k8s/base/secrets/secrets-template.yaml aktualisiert

Creating microservice and project structure and setting up gradle basics

.gitignore

@@ -23,4 +23,3 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 replay_pid*
-

.gradle/buildOutputCleanup/cache.properties

@@ -0,0 +1,2 @@
+#Tue Dec 09 20:32:30 CET 2025
+gradle.version=7.5.1

build.gradle

@@ -0,0 +1,41 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.5.8' apply false
+    id 'io.spring.dependency-management' version '1.1.7' apply false
+}
+
+allprojects {
+    group 'me.lenajenichen'
+    version '0.0.1-SNAPSHOT'
+
+    repositories {
+        mavenCentral()
+    }
+}
+
+subprojects {
+
+    apply plugin: 'java'
+
+    // Only the actual service applications (under :services:...) are Spring Boot apps.
+    // Aggregator/helper projects like :services and :test should not apply Spring Boot.
+    if (project.path.startsWith(':services:')) {
+        apply plugin: 'org.springframework.boot'
+        apply plugin: 'io.spring.dependency-management'
+
+        dependencies {
+            implementation 'org.springframework.boot:spring-boot-starter'
+            implementation 'org.springframework.boot:spring-boot-starter-web'
+            // Ensure R2DBC SPI is on the classpath to satisfy Boot's autoconfiguration checks
+            implementation 'io.r2dbc:r2dbc-spi'
+
+            testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+            testImplementation 'org.springframework.boot:spring-boot-starter-test'
+            testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+        }
+    }
+
+    tasks.withType(Test).configureEach {
+        useJUnitPlatform()
+    }
+}

build/tmp/jar/MANIFEST.MF

@@ -0,0 +1,2 @@
+Manifest-Version: 1.0
+

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,240 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,91 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

k8s/base/configmaps/application-config.yaml

@@ -0,0 +1,28 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: application-config
+  namespace: urlshortener
+  labels:
+    app: urlshortener
+data:
+  # Spring Boot Actuator configuration
+  management.endpoints.web.exposure.include: "health,info,metrics,prometheus"
+  management.endpoint.health.probes.enabled: "true"
+  management.health.livenessState.enabled: "true"
+  management.health.readinessState.enabled: "true"
+  
+  # Logging configuration
+  logging.level.root: "INFO"
+  logging.level.me.lenajenichen: "DEBUG"
+  logging.pattern.console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"
+  
+  # Application common settings
+  spring.application.name: "urlshortener"
+  
+  # Server configuration
+  server.error.include-message: "always"
+  server.error.include-binding-errors: "always"
+  server.error.include-stacktrace: "on_param"
+  server.error.include-exception: "false"
+

k8s/base/configmaps/database-config.yaml

@@ -0,0 +1,24 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: database-config
+  namespace: urlshortener
+  labels:
+    app: urlshortener
+data:
+  # PostgreSQL connection settings
+  # These will be used by services that need database access
+  # Note: Password should be set via secret: urlshortener-secrets (database-password key)
+  spring.r2dbc.url: "r2dbc:postgresql://postgres:5432/urlshortener"
+  spring.r2dbc.username: "urlshortener"
+  # Password is loaded from secret: urlshortener-secrets.database-password
+  
+  # Connection pool settings
+  spring.r2dbc.pool.initial-size: "5"
+  spring.r2dbc.pool.max-size: "20"
+  spring.r2dbc.pool.max-idle-time: "30m"
+  
+  # Database migration (if using Flyway or Liquibase)
+  spring.flyway.enabled: "true"
+  spring.flyway.baseline-on-migrate: "true"
+

k8s/base/configmaps/service-config.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: service-config
+  namespace: urlshortener
+  labels:
+    app: urlshortener
+data:
+  # Service discovery - internal service URLs
+  shortener.service.url: "http://shortener-service:8083"
+  auth.service.url: "http://auth-service:8080"
+  analytics.service.url: "http://analytics-service:8080"
+  redirect.service.url: "http://redirect-service:8080"
+  
+  # External service URLs (if needed)
+  shortener.service.external.url: "https://api.urlshortener.example.com/api/shortener"
+  redirect.service.external.url: "https://short.urlshortener.example.com"
+

