Certified Kubernetes Administrator (CKA) Study Guide: In-Depth Guidance and Practice

follow Preface Who This Book Is For What You Will Learn Conventions Used in This Book Using Code Examples O’Reilly Interactive Katacoda Labs O’Reilly Online Learning How to Contact Us Acknowledgments 1. Exam Details and Resources Exam Objectives Curriculum Cluster Architecture, Installation, and Configuration Workloads and Scheduling Services and Networking Storage Troubleshooting Involved Kubernetes Primitives Exam Environment and Tips Candidate Skills Time Management Command-Line Tips and Tricks Setting a Context and Namespace Using an Alias for kubectl Using kubectl Command Auto-Completion Internalize Resource Short Names Deleting Kubernetes Objects Finding Object Information Discovering Command Options Practicing and Practice Exams Summary 2. Cluster Architecture, Installation, and Configuration Role-Based Access Control RBAC High-Level Overview Creating a Subject Listing ServiceAccounts Rendering ServiceAccount Details Assigning a ServiceAccount to a Pod Understanding RBAC API Primitives Default User-Facing Roles Creating Roles Listing Roles Rendering Role Details Creating RoleBindings Listing RoleBindings Rendering RoleBinding Details Seeing the RBAC Rules in Effect Namespace-wide and Cluster-wide RBAC Aggregating RBAC Rules Creating and Managing a Kubernetes Cluster Installing a Cluster Managing a Highly Available Cluster Upgrading a Cluster Version Backing Up and Restoring etcd Backing Up etcd Restoring etcd Summary Exam Essentials Sample Exercises 3. Workloads Managing Workloads with Deployments Understanding Deployments Creating Deployments Listing Deployments and Their Pods Rendering Deployment Details Deleting a Deployment Performing Rolling Updates and Rollbacks Rolling Out a New Revision Rolling Back to a Previous Revision Scaling Workloads Manually Scaling a Deployment Manually Scaling a StatefulSet Autoscaling a Deployment Creating Horizontal Pod Autoscalers Listing Horizontal Pod Autoscalers Rendering Horizontal Pod Autoscaler Details Using the Beta API Version of an Horizontal Pod Autoscaler Defining and Consuming Configuration Data Creating a ConfigMap Consuming a ConfigMap as Environment Variables Mounting a ConfigMap as a Volume Creating a Secret Consuming a Secret as Environment Variables Mounting a Secret as a Volume Summary Exam Essentials Sample Exercises 4. Scheduling and Tooling Understanding How Resource Limits Affect Pod Scheduling Defining Container Resource Requests Defining Container Resource Limits Defining Container Resource Requests and Limits Managing Objects Declarative Object Management Using Configuration Files Declarative Object Management Using Kustomize Common Templating Tools Using the YAML Processor yq Using Helm Summary Exam Essentials Sample Exercises 5. Services and Networking Kubernetes Networking Basics Connectivity Between Containers Connectivity Between Pods Understanding Services Service Types Creating Services Listing Services Rendering Service Details Port Mapping Accessing a Service with Type ClusterIP Accessing a Service with Type NodePort Accessing a Service with Type LoadBalancer Understanding Ingress Ingress Rules Creating Ingresses Defining Path Types Listing Ingresses Rendering Ingress Details Accessing an Ingress Using and Configuring CoreDNS Inspecting the CoreDNS Pod Inspecting the CoreDNS Configuration Customizing the CoreDNS Configuration DNS for Services Resolving a Service by Hostname from the Same Namespace Resolving a Service by Hostname from a Different Namespace DNS for Pods Resolving a Pod by Hostname Choosing an Appropriate Container Network Interface Plugin Summary Exam Essentials Sample Exercises 6. Storage Understanding Volumes Volume Types Creating and Accessing Volumes Understanding Persistent Volumes Static vs. Dynamic Provisioning Creating PersistentVolumes Configuration Options for a PersistentVolume Volume Mode Access Mode Reclaim Policy Creating PersistentVolumeClaims Mounting PersistentVolumeClaims in a Pod Understanding Storage Classes Creating Storage Classes Using Storage Classes Summary Exam Essentials Sample Exercises 7. Troubleshooting Evaluating Cluster and Node Logging Cluster Logging Node Logging Monitoring Cluster Components and Applications Troubleshooting Application Failures Troubleshooting Pods Opening an Interactive Shell Troubleshooting Services Troubleshooting Cluster Failures Troubleshooting Control Plane Nodes Troubleshooting Worker Nodes Summary Exam Essentials Sample Exercises 8. Wrapping Up Answers to Review Questions Chapter 2, “Cluster Architecture, Installation, and Configuration” Chapter 3, “Workloads” Chapter 4, “Scheduling and Tooling” Chapter 5, “Services and Networking” Chapter 6, “Storage” Chapter 7, “Troubleshooting” Index About the Author