updated webserver guide to debian buster

content/fundamentals/webserver.md

@@ -39,7 +39,7 @@ So in essence the web is a network of webservers which runs on top of the intern
 - Have an available power socket next to your router.
 - An ethernet cable to connect your server to the router.  
 
-The instructions on this guide were run on a Debian Stretch distribution.
+This guide assumes Debian stable (Buster) running on the server.
 
 ## Installing Apache
 
@@ -185,18 +185,13 @@ As part of its bigger goal to "encrypt the entire Internet", the [Electronic Fro
 
 Let's get down to it! Again, these instructions are specific to Debian 9 (Stretch), but detailed instructions for installation on other distributions can be found on [Certbot's website](https://certbot.eff.org/instructions)
 
-First, add backports to your packages list and update it:
 
-```bash
+First, let's install Certbot:
-$ echo deb http://deb.debian.org/debian stretch-backports main | sudo tee -a /etc/apt/sources.list && sudo apt update
-```
-
-Now, install Certbot:
 
 ```bash
-$ sudo apt install certbot python-certbot-apache -t stretch-backports
+$ sudo apt-get install certbot python-certbot-apache
 ```
-Run Certbot to get the right certificates for your domain:
+Now, run Certbot to get the right certificates for your domain:
 
 ```bash
 $ sudo certbot certonly -d myserver.org
@@ -268,19 +263,13 @@ $ sudo a2enmod ssl
 
 ### Certificate renewal
 
-Your certificates expire after a period of time. You can, however, automate renewal by adding a [cron job](https://www.ostechnix.com/a-beginners-guide-to-cron-jobs/) that schedules when the specific renewal command should be run.
+Your certificates expire after a period of time. However, the Certbot packages on your system should come with a [cron job](https://www.ostechnix.com/a-beginners-guide-to-cron-jobs/) or a [systemd timer](https://wiki.archlinux.org/index.php/Systemd/Timers) that automatically renews them before they expire. This will be installed in one of the following locations:
 
-Start by running:
+* /etc/crontab/
-```bash
-sudo crontab -e
-```
 
-Add the following:
+* /etc/cron.*/*
-```bash
-55 5 * * 5  /usr/bin/certbot renew
-```
 
-This means the certificates will be renewed every week on Friday at 05:55. You can of course edit these times according to your preferences!
+* systemctl list-timers
 
 Save your changes and exit the editor.  
 Time to restart Apache and load all of these changes!