k8s/base/deployments/analytics-service-deployment.yaml

@@ -0,0 +1,79 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: analytics-service
+  namespace: urlshortener
+  labels:
+    app: analytics-service
+    component: backend
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: analytics-service
+  template:
+    metadata:
+      labels:
+        app: analytics-service
+        component: backend
+    spec:
+      containers:
+      - name: analytics-service
+        image: analytics-service:latest
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 8080
+          name: http
+          protocol: TCP
+        env:
+        - name: SERVER_PORT
+          value: "8080"
+        - name: SPRING_APPLICATION_NAME
+          value: analytics-service
+        - name: SPRING_R2DBC_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: urlshortener-secrets
+              key: database-password
+        envFrom:
+        - configMapRef:
+            name: application-config
+        - configMapRef:
+            name: database-config
+        - configMapRef:
+            name: service-config
+        - secretRef:
+            name: urlshortener-secrets
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "100m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"
+        livenessProbe:
+          httpGet:
+            path: /actuator/health/liveness
+            port: 8080
+          initialDelaySeconds: 60
+          periodSeconds: 10
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /actuator/health/readiness
+            port: 8080
+          initialDelaySeconds: 30
+          periodSeconds: 5
+          timeoutSeconds: 3
+          failureThreshold: 3
+        startupProbe:
+          httpGet:
+            path: /actuator/health
+            port: 8080
+          initialDelaySeconds: 0
+          periodSeconds: 10
+          timeoutSeconds: 3
+          failureThreshold: 30
+      restartPolicy: Always
+

k8s/base/deployments/auth-service-deployment.yaml

@@ -0,0 +1,79 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: auth-service
+  namespace: urlshortener
+  labels:
+    app: auth-service
+    component: backend
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: auth-service
+  template:
+    metadata:
+      labels:
+        app: auth-service
+        component: backend
+    spec:
+      containers:
+      - name: auth-service
+        image: auth-service:latest
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 8080
+          name: http
+          protocol: TCP
+        env:
+        - name: SERVER_PORT
+          value: "8080"
+        - name: SPRING_APPLICATION_NAME
+          value: auth-service
+        - name: SPRING_R2DBC_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: urlshortener-secrets
+              key: database-password
+        envFrom:
+        - configMapRef:
+            name: application-config
+        - configMapRef:
+            name: database-config
+        - configMapRef:
+            name: service-config
+        - secretRef:
+            name: urlshortener-secrets
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "100m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"
+        livenessProbe:
+          httpGet:
+            path: /actuator/health/liveness
+            port: 8080
+          initialDelaySeconds: 60
+          periodSeconds: 10
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /actuator/health/readiness
+            port: 8080
+          initialDelaySeconds: 30
+          periodSeconds: 5
+          timeoutSeconds: 3
+          failureThreshold: 3
+        startupProbe:
+          httpGet:
+            path: /actuator/health
+            port: 8080
+          initialDelaySeconds: 0
+          periodSeconds: 10
+          timeoutSeconds: 3
+          failureThreshold: 30
+      restartPolicy: Always
+

