piomin / sample-spring-boot-on-kubernetes

Spring Boot on Kubernetes Demo Project

Spring Boot on Kubernetes Demo Project

In this project I'm demonstrating different mechanisms of deploying application on Kubernetes. The example application application is simple Spring Boot app that exposes some HTTP endpoints for CRUD operations and connects to MongoDB on cluster.

Getting Started

Currently you may find here some examples of different techniques of deploying this application on Kubernetes. All the examples are described in a separated articles on my blog. Here's a full list of available examples:

1. Using Okteto Cloud Platform - Kubernetes for Developers. A detailed guide may be find in the following article: Development on Kubernetes with Okteto and Spring Boot

Mongo on Docker:

$ docker run --name mongodb -d -p 27017:27017 \
  -e MONGO_INITDB_ROOT_USERNAME=springboot \
  -e MONGO_INITDB_ROOT_PASSWORD=springboot123 \
  -e MONGO_INITDB_DATABASE=springboot \
  mongo:latest

Mongo for OpenShift:

$ oc new-app https://raw.githubusercontent.com/openshift/origin/master/examples/db-templates/mongodb-ephemeral-template.json 

sample-spring-boot-on-kubernetes's Issues

Dependency Dashboard

This issue lists Renovate updates and detected dependencies. Read the Dependency Dashboard docs to learn more.

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Detected dependencies

circleci

.circleci/config.yml

• cimg/openjdk 21.0.2

dockerfile

Dockerfile

• maven 3.8.6-openjdk-11
• openjdk 21-buster

gitlabci

.gitlab-ci.yml

maven

pom.xml

• org.springframework.boot:spring-boot-starter-parent 3.2.5
• org.instancio:instancio-junit 4.5.1
• org.testcontainers:testcontainers-bom 1.19.8
• org.jacoco:jacoco-maven-plugin 0.8.12
• com.google.cloud.tools:jib-maven-plugin 3.4.2

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`master` does no longer exist

A helm install using your configuration file fails as follows.

Error: template: jenkins/templates/deprecation.yaml:3:9: executing "jenkins/templates/deprecation.yaml" at <fail "`master` does no longer exist. It has been renamed to `controller`">: error calling fail: `master` does no longer exist. It has been renamed to `controller`

Error from kubeconfig credentials

The following is displayed when opening Jenkins in the browser after deploying it using the Helm chart and your configuration file (with appropriate changes for my credentials and to fix the previous issue I reported).

java.lang.IllegalArgumentException: No com.cloudbees.plugins.credentials.Credentials implementation found for kubeconfig
	at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.lambda$lookupDescriptor$11(HeteroDescribableConfigurator.java:211)
	at io.vavr.control.Option.orElse(Option.java:321)
	at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.lookupDescriptor(HeteroDescribableConfigurator.java:210)
	at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.lambda$configure$3(HeteroDescribableConfigurator.java:84)
	at io.vavr.Tuple2.apply(Tuple2.java:238)
	at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.configure(HeteroDescribableConfigurator.java:83)
	at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.configure(HeteroDescribableConfigurator.java:55)
	at io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator.tryConstructor(DataBoundConfigurator.java:152)
	at io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator.instance(DataBoundConfigurator.java:77)
	at io.jenkins.plugins.casc.BaseConfigurator.configure(BaseConfigurator.java:267)
	at io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator.check(DataBoundConfigurator.java:101)
	at io.jenkins.plugins.casc.BaseConfigurator.configure(BaseConfigurator.java:344)
	at io.jenkins.plugins.casc.BaseConfigurator.check(BaseConfigurator.java:287)
	at io.jenkins.plugins.casc.BaseConfigurator.configure(BaseConfigurator.java:351)
	at io.jenkins.plugins.casc.BaseConfigurator.check(BaseConfigurator.java:287)
	at io.jenkins.plugins.casc.ConfigurationAsCode.lambda$checkWith$8(ConfigurationAsCode.java:753)
	at io.jenkins.plugins.casc.ConfigurationAsCode.invokeWith(ConfigurationAsCode.java:689)
	at io.jenkins.plugins.casc.ConfigurationAsCode.checkWith(ConfigurationAsCode.java:753)
	at io.jenkins.plugins.casc.ConfigurationAsCode.configureWith(ConfigurationAsCode.java:738)
	at io.jenkins.plugins.casc.ConfigurationAsCode.configureWith(ConfigurationAsCode.java:614)
	at io.jenkins.plugins.casc.ConfigurationAsCode.configure(ConfigurationAsCode.java:298)
	at io.jenkins.plugins.casc.ConfigurationAsCode.init(ConfigurationAsCode.java:290)
Caused: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:104)
Caused: java.lang.Error
	at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110)
	at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:175)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296)
	at jenkins.model.Jenkins$5.runTask(Jenkins.java:1131)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused: org.jvnet.hudson.reactor.ReactorException
	at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:282)
	at jenkins.InitReactorRunner.run(InitReactorRunner.java:50)
	at jenkins.model.Jenkins.executeReactor(Jenkins.java:1164)
	at jenkins.model.Jenkins.<init>(Jenkins.java:964)
	at hudson.model.Hudson.<init>(Hudson.java:85)
	at hudson.model.Hudson.<init>(Hudson.java:81)
	at hudson.WebAppMain$3.run(WebAppMain.java:295)
Caused: hudson.util.HudsonFailedToLoad
	at hudson.WebAppMain$3.run(WebAppMain.java:312)