DevOps Cheat Sheet 2026: CALMS, CI/CD, IaC, Containers, Observability

🚀 The Ultimate DevOps Cheat Sheet for 2026 🚀 Whether you are transitioning into DevOps, preparing for an interview, or just need a quick refresher, keeping the core concepts straight is essential. Here is a high-level breakdown of the modern DevOps ecosystem. 👇 🧠 1. The Core Philosophy (CALMS) DevOps isn't just tools; it's a culture. Culture: Collaboration between Dev and Ops. Automation: Remove manual, repetitive tasks. Lean: Focus on delivering value and eliminating waste. Measurement: Track everything (metrics, logs, performance). Sharing: Open communication and shared responsibilities. 🔄 2. CI/CD (Continuous Integration / Continuous Delivery) The engine of modern software delivery. CI: Automatically building and testing code every time a team member commits changes (e.g., Jenkins, GitHub Actions, GitLab CI). CD (Delivery): Ensuring the code is always in a deployable state. CD (Deployment): Every change that passes automated tests is deployed to production automatically. 🏗️ 3. Infrastructure as Code (IaC) Managing and provisioning computing infrastructure through machine-readable definition files. Provisioning: Terraform, AWS CloudFormation (Setting up the servers, networks, databases). Configuration Management: Ansible, Chef, Puppet (Installing software and managing configurations on those servers). 🐳 4. Containers & Orchestration Packaging software to run reliably anywhere. Docker: Packages an application and its dependencies into a standardized unit (container). Kubernetes (K8s): The conductor. Automates deployment, scaling, and management of containerized applications across clusters of hosts. 📊 5. Observability & Monitoring You can't fix what you can't see. The three pillars: Metrics: System numbers (CPU, memory, request rates). Tools: Prometheus, Datadog. Logs: Immutable records of discrete events. Tools: ELK Stack (Elasticsearch, Logstash, Kibana), Splunk. Traces: Tracking a single request as it flows through a distributed system. Tools: Jaeger, OpenTelemetry. ☁️ 6. Cloud Providers Where the magic happens. AWS: The market leader (EC2, S3, EKS). Azure: Deep enterprise integration (AKS, Azure DevOps). GCP: Google Cloud, known for strong data and Kubernetes (GKE) offerings. Pro-Tip: You don't need to master every tool. Focus on understanding the underlying concepts (e.g., how orchestration works) rather than just memorizing a specific tool's CLI commands. Tools change; concepts scale. What is your go-to DevOps tool that you can't live without right now? Let me know in the comments! 👇 #DevOps #Tech #SoftwareEngineering #CloudComputing #Kubernetes #Terraform #CICD #TechCareers #Programming

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