k8s/base/deployments/redirect-service-deployment.yaml

@@ -0,0 +1,79 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redirect-service
+  namespace: urlshortener
+  labels:
+    app: redirect-service
+    component: backend
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: redirect-service
+  template:
+    metadata:
+      labels:
+        app: redirect-service
+        component: backend
+    spec:
+      containers:
+      - name: redirect-service
+        image: redirect-service:latest
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 8080
+          name: http
+          protocol: TCP
+        env:
+        - name: SERVER_PORT
+          value: "8080"
+        - name: SPRING_APPLICATION_NAME
+          value: redirect-service
+        - name: SPRING_R2DBC_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: urlshortener-secrets
+              key: database-password
+        envFrom:
+        - configMapRef:
+            name: application-config
+        - configMapRef:
+            name: database-config
+        - configMapRef:
+            name: service-config
+        - secretRef:
+            name: urlshortener-secrets
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "100m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"
+        livenessProbe:
+          httpGet:
+            path: /actuator/health/liveness
+            port: 8080
+          initialDelaySeconds: 60
+          periodSeconds: 10
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /actuator/health/readiness
+            port: 8080
+          initialDelaySeconds: 30
+          periodSeconds: 5
+          timeoutSeconds: 3
+          failureThreshold: 3
+        startupProbe:
+          httpGet:
+            path: /actuator/health
+            port: 8080
+          initialDelaySeconds: 0
+          periodSeconds: 10
+          timeoutSeconds: 3
+          failureThreshold: 30
+      restartPolicy: Always
+

k8s/base/deployments/shortener-service-deployment.yaml

@@ -0,0 +1,79 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: shortener-service
+  namespace: urlshortener
+  labels:
+    app: shortener-service
+    component: backend
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: shortener-service
+  template:
+    metadata:
+      labels:
+        app: shortener-service
+        component: backend
+    spec:
+      containers:
+      - name: shortener-service
+        image: shortener-service:latest
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 8083
+          name: http
+          protocol: TCP
+        env:
+        - name: SERVER_PORT
+          value: "8083"
+        - name: SPRING_APPLICATION_NAME
+          value: shortener-service
+        - name: SPRING_R2DBC_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: urlshortener-secrets
+              key: database-password
+        envFrom:
+        - configMapRef:
+            name: application-config
+        - configMapRef:
+            name: database-config
+        - configMapRef:
+            name: service-config
+        - secretRef:
+            name: urlshortener-secrets
+        resources:
+          requests:
+            memory: "256Mi"
+            cpu: "100m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"
+        livenessProbe:
+          httpGet:
+            path: /actuator/health/liveness
+            port: 8083
+          initialDelaySeconds: 60
+          periodSeconds: 10
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /actuator/health/readiness
+            port: 8083
+          initialDelaySeconds: 30
+          periodSeconds: 5
+          timeoutSeconds: 3
+          failureThreshold: 3
+        startupProbe:
+          httpGet:
+            path: /actuator/health
+            port: 8083
+          initialDelaySeconds: 0
+          periodSeconds: 10
+          timeoutSeconds: 3
+          failureThreshold: 30
+      restartPolicy: Always
+

k8s/base/ingress/ingress.yaml

@@ -0,0 +1,54 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: urlshortener-ingress
+  namespace: urlshortener
+  annotations:
+    nginx.ingress.kubernetes.io/rewrite-target: /
+    nginx.ingress.kubernetes.io/ssl-redirect: "true"
+    cert-manager.io/cluster-issuer: "letsencrypt-prod"
+spec:
+  ingressClassName: nginx
+  tls:
+  - hosts:
+    - api.urlshortener.example.com
+    - short.urlshortener.example.com
+    secretName: urlshortener-tls
+  rules:
+  # API routes for shortener and auth services
+  - host: api.urlshortener.example.com
+    http:
+      paths:
+      - path: /api/shortener
+        pathType: Prefix
+        backend:
+          service:
+            name: shortener-service
+            port:
+              number: 8083
+      - path: /api/auth
+        pathType: Prefix
+        backend:
+          service:
+            name: auth-service
+            port:
+              number: 8080
+      - path: /api/analytics
+        pathType: Prefix
+        backend:
+          service:
+            name: analytics-service
+            port:
+              number: 8080
+  # Redirect service - handles short URL redirects
+  - host: short.urlshortener.example.com
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: redirect-service
+            port:
+              number: 8080
+

k8s/base/namespace.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: urlshortener
+  labels:
+    name: urlshortener
+    environment: production
+

