Add Health simulator

.gitignore

@@ -0,0 +1 @@
+.idea

kubernetes-fabric8/README.md

@@ -1,6 +1,6 @@
 ## Spring Boot Admin - Kubernetes Example
 
-Allows to run Spring Boot Admin and one sample app (hello world) in kubernetes. Will guide you through all setup steps for the infrastructure.
+Allows to run Spring Boot Admin and two sample apps (hello world, health simulator) in kubernetes. Will guide you through all setup steps for the infrastructure.
 
 ## Enable Kubernetes in Docker Desktop
 
@@ -36,6 +36,7 @@ Allows to run Spring Boot Admin and one sample app (hello world) in kubernetes.
 
 - [./hello-world/README.md](./hello-world/README.md)
 - [./spring-boot-admin/README.md](./spring-boot-admin/README.md)
+- [./health-simulator/README.md](./health-simulator/README.md)
 
 ## Uninstall Apps
 

kubernetes-fabric8/health-simulator/.gitignore

@@ -0,0 +1,5 @@
+target
+.idea
+*.iml
+*.log
+*.gz

kubernetes-fabric8/health-simulator/Dockerfile

@@ -0,0 +1,8 @@
+# https://hub.docker.com/_/eclipse-temurin/
+FROM eclipse-temurin:17
+
+VOLUME /tmp
+
+COPY target/app.jar /opt/app/app.jar
+
+CMD ["bash", "-c", "java $JAVA_OPTS -jar /opt/app/app.jar"]

kubernetes-fabric8/health-simulator/README.md

@@ -0,0 +1,54 @@
+# Health Simulator
+
+App to simulate changes in health status. Spring Boot Admin reports these in the UI and with browser notifications (if you allow browser notifications).
+
+You can change the number of replicas in [deployment/values.yaml](deployment/values.yaml). Note that calls to http://localhost/health-simulator will reach a random pod if the number of replicas is greater than 0. Calls to http://localhost/health-simulator/up ... change the status of a random pod.
+
+## Build App
+
+ mvn clean install
+
+## Build Docker Image
+
+ docker build --tag health-simulator .
+
+## Install App
+
+ helm install health-simulator deployment
+
+### Check deployment
+
+ kubectl get pods -o wide
+ kubectl get services -o wide
+ kubectl get ingress
+
+### Uninstall
+
+ helm uninstall health-simulator
+
+## Build & Install Script
+
+ chmod u+x buildAndInstall.sh
+ ./buildAndInstall.sh
+
+## URI
+
+### Simulated health status
+
+- http://localhost/health-simulator
+
+### Change the health status
+
+- http://localhost/health-simulator/up
+- http://localhost/health-simulator/down
+- http://localhost/health-simulator/unknown
+- http://localhost/health-simulator/out_of_service
+
+## Access Actuator
+
+ kubectl get pods
+ kubectl port-forward <pod-name> 8081:8081
+
+### URI
+
+- http://localhost:8081/actuator

kubernetes-fabric8/health-simulator/buildAndInstall.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Uninstall App
+helm uninstall health-simulator
+# Build App
+mvn clean install
+# Build Docker Image
+docker build --tag health-simulator .
+# Install App
+helm install health-simulator deployment

kubernetes-fabric8/health-simulator/deployment/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+description: A Helm chart for Spring Boot services
+name: spring-boot-service
+version: 0.0.0

kubernetes-fabric8/health-simulator/deployment/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+ name: {{ .Values.name }}
+ namespace: {{ .Values.namespace }}
+ labels:
+ app: {{ .Values.name }}
+spec:
+ replicas: {{ .Values.deployment.replicas }}
+ strategy:
+ type: {{ .Values.deployment.updateStrategy }}
+ rollingUpdate:
+ maxUnavailable: {{ .Values.deployment.maxUnavailable }}
+ maxSurge: {{ .Values.deployment.maxSurge }}
+ selector:
+ matchLabels:
+ app: {{ .Values.name }}
+ template:
+ metadata:
+ labels:
+ app: {{ .Values.name }}
+ spec:
+ restartPolicy: {{ .Values.deployment.restartPolicy }}
+ containers:
+ - name: {{ .Values.name }}
+ image: {{ .Values.deployment.image }}
+ imagePullPolicy: {{ .Values.deployment.pullPolicy }}
+ {{- with .Values.deployment.env }}
+ env:
+ {{- range $env_var, $key := . }}
+ - name: {{ $env_var }}
+ value: "{{ $key }}"
+ {{- end }}
+ {{- end }}
+ ports:
+ - containerPort: 8080
+ name: http
+ protocol: TCP
+ - containerPort: 8081
+ name: management
+ protocol: TCP
+ livenessProbe:
+ httpGet:
+ path: /actuator/health/liveness
+ port: 8081
+ initialDelaySeconds: {{ .Values.deployment.livenessProbe.initialDelaySeconds }}
+ timeoutSeconds: {{ .Values.deployment.livenessProbe.timeoutSeconds }}
+ readinessProbe:
+ httpGet:
+ path: /actuator/health/readiness
+ port: 8081
+ initialDelaySeconds: {{ .Values.deployment.readinessProbe.initialDelaySeconds }}
+ timeoutSeconds: {{ .Values.deployment.readinessProbe.timeoutSeconds }}

kubernetes-fabric8/health-simulator/deployment/templates/ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+ name: {{ .Values.name }}
+ namespace: {{ .Values.namespace }}
+spec:
+ rules:
+ - http:
+ paths:
+ - path: /{{ .Values.name }}
+ pathType: Prefix
+ backend:
+ service:
+ name: {{ .Values.name }}
+ port:
+ name: http

