nis_cachemgr - maintains a cache containing location information about
/usr/sbin/nis_cachemgr [ -i ] [ -n ] [ -v ]
The nis_cachemgr daemon maintains a cache of the NIS+ directory
objects. The cache contains location information necessary to contact
the NIS+ servers that serve the various directories in the name space.
This includes transport addresses, information neeeded to authenticate
the server, and a time to live field which gives a hint on how long
the directory object can be cached. The cache helps to improve the
performance of the clients that are traversing the NIS+ name space.
nis_cachemgr should be running on all the machines that are using
NIS+. However, it is not required that the nis_cachemgr program be
running in order for NIS+ requests to be serviced.
The cache maintained by this program is shared by all the processes
that access NIS+ on that machine. The cache is maintained in a file
that is memory mapped (see mmap (2)) by all the processes. On
startup, nis_cachemgr initializes the cache from the cold start file
(see nisinit(1M)) and preserves unexpired entries that already exist
in the cache file. Thus, the cache survives machine reboots.
The nis_cachemgr program is normally started from a system startup
Note: The nis_cachemgr program makes NIS+ requests under the NIS+
principal name of the host on which it runs. Before running
nis_cachemgr, security credentials for the host should be added to the
cred.org_dir table in the host's domain using nisaddcred(1M).
Credentials of type DES will be needed if the NIS+ service is
operating at security level 2 (see rpc.nisd(1M)). See the WARNINGS
section, below. Additionally, a 'keylogin -r' needs to be done on the
nisshowcache can be used to look at the cached objects.
-i Force nis_cachemgr to ignore the previous cache file and
reinitialize the cache from just the cold start file. By default,
the cache manager initializes itself from both the cold start
file and the old cache file, thereby maintaining the entries in
the cache across machine reboots.
-n Run nis_cachemgr in an insecure mode. By default, before adding a
directory object to the shared cache, on the request of another
process on the machine, it checks the encrypted signature on the
request to make sure that the directory object is a valid one and
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000
is sent by an authorized server. In this mode, nis_cachemgr adds
the directory object to the shared cache without making this
-v This flag sets verbose mode. In this mode, the nis_cachemgr
program logs not only errors and warnings, but also additional
status messages. The additional messages are logged using
syslog(3C) with a priority of LOG_INFO.
The nis_cachemgr daemon logs error messages and warnings using syslog
(see syslog(3C)). Error messages are logged to the DAEMON facility
with a priority of LOG_ERR, and warning messages with a priority of
LOG_WARNING. Additional status messages can be obtained using the -v
If the host principal does not have the proper security credentials in
the cred.org_dir table for its domain, then running this program
without the '-n' insecure mode option may significantly degrade the
performance of processes issuing NIS+ requests.
/var/nis/NIS_SHARED_DIRCACHE the shared cache file
/var/nis/NIS_COLD_START the coldstart file
/etc/init.d/rpc initialization scripts for
nis_cachemgr was developed by Sun Microsystems, Inc.
keylogin(1), nisaddcred(1M), nisinit(1M), nisshowcache(1M),
rpc.nisd(1M), mmap(2), syslog(3C), nisfiles(4).
Hewlett-Packard Company - 2 - HP-UX Release 11i: November 2000