Technical notes

This is a collection of technical notes I wrote. They are nothing more than scraps I revise from time to time, so do not expect anything complete or exhaustive. I use them mainly as a quick reference when I need to. Any feedback is always appreciated.

System administration

RAID

• Upgrade your system to software RAID 1/4/5

Security

TLS

• Managing self signed SSL certificates

DNS

• TSIG transaction security in bind