detected that the sandbox image “registry.aliyuncs.com/google_containers/pause:3.6” of the container runtime is inconsistent with that used by kubeadm.
kubeadm初始化master的时候有如下错误：
detected that the sandbox image “registry.aliyuncs.com/google_containers/pause:3.6” of the container runtime is inconsistent with that used by kubeadm. It is recommended that using “registry.aliyuncs.com/google_containers/pause:3.9” as the CRI sandbox image.
解决方法：
修改运行时containerd配置文件/etc/containerd/config.toml，把sandbox_image = "registry.k8s.io/pause:3.6"改成sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.9"。
[plugins."io.containerd.grpc.v1.cri"]
restrict_oom_score_adj = false
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.9"
selinux_category_range = 1024[ERROR FileAvailable–etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
[ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists [ERROR FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists [ERROR FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists [ERROR FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists [ERROR Port-10250]: Port 10250 is in use [ERROR Port-2379]: Port 2379 is in use [ERROR Port-2380]: Port 2380 is in use [ERROR DirAvailable--var-lib-etcd]: /var/lib/etcd is not empty解决方法：
kubeadm reset[WARNING Swap]: swap is enabled; production deployments should disable swap unless testing the NodeSwap feature gate of the kubelet
禁用Linux上的swap：
swapoff -a
