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Steve Shah, author of a Red Hat administration book, provides some advice on configuring Linux servers and recalls some of the common mistakes he's run into.
The most frequent source of 'uh-oh' problems that I see revolve around changes that don't have an immediate 'Yes, this worked,' kind of feedback. This includes the likes of editing boot-time scripts/configurations and backups. Both of these require some additional test after the action to see if the change worked where the additional test is not trivial.
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