Certified Kubernetes Administrator (CKA) Study Guide. In-Depth Guidance and Practice (Early Release)

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Copyright
Table of Contents
Preface
	Who This Book Is For
	What You Will Learn
	Conventions Used in This Book
	Using Code Examples
	O’Reilly Online Learning
	How to Contact Us
	Acknowledgments
Chapter 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
Chapter 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
Chapter 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
Chapter 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
Chapter 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
Chapter 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
Chapter 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
Chapter 8. Wrapping Up
Appendix A. 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
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