Kubernetes Programming with Go : Programming Kubernetes Clients and Operators Using Go and the Kubernetes API / Philippe Martin.
Martin, Philippe, author.
2023
QA76.73.G63 M37 2023
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Title Kubernetes Programming with Go : Programming Kubernetes Clients and Operators Using Go and the Kubernetes API / Philippe Martin.
Author Martin, Philippe, author.
ISBN 9781484290262 electronic book
1484290267 electronic book
9781484290255
1484290259
DOI https://doi.org/10.1007/978-1-4842-9026-2
Published New York, NY : Apress L. P., [2023]
Language English
Description 1 online resource (xx, 316 pages) : illustrations
Item Number 10.1007/978-1-4842-9026-2 doi
Call Number QA76.73.G63 M37 2023
Dewey Decimal Classification 005.3
Summary This book begins by introducing the structure of the Kubernetes API and which operations it serves. Following chapters demonstrate how to write native Kubernetes resources definitions using Go structures defined in the API and API Machinery libraries. Miscellaneous utilities are described to help you work with different resource fields and to convert your resource definitions to or from YAML or JSON. Next, you will learn how to interact with the Kubernetes API server to create, delete, update, and monitor resources in a cluster using the client-go library. A complete chapter is devoted to tools provided to test your programs using the client-go library. An example follows to wrap up the first part of the book, describing how to write a kubectl plugin. Next, you will learn how to extend the Kubernetes API using Custom Resource Definitions, and how to write Kubernetes resources in a generic way as well as how to create your own resources using the unstructured concept. The next chapters delve into the controller-runtime library, useful for extending Kubernetes by writing operators, and the kubebuilder framework, which leverages this library, to help you start writing operators in minutes. After reading this book, you will have a deep understanding of the Kubernetes API's structure and how Kubernetes resources are organized within it, and have at your disposal a complete toolbox to help you write Kubernetes clients and operators. What You Will Learn Understand how the Kubernetes API and its resources are organized Write Kubernetes resources in Go Create resources in a cluster Leverage your newly-gained knowledge to write Kubernetes clients and operators Who is this Book for: Software engineers and (Site Reliability Engineers) SREs wishing to write Kubernetes clients and operators using the Go language.
Note Includes index.
Access Note Access limited to authorized users.
Source of Description Description based on online resource; title from digital title page (viewed on January 17, 2023).
Available in Other Form Kubernetes Programming with Go
Linked Resources Online Access
Record Appears in Online Resources > Ebooks
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Intro
Table of Contents
About the Author
About the Technical Reviewers
Acknowledgments
Introduction
Chapter 1: Kubernetes API Introduction
Kubernetes Platform at a Glance
OpenAPI Specification
Verbs and Kinds
Group-Version-Resource
Sub-resources
Official API Reference Documentation
The Deployment Documentation
Operations Documentation
The Pod Documentation
One-Page Version of the Documentation
Conclusion
Chapter 2: Kubernetes API Operations
Examining Requests
Making Requests
Using kubectl as a Proxy
Creating a Resource

Getting Information About a Resource
Getting the List of Resources
Cluster-wide
In a Specific namespace
Filtering the Result of a List
Using Label Selectors
Using Field Selectors
Deleting a Resource
Deleting a Collection of Resources
Updating a Resource
Managing Conflicts When Updating a Resource
Using a Strategic Merge Patch to Update a Resource
Patching Array Fields
Special Directives
replace Directive
delete Directive
deleteFromPrimitiveList Directive
setElementOrder Directive
Applying Resources Server-side
Watching Resources

Filtering During a Watch Session
Watching After Listing Resources
Restarting a watch Request
Allowing Bookmarks to Efficiently Restart a watch Request
Paginating Results
Consistency of the Full List
Detecting the Last Chunk
Getting Results in Various Formats
Getting Results as a Table
Column Definitions
Row Data
Using the YAML Format
Using the Protobuf Format
Conclusion
Chapter 3: Working with API Resources in Go
API Library Sources and Import
Content of a Package
types.go
register.go
doc.go
generated.pb.go and generated.proto

Types_swagger_doc_generated.go
zz_generated.deepcopy.go
Specific Content in core/v1
ObjectReference
ResourceList
Taint
Toleration
Well-Known Labels
Writing Kubernetes Resources in Go
Importing the Package
The TypeMeta Fields
The ObjectMeta Fields
Name
Namespace
UID, ResourceVersion, and Generation
Labels and Annotations
OwnerReferences
Setting APIVersion and Kind
Setting Controller
Setting BlockOwnerDeletion
Spec and Status
Comparison with Writing YAML Manifests
A Complete Example
Conclusion
Chapter 4: Using Common Types

Pointers
Getting the Reference of a Value
Dereferencing a Pointer
Comparing Two Referenced Values
Quantities
Parsing a String as Quantity
Using an inf.Dec as a Quantity
Using a Scaled Integer as a Quantity
Operations on Quantities
IntOrString
Time
Factory Methods
Operations on Time
Conclusion
Chapter 5: The API Machinery
The Schema Package
Scheme
Initialization
Mapping
Conversion
Adding Conversion Functions
Converting
Serialization
JSON and YAML Serializer
Protobuf Serializer
Encoding and Decoding
RESTMapper

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