├── .editorconfig ├── .gitignore ├── .mvn └── wrapper │ ├── maven-wrapper.jar │ └── maven-wrapper.properties ├── README.adoc ├── mvnw ├── mvnw.cmd ├── pom.xml └── src ├── main ├── fabric8 │ ├── deployment.yaml │ └── svc.yaml ├── java │ └── com │ │ └── redhat │ │ └── developers │ │ ├── GreeterController.java │ │ └── KubernetesSpringBootDemosConfigMapsDemoApplication.java └── resources │ └── application.properties └── test └── java └── com └── redhat └── developers └── KubernetesSpringBootDemosConfigMapsDemoApplicationTests.java /.editorconfig: -------------------------------------------------------------------------------- 1 | # top-most EditorConfig file 2 | root = true 3 | 4 | # Unix-style newlines with a newline ending every file 5 | [*] 6 | end_of_line = lf 7 | insert_final_newline = true 8 | charset = utf-8 9 | 10 | [*.java] 11 | indent_style = space 12 | indent_size = 4 13 | 14 | [*.{yaml,yml,json,xml,html}] 15 | indent_style = space 16 | indent_size = 2 17 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | target/ 2 | !.mvn/wrapper/maven-wrapper.jar 3 | 4 | ### STS ### 5 | .apt_generated 6 | .classpath 7 | .factorypath 8 | .project 9 | .settings 10 | .springBeans 11 | 12 | ### IntelliJ IDEA ### 13 | .idea 14 | *.iws 15 | *.iml 16 | *.ipr 17 | 18 | ### NetBeans ### 19 | nbproject/private/ 20 | build/ 21 | nbbuild/ 22 | dist/ 23 | nbdist/ 24 | .nb-gradle/ -------------------------------------------------------------------------------- /.mvn/wrapper/maven-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/redhat-developer-demos/spring-boot-configmaps-demo/869a19c8d478f8e0f02f96bdf87e9b94b251d9b6/.mvn/wrapper/maven-wrapper.jar -------------------------------------------------------------------------------- /.mvn/wrapper/maven-wrapper.properties: -------------------------------------------------------------------------------- 1 | distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.0/apache-maven-3.5.0-bin.zip 2 | -------------------------------------------------------------------------------- /README.adoc: -------------------------------------------------------------------------------- 1 | = Configuring Spring Boot Application on Kubernetes with ConfigMaps 2 | 3 | A demo Spring Boot application that demonstrates on using 4 | Kubernetes https://kubernetes.io/docs/tasks/configure-pod-container/configmap/[ConfigMaps] to configure Spring Boot application. 5 | 6 | == Setup 7 | 8 | * You might need an access to Kubernetes Cluster to play with this application. The easiest way to get local Kuberentes cluster 9 | up and running is using https://github.com/kubernetes/minikube[minikube] 10 | 11 | * Install https://docs.spring.io/spring-boot/docs/current/reference/html/getting-started-installing-spring-boot.html#getting-started-installing-the-cli[Spring Boot CLI] 12 | 13 | * Untar/Unzip Spring Boot CLI 1.5.7.RELEASE and add it your path 14 | 15 | NOTE: The rest of the document assumes you have https://github.com/kubernetes/minikube[minikube] up and running 16 | 17 | == Build and Deploy 18 | 19 | === Create project 20 | 21 | For the demo purpose we will be creating a simple Spring Boot project, 22 | 23 | [source,sh] 24 | ---- 25 | spring init --artifactId=spring-boot-configmaps-demo \ 26 | --name="Kubernetes:: Spring Boot:: Demos :: ConfigMaps Demo" \ 27 | --groupId="com.redhat.developers" \ 28 | --package-name="com.redhat.developers" \ 29 | --dependencies=web,actuator,lombok \ 30 | --extract spring-boot-configmaps-demo <1> 31 | 32 | cd spring-boot-configmaps-demo 33 | 34 | ./mvnw io.fabric8:fabric8-maven-plugin:3.5.30:setup <2> 35 | ---- 36 | <1> Creates a Spring Boot project with web and actuator dependencies 37 | <2> Adds the https://maven.fabric8.io[fabric8-maven-plugin] to the project that will help with deploying the application on Kubernetes 38 | 39 | The complete demo sources is available https://github.com/redhat-developer-demos/spring-boot-configmaps-demo[here] 40 | 41 | The directory **spring-boot-configmaps-demo** will be referred to as **$PROJECT_HOME** throughout this document. 