Category: Linux Micro Server Projekt

Postfix: Automatic UFW Firewall Updates

If you use a Mail Server with Postfix you got daily Spam Attacks by Scripts: How to fix? Install ufw Firewall Run a Scanner Script as  cronjob On Debian/Ubuntu: Install ufw: sudo apt-get update && sudo apt-get install ufw && sudo ufw enable && sudo  ufw logging off Scan Script: sudo nano /home/user/firewall-update.sh: #!/bin/bash # scan rejected cat /var/log/mail.log | grep rejected | cut -d"[" -f3 | cut -d"]" -f1|grep -v '^$' > /tmp/firewall.txt # insert to Firewall while read line; do sudo ufw insert 1 deny from $line to any; done < /tmp/firewall.txt # scan "denied" cat /var/log/mail.log | […]

Raspberry Pi: Raspian disadvantages of embedded OS

The last 12 month have been a “golden” time of the upcomming embedded linux devices, but the custom OS’s offers some problems, you should know for projects: embedded PC’s like the ARM based pi2 / pi3 uses a own compiled OS not every known debian package is available not all compile scripts to rebuild are available on git slow performance can let you run into unuseable problems (heat, load, I/O), correct written scripts run into freezes without any error made by you! you should take time for a closer look at buying them calc the costs of non-x86 systems, later […]

Security: Webserver HTTPS with Self Signed Certificate Do it yourself in 5 Minutes!!

Today the Point of Security and encrypted Webserver Communication is rolling over every User who hosts own Websites on the Internet. Last decades HTTPS was only used by Online Login Pages like Shops and Banks to verify the Communication between a User PC and the Website. But after January 2015 the most Search Engines like google decides to force index of Websites with HTTPS Protocol. The Background is that a TLS encrypted Connection isn’t easy to track and to force “drive-by-load-Viruses” to the Website Visitors. But a lot of Webmasters of the Opensource Community were angry about this handling. Thats […]

Hardware Tip: “Null Euro” entkoppelte Festplatte (“Zero Dollar” Hard Drive acoustic decoupling)

Problem: Festplatten brummen in PC Gehaeuse, Schwingungen werden uebertragen. Harddrive rotations transmitted by case parts and acousitc boosted up Professionelle Produkte zum entkoppeln kosten bis 30 Euro. Professional Parts must be paid up to 40 Dollars/Drive Lösung:  “Null Euro” Lösung – “Zero Dollar” Solution Festplatten im 5.25 Zoll Laufwerk auf Einmachgummis haengen Harddrives mounted on grommets of old botteling jars