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LINUX: Upgrading a production machine

Our production machines are running on debian etch. Now, they finally released lenny, the day will come we need to upgrade these systems. How can I do this with minimal risk? Are there any premises, preparations of fall-back scenarios and do I need a plan B in case something goes wrong? Besides the binary packages handled by the debian installer there are a couple of compiled applications running on the machines.

http://stackoverflow.com/questions/636394/linux-upgrading-a-production-machine

http://tldp.org/LDP/LG/issue36/defurne1.html

February 2014
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