DevOps Engineer: Free Skill Evaluation

What Is DevOps? Culture Automation Collaboration requirements development testing sprint backlog release deployment frequency lead time for changes change failure rate filesystem files directories CORE LINUX COMMANDS chmod chown umask ps top htop awareness SYSTEMD journalctl application logs syslog concepts disks mount curl ping dig key authentication ssh-agent concepts secure access LINUX TROUBLESHOOTING LINUX LAB Deploy & Troubleshoot a Linux Web Service variables parameters conditions SHELL PIPELINES disk monitor process monitor log analyzer CRON BASH PROJECT Linux Server Health Monitor list/dict loops infrastructure inventory log parser API automation BOTO3 AWARENESS IP CIDR subnet request response headers health check L4 L7 DNS NETWORKING TEST init clone add commit history HEAD remote BRANCHING STRATEGIES Trunk-Based Development Feature Branching MERGE CONFLICTS REBASE review approvals checks GIT TAGGING GIT PROJECT Team Repository Workflow SOFTWARE BUILD FUNDAMENTALS Java Node.js JAR WAR npm bundle Nexus concepts Artifactory concepts ECR CONTINUOUS INTEGRATION controller agent job JENKINS PIPELINE AS CODE Build Test Scan JENKINS AGENTS JENKINS CREDENTIALS JENKINS SHARED LIBRARY AWARENESS JENKINS PROJECT Java/Node/Python CI Pipeline workflow event push pull_request workflow_dispatch GITHUB SECRETS MATRICES REUSABLE WORKFLOWS SELF-HOSTED RUNNERS AWARENESS GITHUB ACTIONS PROJECT Production CI Pipeline CONTINUOUS DELIVERY Continuous Deployment DEV TEST STAGE APPROVAL GATES DEPLOYMENT STRATEGIES Recreate Rolling ROLLBACK image container registry FROM WORKDIR COPY IMAGE LAYERS MULTI-STAGE BUILD DOCKER NETWORKS DOCKER VOLUMES DOCKER COMPOSE DOCKER SECURITY DOCKER PROJECT Containerize a Production Application Docker Hub concepts AWS ECR image tagging IMAGE VERSION STRATEGY cluster control plane worker node PODS replicas updates rollbacks REPLICASET SERVICES ClusterIP NodePort DNS & SERVICE DISCOVERY CONFIGMAPS SECRETS NAMESPACES REQUESTS & LIMITS READINESS PROBE LIVENESS PROBE STARTUP PROBE ROLLING UPDATE HORIZONTAL POD AUTOSCALING PV PVC StorageClass concepts STATEFULSETS log agents node monitoring JOBS CRONJOBS INGRESS GATEWAY API AWARENESS KUBERNETES PROJECT Deploy Three-Tier Application KUBERNETES TROUBLESHOOTING Scenario 1 CrashLoopBackOff chart values templates HELM STRUCTURE ENVIRONMENT VALUES HELM PROJECT IAM VPC EC2 AWS IAM SG EC2 OPERATIONS ALB AUTO SCALING artifacts state backends concepts storage CLOUDWATCH managed control plane worker/node groups concepts EKS ACCESS EKS AUTOSCALING EKS ADD-ONS EKS PROJECT Deploy Production Application on EKS provider resource variable TERRAFORM WORKFLOW state file sensitive information collaboration REMOTE STATE STATE LOCKING MODULES dev test stage TERRAFORM IMPORT TERRAFORM DRIFT create_before_destroy prevent_destroy concepts TERRAFORM SECURITY TERRAFORM PROJECT AWS Infrastructure as Code inventory playbook task packages users configurations IDEMPOTENCY ANSIBLE ROLES ANSIBLE PROJECT TERRAFORM VS ANSIBLE Terraform Ansible GITOPS FUNDAMENTALS Application repository sync AUTOMATED SYNC SELF-HEALING PRUNE APP OF APPS CONCEPTS APPLICATIONSETS GITOPS PROJECT GitHub → Argo CD → Kubernetes CI VS CD VS GITOPS CI GitOps metrics targets scraping Counter Gauge Histogram PROMQL ALERTMANAGER GRAFANA MONITORING PROJECT Kubernetes Observability Dashboard GOLDEN SIGNALS Latency Traffic RED METHOD Rate Errors USE METHOD Utilization Saturation infrastructure logs Kubernetes logs STRUCTURED LOGGING OpenSearch/ELK Loki cost operations compliance logs concepts traces DISTRIBUTED TRACING CORRELATION IDs DEVSECOPS SAST DEPENDENCY SCANNING passwords API keys tokens CONTAINER SCANNING SBOM AWARENESS INFRASTRUCTURE SECURITY SCANNING admission policies infrastructure policies Role ClusterRole RoleBinding POD SECURITY NETWORK POLICIES SECRET MANAGEMENT DEVSECOPS PROJECT Secure CI/CD Pipeline semantic versioning release notes artifact promotion IMMUTABLE ARTIFACTS version approver deployment backward-compatible schema changes migration sequencing rollback limitations EXPAND/CONTRACT PATTERN AWARENESS FEATURE FLAGS Code Deployment Feature Release many repositories many pipelines many images PIPELINE TEMPLATES PLATFORM STANDARDIZATION PLATFORM ENGINEERING Self-Service Golden Paths service creation secrets Dockerfile CI pipeline Helm chart BACKSTAGE AWARENESS reliability automation measurement SLI SLO SLA ERROR BUDGET TOIL Automate it load growth resource utilization INCIDENT MANAGEMENT INCIDENT SEVERITY SEV-1 SEV-2 impact current state mitigation timeline root cause BLAMELESS POSTMORTEMS restart service rollback release restore DB actionable alerts escalation ownership Incident 1 Incident 2 Incident 3 pod failure node failure dependency failure backup restore RPO application data persistent data configuration where required TERRAFORM RECOVERY IaC is not the same as application-data backup idle resources overprovisioning unused requests oversized nodes idle namespaces FINOPS AWARENESS log summarization configuration explanation Terraform review AI SAFETY FOR OPERATIONS anomaly detection event correlation incident summarization