allard
683 lines
19 KiB
Plaintext
683 lines
19 KiB
Plaintext
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"strconv"
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"strings"
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"time"
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"golang.org/x/crypto/ssh"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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metrics "k8s.io/metrics/pkg/client/clientset/versioned"
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metricsv1beta1 "k8s.io/metrics/pkg/apis/metrics/v1beta1"
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"gopkg.in/yaml.v3"
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)
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// Node and NodePool structs
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type Node struct {
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Name string `yaml:"name" json:"name"`
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IP string `yaml:"ip" json:"ip"`
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Status string `yaml:"status" json:"status"`
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CPU int `yaml:"cpu" json:"cpu"`
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Memory int `yaml:"memory" json:"memory"`
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Role string `yaml:"role" json:"role"`
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Cluster string `yaml:"cluster" json:"cluster"`
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LastActive string `yaml:"last_active" json:"last_active"`
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Pods int `yaml:"pods,omitempty" json:"pods,omitempty"`
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Temperature float64 `yaml:"temperature,omitempty" json:"temperature,omitempty"`
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}
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type NodePool struct {
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Nodes []Node `yaml:"nodes" json:"nodes"`
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}
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// --- ENV helpers ---
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func mustIntEnv(name string, def int) int {
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if val := os.Getenv(name); val != "" {
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if i, err := strconv.Atoi(val); err == nil {
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return i
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}
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}
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return def
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}
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func mustEnv(key, def string) string {
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if val := os.Getenv(key); val != "" {
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return val
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}
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return def
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}
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// --- YAML load/save ---
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func loadPool(file string) (*NodePool, error) {
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data, err := ioutil.ReadFile(file)
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if err != nil {
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return nil, err
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}
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var pool NodePool
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err = yaml.Unmarshal(data, &pool)
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if err != nil {
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return nil, err
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}
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return &pool, nil
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}
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func savePool(file string, pool *NodePool) error {
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data, err := yaml.Marshal(pool)
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if err != nil {
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return err
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}
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return ioutil.WriteFile(file, data, 0644)
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}
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// --- SSH ---
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func runSSH(host, user, pass, cmd string) (string, error) {
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config := &ssh.ClientConfig{
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User: user,
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Auth: []ssh.AuthMethod{ssh.Password(pass)},
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HostKeyCallback: ssh.InsecureIgnoreHostKey(),
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Timeout: 10 * time.Second,
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}
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client, err := ssh.Dial("tcp", fmt.Sprintf("%s:22", host), config)
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if err != nil {
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return "", err
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}
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defer client.Close()
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session, err := client.NewSession()
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if err != nil {
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return "", err
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}
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defer session.Close()
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out, err := session.CombinedOutput(cmd)
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return string(out), err
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}
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// --- Node helpers ---
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func isControlPlane(n *v1.Node) bool {
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if _, ok := n.Labels["node.kubernetes.io/microk8s-controlplane"]; ok {
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return true
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}
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if _, ok := n.Labels["node-role.kubernetes.io/control-plane"]; ok {
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return true
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}
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return false
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}
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func nodeIP(n *v1.Node) string {
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for _, addr := range n.Status.Addresses {
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if addr.Type == v1.NodeInternalIP {
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return addr.Address
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}
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}
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return ""
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}
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// updateNodePool updates CPU, Memory, Pods, Temperature, Status, and Role
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// 🟧 Only updates nodes that belong to THIS cluster (Golden Rule)
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func updateNodePool(
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clientset *kubernetes.Clientset,
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metricsClient *metrics.Clientset,
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poolFile, sshUser, sshPass string,