42 | 43 | ==== Add a simple Greeting REST API 44 | 45 | [source,java] 46 | ---- 47 | package com.redhat.developers; 48 | 49 | import lombok.extern.slf4j.Slf4j; 50 | import org.springframework.web.bind.annotation.GetMapping; 51 | import org.springframework.web.bind.annotation.PathVariable; 52 | import org.springframework.web.bind.annotation.RestController; 53 | 54 | @RestController 55 | @Slf4j 56 | public class GreeterController { 57 | 58 | 59 | @GetMapping("/greet/{user}") 60 | public String greet(@PathVariable("user") String user) { 61 | String prefix = System.getenv().getOrDefault("GREETING_PREFIX", "Hi"); <1> 62 | log.info("Prefix :{} and User:{}", prefix, user); 63 | if (prefix == null) { 64 | prefix = "Hello!"; 65 | } 66 | 67 | return String.format("%s %s! Welcome to Configuring Spring Boot on Kubernetes!", prefix, user); 68 | } 69 | } 70 | 71 | ---- 72 | <1> The application looks for the prefix from an environment variable called **GREETER_PREFIX** 73 | 74 | [[configmap-as-env-vars]] 75 | === ConfigMap Properties as Environment Variables 76 | 77 | Lets create a Kubernetes https://kubernetes.io/docs/tasks/configure-pod-container/configmap/[ConfigMaps] to hold the property called `greeter.prefix`, 78 | which will then be injected to Kubernetes deployment via an environment variable called **GREETER_PREFIX** 79 | 80 | [[create-configmap]] 81 | ==== Create ConfigMap 82 | 83 | [source,sh] 84 | ---- 85 | kubectl create configmap spring-boot-configmaps-demo --from-literal=greeter.prefix="Hello" <1> 86 | 87 | kubectl get configmap spring-boot-configmaps-demo -oyaml <2> 88 | ---- 89 | <1> Creates a configmap called `spring-boot-configmaps-demo` which will have property called `greeter.prefix` with a value "Hello" 90 | <2> Displays the ConfigMap called `spring-boot-configmaps-demo` as yaml 91 | 92 | **Example output of `kubectl get configmap spring-boot-configmaps-demo -oyaml`** 93 | 94 | [source,yaml] 95 | ---- 96 | apiVersion: v1 97 | data: 98 | greeter.prefix: Hello 99 | kind: ConfigMap 100 | metadata: 101 | creationTimestamp: 2017-09-19T04:03:37Z 102 | name: spring-boot-configmaps-demo 103 | namespace: default 104 | resourceVersion: "50671" 105 | selfLink: /api/v1/namespaces/default/configmaps/spring-boot-configmaps-demo 106 | uid: 8397deb7-9cef-11e7-9b8d-080027da6995 107 | ---- 108 | 109 | ==== Kubernetes Manifests 110 | 111 | As the application is configured to use https://maven.fabric8.io[fabric8-maven-plugin], we can create Kubernetes deployment 112 | and service as fragments in `$PROJECT_HOME/src/main/fabric8`. The https://maven.fabric8.io[fabric8-maven-plugin] takes 113 | care of building the complete Kubernetes manifests by merging the contents of the fragment(s) from `$PROJECT_HOME/src/main/fabric8` 114 | during deploy. 115 | 116 | ===== Deployment 117 | Create a file called *deployment.yaml* in `$PROJECT_HOME/src/main/fabric8` with the following contents, 118 | 119 | [source,yaml] 120 | ---- 121 | spec: 122 | template: 123 | spec: 124 | containers: 125 | - env: 126 | - name: GREETING_PREFIX <1> 127 | valueFrom: 128 | configMapKeyRef: <2> 129 | name: spring-boot-configmaps-demo <3> 130 | key: greeter.prefix <4> 131 | 132 | ---- 133 | 134 | <1> Define Environment variable called **GREETING_PREFIX** 135 | <2> Defines that the value will be a ConfigMap reference 136 | <3> Name of the ConfigMap from where to look for the key/value pair, this should be same name you have used in <> 137 | <4> The property key inside the ConfigMap, whose value needs to be assigned to environment variable **GREETING_PREFIX** 138 | 139 | ===== Service 140 | 141 | To enable easy access of the application, we make the type of Kubernetes service as https://kubernetes.io/docs/concepts/services-networking/service/#type-nodeport[NodePort], 142 | create a file called **svc.yaml** in `$PROJECT_HOME/src/main/fabric8` with the following contents, 143 | 