JCConf 2021 Access Kubernetes API in Java
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This document outlines a presentation on accessing the Kubernetes API in Java. It discusses the Kubernetes architecture and environment setup using Minikube and a sample Spring Boot app. It covers using the Kubernetes Java client to make API calls to get resources like pods and services. Examples are provided for building Docker images, deploying to Kubernetes using YAML, and configuring RBAC access control with service accounts and cluster roles. The presentation concludes with a recap of the key points around understanding the Kubernetes API and accessing it from Java applications.
![AHelloPod
apiVersion: v1
kind: Pod
metadata:
name: hello
spec:
containers:
- name: hello
image: busybox
imagePullPolicy: IfNotPresent
command: ["sh", "-c", "echo Hello JCConf Taiwan; sleep 2"]
restartPolicy: Never
AccessKubernetesAPIinJava](https://image.slidesharecdn.com/jcconf2021-access-kubernetes-api-in-java-211119023136/85/JCConf-2021-Access-Kubernetes-API-in-Java-13-320.jpg)
![apiVersion: v1
kind: ServiceAccount
metadata:
name: demo
namespace: default
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: demo
rules:
- apiGroups: [ "" ]
resources: [ "pods" ]
verbs: [ "get", "list", "watch", "create", "update", "patch", "delete" ]
- apiGroups: [ "" ]
resources: [ "events" ]
verbs: [ "list" ]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: demo
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: demo
subjects:
- kind: ServiceAccount
name: demo
namespace: default
AccessKubernetesAPIinJava](https://image.slidesharecdn.com/jcconf2021-access-kubernetes-api-in-java-211119023136/85/JCConf-2021-Access-Kubernetes-API-in-Java-20-320.jpg)
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JCConf 2021 Access Kubernetes API in Java
- 7. 環境準備 LocalKubernetescluster推薦:docker+minikube # Start the cluster $ minikube start # Configure environment to use minikube’s Docker daemon $ eval $(minikube docker-env) # Halt the cluster $ minikube stop AccessKubernetesAPIinJava
- 8. 環境準備 Asimplewebappw/SpringBoot $ curl https://start.spring.io/starter.zip -d dependencies=web,lombok,devtools -d bootVersion=2.5.7 -o demo.zip AccessKubernetesAPIinJava
- 9. 環境準備 Addthefollowingdependencytoyour pom.xml file: <dependency> <groupId>io.fabric8</groupId> <artifactId>kubernetes-client</artifactId> <version>5.10.1</version> </dependency> <!-- Optional --> <dependency> <groupId>org.springdoc</groupId> <artifactId>springdoc-openapi-ui</artifactId> <version>1.5.12</version> </dependency> AccessKubernetesAPIinJava
- 11. 起手式 try (var client = new DefaultKubernetesClient()) { client.{apiGroup}.{apiVersion}.{resource}.{verb}... } AccessKubernetesAPIinJava
- 12. kubectl get pod -n default kubectl get service -A kubectl get deploy -l my=label kubectl get cronjob myjob AccessKubernetesAPIinJava
- 13. AHelloPod apiVersion: v1 kind: Pod metadata: name: hello spec: containers: - name: hello image: busybox imagePullPolicy: IfNotPresent command: ["sh", "-c", "echo Hello JCConf Taiwan; sleep 2"] restartPolicy: Never AccessKubernetesAPIinJava
- 15. PackingImage mvn compile com.google.cloud.tools:jib-maven-plugin:3.1.4:dockerBuild -Djib.to.image=demo:1.0.0 # mvn spring-boot:build-image -Dspring-boot.build-image.imageName=demo:1.0.0 AccessKubernetesAPIinJava
- 16. Deploy apiVersion: apps/v1 kind: Deployment metadata: name: demo spec: selector: matchLabels: app: demo template: metadata: labels: app: demo spec: containers: - name: demo image: demo:1.0.0 AccessKubernetesAPIinJava
- 20. apiVersion: v1 kind: ServiceAccount metadata: name: demo namespace: default --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: demo rules: - apiGroups: [ "" ] resources: [ "pods" ] verbs: [ "get", "list", "watch", "create", "update", "patch", "delete" ] - apiGroups: [ "" ] resources: [ "events" ] verbs: [ "list" ] --- apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: demo roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: demo subjects: - kind: ServiceAccount name: demo namespace: default AccessKubernetesAPIinJava