book

Certified Kubernetes Administrator (CKA) Study Guide

by Benjamin Muschko

June 2022

Intermediate to advanced

201 pages

4h 42m

English

O'Reilly Media, Inc.

Book available

Read now

Unlock full access

Who This Book Is ForWhat You Will LearnConventions Used in This BookUsing Code ExamplesO’Reilly Interactive Katacoda LabsO’Reilly Online LearningHow to Contact UsAcknowledgments
Exam ObjectivesCurriculumCluster Architecture, Installation, and ConfigurationWorkloads and SchedulingServices and NetworkingStorageTroubleshootingInvolved Kubernetes PrimitivesExam Environment and TipsCandidate SkillsTime ManagementCommand-Line Tips and TricksSetting a Context and NamespaceUsing an Alias for kubectlUsing kubectl Command Auto-CompletionInternalize Resource Short NamesDeleting Kubernetes ObjectsFinding Object InformationDiscovering Command OptionsPracticing and Practice ExamsSummary
Role-Based Access ControlRBAC High-Level OverviewCreating a SubjectListing ServiceAccountsRendering ServiceAccount DetailsAssigning a ServiceAccount to a PodUnderstanding RBAC API PrimitivesDefault User-Facing RolesCreating RolesListing RolesRendering Role DetailsCreating RoleBindingsListing RoleBindingsRendering RoleBinding DetailsSeeing the RBAC Rules in EffectNamespace-wide and Cluster-wide RBACAggregating RBAC RulesCreating and Managing a Kubernetes ClusterInstalling a ClusterManaging a Highly Available ClusterUpgrading a Cluster VersionBacking Up and Restoring etcdBacking Up etcdRestoring etcdSummaryExam EssentialsSample Exercises
Managing Workloads with DeploymentsUnderstanding DeploymentsCreating DeploymentsListing Deployments and Their PodsRendering Deployment DetailsDeleting a DeploymentPerforming Rolling Updates and RollbacksRolling Out a New RevisionRolling Back to a Previous RevisionScaling WorkloadsManually Scaling a DeploymentManually Scaling a StatefulSetAutoscaling a DeploymentCreating Horizontal Pod AutoscalersListing Horizontal Pod AutoscalersRendering Horizontal Pod Autoscaler DetailsUsing the Beta API Version of an Horizontal Pod AutoscalerDefining and Consuming Configuration DataCreating a ConfigMapConsuming a ConfigMap as Environment VariablesMounting a ConfigMap as a VolumeCreating a SecretConsuming a Secret as Environment VariablesMounting a Secret as a VolumeSummaryExam EssentialsSample Exercises
Understanding How Resource Limits Affect Pod SchedulingDefining Container Resource RequestsDefining Container Resource LimitsDefining Container Resource Requests and LimitsManaging ObjectsDeclarative Object Management Using Configuration FilesDeclarative Object Management Using KustomizeCommon Templating ToolsUsing the YAML Processor yqUsing HelmSummaryExam EssentialsSample Exercises
Kubernetes Networking BasicsConnectivity Between ContainersConnectivity Between PodsUnderstanding ServicesService TypesCreating ServicesListing ServicesRendering Service DetailsPort MappingAccessing a Service with Type ClusterIPAccessing a Service with Type NodePortAccessing a Service with Type LoadBalancerUnderstanding IngressIngress RulesCreating IngressesDefining Path TypesListing IngressesRendering Ingress DetailsAccessing an IngressUsing and Configuring CoreDNSInspecting the CoreDNS PodInspecting the CoreDNS ConfigurationCustomizing the CoreDNS ConfigurationDNS for ServicesResolving a Service by Hostname from the Same NamespaceResolving a Service by Hostname from a Different NamespaceDNS for PodsResolving a Pod by HostnameChoosing an Appropriate Container Network Interface PluginSummaryExam EssentialsSample Exercises
Understanding VolumesVolume TypesCreating and Accessing VolumesUnderstanding Persistent VolumesStatic vs. Dynamic ProvisioningCreating PersistentVolumesConfiguration Options for a PersistentVolumeVolume ModeAccess ModeReclaim PolicyCreating PersistentVolumeClaimsMounting PersistentVolumeClaims in a PodUnderstanding Storage ClassesCreating Storage ClassesUsing Storage ClassesSummaryExam EssentialsSample Exercises
Evaluating Cluster and Node LoggingCluster LoggingNode LoggingMonitoring Cluster Components and ApplicationsTroubleshooting Application FailuresTroubleshooting PodsOpening an Interactive ShellTroubleshooting ServicesTroubleshooting Cluster FailuresTroubleshooting Control Plane NodesTroubleshooting Worker NodesSummaryExam EssentialsSample Exercises
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”

Content preview from Certified Kubernetes Administrator (CKA) Study Guide

Preface

Kubernetes, as a runtime and orchestration environment for microservices, is widely used among startups and large enterprises alike. As your organization ramps up on the number of applications, managing the Kubernetes clusters becomes a full-time job. That’s the role of a Kubernetes administrator. The person responsible for this job ensures that each cluster is an operational state, scales up the cluster by onboarding nodes, upgrades the Kubernetes version of the nodes to incorporate patches and new features, and is in charge of a backup strategy for crucial cluster data. To help job seekers and employers have a standard means to demonstrate and evaluate proficiency in developing with a Kubernetes environment, the Cloud Native Computing Foundation (CNCF) developed the Certified Kubernetes Administrator (CKA) program. To achieve this certification, you need to pass an exam.

There are two other Kubernetes certifications you can find on the CNCF web page. The Certified Kubernetes Application Developer (CKAD) focuses on the developer-centric application of Kubernetes. The Certified Kubernetes Security Specialist (CKS) was created to verify the competence on security-based topics and requires a successful pass of the CKA exam before you can register. Passing the CKAD and CKS are not mandatory for taking the CKA exam.

In this study guide, I will explore the topics covered in the CKA exam to fully prepare you to pass the certification exam. We’ll look at determining when and ...