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我正在尝试使用出色的 Java 版 Fabric8 Kubernetes 客户端（https://github.com/fabric8io/kubernetes-client）构建 Kubernetes 控制器。截至目前，我使用该版本4.10.3。

为此，我正在构建一个SharedIndexInformer以正确监视集群发出的资源事件。我将在这里以 pod 作为资源示例。

所以SharedIndexInformer是按照这段代码构造的：

SharedIndexInformer<Pod> sharedIndexInformer = kubernetesClient.informers().sharedIndexInformerFor(
                objectClass,
                objectClassList,
                10 * 60 * 1000);

接下来，附加事件处理程序、启动索引器、进行协调循环等的大量代码。

从我的本地计算机启动时，索引器工作得非常好，我看到所有的 pod 都被列出来了。但是，当我在集群中的 pod 上运行它时（正确定义了 RBAC），我只看到运行 pod 的命名空间的 pod。

我在 pod 中明确检查，使用kubectl关联的服务帐户能够列出集群中的所有 pod，而不仅仅是在当前命名空间中。

我错过了什么？

在此先感谢您的帮助！

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1 回答 1

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我认为这是由于在KubernetesClientKubernetesConfig集群外部或Pod. 在前一种情况下，KubernetesClient通常从您的文件中读取~/.kube/config和连接信息（如令牌和命名空间）是从您当前的上下文中提取的~/.kube/config。

但是，当KubernetesClient在 Pod 内时；Config它从加载中获取连接信息ServiceAccount，请参阅Config.java。Bearer 令牌是从中挑选出来/var/run/secrets/kubernetes.io/serviceaccount/token的，并且用于命名空间 API 操作的默认命名空间是从 挑选出来的/var/run/secrets/kubernetes.io/serviceaccount/namespace。您可以在Kubernetes Docs: Accessing API from a Pod中找到更多相关信息。我认为KubernetesClient在加载Config.

我认为KubernetesClient没有正确处理此案。这应该在那里修复。那里已经有一个问题：https ://github.com/fabric8io/kubernetes-client/issues/2514

我不确定现在告密者是否可以检测到他们是在集群内还是在集群外（这只有在我们加载之前才知道Config）。现在，告密者提供了使用以下方法指定命名空间的方法OperationContext：

SharedInformerFactory sharedInformerFactory = client.informers();
SharedIndexInformer<Pod> podInformer = sharedInformerFactory.sharedIndexInformerFor(
        Pod.class,
        PodList.class,
        new OperationContext().withNamespace("default"),
        30 * 1000L);

也许为了覆盖这个被加载的命名空间，ServiceAccount我们可以允许设置null命名空间：

SharedIndexInformer<Pod> podInformer = sharedInformerFactory.sharedIndexInformerFor(
        Pod.class,
        PodList.class,
        new OperationContext().withNamespace(null), // -> Doesn't work; Ideally should Watch in all namespaces,
        30 * 1000L);

更新：

潜在问题似乎已在v4.13.0中得到修复。我已经在这个演示项目中对此进行了测试：https ://github.com/r0haaaan/fabric8-kubernetes-java-informer-in-pod 。它在项目中运行 SharedIndexInformers 并使用Kubernetes Maven 插件部署到 Kubernetes 。当我检查日志时，我可以看到似乎列出了所有 pod：