144 | [source,yaml] 145 | ---- 146 | apiVersion: v1 147 | kind: Service 148 | spec: 149 | type: NodePort <1> 150 | ---- 151 | <1> expose the service using https://kubernetes.io/docs/concepts/services-networking/service/#type-nodeport[NodePort] 152 | 153 | [[deploy-app]] 154 | ==== Deploy 155 | 156 | To deploy the application execute the command `./mvnw clean fabric8:deploy`. The application deployment status can be 157 | checked using the command `kubectl get pods -w` 158 | 159 | [[access-app]] 160 | ==== Access the Application 161 | 162 | To access and test the application execute the following command, 163 | 164 | [source,sh] 165 | ---- 166 | curl $(minikube service spring-boot-configmaps-demo --url)/greet/jerry; echo ""; 167 | ---- 168 | 169 | The above command should display a message like **Hello jerry! Welcome to Configuring Spring Boot on Kubernetes!** 170 | 171 | NOTE: `minikube service spring-boot-configmaps-demo --url` is used to get the service url and port via which we can access 172 | the application 173 | 174 | === As File Mounts 175 | 176 | In <> we saw how Kubernetes https://kubernetes.io/docs/tasks/configure-pod-container/configmap/[ConfigMaps] can 177 | be injected to the Kubernetes deployment as environment variables. In this section we will see how we can mount 178 | Spring Boot `application.yaml` using https://kubernetes.io/docs/tasks/configure-pod-container/configmap/[ConfigMaps]. 179 | 180 | 181 | [[app-properties]] 182 | ==== Add property to application.properties 183 | 184 | Add a property called `greeter.message` to the $PROJECT_HOME/src/main/resources/application.properties. The modified file 185 | is as shown below, 186 | 187 | [source] 188 | ---- 189 | greeter.message=%s %s! Spring Boot application.properties has been mounted as volume on Kubernetes! 190 | ---- 191 | 192 | [[create-configmap-file]] 193 | ==== Create ConfigMap 194 | 195 | [source,sh] 196 | ---- 197 | cd $PROJECT_HOME 198 | kubectl create configmap spring-app-config --from-file=src/main/resources/application.properties <1> 199 | ---- 200 | 201 | <1> This is similar to creating <> but instead of literal we will now put the entire file 202 | `application.properties` in a configmap called spring-app-config 203 | 204 | To see the contents of the ConfigMap, execute the command `kubectl get configmap spring-app-config -oyaml`, a sample output 205 | is shown below, 206 | 207 | [source,yaml] 208 | ---- 209 | apiVersion: v1 210 | data: 211 | application.properties: greeter.message=%s %s! Spring Boot application.properties has been mounted as volume on Kubernetes! 212 | on Kubernetes! 213 | kind: ConfigMap 214 | metadata: 215 | creationTimestamp: 2017-09-19T04:45:27Z 216 | name: spring-app-config 217 | namespace: default 218 | resourceVersion: "53471" 219 | selfLink: /api/v1/namespaces/default/configmaps/spring-app-config 220 | uid: 5bac774a-9cf5-11e7-9b8d-080027da6995 221 | ---- 222 | 223 | ==== Update GreeterController to use `greeter.message` 224 | 225 | Modify the `GreeterController` to use the `greeter.message`, the modified file looks as shown below 226 | 227 | [source,java] 228 | ---- 229 | package com.redhat.developers; 230 | 231 | import lombok.extern.slf4j.Slf4j; 232 | import org.springframework.beans.factory.annotation.Value; 233 | import org.springframework.web.bind.annotation.GetMapping; 234 | import org.springframework.web.bind.annotation.PathVariable; 235 | import org.springframework.web.bind.annotation.RestController; 236 | 237 | @RestController 238 | @Slf4j 239 | public class GreeterController { 240 | 241 | 242 | @Value("${greeter.message}") 243 | private String greeterMessageFormat; <1> 244 | 245 | @GetMapping("/greet/{user}") 246 | public String greet(@PathVariable("user") String user) { 247 | String prefix = System.getenv().getOrDefault("GREETING_PREFIX", "Hi"); 248 | log.info("Prefix :{} and User:{}", prefix, user); 249 | if (prefix == null) { 250 | prefix = "Hello!"; 251 | } 252 | 253 | return String.format(greeterMessageFormat, prefix, user); 254 | } 255 | } 256 | ---- 257 | <1> Injects the property `greeter.message` which has been defined in `application.properties` 258 | 259 | ===== Mounting `application.properties` inside Deployment 260 | 261 | Kubernetes https://kubernetes.io/docs/tasks/configure-pod-container/configmap/[ConfigMaps] can be mounted as volumes inside 262 | the deployments. 