Interrogating the nodes on ServiceGuard

[Paul Procter]

Hi,

Currently we have scripts that use cmviewcl to ascertain which node the packages are currently running on.

Obviously in a 2-node cluster if one of the nodes is missing this command can take a while to respond.

Are there any other ways to ascertain the node that is running the packages without using cmviewcl?

[Paul Procter]

Oops, in my haste I forgot general courtesies....
:o)

Thanks in anticipation
Paul

[melvyn burnard]

do your ackages have a relocatable ip address?
If so, perhaps a remsh hostname
or uname -n ?

[Michael Steele_2]

Hi

You are using a work around to the preferred way of monitoring in MC/SG, adding monitoring scripts to check for processes up or down or hung or what.

Review the doc I've attached in particular
resource_name (299) *
resource_polling_interval
(299)
resource_start (299)
resource_up_value (299)

...which are used monitors critical
resources via the Event Monitoring Service
(EMS).

Review the logs in /etc/opt/resmon/log and become familiar with this application. EMS will report via snmp all MC/SG errors.

Review the node_fail_fast_enabled parameter.

Review dependency_name and dependency_condition which is dependency that must be met in order for this package to run (or keep running).

This means modifying your binaries so you'll need a test cluster to work on.

If you can't do this then explore 'cmgetconf' and 'cmscancl' commands. This are the man commands used in trouble shooting.

[Paul Procter]

Michael,

Apologies I am a little confused at the response - not the first time I hasten to add!
:o)

Are these configuration parameters able to explain which node is currently running the packages?

I am trying to avoid the 'cmviewcl' command as in a recent exercise we had to take one of the nodes out of the 2-node cluster. The result of which was that all of the scripts that checked to see which node was, if you like, acting as the master node hung for a period of time whilst 'cmviewcl -v' was awaiting a response.

Regards,
Paul

[Michael Steele_2]

Hi

There are built in monitoring templates that you fill in and use in lieu of scripts that parse cmviewcl, see attachement.

[Paul Procter]

Hi,

Thanks for the help, we've taken the approach of having a small logical volume as part of serviceguard

Our scripts will check for this to determins which node they are operating against.