k8s/base/secrets/secrets-template.yaml

@@ -0,0 +1,16 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: urlshortener-secrets
+  namespace: urlshortener
+  labels:
+    app: urlshortener
+type: Opaque
+stringData:
+  # Database credentials
+  # IMPORTANT: Replace these with actual values or use a secret management system
+  database-password: "CHANGE_ME"
+  
+  # JWT secrets for authentication
+  jwt.secret: "CHANGE_ME_JWT_SECRET_KEY_MIN_32_CHARS"
+  jwt.expiration: "86400000" 

k8s/base/services/analytics-service-service.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: analytics-service
+  namespace: urlshortener
+  labels:
+    app: analytics-service
+    component: backend
+spec:
+  type: ClusterIP
+  ports:
+  - port: 8080
+    targetPort: 8080
+    protocol: TCP
+    name: http
+  selector:
+    app: analytics-service
+  sessionAffinity: None
+

k8s/base/services/auth-service-service.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: auth-service
+  namespace: urlshortener
+  labels:
+    app: auth-service
+    component: backend
+spec:
+  type: ClusterIP
+  ports:
+  - port: 8080
+    targetPort: 8080
+    protocol: TCP
+    name: http
+  selector:
+    app: auth-service
+  sessionAffinity: None
+

k8s/base/services/redirect-service-service.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: redirect-service
+  namespace: urlshortener
+  labels:
+    app: redirect-service
+    component: backend
+spec:
+  type: ClusterIP
+  ports:
+  - port: 8080
+    targetPort: 8080
+    protocol: TCP
+    name: http
+  selector:
+    app: redirect-service
+  sessionAffinity: None
+

k8s/base/services/shortener-service-service.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: shortener-service
+  namespace: urlshortener
+  labels:
+    app: shortener-service
+    component: backend
+spec:
+  type: ClusterIP
+  ports:
+  - port: 8083
+    targetPort: 8083
+    protocol: TCP
+    name: http
+  selector:
+    app: shortener-service
+  sessionAffinity: None
+

services/analytics-service/Dockerfile

@@ -0,0 +1,53 @@
+# Build stage
+FROM gradle:8.10.1-jdk21 AS build
+
+WORKDIR /app
+
+# Copy Gradle wrapper and build files for dependency caching
+COPY gradle/ gradle/
+COPY gradlew gradlew.bat ./
+COPY build.gradle settings.gradle ./
+
+# Copy source code
+COPY services/analytics-service/build.gradle ./services/analytics-service/
+COPY services/analytics-service/src ./services/analytics-service/src/
+
+# Build the application
+RUN ./gradlew :services:analytics-service:bootJar --no-daemon
+
+# Runtime stage
+FROM eclipse-temurin:21-jre-jammy AS runtime
+
+# Install curl for health checks (minimal size impact)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN groupadd -r spring && useradd -r -g spring spring
+
+# Set working directory
+WORKDIR /app
+
+# Copy the JAR from build stage
+COPY --from=build /app/services/analytics-service/build/libs/*.jar app.jar
+
+# Change ownership to non-root user
+RUN chown spring:spring app.jar
+
+# Switch to non-root user
+USER spring:spring
+
+# Expose application port (default Spring Boot port, can be overridden via env)
+EXPOSE 8080
+
+# Health check for Kubernetes (can be overridden by K8s probes)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD curl -f http://localhost:${SERVER_PORT:-8080}/actuator/health || exit 1
+
+# Optimize JVM for containers
+ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0 -XX:+UseG1GC -XX:+UseStringDeduplication"
+
+# Run the application
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]
+

services/analytics-service/build.gradle

@@ -0,0 +1,23 @@
+plugins {
+    id 'java'
+}
+
+group 'me.lenajenichen'
+version '0.0.1-SNAPSHOT'
+
+springBoot {
+    mainClass = 'AnalyticsServiceApplication'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+}
+
+test {
+    useJUnitPlatform()
+}

