Tracks

First steps

From system basics and command input to navigation, files, text, and pipelines.

You are new to the Linux terminal.

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Users, permissions, and processes

From file permissions and accounts to sudo, groups and processes.

You'll need: navigation, files and the terminal.

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Packages, services, and logs

From packages and systemd services to your own unit, the journal, schedules and log rotation.

You'll need: the terminal, files, permissions, sudo and processes.

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Networking

From addresses and routes to ports, filtering, DNS, SSH and multi-host connectivity.

You'll need: the terminal, files, sudo and service management.

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Storage

From space diagnosis and mounting, through preparing a new disk, to logical volumes and data recovery.

You'll need: files, permissions, sudo and service management.

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Bash: text processing and scripts

Searching and editing text with grep, sed and awk, your own scripts with arguments and checks, exit codes and scheduled runs with a log and a lock.

You'll need: the terminal and pipelines, file permissions, systemd services.

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Inside the system: resources, kernel, processes

Load average and the CPU, memory and the OOM killer, process limits and kernel parameters, disk load, strace and /proc, kernel messages, the system boot and time synchronisation — up to triaging a slow server.

You'll need: processes and signals, services and logs, filesystems.

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Web stack

Sites and reverse proxy on nginx, certificates and HTTPS, PostgreSQL access and restoring from a dump — up to a site and a database on two machines.

You'll need: services and logs, ports and curl, networking between two machines.

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Server security

What a server exposes and what it keeps running after an update, password policy and fail2ban, a service with least privilege, AppArmor and auditd — up to getting a new server ready for publication.

You'll need: services and logs, networking and SSH, users and permissions.

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Containers: Docker and compose

Image and container, ports, environment and restart, your own Dockerfile, volumes, container networking and a compose stack, memory limits and the user inside a container.

You'll need: services and logs, ports and curl, file permissions.

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Automation: Git and Ansible

Configuration under git: who changed what, how to get the working version back and update a server from a repository; Ansible: inventory, ad-hoc commands and an idempotent playbook — up to configuring a second machine from the first.

You'll need: Bash and scripts, networking and SSH.

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