DevOps in 21 Days!
About Me
Disclaimers
- Work in progess
- Subjective
- Interactive
Prerequisites
- Good English (or not)
- Programming
- Problem Solving
- Googling
- Prompt engineering
Tools and techniques
- Learning by doing
- Iteration
- Document as you go
- Ask for help
- Give back
Day 1
- Get a linux box
- Use a VM
- Don’t use VBox/VMware WS
- Vagrant is better
- SSH into the machine
- Picnic 101 (file manipulation, power management, search, pagers, text editors …)
- Install a something (e.g. nginx).
- Package Management 101 (apt, yum, pacman)
- Service Management 101 (systemd)
- Expose 80 port to your machine.
- Access the something (nginx).
Homework
- Use Cloud
- SSH 101
- OpenSSH
- Asymetric cryptography
- Password vs Key based Authentication
- Study Introduction to Linux from tuxcademy.
Bonus
- Read a book about DevOps.
Day 2
- Read about UNIX, shells, POSIX,…
- Write your first script.
- Learn bash basics (variables, conditionals, loops, args, …)
- Git 101
- git init
- git add
- git commit
- git log/show
Homework
- Version you script and push it to gitlab/github
- git init/clone
- git remote
- git push/pull
Bonus
- Watch some Geeksblabla’s episodes about Linux and DevOps …
Day 3
- RegEx 101
- Unix Filters: pick a file and play
grep: get a [dictionary](english corpus inurl:gist.github.com)(/usr/share/groff/1.22.4/eign)cut/paste: get a csv file- sort, uniq, tr, head, tail, wc, split, tee …
- learn pipes and redirections
Homework
- RTFM
- Try
cht.sh - Study Advanced Linux: The Linux Shell and Toolkit from tuxcademy.
Bonus
- Read The Phoenix project
Day 4
sed101awk101
Homework
- Get yourself some usecases, and write real scripts.
- Get inspired.
- Get inspired again.
- Again! Study Advanced Linux: The Linux Shell and Toolkit from tuxcademy.
Bonus
- Read The Unicorn Project
Day 5
- Picnic 102
- User management (CRUD, config files, …)
- File permission and access control (
chmod,chown,sudo…)
Homework
- Learn about ACLs (
getfacl,setfacl, …) - Study Linux Administration I from tuxcademy.
Bonus
- Follow some people and communities in Social Media.
Day 6
Homework
- Install linux from scratch
- Make your own kernel.
Bonus
- Read about 12 Factor App and Beyond.
Day 7
- Learn about Linux processes
- What is a process
- Linux process table (
/proc/,/sys/proc…) - Process states, priority, nice, ulimit …
- Manage you processes (
ps,top,htop,kill,pkill,pgrep…)
Homework
No Homework
Day 8
Break
Day 9
- Learn about the LFS (Linux FileSystem)
/etc,/dev/,/proc,sys,/tmp,/home…
- Learn about linux filesystems
ext4,xfs,btrfs,zfs(on Linux), …- Learn the features.
Homework
- Read some config files, and tinker with them.
- Learn about volume management (LVM, Btrfs, ZFS)
- Pick a database (SQLite, PostgreSQL, MySQL) and practice SQL basics in SQLBolt
Bonus
- Learn about storage hardware. Good Intro in the videos here.
Day 10
- Figure out how to add a disk to your machine.
- vagrant: you should use provider or plugin
- cloud: easy but can cost some money (not if you are using free tier).
- Partition your new disk (
lsblk,*fdisk,parted) - Format your partitions (
mkfs) - Start using them (
mount,umount,df,du,fstab…)
Homework
Bonus
- Great course about Fundamentals of Database Engineering.
Day 11: It is NETWORKING day 🎉
- Watch this (13/13)
- Make sure you understand IP and TCP and all the mentioned protocols
- Read about OSI
- Install wireshark on your host machine.
- Did you see that ?
- Profile some protocols
Homework
Bonus
- Computer Networking - a top down approach: A Great read about Networking.
Day 12: Mooore networking 🎉
- Learn about addressing and subnetting
- Practice! Practice!
- Use Cloud !
Homework
- Create networks and subnets.
- vagrant: netmask
- Use Cloud !
Bonus
- Learn IAC and use it to manage your cloud resources (Terraform, CDK, Pulumi …)
Day 13: Mooooore networking 🎉
- Learn about Linux Networking
- iproute2 vs net-tools
- Play with iproute2
- Network configuration in Linux (DIY vs Network managers)
- Tinker with common network tools
Homework
- Learn about Linux network interfaces
- Learn about Linux firewalls
- Implement your own protocol on top of TCP using Linux Sockets.
Bonus
- Make your own X are great in general.
Day 14: Let’s be our sysadmins
Homework
- UFW 101
- Cronjobs 101: Cron or systemd-timers
Bonus
- Xavki: Good and extensive French content, if you need to learn about some DevOps tools.
Day 15: Containers 101
- Take this or this (longer and better)
- Install Docker or Podman
- Docker pull
- Docker images
- Docker run
- Docker ps
- Docker exec
- Enjoy your new superpowers !!
Homework
- Create your own containers and have fun!
Bonus
- Awesome content about container internals.
Day 16: Container 102
- Learn more about container internals (Namespaces, Cgroups, Overlay filesystems, …)
- Learn about OCI (Open Container Initiative)!
Homework
- Make your own container engine !
Bonus
- Read code from containers projects
Day 17
Container 103
- READ A LOT OF DOCKERFILES!!!!
- Create you own! it is so easy now!
Homework
- Learn multi-stage builds
- Learn about kaniko and buildah
Bonus
- Learn about System containers (LXC/LXD, Incus, Systemd-nspawn, …)
Day 18
Compose is so easy!
- Read as many compose files as you can.
- Run examples.
- Make your own.
Homework
- Redo Day 14 with compose!
Bonus
Day 19
Break
Day 20
Git 102
- Pick a stack and a project (java, javascript, python …)
git clone->rm -rf .git->git init- Push the code into gitlab
- Practice (branching, Merge Requests, …)
Homework
- Learn about gitflow
Bonus
- Learn Git Internals from the book itself.
Day 21
- Create a CI/CD pipeline for your project.
- Test the code, build it and package it.
Homework
- Create a deploy job to deploy to a PAAS.
- Optimize your pipelines.
Bonus
- Enroll for the missing semester or watch sessions from fall 2023.
Day 21 -
There still more things to learn, maybe next time!
Thank you
Let’s be friends! 🤗
DevOps in 21 Days!