Run grep denied /var/log/auth.log.
grep denied /var/log/auth.log
Mission 286
Incident suspicious login
Search auth evidence and SSH policy together.
Troubleshootinggrepjournalctl
Lesson 286 of 360
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Troubleshooting · 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 journalctl -u ssh -n 2.
journalctl -u ssh -n 2
Run grep PermitRootLogin /etc/ssh/sshd_config.
grep PermitRootLogin /etc/ssh/sshd_config
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Lesson support
What to notice while you play.
Search auth evidence and SSH policy together.
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.
grep [-i] <text> <file>
Find literal text inside a file.
journalctl -u <service>
Read simulated service journal entries.