Initial Commit

.gitignore

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+**/*.iml
+**/.idea
+**/*.vagrant
+**/*-cloudimg-console.log

README.md

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+# Workshop for deploying classic simple application
+
+Small project SpringBoot/Angular just for testing purpose
+
+## Goal
+
+Deploy this small project into a Kubernetes cluster
+
+## How
+
+1. Create docker image for `backend` and `frontend` 
+2. Push to a docker registry
+3. Write kubernetes descriptor for `backend` and `frontend`
+4. Apply descriptors
+
+### Tips
+
+♻ Don't hesitate to modify some code if necessary

backend/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+
+### VS Code ###
+.vscode/

backend/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://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>2.3.0.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.github.pcavezzan.kubernetes.workshop</groupId>
+	<artifactId>backend</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>Spring Boot Angular - Backend</name>
+	<description>Backend JAVA for this small project Spring Boot Angular to deploy on Kubernetes</description>
+
+	<properties>
+		<java.version>11</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

backend/src/main/java/com/github/pcavezzan/kubernetes/workshop/BackendApplication.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.web.ServerProperties;
+import org.springframework.context.annotation.Bean;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+@SpringBootApplication
+@Slf4j
+public class BackendApplication {
+
+	@Value("${backend.messages.welcome}")
+	private String welcomeMsg;
+
+	public static void main(String[] args) {
+		SpringApplication.run(BackendApplication.class, args);
+	}
+
+	@Bean
+	public String serverHostName(ServerProperties serverProperties) {
+		InetAddress address = serverProperties.getAddress();
+		if (address == null) {
+			// We did not set any binding address
+			try {
+				address = InetAddress.getLocalHost();
+			} catch (UnknownHostException e) {
+				log.warn("Could not get address from localhost, will use loopback instead");
+				address = InetAddress.getLoopbackAddress();
+			}
+		}
+		return address.getHostName();
+	}
+
+	@Bean
+	public MessageService messageService(String serverHostName) {
+		return new MessageService(welcomeMsg, serverHostName);
+	}
+}
+

backend/src/main/java/com/github/pcavezzan/kubernetes/workshop/Message.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import lombok.Data;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@Data
+class Message {
+	private final String payload;
+
+}

backend/src/main/java/com/github/pcavezzan/kubernetes/workshop/MessageService.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+class MessageService {
+
+	private final String welcomeMsg;
+	private final String serverHostName;
+
+	public Message getWelcomeMsg() {
+		return new Message(welcomeMsg);
+	}
+
+	public Message getServerHostName() {
+		return new Message(serverHostName);
+	}
+
+}

backend/src/main/java/com/github/pcavezzan/kubernetes/workshop/WelcomeResource.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.annotation.PostConstruct;
+import java.net.InetAddress;
+
+@RestController
+@RequestMapping("/welcome")
+@Slf4j
+class WelcomeResource {
+
+    @Autowired
+    private MessageService messageService;
+
+    @Autowired
+    private String serverHostName;
+
+    @GetMapping
+    public Message get() {
+        log.info("{} - incoming request for getting message", serverHostName);
+        return messageService.getWelcomeMsg();
+    }
+}

backend/src/main/java/com/github/pcavezzan/kubernetes/workshop/WhoamiResource.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/whoami")
+@Slf4j
+public class WhoamiResource {
+
+    @Autowired
+    private MessageService messageService;
+
+    @GetMapping
+    public Message get() {
+        return messageService.getServerHostName();
+    }
+}

backend/src/main/resources/application.properties

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+spring.application.name=backend
+
+backend.messages.welcome=Hello World inside ${spring.application.name}

backend/src/test/java/com/github/pcavezzan/kubernetes/workshop/BackendApplicationTest.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+class BackendApplicationTest {
+
+	@Test
+	void contextLoads() {
+	}
+}

backend/src/test/java/com/github/pcavezzan/kubernetes/workshop/MessageServiceITCase.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+class MessageServiceITCase {
+
+    @Autowired
+    private MessageService messageService;
+
+    @Test
+    void getWelcomeMsgShouldReturnHelloWorld() {
+        final Message welcomeMsg = messageService.getWelcomeMsg();
+        assertThat(welcomeMsg).isEqualTo(new Message("** Hello World **"));
+    }
+
+    @Test
+    void getServerHostNameShouldReturnLocalhost() {
+        final Message serverHostName = messageService.getServerHostName();
+        assertThat(serverHostName).isEqualTo(new Message("localhost"));
+    }
+}

backend/src/test/java/com/github/pcavezzan/kubernetes/workshop/MessageServiceTestCase.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MessageServiceTestCase {
+
+    private final MessageService messageService = new MessageService("Foo Bar", "localhost");
+
+    @Test
+    void getWelcomeMsg() {
+        assertThat(messageService.getWelcomeMsg()).isEqualTo(new Message("Foo Bar"));
+    }
+
+    @Test
+    void getServerHostName() {
+        assertThat(messageService.getServerHostName()).isEqualTo(new Message("localhost"));
+    }
+}

backend/src/test/java/com/github/pcavezzan/kubernetes/workshop/WelcomeResourceITCase.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.ResultActions;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+public class WelcomeResourceITCase {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    public void getShouldReturnHelloWorld() throws Exception {
+        final ResultActions resultActions = this.mockMvc.perform(get("/welcome"));
+
+        resultActions.andExpect(status().isOk())
+                .andExpect(content().string(equalTo("{\"payload\":\"** Hello World **\"}")));
+    }
+
+}

backend/src/test/java/com/github/pcavezzan/kubernetes/workshop/WelcomeResourceTestCase.java

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+package com.github.pcavezzan.kubernetes.workshop;
+
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.ResultActions;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(WelcomeResource.class)
+public class WelcomeResourceTestCase {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private MessageService service;
+
+    @Test
+    public void getShouldReturnHelloWorld() throws Exception {
+        when(service.getWelcomeMsg()).thenReturn(new Message("Hello World"));
+
+        final ResultActions resultActions = this.mockMvc.perform(get("/welcome"));
+
+        resultActions.andExpect(status().isOk())
+                .andExpect(content().string(equalTo("{\"payload\":\"Hello World\"}")));
+    }
+
+}