Let’s Encrypt for Apache on Ubuntu (14.04 or above)

Last time we covered Purchase certificate from traditional CA.
Now with Let’s Encrypt, we can request free certificate, and install/renew them automagically.

Updated Aug 2018: Install from PPA is now required as version in Ubuntu repository no longer works

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[Windows/Mac/Linux] Password-less SSH Access and Hints

To access SSH without entering password every time.
You can generate a public/private key pair, and authorize the public key on remote server.
Essential if your need to run automated scripts.
Works on Linux / Mac / Windows (Under bash)
(For Windows + PuTTY, check the tutorial here)

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