The Spamhaus Project
cloudibee I have nothing but the utmost respect for the Spamhaus project. What is Spamhaus? For those who don’t know I wll reproduce the quote from its web site: “Spamhaus tracks…
Linux
Secure your Apache Configuration and IPTables: Blacklists
20 ways to Secure your Apache Configuration This is a pretty good basic/intermediate Howto written by Pete Freitag, who is a software engineer, and web developer from central New York.…
How to format external USB Drive to Fat 32
When I purchased my first external USB drive, I wanted immediately to add it to my Linux system. Yet, no matter how hard I tried, rebooting my hard drive over…
How to set up Squirrelmail (Webmail) and configure Sendmail
Ok, so you installed and set up Sendmail and Dovecot and they are working in sync without any problems. What’s next? Here comes webmail. If you don’t want a workhorse,…
Dovecot’s Miracle and Do You Wanna… Samba?
Miracle software with a simple name Dovecot Over the years I used Dovecot as a companion for Sendmail. It is getting better with the time. In early versions I had…
Linux commands, Bind Configuration and Free DNS Tools
Linux Commands If you need to find out quickly what a certain Linux/Unix command means, this manual comes really hand. It will provide you with all commands from A to…
Identifying SSL Certificate Algorithm using nmap and openssl command
SSL certificate signature algorithm can be identified using nmap or openssl command. Here are the steps to identify SSL certificate algorithms used in your webserver or other SSL endpoints. nmap…
Disabling TLS 1.0 on Apache Linux Server
TLS 1.0 is end of life on June 30, 2018. To disable TLS 1.0 on Apache webserver installations, edit the “SSLProtocol” directive in your ssl.conf (typically /etc/httpd/conf.d/ssl.conf), where the ciphers…
Linux Performance analysis tools
Understand how various Linux performance monitoring tools behave when the system is heavily loaded in terms of cpu, memory and swapping to disk (IO).
Linux performance tuning – vm.swappiness
vm.swappiness takes a value between 0 and 100 to change the balance between swapping applications and freeing cache. At 100, the kernel will always prefer to find inactive pages and…
Linux: CPU hammer stress testing script
Here is a simple shell script to load & hammer the CPU using awk. The script does simple recursive mathematical calculations and thus CPU load peaks up on higher values…
Linux networking Using NMCLI
Linux networking and bonding using nmcli
Linux Performance Observability tools diagram
linux performance tuning, linux, performance
NetApp performance monitoring : sysstat – Part I
NetApp performance monitoring
Linux Network bonding – setup guide
Linux network bonding setup guide with detailed explanation of steps and bonding modes