Becoming a Kubernetes administrator is a big accomplishment—and passing the Certified Kubernetes Administrator (CKA) exam can be a big boost to your career! Learn the hands on skills you need to ace the exam with clear teaching and hands-on exercises that match the unique CKA test environment.
In Acing the Certified Kubernetes Administrator Exam you’ll learn how to
Administer an application running on Kubernetes
Troubleshoot errors inside a Kubernetes cluster
Authenticate users and machines to the Kubernetes API
Create persistent storage in Kubernetes
Add additional functionality to an existing Kubernetes cluster
Acing the Certified Kubernetes Administrator Exam is your fast-track to becoming a Certified Kubernetes Administrator! Your expert exam tutor is Chad Crowell, whose courses have helped thousands of developers to understand Kubernetes and earn the coveted CKA certification. If you’re familiar with Kubernetes, this book will ensure you’re ready to pass in just one month of study. If you’re brand new, this is the perfect primer to get started on your Kubernetes journey.
Go hands-on with all the exam objectives, including deploying containerized applications to Kubernetes, accessing an application from an ingress resource, and backup and restore. Plus, essential exam tips and exercises help you work out your mental muscle memory.
About the technology
The Certified Kubernetes Administrator (CKA) exam proves to your next employer that you can set up and manage Kubernetes clusters. In this rigorous test offered by the Linux Foundation, you’ll configure and manage production-grade clusters hands-on as a proctor watches. Simply put, if you aren’t ready, you won’t pass.
About the book
Acing the Certified Kubernetes Administrator Exam teaches every skill you need to pass the CKA. You can’t “hack” this exam by learning a few test-taking tricks. Instead, you’ll master vital techniques like load balancing and networking with carefully designed exercises that you practice using the CKA’s command-line interface. With this book, you’ll be confident and ready for exam day.
What's inside
Administer an application on Kubernetes
Troubleshoot errors in a Kubernetes cluster
Authenticate users and machines
Create persistent storage
About the reader
For readers who know the basics of containers and Linux admin. No Kubernetes experience required.
About the author
Chad M. Crowell is the author of dozens of courses on Kubernetes and DevOps with Pluralsight and INE. Chad is also a Microsoft Certified Trainer (MCT).
Author(s): Chad M. Crowell
Publisher: Manning Publications Co.
