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Linux: Monitor a Service with a Watchdog Script

May 18, 2010, 19:32 (0 Talkback[s])
(Other stories by Gene Alexander)

[ Thanks to Gene Alexander for this link. ]

"Old Unix hands already know this, but new Unix (Linux) users may be asking, 'What is a "watchdog script"?' Basically it is a bash or other script that is run via cron periodically to check on a persistent service. The watchdog script takes actions based on the state of the service it monitors.

"There are other examples of watchdog scripts on the internet. Just search for them using your favorite search engine to see them. Following is a watchdog script we created recently for a client to monitor an e-mail to pager system my company wrote for the client. Here is the script (with sensitive bits changed to protect the innocent):"

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