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) error {
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pool, err := loadPool(poolFile)
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if err != nil {
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return fmt.Errorf("cannot load node pool: %w", err)
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}
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poolMap := map[string]*Node{}
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for i := range pool.Nodes {
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poolMap[pool.Nodes[i].Name] = &pool.Nodes[i]
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}
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clusterNodes, err := clientset.CoreV1().Nodes().List(context.Background(), metav1.ListOptions{})
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if err != nil {
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return fmt.Errorf("cannot list cluster nodes: %w", err)
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}
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nodeMetricsList, err := metricsClient.MetricsV1beta1().NodeMetricses().List(context.Background(), metav1.ListOptions{})
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if err != nil {
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log.Println("cannot get node metrics:", err)
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}
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nodeMetricsMap := map[string]metricsv1beta1.NodeMetrics{}
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for _, m := range nodeMetricsList.Items {
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nodeMetricsMap[m.Name] = m
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}
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clusterName := os.Getenv("CLUSTER_NAME")
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for _, n := range clusterNodes.Items {
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poolNode := poolMap[n.Name]
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if poolNode == nil {
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continue
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}
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poolNode.Status = "online"
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poolNode.LastActive = time.Now().Format(time.RFC3339)
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poolNode.Cluster = clusterName
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if isControlPlane(&n) {
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poolNode.Role = "microk8s-controlplane"
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} else {
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poolNode.Role = "worker"
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}
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temp := getNodeTemp(poolNode, sshUser, sshPass)
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if temp > 0 {
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poolNode.Temperature = temp
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}
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if m, ok := nodeMetricsMap[n.Name]; ok {
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poolNode.CPU = int((m.Usage.Cpu().MilliValue() * 100) / n.Status.Capacity.Cpu().MilliValue())
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poolNode.Memory = int((m.Usage.Memory().Value() * 100) / n.Status.Capacity.Memory().Value())
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}
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pods, err := clientset.CoreV1().Pods("").List(context.Background(), metav1.ListOptions{
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FieldSelector: fmt.Sprintf("spec.nodeName=%s", n.Name),
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})
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if err == nil {
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poolNode.Pods = len(pods.Items)
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}
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}
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if err := savePool(poolFile, pool); err != nil {
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return fmt.Errorf("cannot save node pool: %w", err)
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}
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return nil
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}
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// --- Temperature ---
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// getNodeTemp uses the IP from the node-pool.yaml
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func getNodeTemp(node *Node, sshUser, sshPass string) float64 {
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ip := node.IP
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if ip == "" {
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log.Printf("Warning: node %s has no IP in pool, skipping temperature", node.Name)
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return 0
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}
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// call your existing SSH logic — unchanged
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out, err := runSSH(ip, sshUser, sshPass, "cat /proc/device-tree/model")
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if err != nil {
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log.Printf("getNodeTemp: failed to read model from %s: %v", ip, sshUser, sshPass, err)
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return 0
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}
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hw := strings.ToUpper(strings.TrimSpace(out))
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var cmd string
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switch {
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case strings.Contains(hw, "RASPBERRY"):
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cmd = "vcgencmd measure_temp | egrep -o '[0-9]+\\.[0-9]+'"
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case strings.Contains(hw, "ODROID"):
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cmd = "awk '{printf \"%3.1f\", $1/1000}' /sys/class/thermal/thermal_zone0/temp"
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default:
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return 0
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}
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tempStr, err := runSSH(ip, sshUser, sshPass, cmd)
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if err != nil {
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log.Printf("getNodeTemp: failed to read temperature from %s: %v", ip, err)
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return 0
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}
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t, err := strconv.ParseFloat(strings.TrimSpace(tempStr), 64)
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if err != nil {
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return 0
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}
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return t
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}
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func findPoolNodeByName(pool *NodePool, name string) *Node {
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for i := range pool.Nodes {
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if pool.Nodes[i].Name == name {
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return &pool.Nodes[i]
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}
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}
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return nil
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}
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// --- Control-plane management ---
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func ensureControlPlanes(cs *kubernetes.Clientset, poolFileName, sshUser, sshPass, clusterName string, desired int) {
