1 Prerequisites This skill 17 Unlocked

Skill · Linux · Run a Linux server

Access a machine over SSH

Connect to a server over SSH with an Ed25519 key, organize ~/.ssh/config, configure sshd without locking yourself out, run remote commands and open tunnels.

Start lesson 1The Linux domain

• 5 lessons
• ~2 h 50 of reading
• 5 quizzes
• 0 proof lab

The path

Where it comes from, where it leads

What you need to know first, where you stand on this skill, and what it opens next. Your status is computed in your browser, from what you have read and passed.

Before · 1 prerequisite

• Find your way around the tree and handle files and text from the command line

This skill, for you

Access a machine over SSH

Computing

It unlocks · 17 skills

• Prepare managed nodes and run ad hoc commands
• Write a Chef cookbook and converge it idempotently, in a container then on a VM
• Run a fleet with a CINC server: enrollment, search, policy groups, pull mode
• Set up Rudder and apply a first rule to a group of nodes
• Drive a fleet remotely with Salt: master, minions, keys and targeting
• Host a Git repository on your own server and transfer it offline
• Make the control plane of a kubeadm cluster highly available
• Harden a cluster's components with the CIS Benchmark
• and 9 others

  • Install a Kubernetes cluster
  • Troubleshoot the control plane and nodes
  • Upgrade a kubeadm cluster by one minor version
  • Confine a container against the host kernel (seccomp, AppArmor)
  • Isolate a Pod in a sandboxed runtime (RuntimeClass)
  • Harden a server's access and privileges: SSH, PAM, sudo, permissions and scheduling
  • Manage a server's accounts and delegation: users, groups, LDAP directory, sudo and ACLs
  • Filter a server's traffic with a host firewall, NAT included
  • Automate a fleet's administration from Python: SSH, deployment and network scanning

Lessons

How to learn it

5 lessons, about ~2 h 50, in program order. Each lesson ends with its quiz.

The program

5 lessons · ~2 h 50

1. 1Create and manage SSH keys· 50 min
2. 2Connect over SSH: the OpenSSH client guide· 30 min
3. 3Configure the OpenSSH server (sshd) for LFCS/RHCSA· 30 min
4. 4Run remote commands over SSH· 30 min
5. 5SSH tunnels: -L, -R, -D and ProxyJump· 30 min

Beyond the lessons

Assess, practise, pass the proof

Reading a lesson confirms nothing. A skill is confirmed by a passed quiz, practised in a guided lab, and put to the test by a challenge or a mission; an imported lab result is not verified by the site.

Assess yourself

5 quizzes

At the end of the lessons: passed at 70%, they confirm the skill.

Practice

1 guided lab

• Set up hardened key-based SSH access for a service user

Proof

No proof

Neither a challenge nor a mission with a proof yet.

Around it

Who requires it, who teaches it

Required by

• Linux Administrator
• LFCS
• RHCSA (EX200, RHEL 10)

In red: the certification it prepares for.

Taught by

• Linux Training

Same block · Run a Linux server

• Administer a systemd service

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