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[LDM #OVK-233439]: Now that I've worked with LDM 6.7.0.1 for a week...

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  • Subject: [LDM #OVK-233439]: Now that I've worked with LDM 6.7.0.1 for a week...
  • Date: Tue, 01 Apr 2008 20:28:59 -0600
Hi Gilbert,

re:
> It worked!

Excellent!

> So the question is:
> 
> Why did my other script in /etc/rc.d/rc.local stop working properly after
> I installed (clean) Fedora 8, when it worked in Fedora 7 and previous?

Evidently, the way that 'su' works changed subtly between Fedora 7 and 8.
The major difference in what you were doing out of rc.local and what we
did out of /etc/init.d was show 'su' is used:

/etc/rc.d/rc.local (now commented out):

echo "STOPPING LDM"
/bin/su -c "/home/ldm/bin/ldmadmin stop" ldm
echo "CLEANING LDM pids"
/bin/su -c "/home/ldm/bin/ldmadmin clean" ldm
 ...

/etc/init.d/ldmd:

 ...asLdmUser()
{
    su - ldm -c "$@"
}
 ...

Note the difference:

/bin/su -c "/home/ldm/bin/ldmadmin start" ldm

vs

su - ldm -c "/home/ldm/bin/ldmadmin start"

i.e., 'su - ldm -c "command"' vs 'su -c "command" ldm'

We figured this out by comparing the man page for 'su' on weather2 (Fedora 8
dated March 2008(!)) and the man page for 'su' on a RedHat Enterprise 4 system
(dated February 2007).  It looks like 'su' may have been changed very recently.

Moving the LDM startup from /etc/rc.d/rc.local to /etc/init.d was
done to standardize your setup with the rest of the LDM world, AND
because it is the standard way of doing business in Unix/Linux.

Now, for instance, 'root' can do the following:

<as 'root'>
/etc/init.d/ldmd stop
/etc/init.d/ldmd start

The same accessiblity to stopping/starting the LDM by 'root' is not available
in the /etc/rc.d/rc.local approach.

Finally, we (Mike Schmidt and I) are under the impression that the system
should run a 'stop' action for all configured scripts in /etc/init.d/ldmd
when it is shutdown (halted by a 'shutdown' command).  This working has been
iffy on various versions of Linux, however.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: OVK-233439
Department: Support LDM
Priority: Normal
Status: Closed