Year: 2023
Language: English
Pages: 386
inside front cover
Acing the Certified Kubernetes Administrator Exam
Copyright
dedication
contents
front matter
preface
acknowledgments
about this book
Who should read this book
How this book is organized: A road map
About the exercises
About the code
liveBook discussion forum
Other online resources
about the author
about the cover illustration
1 First steps
1.1 Introducing the CKA exam
1.2 What’s in store
1.2.1 What is a Kubernetes administrator?
1.3 Meeting Kubernetes
1.3.1 Cluster architecture, installation, and configuration
1.3.2 Workloads and scheduling
1.3.3 Services and networking
1.3.4 Storage
1.3.5 Troubleshooting
1.4 Control plane node
1.5 Worker nodes
1.6 API model and PKI
1.7 Linux system services
1.8 Declarative syntax
1.9 Exam exercises
Summary
2 Kubernetes cluster
2.1 Kubernetes cluster components
2.1.1 Kubernetes version upgrade
2.1.2 The control plane
2.1.3 Taints and tolerations
2.1.4 Nodes
2.2 Datastore etcd
2.2.1 Working with etcdctl
2.2.2 Client and server certificates
2.3 Exam exercises
Summary
3 Identity and access management
3.1 Role-based access control
3.1.1 Roles and Role bindings
3.1.2 System Roles and groups
3.2 Users and groups
3.3 Service Accounts
Summary
4 Deploying applications in Kubernetes
4.1 Scheduling applications
4.1.1 Node selectors
4.1.2 Node and Pod affinity
4.2 Using Helm
4.3 Pod metadata
4.3.1 Resource requests and limits
4.3.2 Multicontainer Pods
4.3.3 ConfigMaps and Secrets
Summary
5 Running applications in Kubernetes
5.1 Orchestrating applications
5.1.1 Modifying running applications
5.1.2 Application maintenance
5.1.3 Application rollouts
5.1.4 Exposing Deployments
5.2 Application maintenance
5.2.1 Cordoning and draining nodes
5.2.2 Adding application resources (nodes)
Summary
6 Communication in a Kubernetes cluster
6.1 Configuring DNS
6.2 CoreDNS
6.2.1 Config files
6.2.2 Replicating DNS
6.2.3 Pod-to-Pod connectivity
6.3 Ingress and Ingress controllers
6.4 Services
6.4.1 ClusterIP Service
6.4.2 NodePort Service
6.4.3 LoadBalancer Service
6.5 Cluster node networking configuration
Summary
7 Storage in Kubernetes
7.1 Persistent volumes
7.1.1 The problem with hostPath
7.1.2 Volume modes
7.1.3 Access modes
7.1.4 Reclaim policies
7.2 Persistent volume claim
7.3 Storage class
7.3.1 Inheriting from the storage class
7.4 Nonpersistent volumes
Summary
8 Troubleshooting Kubernetes
8.1 Understanding application logs
8.1.1 Container log detail
8.1.2 Troubleshooting from inside the container
8.2 Cluster component failure
8.2.1 Troubleshooting cluster events
8.2.2 Worker node failure
8.2.3 Did you specify the right host or port?
8.2.4 Troubleshooting kubeconfig
8.3 Network troubleshooting
8.3.1 Troubleshooting the config
8.3.2 Troubleshooting Services
8.3.3 Troubleshooting cluster-wide communications
Summary
9 Taking the test
9.1 Exam basics
9.1.1 Competencies condensed
9.1.2 Exam clusters
9.2 Chapter reviews
9.2.1 Quick review of chapter 2
9.2.2 Quick review of chapter 3
9.2.3 Quick review of chapter 4
9.2.4 Quick review of chapter 5
9.2.5 Quick review of chapter 6
9.2.6 Quick review of chapter 7
9.2.7 Quick review of chapter 8
9.3 Kubernetes documentation review
9.4 Practice exam
9.5 Additional tips for the exam
Summary
Appendix A. Creating a Kubernetes cluster with kind
A.1 Installing the required packages
A.1.1 Install Docker Desktop
A.1.2 Installing kind
A.1.3 Creating a kind Kubernetes cluster
A.1.4 Install kubectl (optional)
A.2 Creating a multinode cluster
A.3 Advanced configuration for kind
Appendix B. Setting the context for a kind cluster
B.1 Setting the context with kubeconfig
B.2 Setting an alias for kubectl
B.3 Setting kubectl autocomplete
Appendix C. Installing a CNI in a kind cluster
C.1 Creating a kind cluster without CNI
C.2 Installing a bridge CNI plugin
C.3 Installing Flannel CNI
C.4 Creating a new kind cluster
C.5 Installing the Calico CNI
Appendix D. Solving the exam practice exercises
D.1 Chapter 1 exam exercises
D.1.1 Listing API resources
D.1.2 Listing services
D.1.3 The status of the kubelet service
D.1.4 Using declarative syntax
D.1.5 Listing Kubernetes services
D.2 Chapter 2 exam exercises
D.2.1 Shortening the kubectl command
D.2.2 Listing running Pods
D.2.3 Viewing the kubelet client certificate
D.2.4 Backing up etcd
D.2.5 Restoring etcd
D.2.6 Upgrading the control plane
D.3 Chapter 3 exam exercises
D.3.1 Creating a Role
D.3.2 Create a role binding
D.3.3 Creating a new user
D.3.4 Adding Sandra to kubeconfig
D.3.5 Creating a new Service Account
D.3.6 Creating a new cluster role
D.4 Chapter 4 exam exercises
D.4.1 Applying a label and creating a Pod
D.4.2 Editing a running Pod
D.4.3 Using node affinity for a new Pod
D.5 Chapter 5 exam exercises
D.5.1 Scaling replicas in a Deployment
D.5.2 Updating the image
D.5.3 Viewing ReplicaSet events
D.5.4 Rolling back to a previous app version
D.5.5 Changing the rollout strategy
D.5.6 Cordoning and uncordoning a node
D.5.7 Removing a taint from a node
D.6 Chapter 6 exam exercises
D.6.1 exec-ing into a Pod
D.6.2 Changing the DNS service
D.6.3 Changing the kubelet configuration
D.6.4 Editing the kubelet ConfigMap
D.6.5 Scaling the CoreDNS Deployment
D.6.6 Verifying DNS changes from a Pod
D.6.7 Creating a Deployment and Service
D.6.8 Changing the ClusterIP Service to NodePort
D.6.9 Installing Ingress controller and Ingress resource
D.6.10 Installing a container network interface (CNI)
D.7 Chapter 7 exam exercises
D.7.1 Creating a persistent volume
D.7.2 Creating a persistent volume claim
D.7.3 Creating a Pod to use the claim
D.7.4 Creating a storage class
D.7.5 Creating a persistent volume claim for a storage class
D.7.6 Creating a Pod from a storage class
D.8 Chapter 8 exam exercises
D.8.1 Fixing the Pod YAML
D.8.2 Fixing the Pod image
D.8.3 Fixing a completed Pod
D.8.4 Fixing the Kubernetes scheduler
D.8.5 Fixing the kubelet
index
