Certified Kubernetes Administrator (CKA) Exam Guide: Validate your knowledge of Kubernetes and implement it in a real-life production environment

source url Certified Kubernetes Administrator (CKA) Exam Guide Foreword Note from the author Contributors About the author About the reviewers Preface Who this book is for What this book covers To get the most out of this book Download the color images Conventions used Get in touch Share Your Thoughts Part 1: Cluster Architecture, Installation, and Configuration 1 Kubernetes Overview CKA exam overview What to expect in your CKA exam CKA exam tips and tricks Cluster architecture and components Kubernetes core concepts Containerized workloads Container images Container registry Container runtimes Kubernetes basic workflow Kubernetes plugin model Kubernetes API primitives Sharing a cluster with namespaces Kubernetes in-market distribution and ecosystems Upstream vanilla Kubernetes Managed Kubernetes Kubernetes ecosystems Summary 2 Installing and Configuring Kubernetes Clusters Technical requirements Hands-on Kubernetes tooling Core tools Deployment tools Other tools Installing and configuring a Kubernetes cluster Prerequisites for installing a Kubernetes cluster Using minikube to set up a single node Kubernetes cluster Using kubeadm to install a basic Kubernetes cluster Setting up a highly available cluster with kubeadm Summary Mock CKA scenario-based practice test Scenario 1: Scenario 2: Scenario 3 (optional): FAQs 3 Maintaining Kubernetes Clusters Demystifying Kubernetes cluster maintenance Upgrading a Kubernetes cluster using kubeadm Upgrading the master node Upgrading the worker node Working with etcd Exploring the ETCD cluster pod Listing etcd cluster members Checking the etcd cluster status Installing etcd Backing up etcd Restoring etcd Summary Mock CKA scenario-based practice test Scenario 1 Scenario 2 Scenario 3 Scenario 4 FAQs Part 2: Managing Kubernetes 4 Application Scheduling and Lifecycle Management Technical requirements The basics of Kubernetes workloads Imperative management versus declarative management Understanding pods Deploying and managing applications Deploying applications Performing rolling updates and rollbacks Rolling updates with kubectl Rollback Scaling applications ReplicaSets Workload scheduling Understanding namespaces Labels, node selectors, and annotations Node affinity and anti-affinity Taints and tolerations Resource management Configuring applications Manifest management with kustomize Common package management and templating with Helm Summary Mock CKA scenario-based practice test Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 FAQs 5 Demystifying Kubernetes Storage Technical requirements Stateful versus stateless workloads Kubernetes volumes Ephemeral storage Persistent storage Cracking stateful applications in Kubernetes Configuring an application with mounted storage Configuring an application with persistent storage Summary Mock CKA scenario-based practice test Scenario 1 Scenario 2 FAQs 6 Securing Kubernetes Technical requirements Securing Kubernetes in layers Kubernetes authentication and authorization Service accounts versus user accounts Kubernetes service accounts Organizing the cluster access using kubeconfig Configuring access to multiple clusters Kubernetes authorization Kubernetes RBAC Managing the security of Kubernetes applications Summary Mock CKA scenario-based practice test Scenario 1 Scenario 2 Scenario 3 FAQs 7 Demystifying Kubernetes Networking Technical requirements Understanding the Kubernetes networking model Container-to-container communication Pod-to-pod communication Pod-to-service and external-to-service communications Node-to-node communication Choosing an appropriate Container Network Interface plugin CNI networking in Kubernetes Decision metrics Configuring Ingress controllers and Ingress resources How Ingress and an Ingress controller works Using multiple Ingress controllers Work with Ingress resources Ingress annotations and rewrite-target Configuring and leveraging CoreDNS Check whether the CoreDNS server is up and running Pod IPs and DNS hostnames Service IPs and DNS hostnames Summary Mock CKA scenario-based practice test Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 FAQs Part 3: Troubleshooting 8 Monitoring and Logging Kubernetes Clusters and Applications Technical requirements Monitoring on a cluster node Checking whether Metrics Server is installed Installing Metrics Server in your current Kubernetes cluster Checking out CPU/memory metrics Monitoring applications on a Kubernetes cluster Monitoring the resource usage of an application Checking application details Monitoring cluster events Managing logs at the cluster node and Pod levels Cluster-level logging Checking out the node details Checking the node status Managing container stdout and stderr logs Summary Mock CKA scenario-based practice test Scenario 1 FAQs 9 Troubleshooting Cluster Components and Applications Technical requirements General practices in Kubernetes troubleshooting Troubleshooting cluster components Inspecting the cluster Inspecting the node Troubleshooting applications Getting a high-level view Inspecting namespace events Troubleshooting failing pods Troubleshooting init containers Summary FAQs 10 Troubleshooting Security and Networking Technical requirements Troubleshooting RBAC failures Initiating a minikube cluster Managing a minikube cluster Troubleshooting networking Troubleshooting a Kubernetes DNS server Troubleshooting a service in Kubernetes Get a shell for troubleshooting Summary FAQs Appendix - Mock CKA scenario-based practice test resolutions Chapter 2 – Installing and Configuring Kubernetes Clusters Scenario 1 Scenario 2 Scenario 3 (optional) Chapter 3 – Maintaining Kubernetes Clusters Scenario 1 Scenario 2 Scenario 3 Scenario 4 Chapter 4 – Application scheduling and lifecycle management Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Chapter 5 – Demystifying Kubernetes Storage Scenario 1 Scenario 2 Chapter 6 – Securing Kubernetes Scenario 1 Scenario 2 Scenario 3 Chapter 7 – Demystifying Kubernetes networking Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Chapter 8 – Monitoring and logging Kubernetes Clusters and Applications Scenario 1 Index Why subscribe? 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