System tweaks
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SSH tweaks:
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increased connection timeout
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sysctl tweaks:
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Increased file descriptor limit
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Increased inotify limit
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Enabled execshield
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Network stack tuning (increased TCP buffer size, queue for input packets, selective logging, reverse path filtering, no routing modifications, prevent TCP time-wait attacks, prevent SYN attacks, etc…)
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Discourage swapping idle processes
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Bash tweaks:
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readonly HISTFILE
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readonly HISTIGNORE
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don’t ignore commands
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increased HISTSIZE
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A swap file has been added
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Improved I/O scheduler and I/O related tweaks