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spencergibb
2023-09-19 13:10:02 -04:00
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102
spring-cloud-kubernetes-examples/.flattened-pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!--
~ Copyright 2013-2018 the original author or authors.
~
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~
~ https://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
~
-->
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes</artifactId>
<version>3.0.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<version>3.0.4-SNAPSHOT</version>
<packaging>pom</packaging>
<name>Spring Cloud Kubernetes :: Examples</name>
<description>Examples showing how to use features of Spring Cloud Kubernetes.</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples</url>
</scm>
</project>

124
spring-cloud-kubernetes-examples/kubernetes-hello-world-example/.flattened-pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<version>2.1.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>kubernetes-hello-world</artifactId>
<version>2.1.4-SNAPSHOT</version>
<name>Spring Cloud Kubernetes :: Examples :: Hello World</name>
<description>A simple example that demonstrates how to build and test a basic spring
cloud kubernetes app</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples/kubernetes-hello-world</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-hello-world</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-hello-world</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/kubernetes-hello-world</url>
</scm>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-fabric8-autoconfig</artifactId>
<version>2.1.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-fabric8-discovery</artifactId>
<version>2.1.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-commons</artifactId>
<version>3.1.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

105
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/.flattened-pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<version>3.0.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>kubernetes-leader-election-example</artifactId>
<version>3.0.4-SNAPSHOT</version>
<name>Spring Cloud Kubernetes :: Examples :: Leader Election</name>
<description>Leader election demonstration with Spring Integration and ConfigMap</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples/kubernetes-leader-election-example</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-leader-election-example</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-leader-election-example</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/kubernetes-leader-election-example</url>
</scm>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>3.0.7</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>3.0.7</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-fabric8-leader</artifactId>
<version>3.0.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

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spring-cloud-kubernetes-examples/kubernetes-leader-election-example/README.md
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@@ -1,168 +0,0 @@
# Spring Cloud Kubernetes leader election example
## Setting up the Environment
This example uses a Fabric8 Maven Plugin to deploy an application to a Kubernetes cluster.
To try it locally, download and install [Minikube](https://minikube.sigs.k8s.io/docs/start/).
Once Minikube is downloaded, start it with the following command:
```
minikube start
```
And configure environment variables to point to the Minikube's Docker daemon:
```
eval $(minikube docker-env)
```
## Overview
Spring Cloud Kubernetes leader election mechanism implements leader election API of Spring Integration using Kubernetes ConfigMap.
Multiple instances of the same application compete for a leadership of a specified role.
But only one of them can become a leader and receive an `OnGrantedEvent` application event with a leadership `Context`.
All the instances periodically try to get a leadership and whichever comes first - becomes a leader.
The new leader will remain until either its instance disappears from the cluster or it yields its leadership.
Once the leader is gone, any of the existing instances can become a new leader (even the previous leader if it yielded leadership but stayed in the cluster).
And finally, if the leadership is yielded or revoked for some reason, the old leader receives `OnRevokedEvent` application event.
## Example application usage
Leader election mechanism uses Kubernetes ConfigMap feature to coordinate leadership information.
To access ConfigMap user needs correct role and role binding.
Create them using the following commands:
```
kubectl apply -f leader-role.yml
kubectl apply -f leader-rolebinding.yml
```
Build an image using the Spring Boot Build Image Plugin
```
./mvnw spring-boot:build-image -Dspring-boot.build-image.imageName=org/kubernetes-leader-election-example
```
You can then deploy the application using the following yaml.
```yaml
---
apiVersion: v1
kind: List
items:
- apiVersion: v1
kind: Service
metadata:
labels:
app: kubernetes-leader-election-example
name: kubernetes-leader-election-example
spec:
ports:
- name: http
port: 80
targetPort: 8080
selector:
app: kubernetes-leader-election-example
type: ClusterIP
- apiVersion: v1
kind: ServiceAccount
metadata:
labels:
app: kubernetes-leader-election-example
name: kubernetes-leader-election-example
- apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
app: kubernetes-leader-election-example
name: kubernetes-leader-election-example:view
roleRef:
kind: Role
apiGroup: rbac.authorization.k8s.io
name: namespace-reader
subjects:
- kind: ServiceAccount
name: kubernetes-leader-election-example
- apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: default
name: namespace-reader
rules:
- apiGroups: ["", "extensions", "apps"]
resources: ["configmaps", "pods", "services", "endpoints", "secrets"]
verbs: ["get", "list", "watch"]
- apiVersion: apps/v1
kind: Deployment
metadata:
name: kubernetes-leader-election-example
spec:
selector:
matchLabels:
app: kubernetes-leader-election-example
template:
metadata:
labels:
app: kubernetes-leader-election-example
spec:
serviceAccountName: kubernetes-leader-election-example
containers:
- name: kubernetes-leader-election-example
image: org/kubernetes-leader-election-example:latest
imagePullPolicy: IfNotPresent
readinessProbe:
httpGet:
port: 8080
path: /actuator/health/readiness
livenessProbe:
httpGet:
port: 8080
path: /actuator/health/liveness
ports:
- containerPort: 8080
```
This will deploy a single application instance to the cluster and that instance will automatically become a leader.
Create an environment variable for an easier application access:
```
SERVICE_URL=$(minikube service kubernetes-leader-election-example --url)
```
Get leadership information:
```
curl $SERVICE_URL
```
You should receive a message like this:
```
I am 'kubernetes-leader-election-example-1234567890-abcde' and I am the leader of the 'world'
```
Yield the leadership:
```
curl -X PUT $SERVICE_URL
```
And check the leadership information again:
```
curl $SERVICE_URL
```
Now you should receive a message like this:
```
I am 'kubernetes-leader-election-example-1234567890-abcde' but I am not a leader of the 'world'
```
If you wouldn't do anything for a few seconds, the same instance will become a leader again because it only yielded its leadership but stayed in the cluster.
Now scale the application to two instances and try all the steps again:
```
kubectl scale --replicas=2 deployment.apps/kubernetes-leader-election-example
```
> Note: with multiple replicas in the cluster, `curl` command will access one of them depending on the Kubernetes load balancing configuration.
Thus, when trying to yield the leadership, request might go to a non-leader node first. Just execute command again until it reaches the correct node.
> Note: instances periodically try to acquire leadership and Spring Cloud Kubernetes doesn't decide which one of them is more worth to become one.
Thus, it is possible that the instance which just yielded the leadership, made another leadership take over request faster than another instances and became a leader again.