263 | 264 | Update the **$PROJECT_HOME/src/main/fabric8/deployment.yaml** with the following contents, 265 | 266 | [source,yaml] 267 | ---- 268 | spec: 269 | template: 270 | spec: 271 | containers: 272 | - env: 273 | - name: GREETING_PREFIX 274 | valueFrom: 275 | configMapKeyRef: 276 | name: spring-boot-configmaps-demo 277 | key: greeter.prefix 278 | volumeMounts: 279 | - name: application-config <1> 280 | mountPath: "/deployments/config" <2> 281 | readOnly: true 282 | volumes: 283 | - name: application-config 284 | configMap: 285 | name: spring-app-config <3> 286 | items: 287 | - key: application.properties <4> 288 | path: application.properties <5> 289 | ---- 290 | 291 | <1> Define a Volume mount and give it a logical name 292 | <2> Define mountPath, location inside container where the file will be mounted 293 | <3> The ConfigMap to be used, this name should be same as defined in <> 294 | <4> The property key from ConfigMap to be used as a content of file 295 | <5> The sub path within location defined, in this case it will be `/deployments/config/application.properties` 296 | 297 | ==== Deploy and Access the application 298 | 299 | <> and <> to see the `application.properties` loaded and used from ConfigMaps via 300 | container volumes. 301 | 302 | When you access the application you will notice the response to be 303 | **Hello jerry! Spring Boot application.properties has been mounted as volume on Kubernetes!** 304 | 305 | [TIP] 306 | ==== 307 | 308 | To check if the volume has been mounted execute the command, 309 | 310 | [source,sh] 311 | ---- 312 | kubectl exec spring-boot-configmaps-demo-3812387281-f566v -- cat /deployments/config/application.properties <1> 313 | ---- 314 | 315 | <1> Replace the pod id `spring-boot-configmaps-demo-3812387281-f566v` with pod from your local setup, the pod id is retrieved 316 | using the command `kubectl get pod` 317 | 318 | ==== 319 | 320 | === Cleanup 321 | 322 | To clean the deployments from $PROJECT_HOME execute `./mvnw fabric8:undeploy` 323 | 324 | --END-- 325 | -------------------------------------------------------------------------------- /mvnw: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | # ---------------------------------------------------------------------------- 3 | # Licensed to the Apache Software Foundation (ASF) under one 4 | # or more contributor license agreements. See the NOTICE file 5 | # distributed with this work for additional information 6 | # regarding copyright ownership. The ASF licenses this file 7 | # to you under the Apache License, Version 2.0 (the 8 | # "License"); you may not use this file except in compliance 9 | # with the License. You may obtain a copy of the License at 10 | # 11 | # http://www.apache.org/licenses/LICENSE-2.0 12 | # 13 | # Unless required by applicable law or agreed to in writing, 14 | # software distributed under the License is distributed on an 15 | # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 | # KIND, either express or implied. See the License for the 17 | # specific language governing permissions and limitations 18 | # under the License. 