Cloning a Debian Etch system for redundency
I am responsible for a production web server that is very critical to our clients and the bread and butter of our company. We have collocated the server, for reliability of power, A/C and Internet connectivity as well as cost effective high bandwidth. Here we'll describe how to make that more redundant with the configuration, identical, machine.
For real peace of mind, we lease two identical server boxes from our collocation provider and with a "private rack" option, the two machines can be configured with Internet addresses from the same subnet, so that one can easily take-over for the other. In addition, the two machines are connected via a private local network, handy for mirroring.
For this take-over to be useful, the standby machine needs to be a relatively current copy of the production machine. It turns out that this is a fairly simple 3 step process, but step 2 is not obvious. Here is the process that we have recently developed and tested.
Our configuration is: two identical machines
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