Linux

40 skills in 11 steps, from “Use a terminal” to “Harden a Linux server against a baseline”.

Start · Run commands and read their output in a shell All skills

40 skills to acquire in this domain
11 steps in the order you learn them
0/40 acquired from your progress, in this browser
0 prerequisite domain to know before starting here

Your path

The domain's steps

In the order you learn them: each step builds on the previous one. Your status is computed in your browser, from what you have read and passed (quizzes, labs).

1

Use a terminal

1 skill
See the 1 skill
- Run commands and read their output in a shell 6 lessons · ~4 h 40 · then its quiz
2

Work on a Linux system

6 skills
See the 6 skills
- Install a Linux system and identify its distribution 7 lessons · ~4 h 00 · then its quiz
- Find your way around the tree and handle files and text from the command line 13 lessons · ~9 h 05 · then its quiz
- Use Bash efficiently: variables, expansions and a first script 6 lessons · ~3 h 40 · then its quiz
- Manage users, permissions and processes 7 lessons · ~4 h 00 · then its quiz
- Install and maintain software 5 lessons · ~2 h 10 · then its quiz
- Troubleshoot the network and read the logs 5 lessons · ~2 h 20 · then its quiz
3

Run a Linux server

2 skills
See the 2 skills
- Administer a systemd service 6 lessons · ~4 h 10 · then its quiz · a lab
- Access a machine over SSH 5 lessons · ~2 h 50 · then its quiz
4

Administer a Linux server

8 skills
See the 8 skills
- Monitor processes and performance 9 lessons · ~5 h 15 · then its quiz
- Automate in the shell and schedule tasks 10 lessons · ~6 h 00 · then its quiz
- Configure and troubleshoot a server's network 11 lessons · ~8 h 00 · then its quiz · a lab
- Prepare local storage: disks, partitions, file systems and mounting 15 lessons · ~10 h 15 · then its quiz
- Manage logical volumes, software RAID and disk encryption 6 lessons · ~4 h 50 · then its quiz · a lab
- Mount network storage: NFS, SMB and iSCSI 3 lessons · ~2 h 30 · then its quiz
- Maintain a server's software and monitor its resources 14 lessons · ~7 h 35 · then its quiz · a lab
- Troubleshoot a Linux server 7 lessons · ~5 h 20 · then its quiz · a lab
5

Secure a Linux system

3 skills
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- Manage a server's accounts and delegation: users, groups, LDAP directory, sudo and ACLs 5 lessons · ~5 h 00 · then its quiz · a lab
- Filter a server's traffic with a host firewall, NAT included 6 lessons · ~4 h 15 · then its quiz
- Run a server under SELinux or AppArmor: modes, contexts and troubleshooting 3 lessons · ~3 h 20 · then its quiz · a lab
6

Process text and files on the command line

5 skills
See the 5 skills
- Build a pipeline that extracts, sorts, counts, compares and follows a text stream 5 lessons · ~3 h 00 · then its quiz
- Transform files and streams with sed, awk and regular expressions 4 lessons · ~2 h 00 · then its quiz
- Edit a configuration file in Vim: modes, motions, substitution 1 lesson · ~30 min · then its quiz
- Download a file and check its integrity and authenticity 2 lessons · ~1 h 00 · then its quiz
- Back up and restore a directory tree with tar 1 lesson · ~30 min · then its quiz
7

Customize your working environment

2 skills
See the 2 skills
- Customize your shell or adopt another one (Bash, Zsh, Fish) 3 lessons · ~1 h 30 · then its quiz
- Configure your terminal editor and its plugins (advanced Vim, Neovim, Micro) 3 lessons · ~1 h 20 · then its quiz
8

Manage packages and reproducible environments with Nix

2 skills
See the 2 skills
- Install Nix and manage packages with profiles and generations 5 lessons · ~2 h 30 · then its quiz
- Describe a reproducible environment in Nix: shell.nix, flakes and NixOS configuration 6 lessons · ~3 h 00 · then its quiz
9

Isolate and limit processes with the kernel

1 skill
See the 1 skill
- Limit and isolate a process with cgroups, namespaces and capabilities 5 lessons · ~2 h 50 · then its quiz
10

Trace and harden the kernel with eBPF

2 skills
See the 2 skills
- Trace the Linux kernel live with bpftrace: choose a probe, write a one-liner and aggregate into counters and histograms 2 lessons · ~1 h 15 · then its quiz
- Restrict and audit eBPF on a server: block unprivileged loading, delegate CAP_BPF, harden the JIT and inventory loaded programs 3 lessons · ~1 h 55 · then its quiz
11

Harden a Linux server against a baseline

8 skills
See the 8 skills
- Measure a server's gap to a hardening baseline and prioritize the measures (ANSSI-BP-028, CIS) 2 lessons · ~1 h 05 · then its quiz
- Harden a server's access and privileges: SSH, PAM, sudo, permissions and scheduling 5 lessons · ~2 h 05 · then its quiz
- Harden boot, mounts and the local session: GRUB, nodev, nosuid, noexec, banners, dconf 4 lessons · ~1 h 30 · then its quiz
- Harden the running kernel: persistent sysctl parameters and blocked modules 2 lessons · ~1 h 00 · then its quiz
- Confine a service: mandatory access control (SELinux or AppArmor), then systemd sandboxing 2 lessons · ~2 h 30 · then its quiz · a lab
- Trace who did what on a Linux server with auditd: persistent rules, ausearch and aureport 1 lesson · ~55 min · then its quiz
- Rebuild a KSPP-hardened kernel and prove its options at boot 1 lesson · ~25 min · then its quiz
- Harden a NixOS server declaratively: versioned measures, test before switching, runtime checks and rollback to a healthy generation 2 lessons · ~1 h 15 · then its quiz

The domain's steps

Use a terminal

Work on a Linux system

Run a Linux server

Administer a Linux server

Secure a Linux system

Process text and files on the command line

Customize your working environment

Manage packages and reproducible environments with Nix

Isolate and limit processes with the kernel

Trace and harden the kernel with eBPF

Harden a Linux server against a baseline