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// Load the current node pool from disk
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pool, err := loadPool(poolFileName)
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if err != nil {
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log.Println("Cannot load pool in ensureControlPlanes:", err)
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return
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}
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ctx := context.Background()
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// List nodes currently in this Kubernetes cluster
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nodes, err := cs.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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log.Println("failed to list nodes:", err)
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return
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}
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// Count current control-plane nodes
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cpCount := 0
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var seedIP string
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for _, n := range nodes.Items {
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if isControlPlane(&n) {
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cpCount++
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if seedIP == "" {
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seedIP = nodeIP(&n)
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}
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}
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}
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// Nothing to do if enough control-planes
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if cpCount >= desired {
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return
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}
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if seedIP == "" {
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log.Println("no available control-plane node found")
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return
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}
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// Find an offline node in the pool to activate
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for i := range pool.Nodes {
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n := &pool.Nodes[i]
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if n.Status != "offline" {
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continue
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}
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log.Printf("Attempting to activate node %s as control-plane", n.Name)
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// Generate join command from seed control-plane
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out, err := runSSH(seedIP, sshUser, sshPass, "microk8s add-node")
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if err != nil {
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log.Println("add-node failed:", err)
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return
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}
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var joinCmd string
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for _, line := range strings.Split(out, "\n") {
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if strings.HasPrefix(strings.TrimSpace(line), "microk8s join") {
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joinCmd = strings.TrimSpace(line)
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break
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}
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}
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if joinCmd == "" {
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log.Println("no join command found")
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return
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}
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// Run join on offline node
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_, err = runSSH(n.IP, sshUser, sshPass, joinCmd)
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if err != nil {
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log.Println("join failed:", err)
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return
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}
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// Update node in pool
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n.Status = "online"
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n.Cluster = clusterName
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n.Role = "microk8s-controlplane"
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n.LastActive = time.Now().Format(time.RFC3339)
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log.Printf("Control-plane %s activated", n.Name)
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// Save back updated pool to disk
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if err := savePool(poolFileName, pool); err != nil {
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log.Println("Failed to save pool after activating control-plane:", err)
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}
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return
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}
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}
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// --- Worker management ---
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func activateOneWorker(
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cs *kubernetes.Clientset,
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pool *NodePool,
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poolFileName, sshUser, sshPass, clusterName string,
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) {
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ctx := context.Background()
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var workerNode *Node
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for i := range pool.Nodes {
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n := &pool.Nodes[i]
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if n.Status == "offline" {
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workerNode = n
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break
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}
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}
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if workerNode == nil {
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log.Println("No offline nodes available — skipping activation")
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return
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}
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log.Printf("Attempting to activate %s node as worker node", workerNode.Name)
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// Find a seed control-plane node
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nodes, err := cs.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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log.Println("Failed to list nodes:", err)
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return
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}
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var seedIP string
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for _, n := range nodes.Items {
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if isControlPlane(&n) {
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seedIP = nodeIP(&n)
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break
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}
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}
