DevOps and Cloud with Linux

DevOps and Cloud with Linux

DevOps and cloud computing are built on Linux foundations. Linux proficiency is essential for modern IT careers.

DevOps on Linux

Linux is the standard DevOps platform. Git (version control), Docker (containers), Kubernetes (orchestration), Jenkins/GitHub Actions (CI/CD), Ansible/Terraform (automation) — all run natively on Linux.

CI/CD Pipelines

Developer pushes code → CI builds → run tests → create Docker image → push to registry → deploy to staging → integration tests → deploy to production. Tools: Jenkins, GitLab CI, GitHub Actions, CircleCI. Defined as code (YAML).

Docker in Production

Minimal base images (Alpine), multi-stage builds, non-root users, health checks, resource limits, log to stdout/stderr. Container registries: Docker Hub, ECR, ACR, GCR.

Kubernetes Basics

Pods (smallest unit), Deployments (replicas), Services (networking), Ingress (external access), ConfigMaps/Secrets (config), Namespaces (isolation). kubectl CLI. Managed K8s: EKS, AKS, GKE.

Cloud CLI Tools

AWS CLI, Azure CLI, gcloud, Terraform CLI. Manage cloud resources from terminal. Enable automation and CI/CD integration. Auth via access keys, service principals, IAM roles.

Monitoring and Observability

Prometheus (metrics), Grafana (dashboards), ELK Stack (logs), Jaeger (tracing). Three pillars: metrics, logs, traces for comprehensive system understanding.

Career Path

System Administrator → DevOps Engineer → SRE → Cloud Architect. Certifications: RHCSA/RHCE, CKA/CKAD, AWS/Azure/GCP. Continuous learning and hands-on practice essential.

Summary

DevOps and cloud are built on Linux. CI/CD, Docker, Kubernetes, cloud CLI, and observability enable modern software delivery. Linux proficiency is the foundation for DevOps and cloud careers.