Fix k3s for latest Docker for Mac (cgroupsv2)

modules/k3s/src/main/java/org/testcontainers/k3s/K3sContainer.java

@@ -6,6 +6,7 @@
 import com.fasterxml.jackson.databind.node.TextNode;
 import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
 import com.github.dockerjava.api.command.InspectContainerResponse;
+import com.github.dockerjava.api.model.DockerObjectAccessor;
 import lombok.SneakyThrows;
 import org.testcontainers.containers.BindMode;
 import org.testcontainers.containers.GenericContainer;
@@ -25,6 +26,11 @@ public K3sContainer(DockerImageName dockerImageName) {
 
         addExposedPorts(6443, 8443);
         setPrivilegedMode(true);
+        withCreateContainerCmdModifier(it -> {
+            DockerObjectAccessor.overrideRawValue(
+                it.getHostConfig(), "CgroupnsMode", "host"
+            );
+        });
         addFileSystemBind("/sys/fs/cgroup", "/sys/fs/cgroup", BindMode.READ_WRITE);
 
         Map<String, String> tmpFsMapping = new HashMap<>();

modules/k3s/src/test/java/org/testcontainers/k3s/Fabric8K3sContainerTest.java

@@ -1,15 +1,27 @@
 package org.testcontainers.k3s;
 
+import io.fabric8.kubernetes.api.model.ContainerBuilder;
+import io.fabric8.kubernetes.api.model.ContainerPortBuilder;
 import io.fabric8.kubernetes.api.model.Node;
+import io.fabric8.kubernetes.api.model.Pod;
+import io.fabric8.kubernetes.api.model.PodBuilder;
+import io.fabric8.kubernetes.api.model.PodSpec;
+import io.fabric8.kubernetes.api.model.PodSpecBuilder;
+import io.fabric8.kubernetes.api.model.ProbeBuilder;
 import io.fabric8.kubernetes.client.Config;
 import io.fabric8.kubernetes.client.DefaultKubernetesClient;
+import io.fabric8.kubernetes.client.dsl.PodResource;
+import io.fabric8.kubernetes.client.dsl.Readiable;
 import lombok.extern.slf4j.Slf4j;
 import org.assertj.core.api.Assertions;
+import org.assertj.core.api.Condition;
 import org.junit.Test;
 import org.testcontainers.containers.output.Slf4jLogConsumer;
 import org.testcontainers.utility.DockerImageName;
 
 import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 @Slf4j
 public class Fabric8K3sContainerTest {
@@ -38,6 +50,36 @@ public void shouldStartAndHaveListableNode() {
             // }
 
             Assertions.assertThat(nodes).hasSize(1);
+
+            // verify that we can start a pod
+            Pod helloworld = dummyStartablePod();
+            client.pods().create(helloworld);
+            client.pods().inNamespace("default").withName("helloworld").waitUntilReady(30, TimeUnit.SECONDS);
+
+            Assertions.assertThat(client.pods().inNamespace("default").withName("helloworld"))
+                .extracting(Readiable::isReady)
+                .isEqualTo(true);
         }
     }
+
+    private Pod dummyStartablePod() {
+        PodSpec podSpec = new PodSpecBuilder()
+            .withContainers(
+                new ContainerBuilder()
+                    .withName("helloworld")
+                    .withImage("testcontainers/helloworld:1.1.0")
+                    .withPorts(new ContainerPortBuilder().withContainerPort(8080).build())
+                    .withReadinessProbe(new ProbeBuilder().withNewTcpSocket().withNewPort(8080).endTcpSocket().build())
+                    .build()
+            )
+            .build();
+
+        return new PodBuilder()
+            .withNewMetadata()
+            .withName("helloworld")
+            .withNamespace("default")
+            .endMetadata()
+            .withSpec(podSpec)
+            .build();
+    }
 }