问题1: pod启动失败, 通过kubectl -n kube-system describe pod 查到失败原因是下载镜像失败
解决方法: 使用microk8s.ctr从国内源下载镜像，再给镜像打个tag，需要下载的镜像如下：
k8s.gcr.io/pause:3.7
docker.io/calico/cni:v3.25.1
docker.io/calico/node:v3.25.1
docker.io/calico/kube-controllers:v3.25.1
docker.io/coredns/coredns:1.10.1
registry.k8s.io/ingress-nginx/controller:v1.11.2
registry.k8s.io/metrics-server/metrics-server:v0.6.3
从国内源下载镜像，再给镜像打tag
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/pause:3.7
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/pause:3.7 registry.k8s.io/pause:3.7
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/calico/cni:v3.25.1
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/calico/cni:v3.25.1 docker.io/calico/cni:v3.25.1
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/calico/node:v3.25.1
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/calico/node:v3.25.1 docker.io/calico/node:v3.25.1
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/calico/kube-controllers:v3.25.1
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/calico/kube-controllers:v3.25.1 docker.io/calico/kube-controllers:v3.25.1
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/coredns/coredns:v1.10.1
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/coredns/coredns:v1.10.1 docker.io/coredns/coredns:1.10.1
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/ingress-nginx/controller:v1.11.2
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/ingress-nginx/controller:v1.11.2 registry.k8s.io/ingress-nginx/controller:v1.11.2
microk8s.ctr images pull swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/metrics-server/metrics-server:v0.6.3
microk8s.ctr images tag swr.cn-north-4.myhuaweicloud.com/ddn-k8s/registry.k8s.io/metrics-server/metrics-server:v0.6.3 registry.k8s.io/metrics-server/metrics-server:v0.6.3
问题2: metrics-server启动失败, 'dial tcp XXX:10250: connect: no route to host"
解决方法：关闭防火墙，禁用SELinux
systemctl disable firewalld --now
setenforce 0
vim /etc/selinux/config
SELINX=enforcing这行改成SELINUX=permissive