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if seedIP == "" {
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log.Println("No control-plane node available to generate join command")
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return
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}
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// Generate join command on seed control-plane
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out, err := runSSH(seedIP, sshUser, sshPass, "microk8s add-node")
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if err != nil {
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log.Println("add-node failed:", err)
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return
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}
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var joinCmd string
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for _, line := range strings.Split(out, "\n") {
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if strings.HasPrefix(strings.TrimSpace(line), "microk8s join") {
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joinCmd = strings.TrimSpace(line) + " --worker"
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break
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}
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}
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if joinCmd == "" {
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log.Println("No join command found from seed control-plane")
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return
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}
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// Run join command on the offline worker node (use pool IP)
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_, err = runSSH(workerNode.IP, sshUser, sshPass, joinCmd)
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if err != nil {
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log.Println("Worker join failed:", err)
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return
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}
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// Wait for the node to appear in the cluster and become Ready
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tick := time.Tick(5 * time.Second)
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timeout := time.After(3 * time.Minute)
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Loop:
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for {
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select {
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case <-timeout:
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log.Printf("Timeout waiting for node %s to join", workerNode.Name)
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return
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case <-tick:
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nodes, err := cs.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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log.Println("Error listing nodes:", err)
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continue
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}
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for _, n := range nodes.Items {
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if n.Name == workerNode.Name {
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for _, cond := range n.Status.Conditions {
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if cond.Type == v1.NodeReady && cond.Status == v1.ConditionTrue {
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break Loop // Node is Ready → exit
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}
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}
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}
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}
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}
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}
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// Mark node as online in pool
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workerNode.Status = "online"
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workerNode.Cluster = clusterName
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workerNode.Role = "worker"
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workerNode.LastActive = time.Now().Format(time.RFC3339)
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log.Printf("Node %s successfully activated as worker node", workerNode.Name)
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}
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func deactivateOneWorkerSafe(cs *kubernetes.Clientset, pool *NodePool, poolFileName, sshUser, sshPass, clusterName string, waitSec int) {
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ctx := context.Background()
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nodes, err := cs.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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log.Println("failed to list nodes:", err)
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return
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}
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// Find a worker node that is not cordoned
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var workerNode *v1.Node
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for _, n := range nodes.Items {
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if !isControlPlane(&n) && !n.Spec.Unschedulable {
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workerNode = &n
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break
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}
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}
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if workerNode == nil {
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log.Println("No worker nodes available for deactivation")
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return
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}
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log.Printf("Deactivating node: %s", workerNode.Name)
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poolNode := findPoolNodeByName(pool, workerNode.Name)
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if poolNode == nil {
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log.Printf("No pool node for %s", workerNode.Name)
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return
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}
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// Cordoning
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patch := []byte(`{"spec":{"unschedulable":true}}`)
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_, err = cs.CoreV1().Nodes().Patch(ctx, workerNode.Name, types.StrategicMergePatchType, patch, metav1.PatchOptions{})
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if err != nil {
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log.Println("Failed to cordon node:", err)
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return
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}
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// Drain pods
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err = drainNode(cs, workerNode.Name)
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if err != nil {
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log.Println("Drain failed, uncordoning node")
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patch = []byte(`{"spec":{"unschedulable":false}}`)
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_, _ = cs.CoreV1().Nodes().Patch(ctx, workerNode.Name, types.StrategicMergePatchType, patch, metav1.PatchOptions{})
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return
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}
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// Make the node leave the cluster
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_, err = runSSH(poolNode.IP, sshUser, sshPass, "microk8s leave")
