ContainerListenDecorator

CLAUDE.md

@@ -0,0 +1,2 @@
+All tests in this plugin which touch an actual Kubernetes cluster (mainly those extending @src/test/java/org/csanchez/jenkins/plugins/kubernetes/pipeline/AbstractKubernetesPipelineTest.java) require you to pass `-Pktunnel` to Maven.
+Also use `-DforkCount=1` when running multiple cluster-based test classes at once to disable concurrency, since the tests use fixed port numbers.

README.md

@@ -198,11 +198,13 @@ The container specified by `agentContainer` will be the one where shell steps (o
 
 To execute commands in another container part of the pod (different from the one running the Jenkins agent), you can use the `container` step.
 
-**Note**
----
-Due to implementation constraints, there can be issues when executing commands in different containers if they run using different uids.
-It is recommended to use the same uid across the different containers part of the same pod to avoid any issue.
----
+> [!NOTE]
+> Due to implementation constraints, there can be issues when executing commands in different containers if they run using different uids.
+> It is recommended to use the same uid across the different containers part of the same pod to avoid any issue.
+
+> [!NOTE]
+> The default implementation of the `container` step does not scale well.
+> Consider selecting the **Use active containers** option in cloud configuration for a more efficient mode.
 
 ```groovy
 podTemplate(

pom.xml

@@ -51,6 +51,7 @@
     <spotless.check.skip>false</spotless.check.skip>
     <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
     <banObsoleteDependencyOverrides.skip>false</banObsoleteDependencyOverrides.skip>
+    <jenkins-test-harness.version>2573.vd91b_8a_43e019</jenkins-test-harness.version>
   </properties>
 
   <dependencyManagement>

src/main/java/org/csanchez/jenkins/plugins/kubernetes/KubernetesCloud.java

@@ -173,6 +173,9 @@ public class KubernetesCloud extends Cloud implements PodTemplateGroup {
     @CheckForNull
     private GarbageCollection garbageCollection;
 
+    /** @see ContainerListenDecorator */
+    private boolean activeContainers;
+
     @NonNull
     private DescribableList<KubernetesCloudTrait, KubernetesCloudTraitDescriptor> traits =
             new DescribableList<>(Saveable.NOOP);
@@ -377,6 +380,14 @@ public void setGarbageCollection(GarbageCollection garbageCollection) {
         this.garbageCollection = garbageCollection;
     }
 
+    public boolean isActiveContainers() {
+        return activeContainers;
+    }
+
+    @DataBoundSetter
+    public void setActiveContainers(boolean activeContainers) {
+        this.activeContainers = activeContainers;
+    }
     /**
      * Get list of traits enabled for this cloud.
      * @return configured traits, never null

src/main/java/org/csanchez/jenkins/plugins/kubernetes/PodTemplateBuilder.java

@@ -92,7 +92,7 @@ public class PodTemplateBuilder {
 
     private static final Logger LOGGER = Logger.getLogger(PodTemplateBuilder.class.getName());
 
-    private static final String WORKSPACE_VOLUME_NAME = "workspace-volume";
+    public static final String WORKSPACE_VOLUME_NAME = "workspace-volume";
     public static final Pattern FROM_DIRECTIVE = Pattern.compile("^FROM (.*)$");
 
     public static final String LABEL_KUBERNETES_CONTROLLER = "kubernetes.jenkins.io/controller";