When speaking about memory there are a few concepts that I had to wrap my head around. I’m hence putting them together for future reference.…
Kernel introduction Linux system is composed of three main bodies of code, in line with the most traditional UNIX implementations: Kernel: The kernel is responsible…
Tools to manage firewall Packet filter rules in Linux Kernel is managed by an user-space application named iptables in CentOS and RedHat. Since CentOS 7,…
Update 2023: the practice outlined in this post has been outdated. This post is for archive ony. One of the reasons I prefer CloudFormation over…
Most of the text processing can be processed by awk and sed. Sed is non-interactive stream editor that allows you to specify all editing instructions…
Cron and anacron We all know cron is a job scheduler. Many admin uses crontab to manage scheduled task. It is also important to know…