kenshin

Redis as cache backend has been supported in #43 . However, the features mentioned by @ctr49 still need more works. Will keep the PR as open status.

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@robcza ,I will try to update this as soon as possible. However, i am worry i can't give you an specific date now, a plenty of heavy work recently.

Thanks for pr @bn0ir . I have a doubt, why don't use the current file backend log system as an audit log directly instead of developing an alternative audit log...

Thanks for your detailed explanation. I believed the audit log is reasonable and valuable in your case. However, I hope the implementation of Redis backed or PG backed can be...

I have not yet deep thinking the implementation of how to defend DoS attack in godns. Obviously, you have mentioned the right direction. I modified the title from `Limit request...