services/analytics-service/src/main/java/AnalyticsServiceApplication.java

@@ -0,0 +1,13 @@
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class AnalyticsServiceApplication {
+
+    public static void main(String[] args) {
+
+        SpringApplication.run(AnalyticsServiceApplication.class, args);
+
+    }
+
+}

services/auth-service/Dockerfile

@@ -0,0 +1,53 @@
+# Build stage
+FROM gradle:8.10.1-jdk21 AS build
+
+WORKDIR /app
+
+# Copy Gradle wrapper and build files for dependency caching
+COPY gradle/ gradle/
+COPY gradlew gradlew.bat ./
+COPY build.gradle settings.gradle ./
+
+# Copy source code
+COPY services/auth-service/build.gradle ./services/auth-service/
+COPY services/auth-service/src ./services/auth-service/src/
+
+# Build the application
+RUN ./gradlew :services:auth-service:bootJar --no-daemon
+
+# Runtime stage
+FROM eclipse-temurin:21-jre-jammy AS runtime
+
+# Install curl for health checks (minimal size impact)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN groupadd -r spring && useradd -r -g spring spring
+
+# Set working directory
+WORKDIR /app
+
+# Copy the JAR from build stage
+COPY --from=build /app/services/auth-service/build/libs/*.jar app.jar
+
+# Change ownership to non-root user
+RUN chown spring:spring app.jar
+
+# Switch to non-root user
+USER spring:spring
+
+# Expose application port (default Spring Boot port, can be overridden via env)
+EXPOSE 8080
+
+# Health check for Kubernetes (can be overridden by K8s probes)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD curl -f http://localhost:${SERVER_PORT:-8080}/actuator/health || exit 1
+
+# Optimize JVM for containers
+ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0 -XX:+UseG1GC -XX:+UseStringDeduplication"
+
+# Run the application
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]
+

services/auth-service/build.gradle

@@ -0,0 +1,23 @@
+plugins {
+    id 'java'
+}
+
+group 'me.lenajenichen'
+version '0.0.1-SNAPSHOT'
+
+springBoot {
+    mainClass = 'AuthServiceApplication'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+}
+
+test {
+    useJUnitPlatform()
+}

services/auth-service/src/main/java/AuthServiceApplication.java

@@ -0,0 +1,13 @@
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class AuthServiceApplication {
+
+    public static void main(String[] args) {
+
+        SpringApplication.run(AuthServiceApplication.class, args);
+
+    }
+
+}

services/redirect-service/Dockerfile

@@ -0,0 +1,53 @@
+# Build stage
+FROM gradle:8.10.1-jdk21 AS build
+
+WORKDIR /app
+
+# Copy Gradle wrapper and build files for dependency caching
+COPY gradle/ gradle/
+COPY gradlew gradlew.bat ./
+COPY build.gradle settings.gradle ./
+
+# Copy source code
+COPY services/redirect-service/build.gradle ./services/redirect-service/
+COPY services/redirect-service/src ./services/redirect-service/src/
+
+# Build the application
+RUN ./gradlew :services:redirect-service:bootJar --no-daemon
+
+# Runtime stage
+FROM eclipse-temurin:21-jre-jammy AS runtime
+
+# Install curl for health checks (minimal size impact)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN groupadd -r spring && useradd -r -g spring spring
+
+# Set working directory
+WORKDIR /app
+
+# Copy the JAR from build stage
+COPY --from=build /app/services/redirect-service/build/libs/*.jar app.jar
+
+# Change ownership to non-root user
+RUN chown spring:spring app.jar
+
+# Switch to non-root user
+USER spring:spring
+
+# Expose application port (default Spring Boot port, can be overridden via env)
+EXPOSE 8080
+
+# Health check for Kubernetes (can be overridden by K8s probes)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD curl -f http://localhost:${SERVER_PORT:-8080}/actuator/health || exit 1
+
+# Optimize JVM for containers
+ENV JAVA_OPTS="-XX:+UseContainerSupport -XX:MaxRAMPercentage=75.0 -XX:+UseG1GC -XX:+UseStringDeduplication"
+
+# Run the application
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]
+

