Re: Managing services

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Fabrício Santos wrote:
Viva a todos,

Since at install time of my FC1 I did a pretty dumb instalation, Apache and
Samba were not automatically configured to start at boot up and I have done
it manually after. What I did was going to /etc/rc3.d and issued the
following command:

ln -s /etc/init.d/httpd S35httpd

The default is "S85httpd". You want it to start pretty late in the process, to make sure the rest of the system is ready to go.

Now I have a couple of questions and a couple of assumptions that I believe
true but am not sure about. So answers to my questions or links to further
reading will be most welcome.

1. service command.

I know a service in /etc/init.d (or /etc/rc.d/init.d/) may be started using
the service command but I couldn't find any proper docs on it. No man page
available. No --help switch available. Only the following is displayed when
the command is run:

   Usage: service < option > | --status-all | [ service_name [ command
| --full-restart ] ]

Are there any more extensive docs to this utility?

"service" is _very_ similar to chkconfig. "service" is also a pretty simple shell script and is found in /sbin. Take a look at it.

2. /etc/rcX.d

Inside the rcX.d directories, there are files named K99servicename and
S99servicename. I supose the K stands for Kill at reboot or halt time, and S
stands for Start at bootup time. Then the numbers are just a way of sorting
the way the services are started or stopped. Is this correct? Where can I
learn more on these matters?

That is correct. When _entering_ a run level, all of the "Sxxyyyy" scripts are executed in ASCII sort order. When _leaving_ a run level, all of the "Kxxyyyy" scripts are run, again in ASCII sort order, then the run level is changed and the "Sxxyyyy" scripts in the new rcx.d directory are run. And so it goes. BTW, ASCII sort order is the same as you'd get if you did "ls -l /etc/rc.d/rcx.d/S*".

Most reasonably complete system admin manuals explain this.  You might
want to pick up one of the Linux-specific administration manuals
available from O'Reilly, Sybex, Prentiss-Hall or other publishers.

3. ln -s /etc/init.d/httpd S35httpd

Is there any FC1 text based utility that may create these links
automatically instead of forcing the way manually like I did?

"chkconfig", "ntsysv", "redhat-config-services" would all do it. One of the lines in the /etc/rc.d/init.d version of the script controls which link would be created. Again, you want it to be "S85httpd", not "S35httpd", and the line that would control how one of the above utilities created the link is:

	# chkconfig : - 85 15

The "-" means it's not to be started by default in any run level. The
"85" means that the "Sxx" link should be "S85httpd", and the "15" means
the "Kxx" link should be "K15httpd" (start late, terminate early).

Thanks for your help!

You're welcome! ;-) ---------------------------------------------------------------------- - Rick Stevens, Senior Systems Engineer [email protected] - - VitalStream, Inc. - - - - Consciousness: that annoying time between naps. - ----------------------------------------------------------------------

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