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Sorry about the examples, the general idea is that you can execute a command on the server when there are alerts for a specific problem. Upstart and daemontools can't keep your processes running. For this specific task there are tools like Monit, God, Puppet to some extend

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Perhaps a better example would be automating a previously manual failover, i.e. if a service becomes unavailable on one machine, start it on the warm standby. Or in EC2, terminate an instance and start a new one.

Upstart can indeed keep your process running. We use it for all of our process monitoring and it works like a charm.

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