19 | # ---------------------------------------------------------------------------- 20 | 21 | # ---------------------------------------------------------------------------- 22 | # Maven2 Start Up Batch script 23 | # 24 | # Required ENV vars: 25 | # ------------------ 26 | # JAVA_HOME - location of a JDK home dir 27 | # 28 | # Optional ENV vars 29 | # ----------------- 30 | # M2_HOME - location of maven2's installed home dir 31 | # MAVEN_OPTS - parameters passed to the Java VM when running Maven 32 | # e.g. to debug Maven itself, use 33 | # set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 34 | # MAVEN_SKIP_RC - flag to disable loading of mavenrc files 35 | # ---------------------------------------------------------------------------- 36 | 37 | if [ -z "$MAVEN_SKIP_RC" ] ; then 38 | 39 | if [ -f /etc/mavenrc ] ; then 40 | . /etc/mavenrc 41 | fi 42 | 43 | if [ -f "$HOME/.mavenrc" ] ; then 44 | . "$HOME/.mavenrc" 45 | fi 46 | 47 | fi 48 | 49 | # OS specific support. $var _must_ be set to either true or false. 50 | cygwin=false; 51 | darwin=false; 52 | mingw=false 53 | case "`uname`" in 54 | CYGWIN*) cygwin=true ;; 55 | MINGW*) mingw=true;; 56 | Darwin*) darwin=true 57 | # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home 58 | # See https://developer.apple.com/library/mac/qa/qa1170/_index.html 59 | if [ -z "$JAVA_HOME" ]; then 60 | if [ -x "/usr/libexec/java_home" ]; then 61 | export JAVA_HOME="`/usr/libexec/java_home`" 62 | else 63 | export JAVA_HOME="/Library/Java/Home" 64 | fi 65 | fi 66 | ;; 67 | esac 68 | 69 | if [ -z "$JAVA_HOME" ] ; then 70 | if [ -r /etc/gentoo-release ] ; then 71 | JAVA_HOME=`java-config --jre-home` 72 | fi 73 | fi 74 | 75 | if [ -z "$M2_HOME" ] ; then 76 | ## resolve links - $0 may be a link to maven's home 77 | PRG="$0" 78 | 79 | # need this for relative symlinks 80 | while [ -h "$PRG" ] ; do 81 | ls=`ls -ld "$PRG"` 82 | link=`expr "$ls" : '.*-> \(.*\)$'` 83 | if expr "$link" : '/.*' > /dev/null; then 84 | PRG="$link" 85 | else 86 | PRG="`dirname "$PRG"`/$link" 87 | fi 88 | done 89 | 90 | saveddir=`pwd` 91 | 92 | M2_HOME=`dirname "$PRG"`/.. 93 | 94 | # make it fully qualified 95 | M2_HOME=`cd "$M2_HOME" && pwd` 96 | 97 | cd "$saveddir" 98 | # echo Using m2 at $M2_HOME 99 | fi 100 | 101 | # For Cygwin, ensure paths are in UNIX format before anything is touched 102 | if $cygwin ; then 103 | [ -n "$M2_HOME" ] && 104 | M2_HOME=`cygpath --unix "$M2_HOME"` 105 | [ -n "$JAVA_HOME" ] && 106 | JAVA_HOME=`cygpath --unix "$JAVA_HOME"` 107 | [ -n "$CLASSPATH" ] && 108 | CLASSPATH=`cygpath --path --unix "$CLASSPATH"` 109 | fi 110 | 111 | # For Migwn, ensure paths are in UNIX format before anything is touched 112 | if $mingw ; then 113 | [ -n "$M2_HOME" ] && 114 | M2_HOME="`(cd "$M2_HOME"; pwd)`" 115 | [ -n "$JAVA_HOME" ] && 116 | JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`" 117 | # TODO classpath? 118 | fi 119 | 120 | if [ -z "$JAVA_HOME" ]; then 121 | javaExecutable="`which javac`" 122 | if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then 123 | # readlink(1) is not available as standard on Solaris 10. 124 | readLink=`which readlink` 125 | if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then 126 | if $darwin ; then 127 | javaHome="`dirname \"$javaExecutable\"`" 128 | javaExecutable="`cd \"$javaHome\" && pwd -P`/javac" 129 | else 130 | javaExecutable="`readlink -f \"$javaExecutable\"`" 131 | fi 132 | javaHome="`dirname \"$javaExecutable\"`" 133 | javaHome=`expr "$javaHome" : '\(.*\)/bin'` 134 | JAVA_HOME="$javaHome" 135 | export JAVA_HOME 136 | fi 137 | fi 138 | fi 139 | 140 | if [ -z "$JAVACMD" ] ; then 141 | if [ -n "$JAVA_HOME" ] ; then 142 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 143 | # IBM's JDK on AIX uses strange locations for the executables 144 | JAVACMD="$JAVA_HOME/jre/sh/java" 145 | else 146 | JAVACMD="$JAVA_HOME/bin/java" 147 | fi 148 | else 149 | JAVACMD="`which java`" 150 | fi 151 | fi 152 | 153 | if [ ! -x "$JAVACMD" ] ; then 154 | echo "Error: JAVA_HOME is not defined correctly." >&2 155 | echo " We cannot execute $JAVACMD" >&2 156 | exit 1 157 | fi 158 | 159 | if [ -z "$JAVA_HOME" ] ; then 160 | echo "Warning: JAVA_HOME environment variable is not set." 161 | fi 162 | 163 | CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher 164 | 165 | # traverses directory structure from process work directory to filesystem root 166 | # first directory with .mvn subdirectory is considered project base directory 