kubernetes-fabric8/health-simulator/deployment/templates/service.yaml

@@ -0,0 +1,24 @@
+apiVersion: v1
+kind: Service
+metadata:
+ name: {{ .Values.name }}
+ namespace: {{ .Values.namespace }}
+ labels:
+ app: {{ .Values.name }}
+ # Filter discovery to tagged services
+ annotations:
+ spring-boot-admin: "true"
+spec:
+ ports:
+ - port: 8080
+ targetPort: http
+ protocol: TCP
+ # Name must be http or https
+ # Alternative: configure spring.cloud.kubernetes.discovery.primary-port-name
+ name: http
+ - port: 8081
+ targetPort: management
+ protocol: TCP
+ name: management
+ selector:
+ app: {{ .Values.name }}

kubernetes-fabric8/health-simulator/deployment/values.yaml

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+name: health-simulator
+namespace: default
+
+deployment:
+ env:
+ SERVER_SERVLET_CONTEXT_PATH: /health-simulator
+ image: health-simulator
+ # not recommended for production
+ pullPolicy: Never
+ updateStrategy: RollingUpdate
+ maxSurge: 100%
+ maxUnavailable: 0%
+ replicas: 1
+ restartPolicy: Always
+ livenessProbe:
+ initialDelaySeconds: 10
+ timeoutSeconds: 10
+ readinessProbe:
+ initialDelaySeconds: 10
+ timeoutSeconds: 10

kubernetes-fabric8/health-simulator/docker-compose.yml

@@ -0,0 +1,8 @@
+version: "3.7"
+
+services:
+ health-simulator:
+ image: health-simulator:latest
+ ports:
+ - 8080:8080
+ - 8081:8081

kubernetes-fabric8/health-simulator/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xmlns="http://maven.apache.org/POM/4.0.0"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <parent>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-parent</artifactId>
+ <version>3.0.6</version>
+ </parent>
+
+ <groupId>de.codecentric</groupId>
+ <artifactId>health-simulator</artifactId>
+ <packaging>jar</packaging>
+ <name>${project.artifactId}</name>
+ <version>1.0.0-SNAPSHOT</version>
+ <description>Simulate Health Checks</description>
+
+ <properties>
+ <java.version>17</java.version>
+ <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+ </properties>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-web</artifactId>
+ </dependency>
+
+ <!-- Actuator -->
+ <dependency>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-starter-actuator</artifactId>
+ </dependency>
+
+ <!-- Supporting -->
+ <dependency>
+ <groupId>org.projectlombok</groupId>
+ <artifactId>lombok</artifactId>
+ <scope>provided</scope>
+ </dependency>
+ </dependencies>
+
+ <build>
+ <finalName>app</finalName>
+ <plugins>
+ <plugin>
+ <groupId>org.springframework.boot</groupId>
+ <artifactId>spring-boot-maven-plugin</artifactId>
+ <executions>
+ <execution>
+ <id>repackage</id>
+ <goals>
+ <goal>repackage</goal>
+ <!-- Build-Infos for Info-Actuator -->
+ <goal>build-info</goal>
+ </goals>
+ </execution>
+ </executions>
+ </plugin>
+ <!-- GIT-Infos for Info-Actuator -->
+ <plugin>
+ <groupId>io.github.git-commit-id</groupId>
+ <artifactId>git-commit-id-maven-plugin</artifactId>
+ <configuration>
+ <offline>true</offline>
+ </configuration>
+ </plugin>
+ </plugins>
+ </build>
+
+</project>

kubernetes-fabric8/health-simulator/src/main/java/de/codecentric/healthsimulator/SimulateHealthApplication.java

@@ -0,0 +1,12 @@
+package de.codecentric.healthsimulator;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SimulateHealthApplication {
+
+ public static void main(String... args) {
+ SpringApplication.run(SimulateHealthApplication.class);
+ }
+}

kubernetes-fabric8/health-simulator/src/main/java/de/codecentric/healthsimulator/health/HealthController.java

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+package de.codecentric.healthsimulator.health;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.boot.actuate.health.Status;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+public class HealthController {
+
+ private final HealthIndicatorSimulation healthIndicatorSimulation;
+
+ @GetMapping("/")
+ public Status status() {
+ return healthIndicatorSimulation.getStatus();
+ }
+
+ @GetMapping("/up")
+ public Status up() {
+ healthIndicatorSimulation.setStatus(Status.UP);
+ return healthIndicatorSimulation.getStatus();
+ }
+
+ @GetMapping("/down")
+ public Status down() {
+ healthIndicatorSimulation.setStatus(Status.DOWN);
+ return healthIndicatorSimulation.getStatus();
+ }
+
+ @GetMapping("/unknown")
+ public Status unknown() {
+ healthIndicatorSimulation.setStatus(Status.UNKNOWN);
+ return healthIndicatorSimulation.getStatus();
+ }
+
+ @GetMapping("/out_of_service")
+ public Status outOfService() {
+ healthIndicatorSimulation.setStatus(Status.OUT_OF_SERVICE);
+ return healthIndicatorSimulation.getStatus();
+ }
+}

kubernetes-fabric8/health-simulator/src/main/java/de/codecentric/healthsimulator/health/HealthIndicatorSimulation.java

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+package de.codecentric.healthsimulator.health;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthIndicator;
+import org.springframework.boot.actuate.health.Status;
+import org.springframework.stereotype.Component;
+
+@Component
+@Getter
+@Setter
+public class HealthIndicatorSimulation implements HealthIndicator {
+
+ private Status status = Status.UP;
+
+ @Override
+ public Health health() {
+ return Health.status(status).withDetail("Simulated", "health status").build();
+ }
+}