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The Official Ubuntu Server Book by Benjamin Mako Hill, Kyle Rankin

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Chapter 8. Monitoring

A SERVER IS NOT VERY USEFUL if it’s down. If you have skipped ahead and read the Fault Tolerance chapter (Chapter 10), you are well aware of the lengths to which some administrators go to ensure that a service stays up. No matter how much work you put into your environment, though, eventually a service or server will go down. When that happens, you want to make sure that you are alerted. If it’s your job to maintain a server, it’s embarrassing if someone else has to come to you with the news that it’s down—that’s something you should be the first to know. Getting alerts is only one aspect of monitoring, though. In addition to getting alerts whenever a service goes down, you should also monitor the overall health ...

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