167 | find_maven_basedir() { 168 | 169 | if [ -z "$1" ] 170 | then 171 | echo "Path not specified to find_maven_basedir" 172 | return 1 173 | fi 174 | 175 | basedir="$1" 176 | wdir="$1" 177 | while [ "$wdir" != '/' ] ; do 178 | if [ -d "$wdir"/.mvn ] ; then 179 | basedir=$wdir 180 | break 181 | fi 182 | # workaround for JBEAP-8937 (on Solaris 10/Sparc) 183 | if [ -d "${wdir}" ]; then 184 | wdir=`cd "$wdir/.."; pwd` 185 | fi 186 | # end of workaround 187 | done 188 | echo "${basedir}" 189 | } 190 | 191 | # concatenates all lines of a file 192 | concat_lines() { 193 | if [ -f "$1" ]; then 194 | echo "$(tr -s '\n' ' ' < "$1")" 195 | fi 196 | } 197 | 198 | BASE_DIR=`find_maven_basedir "$(pwd)"` 199 | if [ -z "$BASE_DIR" ]; then 200 | exit 1; 201 | fi 202 | 203 | export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"} 204 | echo $MAVEN_PROJECTBASEDIR 205 | MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS" 206 | 207 | # For Cygwin, switch paths to Windows format before running java 208 | if $cygwin; then 209 | [ -n "$M2_HOME" ] && 210 | M2_HOME=`cygpath --path --windows "$M2_HOME"` 211 | [ -n "$JAVA_HOME" ] && 212 | JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"` 213 | [ -n "$CLASSPATH" ] && 214 | CLASSPATH=`cygpath --path --windows "$CLASSPATH"` 215 | [ -n "$MAVEN_PROJECTBASEDIR" ] && 216 | MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"` 217 | fi 218 | 219 | WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 220 | 221 | exec "$JAVACMD" \ 222 | $MAVEN_OPTS \ 223 | -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \ 224 | "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \ 225 | ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@" 226 | -------------------------------------------------------------------------------- /mvnw.cmd: -------------------------------------------------------------------------------- 1 | @REM ---------------------------------------------------------------------------- 2 | @REM Licensed to the Apache Software Foundation (ASF) under one 3 | @REM or more contributor license agreements. See the NOTICE file 4 | @REM distributed with this work for additional information 5 | @REM regarding copyright ownership. The ASF licenses this file 6 | @REM to you under the Apache License, Version 2.0 (the 7 | @REM "License"); you may not use this file except in compliance 8 | @REM with the License. You may obtain a copy of the License at 9 | @REM 10 | @REM http://www.apache.org/licenses/LICENSE-2.0 11 | @REM 12 | @REM Unless required by applicable law or agreed to in writing, 13 | @REM software distributed under the License is distributed on an 14 | @REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 | @REM KIND, either express or implied. See the License for the 16 | @REM specific language governing permissions and limitations 17 | @REM under the License. 18 | @REM ---------------------------------------------------------------------------- 19 | 20 | @REM ---------------------------------------------------------------------------- 21 | @REM Maven2 Start Up Batch script 22 | @REM 23 | @REM Required ENV vars: 24 | @REM JAVA_HOME - location of a JDK home dir 25 | @REM 26 | @REM Optional ENV vars 27 | @REM M2_HOME - location of maven2's installed home dir 28 | @REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands 29 | @REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending 30 | @REM MAVEN_OPTS - parameters passed to the Java VM when running Maven 31 | @REM e.g. to debug Maven itself, use 32 | @REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000 33 | @REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files 34 | @REM ---------------------------------------------------------------------------- 35 | 36 | @REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on' 37 | @echo off 38 | @REM enable echoing my setting MAVEN_BATCH_ECHO to 'on' 39 | @if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO% 40 | 41 | @REM set %HOME% to equivalent of $HOME 42 | if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%") 43 | 44 | @REM Execute a user defined script before this one 45 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre 46 | @REM check for pre script, once with legacy .bat ending and once with .cmd ending 47 | if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat" 48 | if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd" 49 | :skipRcPre 50 | 51 | @setlocal 52 | 53 | set ERROR_CODE=0 54 | 55 | @REM To isolate internal variables from possible post scripts, we use another setlocal 56 | @setlocal 57 | 58 | @REM ==== START VALIDATION ==== 59 | if not "%JAVA_HOME%" == "" goto OkJHome 60 | 61 | echo. 62 | echo Error: JAVA_HOME not found in your environment. >&2 63 | echo Please set the JAVA_HOME variable in your environment to match the >&2 64 | echo location of your Java installation. >&2 65 | echo. 66 | goto error 67 | 68 | :OkJHome 69 | if exist "%JAVA_HOME%\bin\java.exe" goto init 70 | 71 | echo. 72 | echo Error: JAVA_HOME is set to an invalid directory. >&2 73 | echo JAVA_HOME = "%JAVA_HOME%" >&2 74 | echo Please set the JAVA_HOME variable in your environment to match the >&2 75 | echo location of your Java installation. >&2 76 | echo. 77 | goto error 78 | 79 | @REM ==== END VALIDATION ==== 80 | 81 | :init 82 | 83 | @REM Find the project base dir, i.e. the directory that contains the folder ".mvn". 84 | @REM Fallback to current working directory if not found. 85 | 86 | set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR% 87 | IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir 88 | 89 | set EXEC_DIR=%CD% 90 | set WDIR=%EXEC_DIR% 91 | :findBaseDir 92 | IF EXIST "%WDIR%"\.mvn goto baseDirFound 93 | cd .. 94 | IF "%WDIR%"=="%CD%" goto baseDirNotFound 95 | set WDIR=%CD% 96 | goto findBaseDir 97 | 98 | :baseDirFound 99 | set MAVEN_PROJECTBASEDIR=%WDIR% 100 | cd "%EXEC_DIR%" 101 | goto endDetectBaseDir 102 | 103 | :baseDirNotFound 104 | set MAVEN_PROJECTBASEDIR=%EXEC_DIR% 105 | cd "%EXEC_DIR%" 106 | 107 | :endDetectBaseDir 108 | 109 | IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig 110 | 111 | @setlocal EnableExtensions EnableDelayedExpansion 112 | for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a 113 | @endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS% 114 | 115 | :endReadAdditionalConfig 116 | 117 | SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe" 118 | 119 | set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar" 120 | set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain 121 | 122 | %MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %* 123 | if ERRORLEVEL 1 goto error 124 | goto end 125 | 126 | :error 127 | set ERROR_CODE=1 128 | 129 | :end 130 | @endlocal & set ERROR_CODE=%ERROR_CODE% 131 | 132 | if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost 133 | @REM check for post script, once with legacy .bat ending and once with .cmd ending 134 | if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat" 135 | if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd" 136 | :skipRcPost 137 | 138 | @REM pause the script if MAVEN_BATCH_PAUSE is set to 'on' 139 | if "%MAVEN_BATCH_PAUSE%" == "on" pause 140 | 141 | if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE% 142 | 143 | exit /B %ERROR_CODE% 144 | -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 4.0.0 3 | 4 | com.redhat.developers 5 | spring-boot-configmaps-demo 6 | 0.0.1-SNAPSHOT 7 | jar 8 | 9 | Kubernetes:: Spring Boot:: Demos :: ConfigMaps Demo 10 | Demo project for Spring Boot 11 | 12 | 13 | org.springframework.boot 14 | spring-boot-starter-parent 15 | 1.5.7.RELEASE 16 | 17 | 18 | 19 | 20 | UTF-8 21 | UTF-8 22 | 1.8 23 | 24 | 25 | 26 | 27 | org.springframework.boot 28 | spring-boot-starter-actuator 29 | 30 | 31 | org.springframework.boot 32 | spring-boot-starter-web 33 | 34 | 35 | 36 | org.projectlombok 37 | lombok 38 | true 39 | 40 | 41 | org.springframework.boot 42 | spring-boot-starter-test 43 | test 44 | 