S5 is an abbreviation for Snap Serv Server Stack Script. Basically it is meant for setting up a fresh Debian Wheezy x86/x64 system. You can read everything it does in config.sh, which is an example config. Remember to adjust to example configuration to some sane values.
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Connect to your fresh server
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Adjust network configuration if necessary
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Download s5.sh and config.sh into /root: