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From sysadmin to DevOps engineer, ten minutes a day.

One chapter a day, on real open-source code. Questions you get right come back 1, 3, 7, 21 and 45 days later.

Today · day 1 · 10 min

What DevOps is: dev and ops owning one service
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The DevOps mindset: 0 of 5Fundamentals: 0 of 5Git: 0 of 5Containers: 0 of 5CI/CD: 0 of 5Infrastructure as code: 0 of 5Running in production: 0 of 5Kubernetes: 0 of 5
One pillar per part. It fills as you finish its chapters.

The path

The DevOps mindset: 0 of 5The DevOps mindset

  1. What DevOps is: dev and ops owning one service 1
  2. Small batches, fast feedback 2
  3. DORA metrics: is delivery getting better? 3
  4. Pets vs cattle: replacing servers instead of repairing them 4
  5. Toil: finding and automating repetitive ops work 5

Fundamentals: 0 of 5Fundamentals

  1. Exit codes, streams and systemd: how tools talk 6
  2. Networking: debug one layer at a time 7
  3. Shell scripts that stop at the first error 8
  4. YAML: syntax and type guessing 9
  5. SSH keys and secrets: keep them out of Git 10

Git: 0 of 5Git

  1. Git: snapshots, three areas and HEAD 11
  2. Branches, merge and rebase 12
  3. Trunk-based development vs GitFlow 13
  4. Pull requests, protected branches and CODEOWNERS 14
  5. Tags, versions and releases 15

Containers: 0 of 5Containers

  1. Containers and virtual machines 16
  2. The Dockerfile and its build cache 17
  3. Small, safe images 18
  4. Registries, tags and digests 19
  5. Docker Compose: the whole stack in one file 20

CI/CD: 0 of 5CI/CD

  1. Pipelines: running the deploy runbook on every push 21
  2. GitHub Actions: a pipeline in the repo 22
  3. GitLab CI: stages, runners, cache and artifacts 23
  4. Jenkins: controller, agents and the Jenkinsfile 24
  5. Deploy strategies: replacing the version in production 25

Infrastructure as code: 0 of 5Infrastructure as code

  1. Ansible: playbooks over SSH 26
  2. Ansible roles: one folder per job 27
  3. AWS essentials: regions, networks, firewalls and roles 28
  4. Terraform: plan and apply 29
  5. Terraform state, backends and modules 30

Kubernetes: 0 of 5Kubernetes

  1. Why Kubernetes: controllers and desired state 31
  2. Pods, Deployments and Services 32
  3. Config, health checks and resources 33
  4. Ingress and persistent storage 34
  5. Helm: a package manager for Kubernetes 35

Running in production: 0 of 5Running in production

  1. Cluster management: upgrade without an outage 36
  2. Namespaces and RBAC: sharing a cluster between teams 37
  3. GitOps: Git is the source of truth 38
  4. Observability and incidents: page on what users feel 39
  5. Capstone: from git push to a paged alert 40