This is a relatively simple request when the server is under your desk: boot a rescue disk, use a tool like shred to wipe the data on all the hard drives, then press the power button. When the server is in a remote data center, it's a little more challenging: use a remote console to reboot into a rescue disk, wipe the server, then remotely pull the power using some networked PDU. When, like me, you have to wipe a server thousands of miles away with no remote console, no remote power, no remote help and only an SSH connection, you start scratching your head.
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