i have a problem issues with Kubernetes worker, i am have 2 machines first as master and second as worker (node). ubuntu server Ubuntu 18.04.3 LTS when i run the following command:

kubectl describe node kubernetes-worker

the following output:

Name:               kubernetes-worker
Roles:              
Labels:             beta.kubernetes.io/arch=amd64
                beta.kubernetes.io/os=linux
                kubernetes.io/arch=amd64
                kubernetes.io/hostname=kubernetes-worker
                kubernetes.io/os=linux
                role=worker
Annotations:        flannel.alpha.coreos.com/backend-data: {"VtepMAC":"82:22:c1:fa:c8:61"}
                flannel.alpha.coreos.com/backend-type: vxlan
                flannel.alpha.coreos.com/kube-subnet-manager: true
                flannel.alpha.coreos.com/public-ip: 192.168.1.36
                kubeadm.alpha.kubernetes.io/cri-socket: /var/run/dockershim.sock
                node.alpha.kubernetes.io/ttl: 0
                volumes.kubernetes.io/controller-managed-attach-detach: true
 CreationTimestamp:  Mon, 02 Dec 2019 09:31:37 +0000
  Taints:             node.kubernetes.io/unreachable:NoSchedule
  Unschedulable:      false
  Conditions:

Type Status LastHeartbeatTime LastTransitionTime Reason Message

MemoryPressure Unknown Sat, 28 Dec 2019 15:31:21 +0000 Mon, 30 Dec 2019 06:31:26 +0000 NodeStatusUnknown Kubelet stopped posting node status. DiskPressure Unknown Sat, 28 Dec 2019 15:31:21 +0000 Mon, 30 Dec 2019 06:31:26 +0000 NodeStatusUnknown Kubelet stopped posting node status. PIDPressure Unknown Sat, 28 Dec 2019 15:31:21 +0000 Mon, 30 Dec 2019 06:31:26 +0000 NodeStatusUnknown Kubelet stopped posting node status. Ready Unknown Sat, 28 Dec 2019 15:31:21 +0000 Mon, 30 Dec 2019 06:31:26 +0000 NodeStatusUnknown Kubelet stopped posting node status. Addresses: InternalIP: 192.168.1.36 Hostname: kubernetes-worker Capacity: cpu: 2 ephemeral-storage: 130551876Ki hugepages-1Gi: 0 hugepages-2Mi: 0 memory: 3918032Ki pods: 110 Allocatable: cpu: 2 ephemeral-storage: 120316608723 hugepages-1Gi: 0 hugepages-2Mi: 0 memory: 3815632Ki pods: 110 System Info: Machine ID: c87a16d69ec94e03a8a281b2d54c722c System UUID: F493BA8E-F779-234F-AC40-C4899AC930B9 Boot ID: f9b6eb1e-0a6b-4765-b8d6-1e5527a7f970 Kernel Version: 4.15.0-70-generic OS Image: Ubuntu 18.04.3 LTS Operating System: linux Architecture: amd64 Container Runtime Version: docker://18.9.7 Kubelet Version: v1.16.3 Kube-Proxy Version: v1.16.3 PodCIDR: 10.244.1.0/24 PodCIDRs: 10.244.1.0/24 Non-terminated Pods: (2 in total) Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits AGE

kube-system kube-flannel-ds-amd64-ssk8h 100m (5%) 100m (5%) 50Mi (1%) 50Mi (1%) 51d kube-system kube-proxy-965g2 0 (0%) 0 (0%) 0 (0%) 0 (0%) 51d Allocated resources: (Total limits may be over 100 percent, i.e., overcommitted.) Resource Requests Limits

cpu 100m (5%) 100m (5%) memory 50Mi (1%) 50Mi (1%) ephemeral-storage 0 (0%) 0 (0%) `

what the problem and how i resolve this, this happened from nowhere i don't touch any settings or something. thank for help.

Update

<pre> 947 summary_sys_containers.go:47] Failed to get system container stats for "/system.slice/docker.service": failed to get cgroup stats Jan 23 07:26:27 kubernetes-master kubelet[947]: E0123 07:26:27.344712 947 summary_sys_containers.go:47] Failed to get system container stats for "/system.slice/docker.service": failed to get cgroup stats Jan 23 07:26:37 kubernetes-master kubelet[947]: E0123 07:26:37.446034 947 summary_sys_containers.go:47] Failed to get system container stats for "/system.slice/docker.service": failed to get cgroup stats </pre>