[BUG] yurtadm join with kube-apisvr addr only override localhost:6443

[rayne-Li]

What happened:
by installing yurthub by doc: https://openyurt.io/zh/docs/installation/manually-setup#32-%E5%AE%89%E8%A3%85-yurthub-%E7%9B%B8%E5%85%B3%E9%85%8D%E7%BD%AE

helm upgrade --install yurt-hub -n kube-system --set kubernetesServerAddr=https://1.2.3.4:6443 openyurt/yurthub

kube-apisvr addr in configmap yurt-static-set-yurt-hub will be set to https://1.2.3.4:6443, then if we join edge node with yurtadm join {{https://external_ip:6443}}, will not change kube-apisvr-addr from 1.2.3.4:6443 to external_ip:6443

according to the func useRealServerAddr, only https://127.0.0.1:6443(constants.DefaultServerAddr) will be overwrite by yurtadm join command, if we set it before(by helm install), nothing will changed

// useRealServerAddr check if the server-addr from yurthubTemplate is default value: 127.0.0.1:6443
// if yes, we should use the real server addr
func useRealServerAddr(yurthubTemplate string, kubernetesServerAddrs string) (string, error) {
	scanner := bufio.NewScanner(bytes.NewReader([]byte(yurthubTemplate)))
	var buffer bytes.Buffer
	target := fmt.Sprintf("%v=%v", constants.ServerAddr, constants.DefaultServerAddr)

	for scanner.Scan() {
		line := scanner.Text()
		if strings.Contains(line, target) {
			line = strings.Replace(line, constants.DefaultServerAddr, kubernetesServerAddrs, -1)
		}
		buffer.WriteString(line + "\n")
	}

What you expected to happen:

in my POV, we install yurthub in cloud node first(usually by internal ip like 172.0.0.11), then we join cloud node by yurtadm join {internal_ip}, last we join edge node by yurtadm join {external_ip}, so ip should always be overwritten since it will not be 127.0.0.1 by helm install by 172.0.0.11

here is my solution:

func useRealServerAddr(yurthubTemplate string, kubernetesServerAddrs string) (string, error) {
	scanner := bufio.NewScanner(bytes.NewReader([]byte(yurthubTemplate)))
	var buffer bytes.Buffer
	// compile ipv4 regex
	ipRegex := regexp.MustCompile(`https?://(?:[0-9]{1,3}\.){3}[0-9]{1,3}:\d+`)

	// scan template and replace setAddr
	for scanner.Scan() {
		line := scanner.Text()
		if strings.Contains(line, fmt.Sprintf("- --%s=", constants.ServerAddr)) {
			// replace kubernetesServerAddrs by new addr
			line = ipRegex.ReplaceAllString(line, kubernetesServerAddrs)
		}
		buffer.WriteString(line + "\n")
	}

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• OpenYurt version: 1.5.0
• Kubernetes version (use kubectl version): 1.31
• OS (e.g: cat /etc/os-release): debian12
• Kernel (e.g. uname -a): 6.1.119-1 (2024-11-22)
• Install tools:
• Others:

others

/kind bug