Support Kubernetes RollingUpdate configuration

Fix quarkusio#34047

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/KubernetesConfig.java

@@ -13,6 +13,7 @@
 
 import io.dekorate.kubernetes.annotation.ImagePullPolicy;
 import io.dekorate.kubernetes.annotation.ServiceType;
+import io.dekorate.kubernetes.config.DeploymentStrategy;
 import io.quarkus.deployment.Capabilities;
 import io.quarkus.deployment.Capability;
 import io.quarkus.kubernetes.spi.DeployStrategy;
@@ -128,6 +129,20 @@ public enum DeploymentResourceKind {
     @ConfigItem(defaultValue = "1")
     Integer replicas;
 
+    /**
+     * Specifies the deployment strategy.
+     */
+    @ConfigItem(defaultValue = "None")
+    DeploymentStrategy strategy;
+
+    /**
+     * Specifies rolling update configuration.
+     * The configuration is applied when DeploymentStrategy == RollingUpdate, or
+     * when explicit configuration has been provided. In the later case RollingUpdate is assumed.
+     */
+    @ConfigItem
+    RollingUpdateConfig rollingUpdate;
+
     /**
      * The type of service that will be generated for the application
      */

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/RollingUpdateConfig.java

@@ -0,0 +1,19 @@
+package io.quarkus.kubernetes.deployment;
+
+import io.quarkus.runtime.annotations.ConfigGroup;
+import io.quarkus.runtime.annotations.ConfigItem;
+
+@ConfigGroup
+public class RollingUpdateConfig {
+    /**
+     * Specifies the maximum number of Pods that can be unavailable during the update process.
+     */
+    @ConfigItem(defaultValue = "25%")
+    String maxUnavailable;
+
+    /**
+     * Specifies the maximum number of Pods that can be created over the desired number of Pods.
+     */
+    @ConfigItem(defaultValue = "25%")
+    String maxSurge;
+}

extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/VanillaKubernetesProcessor.java

@@ -20,15 +20,18 @@
 import java.util.stream.Stream;
 
 import io.dekorate.kubernetes.annotation.ServiceType;
+import io.dekorate.kubernetes.config.DeploymentStrategy;
 import io.dekorate.kubernetes.config.EnvBuilder;
 import io.dekorate.kubernetes.config.IngressBuilder;
 import io.dekorate.kubernetes.config.IngressRuleBuilder;
 import io.dekorate.kubernetes.config.Port;
+import io.dekorate.kubernetes.config.RollingUpdateBuilder;
 import io.dekorate.kubernetes.decorator.AddAnnotationDecorator;
 import io.dekorate.kubernetes.decorator.AddEnvVarDecorator;
 import io.dekorate.kubernetes.decorator.AddIngressRuleDecorator;
 import io.dekorate.kubernetes.decorator.AddIngressTlsDecorator;
 import io.dekorate.kubernetes.decorator.ApplicationContainerDecorator;
+import io.dekorate.kubernetes.decorator.ApplyDeploymentStrategyDecorator;
 import io.dekorate.kubernetes.decorator.ApplyImagePullPolicyDecorator;
 import io.dekorate.kubernetes.decorator.ApplyReplicasToDeploymentDecorator;
 import io.dekorate.kubernetes.decorator.ApplyReplicasToStatefulSetDecorator;
@@ -287,6 +290,15 @@ public List<DecoratorBuildItem> createDecorators(ApplicationInfoBuildItem applic
             result.add(new DecoratorBuildItem(KUBERNETES, new RemovePortFromServiceDecorator(name, MANAGEMENT_PORT_NAME)));
         }
 
+        // Handle deployment strategy
+        if (config.strategy != DeploymentStrategy.None) {
+            result.add(new DecoratorBuildItem(KUBERNETES,
+                    new ApplyDeploymentStrategyDecorator(name, config.strategy, new RollingUpdateBuilder()
+                            .withMaxSurge(config.rollingUpdate.maxSurge)
+                            .withMaxUnavailable(config.rollingUpdate.maxUnavailable)
+                            .build())));
+        }
+
         return result;
     }
 

integration-tests/kubernetes/quarkus-standard-way/src/test/java/io/quarkus/it/kubernetes/KubernetesWithDefaultsTest.java

@@ -50,6 +50,7 @@ public void assertGeneratedResources() throws IOException {
                             });
                         });
                     });
+                    assertThat(deploymentSpec.getStrategy()).isNull();
                 });
             });
         });

integration-tests/kubernetes/quarkus-standard-way/src/test/java/io/quarkus/it/kubernetes/KubernetesWithStrategyRollingUpdateTest.java

@@ -0,0 +1,63 @@
+
+package io.quarkus.it.kubernetes;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.fabric8.kubernetes.api.model.HasMetadata;
+import io.fabric8.kubernetes.api.model.apps.Deployment;
+import io.quarkus.builder.Version;
+import io.quarkus.maven.dependency.Dependency;
+import io.quarkus.test.ProdBuildResults;
+import io.quarkus.test.ProdModeTestResults;
+import io.quarkus.test.QuarkusProdModeTest;
+
+public class KubernetesWithStrategyRollingUpdateTest {
+
+    private static final String APP_NAME = "kubernetes-with-strategy-rolling-update";
+    private static final String STRATEGY_TYPE = "RollingUpdate";
+    private static final String MAX_UNAVAILABLE = "35%";
+    private static final String MAX_SURGE = "39%";
+
+    @RegisterExtension
+    static final QuarkusProdModeTest config = new QuarkusProdModeTest()
+            .withApplicationRoot((jar) -> jar.addClasses(GreetingResource.class))
+            .setApplicationName(APP_NAME)
+            .setApplicationVersion("0.1-SNAPSHOT")
+            .overrideConfigKey("quarkus.kubernetes.strategy", STRATEGY_TYPE)
+            .overrideConfigKey("quarkus.kubernetes.rolling-update.max-unavailable", MAX_UNAVAILABLE)
+            .overrideConfigKey("quarkus.kubernetes.rolling-update.max-surge", MAX_SURGE)
+            .setForcedDependencies(List.of(Dependency.of("io.quarkus", "quarkus-kubernetes", Version.getVersion())));
+
+    @ProdBuildResults
+    private ProdModeTestResults prodModeTestResults;
+
+    @Test
+    public void assertGeneratedResources() throws IOException {
+        final Path kubernetesDir = prodModeTestResults.getBuildDir().resolve("kubernetes");
+        assertThat(kubernetesDir)
+                .isDirectoryContaining(p -> p.getFileName().endsWith("kubernetes.json"))
+                .isDirectoryContaining(p -> p.getFileName().endsWith("kubernetes.yml"));
+        List<HasMetadata> kubernetesList = DeserializationUtil
+                .deserializeAsList(kubernetesDir.resolve("kubernetes.yml"));
+
+        assertThat(kubernetesList.get(0)).isInstanceOfSatisfying(Deployment.class, d -> {
+            assertThat(d.getMetadata()).satisfies(m -> {
+                assertThat(m.getName()).isEqualTo(APP_NAME);
+            });
+
+            assertThat(d.getSpec()).satisfies(spec -> {
+                assertThat(spec.getStrategy().getType()).isEqualTo(STRATEGY_TYPE);
+                assertThat(spec.getStrategy().getRollingUpdate()).isNotNull();
+                assertThat(spec.getStrategy().getRollingUpdate().getMaxUnavailable().getStrVal()).isEqualTo(MAX_UNAVAILABLE);
+                assertThat(spec.getStrategy().getRollingUpdate().getMaxSurge().getStrVal()).isEqualTo(MAX_SURGE);
+            });
+        });
+    }
+}