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if err != nil {
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log.Println("microk8s leave failed, keeping node object in cluster")
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return
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}
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// Delete the node from Kubernetes
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_ = cs.CoreV1().Nodes().Delete(ctx, workerNode.Name, metav1.DeleteOptions{})
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// Update the pool node immediately — this is critical
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poolNode.Status = "offline"
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poolNode.Cluster = "none"
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poolNode.Role = "none"
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poolNode.CPU = 0
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poolNode.Memory = 0
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poolNode.Pods = 0
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poolNode.Temp = 0
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poolNode.LastActive = time.Now().Format(time.RFC3339)
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// Optional: persist pool after deactivation if you want immediate consistency
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if err := savePool(poolFileName, pool); err != nil {
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log.Println("Failed to save pool after deactivating node:", err)
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}
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}
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// --- Drain node ---
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func drainNode(cs *kubernetes.Clientset, nodeName string) error {
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ctx := context.Background()
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pods, err := cs.CoreV1().Pods("").List(ctx, metav1.ListOptions{
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FieldSelector: fmt.Sprintf("spec.nodeName=%s", nodeName),
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})
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if err != nil {
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return err
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}
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for _, pod := range pods.Items {
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if _, ok := pod.ObjectMeta.Annotations["kubernetes.io/config.mirror"]; ok {
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continue
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}
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if pod.Namespace == "kube-system" {
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continue
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}
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grace := int64(60)
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_ = cs.CoreV1().Pods(pod.Namespace).Delete(ctx, pod.Name, metav1.DeleteOptions{
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GracePeriodSeconds: &grace,
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})
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}
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for {
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remaining, _ := cs.CoreV1().Pods("").List(ctx, metav1.ListOptions{
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FieldSelector: fmt.Sprintf("spec.nodeName=%s", nodeName),
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})
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active := 0
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for _, p := range remaining.Items {
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if p.Namespace != "kube-system" && p.DeletionTimestamp == nil {
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active++
|
|
}
|
|
}
|
|
if active == 0 {
|
|
break
|
|
}
|
|
time.Sleep(5 * time.Second)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// --- Cluster utilization ---
|
|
func clusterUtilization(cs *kubernetes.Clientset, ms *metrics.Clientset) (cpuPct int, memPct int, err error) {
|
|
ctx := context.Background()
|
|
nodes, err := cs.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
|
|
if err != nil {
|
|
return 0, 0, err
|
|
}
|
|
|
|
metricsList, err := ms.MetricsV1beta1().NodeMetricses().List(ctx, metav1.ListOptions{})
|
|
if err != nil {
|
|
return 0, 0, err
|
|
}
|
|
|
|
var totalCPUCap, totalMemCap, totalCPUUse, totalMemUse int64
|
|
for _, n := range nodes.Items {
|
|
totalCPUCap += n.Status.Capacity.Cpu().MilliValue()
|
|
totalMemCap += n.Status.Capacity.Memory().Value()
|
|
}
|
|
|
|
for _, m := range metricsList.Items {
|
|
totalCPUUse += m.Usage.Cpu().MilliValue()
|
|
totalMemUse += m.Usage.Memory().Value()
|
|
}
|
|
|
|
cpuPct = int((totalCPUUse * 100) / totalCPUCap)
|
|
memPct = int((totalMemUse * 100) / totalMemCap)
|
|
return cpuPct, memPct, nil
|
|
}
|
|
|
|
// --- Web GUI ---
|
|
// startWebGUI starts a simple HTTP server showing the node pool
|
|
func startWebGUI(poolFileName string) {
|
|
// API endpoint for JSON status
|
|
|
|
http.HandleFunc("/status", func(w http.ResponseWriter, r *http.Request) {
|
|
pool, err := loadPool(poolFileName) // always fresh from disk
|
|
if err != nil {
|
|
log.Println("Cannot load node pool:", err)
|
|
http.Error(w, "cannot load node pool", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
w.Header().Set("Content-Type", "application/json")
|
|
json.NewEncoder(w).Encode(pool)
|
|
})
|
|
|
|
// Serve index.html and static assets (single file)
|
|
http.Handle("/", http.FileServer(http.Dir("/app/web")))
|
|
|
|
go func() {
|
|
log.Println("Web GUI running at :8080")
|
|
if err := http.ListenAndServe(":8080", nil); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}()
|
|
}
|
|
// --- Main ---
|
|
func main() {
|
|
poolFileName := mustEnv("NODE_POOL_FILE_NAME", "node-pool.yaml")
|
|
sshUser := mustEnv("NODE_SSH_USER", "ubuntu")
|
|
sshPass := mustEnv("NODE_SSH_PASS", "")
|
|
// read thresholds from environment
|
|
minCPU := mustIntEnv("MIN_CPU", 40)
|
|
minMem := mustIntEnv("MIN_MEM", 50)
|
|
maxCPU := mustIntEnv("MAX_CPU", 90)
|
|
maxMem := mustIntEnv("MAX_MEM", 90)
|
|
clusterName := mustEnv("CLUSTER_NAME", "cluster1")
|
|
desiredCP := mustIntEnv("DESIRED_CONTROLPLANES", 1)
|
|
// Kubernetes client
|
|
config, err := rest.InClusterConfig()
|
|
if err != nil {
|
|
log.Fatal("Cannot create in-cluster config:", err)
|
|
}
|
|
|
|
clientset, err := kubernetes.NewForConfig(config)
|
|
if err != nil {
|
|
log.Fatal("Cannot create clientset:", err)
|
|
}
|
|
|
|
metricsClient, err := metrics.NewForConfig(config)
|
|
if err != nil {
|
|
log.Fatal("Cannot create metrics client:", err)
|
|
}
|
|
|
|
// Web GUI
|
|
startWebGUI(poolFileName)
|
|
|
|
// Main control loop
|
|
for {
|
|
// Always load pool fresh from disk
|
|
pool, err := loadPool(poolFileName)
|
|
if err != nil {
|
|
log.Println("Cannot load node pool:", err)
|
|
time.Sleep(10 * time.Second)
|
|
continue
|
|
}
|
|
|
|
// Update ONLY nodes that exist in THIS cluster
|
|
err = updateNodePool(clientset, metricsClient, poolFileName, sshUser, sshPass)
|
|
if err != nil {
|
|
log.Printf("updateNodePool error: %v", err)
|
|
}
|
|
// Ensure control-plane count
|
|
ensureControlPlanes(clientset, poolFileName, sshUser, sshPass, clusterName, desiredCP)
|
|
|
|
// cluster utilization
|
|
cpuPct, memPct, err := clusterUtilization(clientset, metricsClient)
|
|
if err == nil {
|
|
log.Printf("Cluster utilization: CPU %d%%, MEM %d%%", cpuPct, memPct)
|
|
}
|
|
|
|
// decide worker activation based on thresholds
|
|
if cpuPct > maxCPU || memPct > maxMem {
|
|
activateOneWorker(clientset, pool, poolFileName, sshUser, sshPass, clusterName)
|
|
}
|
|
|
|
// decide worker deactivation based on thresholds
|
|
if cpuPct < minCPU && memPct < minMem {
|
|
deactivateOneWorkerSafe(clientset, pool, poolFileName, sshUser, sshPass, clusterName, 60)
|
|
}
|
|
|
|
time.Sleep(10 * time.Second)
|
|
}
|
|
}
|