DevOps Learning Guide

All things DevOps: processes, best practices, guides and more!

DNS

What is DNS?

Understanding how DNS works

The dig command in Linux

Authoritative vs Recursive DNS Servers: What's the Difference?

DNS Records

Subdomain Delegation

Version Control / Git

Learn Git

Git Branching Strategies

Oh Shit, git! : How to fix mistakes

Manage multiple SSH keys and Github Accounts Handle multiple git configs in one machine

AWS

Easy Amazon EC2 Instance Comparison

Azure

Cloud Adoption Framework

Docker

Docker Certified Associate

Containerisation Explained

App Containerisation and comparisaon to VMs

Best Practices for writing Dockerfiles

The Why and How to use Multi-Stage Docker builds for lean production images

Linux

An introduction to Linux filesystems

Understanding Linux filesystems: ext4 and beyond

An A-Z index of the Linux command line

Understanding /etc/hosts file in Linux

Security

Hardening your HTTP response headers

Restful APIs

Best Practices for Designing a Pragmatic RESTful API

Terraform

Terraform Certified Associate Terraform Best Practice The ultimate terraform cheat sheet

CICD Sample Tools & Workflows

Build Runner - A docker container containing all tools required to build your app Github Actions <> Octopus Deploy - Github Actions CI pipeline sample workflow with Octopus Deploy

Recommended Tools

CICD:

• TeamCity (CI)
• Octopus Deploy (CD)
• Bitbucket Pipelines
• GitHub Actions
• GitLab

IDE's

• Visual Studio Code
• Atom
• Sublime Text
• IntelliJ

Git GUIs

• Fork
• Source Tree
• GitKraken

Cloud

• CloudDiscovery - Helps you discover resources in the cloud environment

Docker

• Explore each layer in a docker image

RESTful Clients

• Postman

Security Testing

• SSL Labs: SSL Server Testing
• CISOfy/Lynis: Compliance testing (ISO27001/PCI/HIPAA)

Package Managers

• Pip: Python package manager
• npm : Node Package Manager
• Composer: Dependency Manager for PHP
• Homebrew: Package Manager for OSX

Database Clients

• DBeaver: Universal Database Tool
• HeidiSQL: Tools for MySQL and its Forks

Testing

• Sitediff: Site difference
• K6: Load Testing
• WebPageTest: Performance Testing

Site optimisations:

• Tinyjpg: WebP, JPEG and PNG compression
• SVG Converter: Image to SVG format

IaC:

• tflint: Terraform linter
• cfn-format: Cloudformation formatter
• cfn-lint: Cloudformation linter
• terratest: Write automated tests for IaC

DNS:

• Dig
• Nslookup

Network:

• nmap
• traceroute
• tcpdump
• iptables
• netstat

Web Servers:

• NGINX
• Apache

Monitoring tools:

• Seq (https://datalust.co)
• Grafana (https://datalust.co)
• NewRelic (https://newrelic.com/)
• ELK (https://www.elastic.co/what-is/elk-stack)
• Splunk (https://www.splunk.com)
• PagerDuty (https://www.pagerduty.com)

Protocols:

• SFTP
• FTP
• SSH
• SCP
• VNC
• RDP