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spring-cloud-kubernetes-examples/kubernetes-leader-election-example/leader-role.yml
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apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: leader
labels:
app: kubernetes-leader-election-example
group: org.springframework.cloud
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- watch
- get
- apiGroups:
- ""
resources:
- configmaps
verbs:
- watch
- get
- update
# resourceNames:
# - <config-map name>

15
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/leader-rolebinding.yml
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apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
app: kubernetes-leader-election-example
group: org.springframework.cloud
name: leader
roleRef:
apiGroup: ""
kind: Role
name: leader
subjects:
- kind: ServiceAccount
name: default
apiGroup: ""

87
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<version>3.1.0-SNAPSHOT</version>
</parent>
<artifactId>kubernetes-leader-election-example</artifactId>
<name>Spring Cloud Kubernetes :: Examples :: Leader Election</name>
<description>Leader election demonstration with Spring Integration and ConfigMap
</description>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<type>pom</type>
<scope>import</scope>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-fabric8-leader</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-fabric8-leader</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<version>${maven-deploy-plugin.version}</version>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
</plugin>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.22.2</version>
</plugin>
</plugins>
</build>
</project>

29
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/src/main/java/org/springframework/cloud/kubernetes/examples/App.java
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@@ -1,29 +0,0 @@
/*
* Copyright 2018-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.kubernetes.examples;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}

99
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/src/main/java/org/springframework/cloud/kubernetes/examples/LeaderController.java
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@@ -1,99 +0,0 @@
/*
* Copyright 2013-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.kubernetes.examples;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.event.EventListener;
import org.springframework.http.ResponseEntity;
import org.springframework.integration.leader.Context;
import org.springframework.integration.leader.event.OnGrantedEvent;
import org.springframework.integration.leader.event.OnRevokedEvent;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class LeaderController {
private final String host;
@Value("${spring.cloud.kubernetes.leader.role}")
private String role;
private Context context;
public LeaderController() throws UnknownHostException {
this.host = InetAddress.getLocalHost().getHostName();
}
/**
* Return a message whether this instance is a leader or not.
* @return info
*/
@GetMapping
public String getInfo() {
if (this.context == null) {
return String.format("I am '%s' but I am not a leader of the '%s'", this.host, this.role);
}
return String.format("I am '%s' and I am the leader of the '%s'", this.host, this.role);
}
/**
* PUT request to try and revoke a leadership of this instance. If the instance is not
* a leader, leadership cannot be revoked. Thus "HTTP Bad Request" response. If the
* instance is a leader, it must have a leadership context instance which can be used
* to give up the leadership.
* @return info about leadership
*/
@PutMapping
public ResponseEntity<String> revokeLeadership() {
if (this.context == null) {
String message = String.format("Cannot revoke leadership because '%s' is not a leader", this.host);
return ResponseEntity.badRequest().body(message);
}
this.context.yield();
String message = String.format("Leadership revoked for '%s'", this.host);
return ResponseEntity.ok(message);
}
/**
* Handle a notification that this instance has become a leader.
* @param event on granted event
*/
@EventListener
public void handleEvent(OnGrantedEvent event) {
System.out.println(String.format("'%s' leadership granted", event.getRole()));
this.context = event.getContext();
}
/**
* Handle a notification that this instance's leadership has been revoked.
* @param event on revoked event
*/
@EventListener
public void handleEvent(OnRevokedEvent event) {
System.out.println(String.format("'%s' leadership revoked", event.getRole()));
this.context = null;
}
}

