Perhaps there are some operations that don't need a system call (like file tests, unlinking files etc.), but in the general case... no, nothing more "in the house".

Not really sure what this has to do with high availability, but you might want to look at the modules IPC::Run and IPC::Open3 to have more control over the processes you are running.

I was wondering about a package so I can do it "in the house".

In what house? that of perl? or that of Linux HA clusters?

For perl - if you want to have HA perl processes, one idea that comes to mind is using POE and register a watchdog session in each process on the cluster members.

For interfacing with Linux cluster management - as mentioned, system to interface with binaries, or IPC::Open2 or IPC::Open3. Or POE again, using POE::Wheel::Run. I don't know whether there are C libraries for cluster management or (XS) perl modules which implement an interface to those.

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