[root@k8-master ~]# kubeadm init

[controlplane] Wrote Static Pod manifest for component kube-scheduler to 
"/etc/kubernetes/manifests/kube-scheduler.yaml"
[etcd] Wrote Static Pod manifest for a local etcd instance to 
"/etc/kubernetes/manifests/etcd.yaml"
[init] Waiting for the kubelet to boot up the control plane as Static Pods from 
directory "/etc/kubernetes/manifests".
[init] This might take a minute or longer if the control plane images have to 
be pulled.
Unfortunately, an error has occurred:
        timed out waiting for the condition
This error is likely caused by:
        - The kubelet is not running
        - The kubelet is unhealthy due to a misconfiguration of the node in 
some way (required cgroups disabled)
        - Either there is no internet connection, or imagePullPolicy is set to 
"Never",
          so the kubelet cannot pull or find the following control plane images:
                - k8s.gcr.io/kube-apiserver-amd64:v1.10.2
                - k8s.gcr.io/kube-controller-manager-amd64:v1.10.2
                - k8s.gcr.io/kube-scheduler-amd64:v1.10.2
                - k8s.gcr.io/etcd-amd64:3.1.12 (only if no external etcd 
endpoints are configured)

If you are on a systemd-powered system, you can try to troubleshoot the error 
with the following commands:
        - 'systemctl status kubelet'
        - 'journalctl -xeu kubelet'
couldn't initialize a Kubernetes cluster


[root@k8-master ~]# systemctl status kubelet
â kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: 
disabled)
  Drop-In: /etc/systemd/system/kubelet.service.d
           ââ10-kubeadm.conf
   Active: active (running) since Mon 2018-05-07 21:45:11 AEST; 18h ago
     Docs: http://kubernetes.io/docs/
 Main PID: 13861 (kubelet)
   CGroup: /system.slice/kubelet.service
           ââ13861 /usr/bin/kubelet 
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf 
--kubeconfig=/etc/kubernetes/kubelet.conf --pod-manifest...

May 08 15:52:51 k8-master.my.domian.com kubelet[13861]: W0508 15:52:51.055636   
13861 cni.go:171] Unable to update cni config: No ne.../net.d
May 08 15:52:51 k8-master.my.domian.com kubelet[13861]: E0508 15:52:51.055940   
13861 kubelet.go:2125] Container runtime network not...alized
May 08 15:52:52 k8-master.my.domian.com kubelet[13861]: E0508 15:52:52.184125   
13861 summary.go:102] Failed to get system container stats...


[root@k8-master ~]# journalctl -xeu kubelet
May 08 15:50:14 k8-master.my.domian.com kubelet[13861]: W0508 15:50:14.526580   
13861 container_manager_linux.go:794] MemoryAccounting not en
May 08 15:50:15 k8-master.my.domian.com kubelet[13861]: W0508 15:50:15.928944   
13861 cni.go:171] Unable to update cni config: No networks fo
May 08 15:50:15 k8-master.my.domian.com kubelet[13861]: E0508 15:50:15.929071   
13861 kubelet.go:2125] Container runtime network not ready: N
May 08 15:50:20 k8-master.my.domian.com kubelet[13861]: W0508 15:50:20.932914   
13861 cni.go:171] Unable to update cni config: No networks fo
May 08 15:50:20 k8-master.my.domian.com kubelet[13861]: E0508 15:50:20.933153   
13861 kubelet.go:2125] Container runtime network not ready: N
May 08 15:50:21 k8-master.my.domian.com kubelet[13861]: E0508 15:50:21.829601   
13861 summary.go:102] Failed to get system container stats fo
May 08 15:50:25 k8-master.my.domian.com kubelet[13861]: W0508 15:50:25.937301   
13861 cni.go:171] Unable to update cni config: No networks fo
May 08 15:50:25 k8-master.my.domian.com kubelet[13861]: E0508 15:50:25.937555   
13861 kubelet.go:2125] Container runtime network not ready: N
May 08 15:50:30 k8-master.my.domian.com kubelet[13861]: W0508 15:50:30.939636   
13861 cni.go:171] Unable to update cni config: No networks fo

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