45 | 46 | 47 | 48 | 49 | 50 | org.springframework.boot 51 | spring-boot-maven-plugin 52 | 53 | 54 | io.fabric8 55 | fabric8-maven-plugin 56 | 3.5.30 57 | 58 | 59 | fmp 60 | 61 | resource 62 | helm 63 | build 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | -------------------------------------------------------------------------------- /src/main/fabric8/deployment.yaml: -------------------------------------------------------------------------------- 1 | spec: 2 | template: 3 | spec: 4 | containers: 5 | - env: 6 | - name: GREETING_PREFIX 7 | valueFrom: 8 | configMapKeyRef: 9 | name: spring-boot-configmaps-demo 10 | key: greeter.prefix 11 | volumeMounts: 12 | - name: application-config 13 | mountPath: "/deployments/config" 14 | readOnly: true 15 | volumes: 16 | - name: application-config 17 | configMap: 18 | name: spring-app-config 19 | items: 20 | - key: application.properties 21 | path: application.properties -------------------------------------------------------------------------------- /src/main/fabric8/svc.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: Service 3 | spec: 4 | type: NodePort -------------------------------------------------------------------------------- /src/main/java/com/redhat/developers/GreeterController.java: -------------------------------------------------------------------------------- 1 | package com.redhat.developers; 2 | 3 | import lombok.extern.slf4j.Slf4j; 4 | import org.springframework.beans.factory.annotation.Value; 5 | import org.springframework.web.bind.annotation.GetMapping; 6 | import org.springframework.web.bind.annotation.PathVariable; 7 | import org.springframework.web.bind.annotation.RestController; 8 | 9 | @RestController 10 | @Slf4j 11 | public class GreeterController { 12 | 13 | @Value("${greeter.message}") 14 | private String greeterMessageFormat; 15 | 16 | @GetMapping("/greet/{user}") 17 | public String greet(@PathVariable("user") String user) { 18 | String prefix = System.getenv().getOrDefault("GREETING_PREFIX", "Hi"); 19 | log.info("Prefix :{} and User:{}", prefix, user); 20 | if (prefix == null) { 21 | prefix = "Hello!"; 22 | } 23 | 24 | return String.format(greeterMessageFormat, prefix, user); 25 | } 26 | } -------------------------------------------------------------------------------- /src/main/java/com/redhat/developers/KubernetesSpringBootDemosConfigMapsDemoApplication.java: -------------------------------------------------------------------------------- 1 | package com.redhat.developers; 2 | 3 | import org.springframework.boot.SpringApplication; 4 | import org.springframework.boot.autoconfigure.SpringBootApplication; 5 | 6 | @SpringBootApplication 7 | public class KubernetesSpringBootDemosConfigMapsDemoApplication { 8 | 9 | public static void main(String[] args) { 10 | SpringApplication.run(KubernetesSpringBootDemosConfigMapsDemoApplication.class, args); 11 | } 12 | } 13 | -------------------------------------------------------------------------------- /src/main/resources/application.properties: -------------------------------------------------------------------------------- 1 | greeter.message=%s %s! Spring Boot application.properties has been mounted as volume on Kubernetes! -------------------------------------------------------------------------------- /src/test/java/com/redhat/developers/KubernetesSpringBootDemosConfigMapsDemoApplicationTests.java: -------------------------------------------------------------------------------- 1 | package com.redhat.developers; 2 | 3 | import org.junit.Test; 4 | import org.junit.runner.RunWith; 5 | import org.springframework.boot.test.context.SpringBootTest; 6 | import org.springframework.test.context.junit4.SpringRunner; 7 | 8 | @RunWith(SpringRunner.class) 9 | @SpringBootTest 10 | public class KubernetesSpringBootDemosConfigMapsDemoApplicationTests { 11 | 12 | @Test 13 | public void contextLoads() { 14 | } 15 | 16 | } 17 | --------------------------------------------------------------------------------