 5.13 of the Linux man-pages project. A
111 description of the project, information about reporting bugs, and the
112 latest version of this page, can be found at
113 https://www.kernel.org/doc/man-pages/.
114GNU 2020-12-21 NSCD.CONF(5)