Howdy :)

So I have an NCS cluster made up of SLES10SP2/OES2SP1 nodes running
traditional Linux Volumes with NCP shares (except the Domains which are
NSS ofcourse).

Fabulous no? Well, no...but we won't go there :) Anyway, now I need
to leverage dbcopy called by crontab to create backups of these post
offices (as trying to back them up directly isn't recommended) to
another server which would then pick it up with Tivoli. This is no
problem on a standalone box.

But you know what I'm going to say next :) :) How do I setup a cron
job to only run a command if the volume and cluster resource are loaded?
And how would I manipulate it so that if there were two clusters
running on one node, it would know to backup the data from both
volumes?

What I understand so far is this : I could just setup the same crontab
on all the nodes and have them run whether the volume is mounted or not.
This is problematic and messy as it's error messages galore. I really
don't want to do that.

On a few web pages, I've heard tell of people using scripting to modify
crontab appropriately, but they weren't at all specific.

Has ANYWAY done anything like this before? Even if you've done it with
HA Linux Clusters I'd like to hear from you.

Thanks!

Chuck


--
pattercw
------------------------------------------------------------------------
pattercw's Profile: http://forums.novell.com/member.php?userid=10117
View this thread: http://forums.novell.com/showthread.php?t=366297

Ugh sorry, in my previous post I said "And how would I manipulate it so
that if there were two clusters running on one node, ". I meant two
VOLUMES (or and resources) on one node.


--
pattercw
------------------------------------------------------------------------
pattercw's Profile: http://forums.novell.com/member.php?userid=10117
View this thread: http://forums.novell.com/showthread.php?t=366297

pattercw;1762221 Wrote:
> Ugh sorry, in my previous post I said "And how would I manipulate it so
> that if there were two clusters running on one node, ". I meant two
> VOLUMES (or and resources) on one node.


You can do this a lot of different ways. You can try to create a file
in on the ncs volume and check for it's presence in the cron script. If
it exists then run the job, otherwise exit.


--
eichybush
------------------------------------------------------------------------
eichybush's Profile: http://forums.novell.com/member.php?userid=6341
View this thread: http://forums.novell.com/showthread.php?t=366297

eichybush wrote:

>
> pattercw;1762221 Wrote:
>> Ugh sorry, in my previous post I said "And how would I manipulate it so
>> that if there were two clusters running on one node, ". I meant two
>> VOLUMES (or and resources) on one node.
>
>
> You can do this a lot of different ways. You can try to create a file
> in on the ncs volume and check for it's presence in the cron script. If
> it exists then run the job, otherwise exit.
>
>
Yeah. actually, just create your your script like eichybush said and store
it on the cluster volume.
then in crontab on each box, set the process to run at your specified time
and if the file is there it will run, if not it won't run and will just give
you a message in cron that it couldn't find the file.

Or, you could have crontab run a script that first checks to see if
the file exist using if, like:

if [ -e /media/clusterpart/script ]; then
echo "run script"
else
echo "exiting..."
exit
fi


bb

You two rock. Thank-you so much! I'll give it a shot. I'm a former
Netware guy, and while I understand quite a bit about clustering and
eDirectory etc, I'm ignorant when it comes to Linux scripting :( I
think I need to find a scripting for dummies book and get reading :)


--
pattercw
------------------------------------------------------------------------
pattercw's Profile: http://forums.novell.com/member.php?userid=10117
View this thread: http://forums.novell.com/showthread.php?t=366297

pattercw wrote:

>
> You two rock. Thank-you so much! I'll give it a shot. I'm a former
> Netware guy, and while I understand quite a bit about clustering and
> eDirectory etc, I'm ignorant when it comes to Linux scripting :( I
> think I need to find a scripting for dummies book and get reading :)
>
>

i rely on this link to check my syntax. It's a basic tutorial, but it'll
get you started.
http://www.linuxconfig.org/Bash_scripting_Tutorial


bb