一、

error: failed to run Kubelet: failed to create kubelet: misconfiguration: kubelet cgroup driver: "systemd" is different from docker cgroup driver: "cgroupfs"

解決：

vi /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
update KUBELET_CGROUP_ARGS=--cgroup-driver=systemd to KUBELET_CGROUP_ARGS=--cgroup-driver=cgroupfs

restart kubelet

二、

Unable to connect to the server: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")

解決：export KUBECONFIG=/etc/kubernetes/kubelet.conf

三、Failed to request cluster info, will try again: [Get https://192.168.57.4:6443/api/v1/namespaces/kube-public/configmaps/cluster-info: x509: certificate has expired or is not yet valid]

解決：同步master和node的時間

四、The connection to the server localhost:8080 was refused - did you specify the right host or port?

解決：

export KUBECONFIG=/etc/kubernetes/admin.conf

定義在6443埠 而不是8080

五、runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

解決：

1.刪除/etc/systemd/system/kubelet.service.d/10-kubeadm.conf裡最後一行裡的$KUBELET_NETWORK_ARGS

2.重啟kubelet  systemctl enable kubelet && systemctl start kubelet

3.重新加入 kubeadm reset || kubeadm join ….

六、pod ContainerCreating Or Error

default       po/httpd-68f9d7648d-5f9gt                0/1       ContainerCreating   0          1m        <none>          tensorflow0

describe一下 說sadbox建立失敗。 

1. Warning FailedCreatePodSandBox 20s (x12 over 54s) kubelet, tensorflow0 Failed create pod sandbox.

2. Normal SandboxChanged 20s (x12 over 53s) kubelet, tensorflow0 Pod sandbox changed, it will be killed and re-created

解決：一般歸結為網路問題，檢視或重啟網路（calico或flanneld） 

七、kube-dns 啟動不成功

kube-system   po/kube-dns-6f4fd4bdf-p5x4k              0/3       Pending   0          14m

①修改 /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

刪除$KUBELET_NETWORK_ARGS         （別這麼做，不推薦）

②dns異常，kubeadm reset重來，試試先初始化master，然後配置calico或flannel網路，ok了以後，再加入其它機器

重啟

systemctl daemon-reload && systemctl restart kubelet

kubeadm reset

kubeadm init --kubernetes-version=v1.9.0 --pod-network-cidr=10.244.0.0/16