My howtos and tuning for a lot of things that I've worked in my 20 years of *nix environment.
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linux
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solaris
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freebsd
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osx
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firewall
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mail server
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router, AS, BGP
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DNS
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mySQL
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noSQL (aerospike, memcached, redis)
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webserver ( nginx , lighttpd, apache )
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python
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perl
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PHP ( everyone has a dark side )