HP-UX Reference (11i v1 05/09) - 1M System Administration Commands A-M (vol 3)

k
krsd(1M) krsd(1M)
NAME
krsd - kernel registry services daemon
SYNOPSIS
krsd -1
krsd
[-i][-d seconds]
DESCRIPTION
krsd saves data, flagged as persistent in the core kernel KRS tree, to files on disk. These files are read
when the system is booted, in order to restore the aforementioned persistent data.
When running in daemon mode, krsd sleeps, waking periodically to check if any persistent data has
changed since the last save. If persistent data has changed, the new state of the data is saved to disk. Oth-
erwise, krsd sleeps for another period of time and then repeats the process.
When running in one time (non-daemon) mode,
krsd unconditionally saves persistent data to disk and
then exits.
Normally,
krsd is executed in daemon mode by init(1M). The /etc/inittab entry for krsd will
cause
krsd to be respawned automatically if it is terminated.
krsd uses the syslog message logging facility to log all krsd activity.
Persistent KRS data is maintained in files based on the class of the data in question. Currently, the follow-
ing classes are recognized:
system specific
Data that applies to the system in general, regardless of what kernel is booted. This data is
saved in the file: system.krs .
kernel specific
Data specific to a given bootable kernel. This data is saved in the file: kernel_name
.krs.
Where kernel_name is the full path name of the kernel in question, with slashes replaced by
underscores. NOTE: This naming scheme is subject to change in the future.
These files are maintained in the following directories:
/stand/krs
The primary KRS directory. This is the directory from which the files are loaded when the sys-
tem is booted. It contains the most recent, consistent copy of persistent KRS data.
/stand/krs_lkg
This directory contains the last known good copies of the KRS data. The files in
/stand/krs
are copied to this directory when the system successfully reaches the sysinit init state. They
are loaded, during boot, if the files in /stand/krs are missing or corrupt.
This scheme ensures that the system will be able to boot to sysinit, in the event the primary
KRS files are found to be corrupt. Once the sysinit state is reached, more recent versions of
the KRS data can be restored to /stand/krs and the system rebooted.
/stand/krs_tmp
This directory contains temporary copies of the KRS data files. Data is first saved to files in this
directory. Once the save is complete, the files are linked to /stand/krs and unlinked from
/stand/krs_tmp.
Options
krsd recognizes the following options:
-1 One time mode, unconditionally save persistent data to disk, then exit.
-i Run from inittab, parent does not spawn a child nor exit. Required if respawn from
inittab is to work properly.
-d seconds Set the delay time to seconds seconds. This is the time interval between attempted saves of
persistent data. The default interval is 300 seconds.
AUTHOR
krsd was developed by Hewlett-Packard Company.
HP-UX 11i Version 1: September 2005 − 1 − Hewlett-Packard Company Section 1M−−413