zryfish

Prerequisities

A running KubeSphere cluster (Kubernetes version >v1.15.x <v1.19.x)
Go (>1.11.x)
Docker (18.x)
Telepresence - for debugging (https://www.telepresence.io/ )
kubebuilder (latest stable version is ok https://github.com/kubernetes-sigs/kubebuilder)
More tools for debugging https://github.com/kubernetes/community/blob/master/contributors/devel/development.md#installing-required-software

	#!/bin/sh
	set -x

	node=${1}
	nodeName=$(kubectl get node ${node} -o template --template='{{index .metadata.labels "kubernetes.io/hostname"}}')
	nodeSelector='"nodeSelector": { "kubernetes.io/hostname": "'${nodeName:?}'" },'
	podName=exec-${node}

	kubectl run ${podName:?} --restart=Never -it --rm --image overriden --overrides '
	{

	package main

	import (
	"fmt"
	"github.com/emicklei/go-restful"
	"net/http"
	"time"
	)

	func downloadHandler(request restful.Request, response restful.Response) {


	import (
	"fmt"
	esv5 "github.com/elastic/go-elasticsearch/v5"
	esv6 "github.com/elastic/go-elasticsearch/v6"
	esv7 "github.com/elastic/go-elasticsearch/v7"
	)

	type ES_VERSION string

	# make sure this script executed on master node

	source /data/kubernetes/env.sh

	# backup master node certificates
	cp -r /etc/kubernetes/pki /etc/kubernetes/pki_backup

	# remove expired certificates

	rm /etc/kubernetes/pki/apiserver-kubelet-client.crt


	source /data/kubernetes/env.sh

	KUBECONFIG=`base64 /etc/kubernetes/admin.conf \| tr -d "\n"`

	INITTOKEN=`kubeadm token list \| grep forever \| awk '{print $1}'`

	JSON="{\"clusters\":{\"CLUSTERID\":{\"hosts\":{\"master\":{\"INSTANCEID\":{\"token\":\"{\\\"init_token\\\":\\\"INITTOKEN\\\",\\\"adminconf\\\":\\\"KUBECONFIG\\\"}\"}}}}}}"

	echo $JSON \| sed -e "s/CLUSTERID/${CLUSTER_ID}/g" \| sed -e "s/INSTANCEID/${HOST_INSTANCE_ID}/g" \| sed -e "s/INITTOKEN/${INITTOKEN}/g" \| sed -e "s/KUBECONFIG/${KUBECONFIG}/g" > token.json

	kubectl delete csr --all
	kubectl get node -lrole!=master -o=jsonpath='{range .items[*]}{.status.addresses[0].address}{"\n"}{end}' \| xargs -I {} ssh {} "rm /etc/kubernetes/kubelet.conf && systemctl restart kubelet"
	kubectl get csr

	# Source: istio/charts/prometheus/templates/configmap.yaml
	apiVersion: v1
	kind: ConfigMap
	metadata:
	name: prometheus
	namespace: istio-system
	labels:
	app: prometheus
	chart: prometheus-1.0.6
	release: istio