b.workloads-Scheduling.md

Workloads & Scheduling (15%)

• Understand deployments and how to perform rolling update and rollbacks

• Use ConfigMaps and Secrets to configure applications

• Know how to scale applications

• Understand the primitives used to create robust, self-healing, application deployments

• Understand how resource limits can affect Pod scheduling

• Awareness of manifest management and common templating tools

• Understand deployments and how to perform rolling update and rollbacks.

  • Practical Examples for 3 Advanced Kubernetes deployment strategies)^Doc

  • Kubernetes Documentation > Concepts > Workloads > Controllers > Deployments^Doc

  • Example Deployment File (dep-nginx.yaml) using NGINX

    apiVersion: apps/v1
    kind: Deployment
    metadata:
        name: nginx-deployment
        labels:
            app: nginx
    spec:
      replicas: 3
      selector:
        matchLabels:
          app: nginx
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: nginx:1.21.6
            ports:
            - containerPort: 80

    # Create Deployment
    kubectl create -f dep-nginx.yaml
    
    # Get Deployments
    kubectl get deployments
    
    # Update Deployment
    kubectl edit deployment.v1.apps/nginx-deployment
    
    # See rollout status
    kubectl rollout status deployment.v1.apps/nginx-deployment
    
    # Describe Deployment
    kubectl describe deployment
    
    # Rolling back to a previous revision
    kubectl rollout undo deployment.v1.apps/nginx-deployment

  • Use ConfigMaps and Secrets to configure applications.^Blog

  • Kubernetes Secrets: A complete guide to securely managing sensitive information^Blog

  • Kubernetes Documentation > Concepts > Configuration > ConfigMaps^Doc

  • Kubernetes Documentation > Concepts > Configuration > Secrets^Doc

• Know how to scale applications.

  • Kubernetes Documentation > Concepts > Cluster Administration > Managing Resources > Scaling Your Application^Doc.

    # Increase replicas number for nginx-deployment
    kubectl scale deployment/nginx-deployment --replicas=5
    
    # Using autoscaling
    kubectl autoscale deployment/nginx-deployment --min=2 --max=5

• Understand the primitives used to create robust, self-healing, application deployments.

  • Kubernetes Documentation > Concepts > Workloads > Pods > Pod Lifecycle^Doc

  • Kubernetes Monitoring and Logging By Examples^Blog

  • Kubernetes Documentation > Tasks > Configure Pods and Containers > Configure Liveness, Readiness and Startup Probes^Doc

• Understand how resource limits can affect Pod scheduling.

  • Kubernetes Documentation > Concepts > Configuration > Managing Resources for Containers^Doc

• Awareness of manifest management and common templating tools.

  • Kubernetes Documentation > Concepts > Cluster Administration > Managing Resources^Doc

  • Kubernetes Documentation > Tasks > Manage Kubernetes Objects^Doc