Complete DevOps Cheatsheet

# Container Lifecycle
docker run nginx              # Create and start container
docker run -d nginx           # Detached mode
docker run -it ubuntu bash    # Interactive terminal
docker run --name web nginx   # Named container
docker run -p 8080:80 nginx   # Port mapping

# Container Management
docker ps                     # Running containers
docker

# Container Inspection
docker logs container_id      # View logs
docker logs -f container_id   # Follow logs
docker exec -it container_id bash  # Execute command
docker inspect container_id   # Detailed info
docker stats                  # Resource usage
docker

# Image Operations
docker images                 # List images
docker pull nginx:latest      # Pull image
docker push user/image:tag    # Push to registry
docker build -t myapp:1.0 .   # Build image
docker tag source

# Docker Compose Commands
docker-compose up                    # Start services
docker-compose up -d                 # Detached mode
docker-compose down                  # Stop and remove
docker-compose ps                    # List services
docker-compose

# Cluster Information
kubectl cluster-info              # Cluster details
kubectl get nodes                 # List nodes
kubectl describe node node1       # Node details
kubectl version                   # Kubernetes version
kubectl api-resources             # Available resources

# Pod Operations
kubectl get pods                  # List pods
kubectl get pods -A               # All namespaces
kubectl get pods -o wide          # Detailed view
kubectl describe pod mypod        # Pod details
kubectl logs mypod                # Pod logs
kubectl logs -f mypod             # Follow logs

# Service Operations
kubectl get services              # List services
kubectl expose deployment nginx --port=80 --type=LoadBalancer
kubectl describe service nginx    # Service details
kubectl delete service nginx

# Service Types
# ClusterIP: Internal cluster access
# NodePort: External access via node port

# Resource Management
kubectl create -f file.yaml       # Create resource
kubectl apply -f file.yaml        # Apply/update resource
kubectl delete -f file.yaml       # Delete resource
kubectl apply -f ./directory/     # Apply all in directory
kubectl get -f file.yaml          # Get resource status

# Repository Setup
git init                          # Initialize repository
git clone url                     # Clone repository
git config --global user.name "Name"
git config --global user.email "email@example.com"

# Basic Workflow

# File Permissions
chmod 755 file.txt                # Change permissions
chmod +x script.sh                # Add execute permission
chmod -R 644 directory            # Recursive
chown user:group file.txt         # Change ownership
chown -R

// Declarative Pipeline (Jenkinsfile)
pipeline {
    agent any
    
    environment {
        DOCKER_REGISTRY = 'registry.example.com'
    }
    
    stages {
        stage(        
        
        
    

# Terraform Commands
terraform init                    # Initialize working directory
terraform plan                    # Preview changes
terraform apply                   # Apply changes
terraform apply -auto-approve     # Skip confirmation
terraform destroy                 # Destroy infrastructure
terraform fmt                     # Format configuration
terraform validate                # Validate syntax

# Ansible Commands
ansible all -m ping               # Test connectivity
ansible all -m shell -a "uptime"  # Run command
ansible-playbook playbook.yml     # Run playbook
ansible-playbook playbook.yml --check  # Dry run
ansible-playbook playbook.yml -v  # Verbose

# Sample Prometheus Configuration (prometheus.yml)
global:
  scrape_interval: 15s
  evaluation_interval: 15s

scrape_configs:
  - job_name: 'prometheus'
    static_configs:  
  

# Docker Security Scanning
docker scan image:tag             # Scan for vulnerabilities
trivy image nginx:latest          # Trivy scanner

# Container Security
docker run --read-only nginx      # Read-only filesystem
docker run --cap-drop ALL nginx   # Drop capabilities
docker run --security-opt no-new-privileges nginx