fabric8-kubernetes-java-informers-in-pod : $ mvn k8s:log
[INFO] Scanning for projects...
[INFO] 
[INFO] --------< org.example:fabric8-kubernetes-java-informers-in-pod >--------
[INFO] Building fabric8-kubernetes-java-informers-in-pod 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- kubernetes-maven-plugin:1.0.2:log (default-cli) @ fabric8-kubernetes-java-informers-in-pod ---
[INFO] k8s: Using Kubernetes at https://192.168.39.24:8443/ in namespace default with manifest /home/rohaan/work/repos/fabric8-kubernetes-java-informers-in-pod/target/classes/META-INF/jkube/kubernetes.yml 
[INFO] k8s: Using namespace: default
[INFO] k8s: Watching pods with selector LabelSelector(matchExpressions=[], matchLabels={app=fabric8-kubernetes-java-informers-in-pod, provider=jkube, group=org.example}, additionalProperties={}) waiting for a running pod...
[INFO] k8s:  [NEW] fabric8-kubernetes-java-informers-in-pod-6f957b6b59-tpbgd status: Running Ready
[INFO] k8s:  [NEW] Tailing log of pod: fabric8-kubernetes-java-informers-in-pod-6f957b6b59-tpbgd
[INFO] k8s:  [NEW] Press Ctrl-C to stop tailing the log
[INFO] k8s:  [NEW] 
[INFO] k8s: Starting the Java application using /opt/jboss/container/java/run/run-java.sh ...
[INFO] k8s: INFO exec  java -javaagent:/usr/share/java/jolokia-jvm-agent/jolokia-jvm.jar=config=/opt/jboss/container/jolokia/etc/jolokia.properties -javaagent:/usr/share/java/prometheus-jmx-exporter/jmx_prometheus_javaagent.jar=9779:/opt/jboss/container/prometheus/etc/jmx-exporter-config.yaml -XX:+UseParallelOldGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:MaxMetaspaceSize=100m -XX:+ExitOnOutOfMemoryError -cp "." -jar /deployments/fabric8-kubernetes-java-informers-in-pod-1.0-SNAPSHOT-jar-with-dependencies.jar  
[INFO] k8s: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
[INFO] k8s: SLF4J: Defaulting to no-operation (NOP) logger implementation
[INFO] k8s: SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] k8s: WARNING: An illegal reflective access operation has occurred
[INFO] k8s: WARNING: Illegal reflective access by org.jolokia.util.ClassUtil (file:/usr/share/java/jolokia-jvm-agent/jolokia-jvm.jar) to constructor sun.security.x509.X500Name(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String)
[INFO] k8s: WARNING: Please consider reporting this to the maintainers of org.jolokia.util.ClassUtil
[INFO] k8s: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
[INFO] k8s: WARNING: All illegal access operations will be denied in a future release
[INFO] k8s: Nov 10, 2020 5:37:50 PM io.fabric8.testing.SimpleSharedInformerRun main
[INFO] k8s: INFO: k8s.getConfiguration().getNamespace(): default
[INFO] k8s: I> No access restrictor found, access to any MBean is allowed
[INFO] k8s: Jolokia: Agent started with URL https://172.17.0.6:8778/jolokia/
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: default/fabric8-kubernetes-java-informers-in-pod-6f957b6b59-tpbgd
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: istio-system/istio-ingressgateway-64cfb9d44b-kk5ft
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: istio-system/istiod-7684b696d6-fhzwt
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/coredns-f9fd979d6-g4htj
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/etcd-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/kube-apiserver-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/kube-controller-manager-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/kube-proxy-tpsrg
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/kube-scheduler-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/metrics-server-d9b576748-4w6jz
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: kube-system/storage-provisioner
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onAdd
[INFO] k8s: INFO: ADDED: rokumar/multi-container-pod
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: default/fabric8-kubernetes-java-informers-in-pod-6f957b6b59-tpbgd
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: istio-system/istio-ingressgateway-64cfb9d44b-kk5ft
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: istio-system/istiod-7684b696d6-fhzwt
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/coredns-f9fd979d6-g4htj
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/etcd-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/kube-apiserver-minikube
[INFO] k8s:  [NEW] fabric8-kubernetes-java-informers-in-pod-6f957b6b59-tpbgd status: Running Ready
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/kube-controller-manager-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/kube-proxy-tpsrg
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/kube-scheduler-minikube
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/metrics-server-d9b576748-4w6jz
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: kube-system/storage-provisioner
[INFO] k8s: Nov 10, 2020 5:37:52 PM io.fabric8.testing.SimpleSharedInformerRun$1 onUpdate
[INFO] k8s: INFO: UPDATED: rokumar/multi-container-pod
于 2020-10-06T19:31:35.697 回答