[ClusterLabs] Custom RA for Multi-Tenant MySQL?

[Eric Robinson]

We're writing a custom RA for a multi-tenant MySQL cluster that runs in active/standby mode. I've read the RA documentation about what exit codes should be returned for various outcomes, but something is still unclear to me.

We run multiple instances of MySQL from one filesystem, like this:

/app_root
                /mysql1
                /mysql2
                /mysql3
                ...etc.

The /app_root filesystem lives on a DRBD volume, which is only mounted on the active node.

When the RA performs a "start," "stop," or "monitor" action on the standby node, the filesystem is not mounted so the mysql instances are not present. What should the return  codes for those actions be? Fail? Not installed? Unknown error?


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