packages dependecies

[Mauro Gatti]

Hi all,
I have two packages pkgA and pkgB.
pkgB is dependent on pkgA:
-pkgB have to run only on node where pkgA is running
-pkgB have to run only if pkgA is running

I configured pkgB as shown below:
RESOURCE_NAME /cluster/package/package_status/pkgA
RESOURCE_POLLING_INTERVAL 60
RESOURCE_START AUTOMATIC
RESOURCE_UP_VALUE = UP

I would like that if pkgA switched from a node to another pkgB would follow it but it happens that pkgA switches but pkgB stops running.

Could you give me any hint about how to create dependencies between packages?

Thank You


RGDS

[Duncan Edmonstone · Accepted solution]

Mauro,

If you are on 11iv2 (11.23), then consider upgrading to the recently released Serviceguard 11.18 where simple package dependencies like this are supported:

http://docs.hp.com/en/B3936-90117/ch04s08.html#cihfgeaj

If you are still on 11iv1 (11.11) the I'm afraid you will have to script this.

Of course I have to ask the question - if pkgB can only run *where* pkgA is running and can only run *when* pkgA is running, why do you have 2 packages? Why not just combine everything into one package?

HTH

Duncan

[Stephen Doud]

If you don't have the option to upgrade to A.11.18, then another method to manage package dependencies is to use package A's package control script to start package B on the same node after package A completes successful startup. Package B's control script can be editted to test whether Package A is already running on the same node before allowing package B to start.
You may also set up a package monitor for package B to test for the presence of package A on the same node, and if it is not - halt package B.

[Mauro Gatti]

Thank You Duncan,
I'm running 11.17 and I think I will upgrade to 11.18
Two packages are apache and tomcat.
Sometimes we allow tomcat to be down but we can't afford to have apache down also.

RGDS


Mauro

[Mauro Gatti]

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