... Preface ... 13
... Structure ... 15
... Book Resources ... 19
1 ... Introduction to Kubernetes ... 21
1.1 ... Basic Principles and Concepts: Why Use Container Clusters at All? ... 21
1.2 ... Kubernetes, the Tool of Choice ... 34
1.3 ... Architecture and Components ... 45
1.4 ... A Kubernetes Cluster on Your Computer ... 53
1.5 ... Interaction with Kubernetes via the Command Line and Dashboard ... 61
1.6 ... Lens: The IDE for Kubernetes ... 81
1.7 ... The Kubernetes Cluster from Raspberry Pis ... 89
2 ... Basic Objects and Concepts in Kubernetes ... 95
2.1 ... Pod and Container Management ... 98
2.2 ... Annotations and Labels ... 118
2.3 ... Deployments and ReplicaSets ... 138
2.4 ... ConfigMaps and Secrets ... 152
2.5 ... Establishing a Communication with Services and an Ingress ... 171
3 ... Everything as Code: Tools and Principles for Kubernetes Operations ... 187
3.1 ... Declarative Configurations ... 188
3.2 ... YAML: The Language for Kubernetes ... 192
3.3 ... Version Management of Kubernetes Manifests ... 200
3.4 ... Continuous Integration and Continuous Delivery ... 213
3.5 ... Templating Using Kustomize ... 225
4 ... Advanced Objects and Concepts in Kubernetes ... 235
4.1 ... DaemonSets ... 236
4.2 ... Jobs in Kubernetes ... 239
4.3 ... Custom Resources and Custom Resource Definitions ... 248
4.4 ... Downward API ... 258
4.5 ... Pod Priority and Preemption ... 261
4.6 ... Versioning Objects in Kubernetes ... 263
5 ... Stateful Applications and Storage ... 265
5.1 ... Stateful Applications in Kubernetes through StatefulSets ... 266
5.2 ... Persistent Volumes and Persistent Volume Claims ... 273
5.3 ... Ephemeral Volumes ... 289
5.4 ... Other Features of Volumes ... 291
6 ... Kubernetes Governance and Security: Prepare for Production ... 299
6.1 ... Pod Security ... 301
6.2 ... Pod Security Admission ... 304
6.3 ... Admission Controller ... 306
6.4 ... Kubernetes Policies ... 308
6.5 ... Policy Objects ... 311
6.6 ... Role-Based Access Control in Kubernetes ... 313
7 ... Developing Applications for Kubernetes: Ready for Production ... 321
7.1 ... Managing Pod Resources ... 322
7.2 ... Readiness, Liveness, and Startup Probes ... 325
7.3 ... Scaling and Load Balancing ... 335
7.4 ... Monitoring ... 342
8 ... Orchestrating Kubernetes Using Helm ... 357
8.1 ... Helm: The Kubernetes Package Manager ... 358
8.2 ... Reading and Developing Helm Charts ... 368
8.3 ... Developing Custom Charts ... 385
8.4 ... Conclusion ... 394
... The Author ... 395
... Index ... 397
