- Linux Shell, CLI, Bash scripting system, Nginx/Apache, DNS, log analysis

- Pure CLI prompt, no tools to be used to perform Linux tasks

- Linux OS installation/troubleshooting, kernel tweaking, hardening and OS log analysis

- Linux filesystem knowledge - types of file systems and their aspects, tweaking file system for specific purposes, etc.

- Managing Linux system users, user rights, IPTABLES/Firewall, SELINUX, HIPS etc.

- Server troubleshooting - load troubleshooting, iOS tat, process- tracing, etc.-network-level troubleshooting

- Knowledge of networking - routes, IPv6, subnets

- Setting up/full knowledge of Web technology - DNS, HTTP server setup, Load balancing, etc.

- L7 security concepts and good awareness of security

- Utilities/Programming: awk, Sed, shell scripting, ansible, Nagios- setup, etc.

- Knowledge of Database clusters - MySQL, MongoDB, Elasticsearch, ELK, Redis etc.

- Jenkins, Gitlab etc.

- Docker/K8 setup