Kubernetes 节点 NotReady 可能是由于 reconciler.go 中的无效内存地址或 nil 指针取消引用

Question

我的实验性双节点 Kubernetes 1.13.2 不幸进入了第二个节点为 NotReady 的模式。 .我试过systemctl restart kubelet在两个节点上，但到目前为止这没有帮助。
journalctl -u kubelet.service在主节点上以这一行结束:

reconciler.go:154] Reconciler: start to sync state

journalctl -u kubectl.service在第二个节点上包含这些行:

server.go:999] Started kubelet
kubelet.go:1308] Image garbage collection failed once. Stats initialization may not have completed yet: failed to get imageFs info: unable to find data in memory cache
kubelet.go:1412] No api server defined - no node status update will be sent.
fs_resource_analyzer.go:66] Starting FS ResourceAnalyzer
status_manager.go:148] Kubernetes client is nil, not starting status manager.
kubelet.go:1829] Starting kubelet main sync loop.
kubelet.go:1846] skipping pod synchronization - [container runtime status check may not have completed yet PLEG is not healthy: pleg has yet to be successful]
server.go:137] Starting to listen on 0.0.0.0:10250
server.go:333] Adding debug handlers to kubelet server.
volume_manager.go:248] Starting Kubelet Volume Manager
desired_state_of_world_populator.go:130] Desired state populator starts to run
container.go:409] Failed to create summary reader for "/system.slice/atop.service": none of the resources are being tracked.
kubelet.go:1846] skipping pod synchronization - [container runtime status check may not have completed yet]
kubelet_node_status.go:278] Setting node annotation to enable volume controller attach/detach
cpu_manager.go:155] [cpumanager] starting with none policy
cpu_manager.go:156] [cpumanager] reconciling every 10s
policy_none.go:42] [cpumanager] none policy: Start
kubelet_node_status.go:278] Setting node annotation to enable volume controller attach/detach
reconciler.go:154] Reconciler: start to sync state
runtime.go:69] Observed a panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:76
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:65
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:51
/usr/local/go/src/runtime/asm_amd64.s:522
/usr/local/go/src/runtime/panic.go:513
/usr/local/go/src/runtime/panic.go:82
/usr/local/go/src/runtime/signal_unix.go:390
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler/reconciler.go:562
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler/reconciler.go:599
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler/reconciler.go:419
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler/reconciler.go:330
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler/reconciler.go:155
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:133
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:134
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88
/workspace/anago-v1.13.2-beta.0.75+cff46ab41ff0bb/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/kubelet/volumemanager/reconciler/reconciler.go:143
/usr/local/go/src/runtime/asm_amd64.s:1333
kubelet_node_status.go:278] Setting node annotation to enable volume controller attach/detach
kubelet_node_status.go:278] Setting node annotation to enable volume controller attach/detach
...

这是怎么回事，我该如何补救这种情况？

更新 我现在停止了 kubelet.service在两个节点上，然后删除所有 docker 容器( docker rm )和图像( docker rmi )也在两个节点上。然后我重新启动了 kubelet.service只在主人身上。 Kubernetes 显然会拉入所有自己的镜像并重新启动它们，但现在在 journalctl -u kubelet.service 中看到多个连接被拒绝错误， 如:

kubelet_node_status.go:94] Unable to register node "my_node" with API server: Post https://my_master:6443/api/v1/nodes: dial tcp my_master:6443: connect: connection refused

kubectl get nodes仍然可以正常访问 API 服务器。所以也许这更接近我所面临的根本原因。假设此时 kubelet 正在尝试连接到 API 服务器是否正确？如何检查相关凭证是否完好无损？

Answer 1

如果不查看整个配置，很难进行故障排除。

但是请尝试遵循此检查表。

确保 kubeconfig 设置正确。

您是否启用了 master 和 worker 中的所有服务？节点 systemctl enable {组件}

检查您的 kubelet.service 中是否有正确的公共(public) IP 指向您的 api-server(这似乎是关于最后一条评论的错误)或检查它，除非您在同一台机器上(本地主机)

检查当时对我有用的这些链接以引导 k8s 集群。 https://medium.com/containerum/4-ways-to-bootstrap-a-kubernetes-cluster-de0d5150a1e4和 https://github.com/kelseyhightower/kubernetes-the-hard-way/blob/master/docs/09-bootstrapping-kubernetes-workers.md