Enable the PHP opcache
Get started with using the codesniffer tool in order to ensure your code adheres to the PSR-2 standards.
Install PHP Pear
Deploy your own private satis server for private PHP packages.
A workaround for removing a domain in AcmePHP.
Install the the ceph-deploy tool for the latest LTS version of Ceph, on the latest version of Debian.
A short guide on creating a GPG master key, before then creating subkeys for it.
A short post on GPG subkeys and why you should use them.
Link your Yubikey with GPG
Change the mode of your Yubikey so that you can use it for PGP/GPG as well.
Fix graphics appearing in the subject line in Thunderbird
See how you can use your Yubikey to SSH into remote servers using a pin code.