APC Back UPS 700 on Ubuntu 1804

Having an uninterruped power supply for my server is important. I use an inexpensive one: The APC Back-UPS BX 700 and it works well. If I had to buy a new one, I'd use the one with the proper Schuko-connection for Germany. The so called "Kaltgeräte...

Migrate your letsencrypt certbot files

Running your webserver over https is so much easier nowadays thanks to letsencrypt.

How do you move your certificates to a new server? Simply copy your ./etc/letsencrypt folder.

Just pay attention to preserve the links.

Install Ubuntu 18.04 Server on btrfs

Btrfs is an advanced file system. It supports compression, keeps checksums on every block and you can make snapshots.

Why btrfs?

Checksums

Hard disks and SSDs are physical devices that can break. A bit can flip and a 0 becomes a 1. It's rare and...

Stress test your webserver with siege

Stress testing your webserver to find out if it can handle the load of hundreds of users at the same time.

Install and run siege on a computer with lots of bandwidths and you get nice statistics.

Refactoring old PHP code

PHP was a brilliant language in the early 2000s and I had tons of fun writing business applications and fun projects with it. Unfortunately the code did not age well.

It was easy to hack stuff together and I guess that's the reason why php has such...