Run ss -tulpn.
ss -tulpn
Mission 267
Listener ownership
Map listeners to processes and service state.
Networkingsslsofsystemctl
Lesson 267 of 360
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Networking · 8 minutes
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learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
8 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run lsof -i.
lsof -i
Run systemctl status nginx.
systemctl status nginx
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Lesson support
What to notice while you play.
Map listeners to processes and service state.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
- Skipping the inspection step.
- Assuming one command tells the whole story.
Reference
Commands in this lesson.
lsof
Show simulated files and sockets opened by services.
systemctl status <service>
Inspect simulated service status.
ss|ip
Inspect simulated sockets and addresses.
ssh|scp|ssh-keygen
Practice SSH inspection and dry-run transfer shapes without network access.