| SYSV-RC-CONF(8) | SYSV-RC-CONF(8) |
sysv-rc-conf - Run-level configuration for SysV like init script links
sysv-rc-conf [ options ]
sysv-rc-conf --list [ service ]
sysv-rc-conf [ --level levels ] service <on|off>
sysv-rc-conf gives an easy to use interface for managing "/etc/rc{runlevel}.d/" symlinks. The interface comes in two different flavors, one that simply allows turning services on or off and another that allows for more fine tuned management of the symlinks. It's a replacement for programs like ntsysv(8) or rcconf(8).
sysv-rc-conf can also be used at the command line when the desired changes to the symlinks are already known. The syntax is borrowed from chkconfig(8), although it does not follow it exactly.
Note
When using either GUI layout described below, all configuration
changes to the symlinks will happen immediately, not when the program exits.
Using the Default layout
The default (simple) layout shows in a grid fashion all of the
services that are in "init.d" and which
runlevels they are turned on at. For example, where the
"ssh" row and 3
column intersect, if there is an 'X' in the box there that means the ssh
service will be turned on when entering runlevel 3. If there is no checkbox
it can mean that either there are no links to the service in that specific
runlevel, or that the service is turned off when entering that runlevel. If
more configuration detail is needed, see the next paragraph and the
--priority option.
Using the Priority layout
The priority (advanced) layout also uses a grid fashion, but
instead of checkboxes there are text boxes that can have a few different
values. If the text box is blank, that means there isn't a symlink in that
runlevel for that service. This means that when changing into that runlevel
that the service will not be started or stopped, which is significant. If
the text box starts with the letter K that means that the service will be
stopped when entering that runlevel. If the text box starts with the letter
S that means the service will be started when entering that runlevel. The
two digits following is the order in which the services are started. That
means that "S08iptables" would start
before "S20ssh". For more information see
your system documentation.
Controls
To move around use the arrow keys, or if the terminal support it,
the mouse. Typically there is more then one page of services (unless the
terminal screen is large), to move between the pages use CTRL-n or CTRL-p,
or simply arrow key down or up at the bottom or top of the screen,
respectively. The bottom of the screen also shows these movement commands
for quick reference. To restore the symlinks back to their original state
before the sysv-rc-conf was run, press the r key. The h
key will display a quick reference help screen.
Default layout
When using the default layout use the space bar to toggle the
service on / off. An 'X' in the checkbox indicates that the service is on.
Priority layout
The priority layout uses the default movement keys. In order to
edit the fields you can use CTRL-d to delete the character in front of the
cursor or backspace to backspace. Use CTRL-b or CTRL-f to move the cursor
backwards or forwards within the field. Note that only S, K, or any digit is
allowed to be entered into the field.
Starting / Stopping Services
To start a service now, press the "+" or "=" key. To stop a service now, press the "-" key.
This will call "/etc/init.d/service start" or "/etc/init.d/service stop".
If the desired modifications to the symlinks are known and only one quick change is needed, then you can use a CLI interface to sysv-rc-conf. Examples:
# sysv-rc-conf --level 35 ssh off # sysv-rc-conf atd on
The first example will turn ssh off on levels 3 and 5. The second example turns atd on for runlevels 2, 3, 4, and 5.
Note: Feel free to skip this section
sysv-rc-conf stores a cache of all the symlink information from "/etc/rc{runlevel}.d/" in "/var/lib/sysv-rc-conf/services" (See the --cache option to change the location of this file). It uses this cache to make an intelligent decision on what priority number to give the K or S link when they are changed in the simple layout. This cache is updated/created everytime the program is launched. The program needs to run with root privileges in order to update the cache. The format of the file is as follows:
RUNLEVEL S|K PRIORITY SERVICE
Here's a few examples:
2 K 74 ntpd 2 K 50 xinetd 3 S 08 iptables 3 S 80 sendmail
sysv-rc-conf will first see if it can get an exact match from the cache. For example, if the symlink for "cron" in runlevel 3 is S89cron and you uncheck it, sysv-rc-conf will first see if there is an entry in the cache that looks like "3 K nn cron", if so it will use nn for the priority number.
If there wasn't a match, sysv-rc-conf will then see if there is another S or K (whichever you're switching to, so in this example, K) entry on a different runlevel - so an entry like "i K nn cron", where i is any runlevel. If found, the link will use nn.
If there still wasn't a match, sysv-rc-conf will look for the opposite of S or K in any run level, and use 100 - that priority. So in our example, "i S nn cron". If nn is 20, then it will use 80 (100 - 20), since that is typically the way that the priority numbers are used.
If there still isn't a match, the default priority of 20 for S links is used, and the default priority of 80 for K links is used.
sysv-rc-conf should work on any Unix like system that manages services when changing runlevels by using symlinks in "/etc/rc{runlevel}.d/". Refer to your system documentation to see if that's the case (usually there's a "/etc/init.d/README").
sysv-rc-conf only manages the symlinks in the "rc{runlevel}.d" directories. It's possible that packages may have other ways of being disabled or enabled.
Because Curses takes over the screen sometimes error messages won't be seen on the terminal. If you run across any weird problems try redirecting STDERR to a file when you execute the program.
For example:
# sysv-rc-conf 2> err.out
Report bugs to Joe Oppegaard <joe@pidone.org>
init(8), runlevel(8), chkconfig(8), "/etc/init.d/README"
www: http://sysv-rc-conf.sourceforge.net ftp: ftp://ftp.pidone.org/sysv-rc-conf
Joe Oppegaard <joe@pidone.org>
| 2005-05-11 | perl v5.8.8 |