k8s v1.19.1 修改系统镜像地址过程记录
    1.系统镜像列表

    k8s.gcr.io/kube-apiserver:v1.19.1
    k8s.gcr.io/kube-scheduler:v1.19.1
    k8s.gcr.io/kube-controller-manager:v1.19.1
    k8s.gcr.io/kube-proxy:v1.19.1
    k8s.gcr.io/pause:3.2
    k8s.gcr.io/coredns:1.7.0

    2.将原始景象打标签，推送至某公有镜像库，不需要密码认证那种（没解决私有库问题，会报错pod类型不兼容imagePullSecrets）
    3.分别修改master节点的image

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    3    		 /etc/kubernetes/manifests/kube-apiserver.yaml
    /etc/kubernetes/manifests/kube-controller-manager.yaml
    /etc/kubernetes/manifests/kube-scheduler.yaml

    4.修改coredns(能有其他不动yaml的修改方法请教教小弟)

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    2    		 kubectl -n kube-system ``get deploy/coredns -o yaml
    kubectl -n kube-system edit deploy/coredns

    5.修改proxy(同上)

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    2    		 kubectl -n kube-system ``get ds/kube-proxy -o yaml
    kubectl -n kube-system edit ds/kube-proxy

    6.未完，最后一个镜像pause还没找到应用的路径，留待补充(未验证)

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    5    		 vi /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf

    Environment=``"KUBELET_POD_INFRA_CONTAINER=–pod-infra-container-image={k8s.gcr.io}/pause:3.2"
    systemctl daemon-reload
    systemctl restart kubelet