Nagios, a pioneer in IT monitoring since 1999, remains a reliable choice due to its plugin-based architecture and robust notification system. While highly customizable, it has an outdated UI and requires manual configuration. Competitors like Zabbix offer better scalability and a modern interface, while Prometheus excels in cloud-native monitoring. Choosing the right tool depends on an organization’s needs—Nagios for stability, Zabbix for enterprise scalability, and Prometheus for dynamic cloud environments.

Terraform automates infrastructure deployment using code, ensuring consistency and scalability. Key commands like init, plan, apply, and destroy simplify cloud management. With multi-cloud support and HCL syntax, Terraform is a top choice for IaC in DevOps.