System Administrator Jobs: Windows, Linux and Server Management Explained

The short version

System administrators keep an organisation's computers, servers and user accounts running smoothly. When everything works, nobody notices. That is the sign of a good sysadmin.

What the job involves

• Creating and managing user accounts, groups and permissions
• Installing, patching and updating servers and workstations
• Monitoring performance, disk space and uptime
• Managing backups and testing that they can be restored
• Handling email, file servers, printers and directory services
• Writing scripts to automate repeated work
• Responding to incidents and documenting fixes

Skills to build

• Windows Server and Active Directory basics
• Linux administration: users, permissions, services, logs, package management
• Command line and shell scripting; PowerShell for Windows
• Networking fundamentals
• Virtualisation: VMware, Hyper-V or similar
• Backup and recovery concepts
• Basic security: patching, least privilege, antivirus and logging
• Cloud basics, as many servers now live in the cloud

A hands-on lab to start

1. Install a virtualisation tool on your computer.
2. Create one Linux and one Windows virtual machine.
3. Create users and groups, and set file permissions.
4. Install a web server on Linux and open the right port.
5. Write a script that checks disk space and writes a daily report.
6. Practise breaking and fixing things, then document the fixes.

Interview questions

• How do you check which process is using high CPU on Linux?
• What is Active Directory and what is a group policy?
• Explain file permissions in Linux
• How do you check disk usage and clean it up safely?
• What is your backup strategy for a critical server?
• How do you patch servers with minimal downtime?

Career path

Support engineer, then system administrator, then senior sysadmin, then systems engineer or architect. Many move into cloud engineering, DevOps or security by adding automation and cloud skills.

Next step

Build the lab above this month. Register on JobKarle and apply to system administrator and support roles.