为了简化开发环境，我在WSL Ubuntu 虚拟机上安装了一个microk8s环境，接着在项目开发中，想用kubernetes-maven-plugin部署一个服务到k8s上，但出现错误：
[WARNING] Error reading service account token from: [/var/run/secrets/kubernetes.io/serviceaccount/token]. Ignoring.
[WARNING] F8: Cannot access cluster for detecting mode: Unknown host kubernetes.default.svc
看来plugin默认的k8s主机是kubernetes.default.svc，一时又找不着在哪儿修改这个主机名，于是，我就在/etc/hosts里加上这个域名，让它指向127.0.0.1，再试一下，又出现一个问题：
[ERROR] Failed to execute goal org.eclipse.jkube:kubernetes-maven-plugin:1.16.1:deploy (default-cli) on project webdemo: Execution default-cli of goal org.eclipse.jkube:kubernetes-maven-plugin:1.16.1:deploy failed: An error has occurred.: Failed to connect to kubernetes.default.svc/127.0.0.1:443: Connection refused -> [Help 1]
这下域名问题解决了，又发现端口443不行，于是查询一下
$ kubectl cluster-info
Kubernetes control plane is running at https://127.0.0.1:16443
CoreDNS is running at https://127.0.0.1:16443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
原来端口是16443，然后一顿狂搜，也没找到结果，后来在microk8s找到办法了：https://microk8s.io/docs/working-with-kubectl
然后执行如下命令：
cd $HOME
mkdir .kube
cd .kube
microk8s config > config
再执行一下部署命令：
mvn k8s:resource k8s:deploy
终于正常了。