services/redirect-service/build.gradle

@@ -0,0 +1,23 @@
+plugins {
+    id 'java'
+}
+
+group 'me.lenajenichen'
+version '0.0.1-SNAPSHOT'
+
+springBoot {
+    mainClass = 'RedirectServiceApplication'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+}
+
+test {
+    useJUnitPlatform()
+}

services/redirect-service/src/main/java/RedirectServiceApplication.java

@@ -0,0 +1,13 @@
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class RedirectServiceApplication {
+
+    public static void main(String[] args) {
+
+        SpringApplication.run(RedirectServiceApplication.class, args);
+
+    }
+
+}

services/shortener-service/Dockerfile

@@ -0,0 +1,54 @@
+# Build stage
+FROM gradle:8.10.1-jdk21 AS build
+
+WORKDIR /app
+
+# Copy Gradle wrapper and build files for dependency caching
+COPY gradle/ gradle/
+COPY gradlew gradlew.bat ./
+COPY build.gradle settings.gradle ./
+
+# Copy source code
+COPY services/shortener-service/build.gradle ./services/shortener-service/
+COPY services/shortener-service/src ./services/shortener-service/src/
+
+# Build the application
+RUN chmod +x gradlew
+RUN ./gradlew :services:shortener-service:bootJar --no-daemon
+
+# Runtime stage
+FROM eclipse-temurin:21-jre-jammy AS runtime
+
+# Install curl for health checks (minimal size impact)
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN groupadd -r spring && useradd -r -g spring spring
+
+# Set working directory
+WORKDIR /app
+
+# Copy the JAR from build stage
+COPY --from=build /app/services/shortener-service/build/libs/*.jar app.jar
+
+# Change ownership to non-root user
+RUN chown spring:spring app.jar
+
+# Switch to non-root user
+USER spring:spring
+
+# Expose application port
+EXPOSE 8080
+
+# Health check for Kubernetes (can be overridden by K8s probes)
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD curl -f http://localhost:8080/actuator/health || exit 1
+
+# Optimize JVM for containers
+ENV JAVA_OPTS="-XX:MaxRAMPercentage=75.0 -XX:+UseG1GC"
+
+# Run the application
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]
+

services/shortener-service/build.gradle

@@ -0,0 +1,23 @@
+plugins {
+    id 'java'
+}
+
+group 'me.lenajenichen'
+version '0.0.1-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+springBoot {
+    mainClass = 'shortener.ShortenerServiceApplication'
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+}
+
+test {
+    useJUnitPlatform()
+}

services/shortener-service/src/main/java/api/HealthController.java

@@ -0,0 +1,15 @@
+package api;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/health")
+public class HealthController {
+
+    @GetMapping
+    public String health() {
+        return "OK";
+    }
+}

services/shortener-service/src/main/java/shortener/ShortenerServiceApplication.java

@@ -0,0 +1,15 @@
+package shortener;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@ComponentScan(basePackages = {"shortener", "api"})
+public class ShortenerServiceApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ShortenerServiceApplication.class, args);
+    }
+
+}

services/shortener-service/src/main/resources/application.yaml

@@ -0,0 +1,6 @@
+spring:
+  application:
+    name: shortener-service
+
+server:
+  port: 8083

settings.gradle

@@ -0,0 +1,15 @@
+rootProject.name = 'URLShortener'
+include 'test'
+include 'services'
+
+include 'services:analytics-service'
+findProject(':services:analytics-service')?.name = 'analytics-service'
+
+include 'services:auth-service'
+findProject(':services:auth-service')?.name = 'auth-service'
+
+include 'services:redirect-service'
+findProject(':services:redirect-service')?.name = 'redirect-service'
+
+include 'services:shortener-service'
+findProject(':services:shortener-service')?.name = 'shortener-service'