4
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/src/main/resources/application.properties
View File

@@ -1,4 +0,0 @@
# Role to which leader election this instance will participate
spring.cloud.kubernetes.leader.role=world
# Configmap to which leader election metadata will be saved
spring.cloud.kubernetes.leader.config-map-name=leader

111
spring-cloud-kubernetes-examples/kubernetes-leader-election-example/src/test/java/org/springframework/cloud/kubernetes/examples/LeaderControllerTest.java
View File

@@ -1,111 +0,0 @@
/*
* Copyright 2013-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.kubernetes.examples;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.integration.leader.Context;
import org.springframework.integration.leader.event.OnGrantedEvent;
import org.springframework.integration.leader.event.OnRevokedEvent;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.BDDMockito.given;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
@ExtendWith(MockitoExtension.class)
public class LeaderControllerTest {
@Mock
private OnGrantedEvent mockOnGrantedEvent;
@Mock
private OnRevokedEvent mockOnRevokedEvent;
@Mock
private Context mockContext;
private String host;
private LeaderController leaderController;
@BeforeEach
public void before() throws UnknownHostException {
this.host = InetAddress.getLocalHost().getHostName();
this.leaderController = new LeaderController();
}
@Test
public void shouldGetNonLeaderInfo() {
String message = String.format("I am '%s' but I am not a leader of the 'null'", this.host);
assertThat(this.leaderController.getInfo()).isEqualTo(message);
}
@Test
public void shouldHandleGrantedEvent() {
given(this.mockOnGrantedEvent.getContext()).willReturn(this.mockContext);
this.leaderController.handleEvent(this.mockOnGrantedEvent);
String message = String.format("I am '%s' and I am the leader of the 'null'", this.host);
assertThat(this.leaderController.getInfo()).isEqualTo(message);
}
@Test
public void shouldHandleRevokedEvent() {
given(this.mockOnGrantedEvent.getContext()).willReturn(this.mockContext);
this.leaderController.handleEvent(this.mockOnGrantedEvent);
this.leaderController.handleEvent(this.mockOnRevokedEvent);
String message = String.format("I am '%s' but I am not a leader of the 'null'", this.host);
assertThat(this.leaderController.getInfo()).isEqualTo(message);
}
@Test
public void shouldRevokeLeadership() {
given(this.mockOnGrantedEvent.getContext()).willReturn(this.mockContext);
this.leaderController.handleEvent(this.mockOnGrantedEvent);
ResponseEntity<String> responseEntity = this.leaderController.revokeLeadership();
String message = String.format("Leadership revoked for '%s'", this.host);
assertThat(responseEntity.getBody()).isEqualTo(message);
assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.OK);
verify(this.mockContext).yield();
}
@Test
public void shouldNotRevokeLeadershipIfNotLeader() {
ResponseEntity<String> responseEntity = this.leaderController.revokeLeadership();
String message = String.format("Cannot revoke leadership because '%s' is not a leader", this.host);
assertThat(responseEntity.getBody()).isEqualTo(message);
assertThat(responseEntity.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
verify(this.mockContext, times(0)).yield();
}
}

86
spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/.flattened-pom.xml Normal file
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@@ -0,0 +1,86 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<version>2.1.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>kubernetes-loadbalancer-example</artifactId>
<version>2.1.4-SNAPSHOT</version>
<packaging>pom</packaging>
<name>Spring Cloud LoadBalancer Example</name>
<description>Examples showing how to use features of Spring Cloud Kubernetes.</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example</url>
</scm>
</project>

