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There are many questions on server tuning and security checklist are being closed.

So, I am not asking for the exact detail.

Please point me to the resources you find it is helpful (no matter web server, db server etc) and worth reading (and still relevant, e.g. no more RedHat 6).

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closed as not constructive by ceejayoz, voretaq7 Feb 25 '13 at 18:31

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

If you can write an entire book (or series of books) on a subject, it's not something that can be answered in a single ServerFault question. – ceejayoz Feb 25 '13 at 15:57
I would suggest perusing security and our Information Security sister site. The reason these questions are being closed is because it is impossible to provide a good, general answer to them. Security is not a product - it is a state of mind and an approach to designing systems. You need to determine the steps required to build and maintain secure systems based on your environment and requirements. – voretaq7 Feb 25 '13 at 18:30
up vote 1 down vote accepted

You can start with the CIS Security Benchmarks for the specific Linux distribution you plan to use.

Here is the CIS Red Hat Enterprise Linux 6 Benchmark v1.1.0.

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