Signal9Signal9 — home
online

Scenario library

Rooms

Multi-task scenarios on a single live box. Each room chains objectives so you practise a whole workflow, not one command.

Room progress

3/35 tasks

1 of 4 rooms started
3/35 tasks9%

32 tasks remaining

Filter and sort rooms

Topics

4 of 4 rooms

Your filter and sort choices are saved for next time.

Use the arrow keys to move between rooms. Home and End jump to the first and last room.

  • MediumIn progress

    Hardening Bastion

    Lock down SSH, sudoers and SELinux booleans on an exposed jump host.

    • ssh
    • selinux
    • sudo
    3/9 tasks33%

    6 tasks remaining

    Resume room — Hardening Bastion
  • Easy

    Disk Full at 03:00

    Triage a paging alert: find the runaway log, reclaim space, keep the service up.

    • triage
    • disk
    • logs
    0/7 tasks0%

    Not started · 7 tasks

    Enter room — Disk Full at 03:00
  • Hard Locked

    Broken Boot

    Recover a box that drops to emergency mode after a bad fstab edit.

    • boot
    • fstab
    • recovery
    0/11 tasks0%

    Not started · 11 tasks

  • Medium Locked

    Package Forensics

    Track down which RPM shipped a tampered binary and verify the rest of the system.

    • rpm
    • forensics
    0/8 tasks0%

    Not started · 8 tasks