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Introduction to Linux Server Administration!

This includes all the source material for the 20 lessons of what was previously a commercial online Linux server admin course - now free for you to learn with! (If you spot any typos or "dead links" simply raise a GitHub "issue").



Table of Contents

  • Day 0 - Creating Your Own Server: how to setup your lab in AWS, Azure, Google Cloud, Digital Ocean and others
  • Day 1 - Get to know your server: Starting with ssh-ing in and some simple commands like: ls, uptime, free, df -h, uname -a. Extensions on doing passwordless login with public keys and and an ssh config file.
  • Day 2 - Basic navigation: Basic navigation, the "man" pages, file hierarchy
  • Day 3 - Power trip!: Working with sudo, uptime, timezones, changing your hostname
  • Day 4 - Installing software, exploring the file structure: Using 'apt' to find and install software. Use of mc to explore the filesystem. Looking at the contents of: /etc/passwd, /etc/ssh/sshd_config and /var/log/auth.log
  • Day 5 - More or less...: Using more, less and navigating in these. Dotfiles, history, tab completion, and using the nano txt editor
  • Day 6 - Editing with "vim": Learning vim, the minimal knowledge, but also via vimtutor
  • Day 7 - The server and its services: Installing Apache2, stopping and starting, altering the content, reading logs
  • Day 8 - The infamous "grep" and other text processors: Hands-on with text tools like grep, cat, more, less, cut, awk and tail - and piping of course. (and a wave to awk and sed)
  • Day 9 - Diving into networking: Looking at open ports with ss, and a nod to netstat, install nmap and test. Install ufw, set up, enable and test etc. Discuss security resonsibilities as the sysadmin.
  • Day 10 - Getting the computer to do your work for you: Covering cron, at, and systemd timers
  • Day 11 - Finding things...: Finding things with: locate, find, grep, which
  • Day 12 - Transferring files: SFTP, the technology, clients, and copying up and down
  • Day 13 - Who has permission?: Permissions, users, groups, (ACLS and SELinux in the Extension)
  • Day 14 - Users and Groups: Using adduser, visudo to setup up a restricted "helper" to manage our host
  • Day 15 - Deeper into repositories...: Repositories in more detail, how to enable "Multiverse", the role of PPAs in Ubuntu, enabling and installing from them
  • Day 16 - Archiving and compressing: Understanding and using tar and gzip
  • Day 17 - Build from the source: Installing from source. Discussion, using wget to get a tarball, tar to extract and then configure, make and install. Discussion of security, maintenance issues.
  • Day 18 - Log rotation: Log management and rotation, logrotate
  • Day 19 - Inodes, symlinks and other shortcuts: Inodes, hard links symlinks and stat
  • Day 20 - Scripting: Understanding how scripting work in Linux, the shebang, permissions and $PATH. A couple of simple sample scripts based on the filtering of logs we've been doing. Resources to explore further.
  • Day 21 - What's next?: Closing the course with some suggestions.

You are free to use this under the terms of the license, but copyright remains with the author, Steve Brorens.


Learn the skills required to sysadmin a remote Linux server from the commandline.







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