Waterfall used to be such a predominant collaboration model in software development, that I learned it on textbook in University. Numerous advocacies arose to challenge…
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,…
A common devops task is build logging pipeline with ELK stack (Elasticsearch, Logstash, Kibana). Suppose the application is written in Java and currently use log4j’s…
Update 2023: the practice outlined in this post has been outdated.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…
Back in the days, in the absence of handy automation tool, I used to install 40+ servers all manually, following exact same sequence of steps…