117
spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/greeting-service/.flattened-pom.xml Normal file
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@@ -0,0 +1,117 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>kubernetes-loadbalancer-example</artifactId>
<version>2.1.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>greeting-service</artifactId>
<version>2.1.4-SNAPSHOT</version>
<name>Spring Cloud LoadBalancer :: Greeting Service</name>
<description>Spring Cloud LoadBalancer :: Greeting Service</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/greeting-service</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/greeting-service</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/greeting-service</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/greeting-service</url>
</scm>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes-fabric8-loadbalancer</artifactId>
<version>2.1.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes-fabric8</artifactId>
<version>2.1.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>3.14.9</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

99
spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/name-service/.flattened-pom.xml Normal file
View File

@@ -0,0 +1,99 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>kubernetes-loadbalancer-example</artifactId>
<version>2.1.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>name-service</artifactId>
<version>2.1.4-SNAPSHOT</version>
<name>Spring Cloud LoadBalancer :: Name Service</name>
<description>Spring Cloud LoadBalancer :: Name Service</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/name-service</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/name-service</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/name-service</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/kubernetes-loadbalancer-example/name-service</url>
</scm>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

139
spring-cloud-kubernetes-examples/kubernetes-reload-example/.flattened-pom.xml Normal file
View File

@@ -0,0 +1,139 @@
<?xml version="1.0" encoding="UTF-8"?>
<!--
~ Copyright 2013-2018 the original author or authors.
~
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~
~ https://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
~
-->
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<version>2.1.4-SNAPSHOT</version>
</parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-kubernetes-example-reload</artifactId>
<version>2.1.4-SNAPSHOT</version>
<name>Spring Cloud Kubernetes :: Examples :: Reload ConfigMap</name>
<description>Example demonstrating how to use the configuration reload feature.</description>
<url>https://cloud.spring.io/spring-cloud-kubernetes-examples/spring-cloud-kubernetes-example-reload</url>
<inceptionYear>2017</inceptionYear>
<organization>
<name>Pivotal Software, Inc.</name>
<url>https://www.spring.io</url>
</organization>
<licenses>
<license>
<name>Apache License, Version 2.0</name>
<url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
<distribution>repo</distribution>
</license>
</licenses>
<developers>
<developer>
<id>dsyer</id>
<name>Dave Syer</name>
<email>dsyer at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>sgibb</id>
<name>Spencer Gibb</name>
<email>sgibb at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>lead</role>
</roles>
</developer>
<developer>
<id>mgrzejszczak</id>
<name>Marcin Grzejszczak</name>
<email>mgrzejszczak at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>rbaxter</id>
<name>Ryan Baxter</name>
<email>rbaxter at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
<developer>
<id>omaciaszeksharma</id>
<name>Olga Maciaszek-Sharma</name>
<email>omaciaszeksharma at pivotal.io</email>
<organization>Pivotal Software, Inc.</organization>
<organizationUrl>https://www.spring.io</organizationUrl>
<roles>
<role>developer</role>
</roles>
</developer>
</developers>
<scm>
<connection>scm:git:git://github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/spring-cloud-kubernetes-example-reload</connection>
<developerConnection>scm:git:ssh://git@github.com/spring-cloud/spring-cloud-kubernetes.git/spring-cloud-kubernetes-examples/spring-cloud-kubernetes-example-reload</developerConnection>
<url>https://github.com/spring-cloud/spring-cloud-kubernetes/spring-cloud-kubernetes-examples/spring-cloud-kubernetes-example-reload</url>
</scm>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-actuator</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-actuator-autoconfigure</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.6.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-kubernetes-fabric8-config</artifactId>
<version>2.1.4-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.3.6.Final</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

52
spring-cloud-kubernetes-examples/pom.xml
View File

@@ -1,52 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!--
~ Copyright 2013-2018 the original author or authors.
~
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~
~ https://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
~
-->
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>spring-cloud-kubernetes</artifactId>
<groupId>org.springframework.cloud</groupId>
<version>3.1.0-SNAPSHOT</version>
</parent>
<artifactId>spring-cloud-kubernetes-examples</artifactId>
<packaging>pom</packaging>
<name>Spring Cloud Kubernetes :: Examples</name>
<description>Examples showing how to use features of Spring Cloud Kubernetes.
</description>
<modules>
<module>kubernetes-leader-election-example</module>
</modules>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<version>${maven-deploy-plugin.version}</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
</project>