| RC(8) |
AerieBSD 1.0 Refernce Manual |
RC(8) |
NAME
rc —
command scripts for system startup
SYNOPSIS
/etc/rc
/etc/rc.local
/etc/rc.securelevel
DESCRIPTION
rc
is the command script that is invoked by
init(8)
during an automatic reboot and after single user mode is exited;
it performs system housekeeping chores and starts up system daemons.
Additionally,
rc
is intricately tied to the
netstart(8)
script, which runs commands and daemons pertaining to the network.
The
rc.securelevel
and
rc.local
scripts hold commands which are pertinent only to a specific site.
All four of these startup scripts are (or can be) controlled to some
extent by variables defined in
rc.conf(8)
and
rc.conf.local(8),
which specify which daemons and services to run.
When an automatic reboot is in progress,
rc
is invoked with the argument
autoboot.
The first portion of
rc
runs an
fsck(8)
with option
-p
to
“preen”
all disks of minor inconsistencies resulting
from the last system shutdown and to check for serious inconsistencies
caused by hardware or software failure.
If this auto-check and repair succeeds, then the second part of
rc
is run.
However, if the file
/fastboot
exists,
fsck(8)
will not be invoked during this boot.
This file is then removed so that fsck will be run on subsequent boots.
The second part of
rc,
which is run after an auto-reboot succeeds and also if
rc
is invoked when a single user shell terminates (see
init(8/)),
then asks
rc.conf(8)
for configuration variables,
mounts filesystems, starts system daemons,
preserves editor files,
clears the scratch directory
/tmp,
and saves any possible core image that might have been
generated as a result of a system crash, with
savecore(8).
Before
rc
starts most system daemons,
netstart(8)
is executed.
rc.securelevel
is executed by
rc
to start daemons that must be run before the security level changes.
Following this,
rc
then sets the security level to the value specified in the
securelevel
variable in that file.
See
securelevel(7)
for the effects of setting the security level.
rc.local
is executed towards the end of
rc
(it is not the very last as there are a few services that must be
started at the very end).
Normally,
rc.local
contains commands and daemons that are not part of the
stock installation.
CONFIGURATION EXAMPLES
The
rc.conf(8)
file contains a series of Bourne-shell syntax assignments that
are used to configure kernel configurations, network configuration,
and various other system daemons.
As described above, this file is sourced (using
sh(1)
of course) by
/etc/rc.
Various comments in
rc.conf(8)
make it clear what each variable does.
Refer to the specific man pages for each daemon to determine what that
subsystem does.
For example, the
lpd(8)
daemon is controlled by the following line:
lpd_flags=NO # for normal use: "" (or "-l" for debugging)
This does not start
lpd(8)
at system startup.
To start
lpd(8),
the following entry can be used:
lpd_flags="" # for normal use: "" (or "-l" for debugging)
Alternately,
lpd(8)
can be started with the
-l
flag (to log remote connections):
lpd_flags="-l" # for normal use: "" (or "-l" for debugging)
EXTERNAL INFLUENCES
Before
init(8)
starts
rc,
it sets the process priority, umask, and resource limits according to the
“daemon”
login class as described in
login.conf(5).
FILES
- /etc/rc
-
Command scripts for system startup.
- /etc/rc.local
-
Site specific command scripts for system startup.
- /etc/rc.conf
-
System daemon configuration database.
- /etc/rc.conf.local
-
Site specific daemon configuration database.
- /etc/rc.securelevel
-
Commands run before the security level changes.
- /etc/rc.shutdown
-
Commands run at system shutdown.
- /etc/login.conf
-
Login class capability database.
- /etc/netstart
-
Command script for network startup.
- /fastboot
-
Tells
rc(8)
not to run
fsck(8)
during the next boot.
SEE ALSO
login.conf(5),
sysctl.conf(5),
securelevel(7),
init(8),
netstart(8),
rc.conf(8),
rc.shutdown(8),
reboot(8),
savecore(8)
HISTORY
The
rc
command appeared in
4.0BSD.
| AerieBSD 1.0 Reference Manual |
August 26 2008 |
RC(8) |