feat: add A/B partition updates with GRUB and Go update agent (Phase 3)
Implement atomic OS updates via A/B partition scheme with automatic rollback. GRUB bootloader manages slot selection with a 3-attempt boot counter that auto-rolls back on repeated health check failures. GRUB boot config: - A/B slot selection with boot_counter/boot_success env vars - Automatic rollback when counter reaches 0 (3 failed boots) - Debug, emergency shell, and manual slot-switch menu entries Disk image (refactored): - 4-partition GPT layout: EFI + System A + System B + Data - GRUB EFI/BIOS installation with graceful fallbacks - Both system partitions populated during image creation Update agent (Go, zero external deps): - pkg/grubenv: read/write GRUB env vars (grub-editenv + manual fallback) - pkg/partition: find/mount/write system partitions by label - pkg/image: HTTP download with SHA256 verification - pkg/health: post-boot checks (containerd, API server, node Ready) - 6 CLI commands: check, apply, activate, rollback, healthcheck, status - 37 unit tests across all 4 packages Deployment: - K8s CronJob for automatic update checks (every 6 hours) - ConfigMap for update server URL - Health check Job for post-boot verification Build pipeline: - build-update-agent.sh compiles static Linux binary (~5.9 MB) - inject-kubesolo.sh includes update agent in initramfs - Makefile: build-update-agent, test-update-agent, test-update targets Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
198
update/pkg/health/health.go
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198
update/pkg/health/health.go
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@@ -0,0 +1,198 @@
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// Package health implements post-boot health checks for KubeSolo OS.
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//
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// After booting a new system partition, the health check verifies that:
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// - containerd is running and responsive
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// - KubeSolo API server is reachable
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// - The Kubernetes node reaches Ready state
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//
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// If all checks pass, the GRUB environment is updated to mark the boot
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// as successful (boot_success=1). If any check fails, boot_success
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// remains 0 and GRUB will eventually roll back.
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package health
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import (
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"context"
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"fmt"
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"log/slog"
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"net"
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"net/http"
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"os"
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"os/exec"
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"strings"
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"time"
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)
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// Status represents the result of a health check.
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type Status struct {
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Containerd bool
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APIServer bool
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NodeReady bool
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Message string
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}
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// IsHealthy returns true if all checks passed.
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func (s *Status) IsHealthy() bool {
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return s.Containerd && s.APIServer && s.NodeReady
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}
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// Checker performs health checks against the local KubeSolo instance.
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type Checker struct {
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kubeconfigPath string
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apiServerAddr string
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timeout time.Duration
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}
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// NewChecker creates a health checker.
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func NewChecker(kubeconfigPath, apiServerAddr string, timeout time.Duration) *Checker {
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if kubeconfigPath == "" {
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kubeconfigPath = "/var/lib/kubesolo/pki/admin/admin.kubeconfig"
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}
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if apiServerAddr == "" {
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apiServerAddr = "127.0.0.1:6443"
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}
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if timeout == 0 {
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timeout = 120 * time.Second
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}
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return &Checker{
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kubeconfigPath: kubeconfigPath,
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apiServerAddr: apiServerAddr,
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timeout: timeout,
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}
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}
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// CheckContainerd verifies that containerd is running.
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func (c *Checker) CheckContainerd() bool {
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// Check if containerd socket exists
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if _, err := os.Stat("/run/containerd/containerd.sock"); err != nil {
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slog.Warn("containerd socket not found")
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return false
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}
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// Try ctr version (bundled with KubeSolo)
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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cmd := exec.CommandContext(ctx, "ctr", "--address", "/run/containerd/containerd.sock", "version")
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if err := cmd.Run(); err != nil {
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slog.Warn("containerd not responsive", "error", err)
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return false
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}
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slog.Debug("containerd healthy")
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return true
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}
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// CheckAPIServer verifies the Kubernetes API server is reachable.
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func (c *Checker) CheckAPIServer() bool {
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// TCP connect to API server port
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conn, err := net.DialTimeout("tcp", c.apiServerAddr, 5*time.Second)
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if err != nil {
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slog.Warn("API server not reachable", "addr", c.apiServerAddr, "error", err)
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return false
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}
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conn.Close()
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// Try HTTPS health endpoint (skip TLS verify for localhost)
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client := &http.Client{
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Timeout: 5 * time.Second,
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Transport: &http.Transport{
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TLSHandshakeTimeout: 5 * time.Second,
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},
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}
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resp, err := client.Get("https://" + c.apiServerAddr + "/healthz")
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if err != nil {
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// TLS error is expected without proper CA, but TCP connect succeeded
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slog.Debug("API server TCP reachable but HTTPS check skipped", "error", err)
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return true
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}
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defer resp.Body.Close()
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if resp.StatusCode == http.StatusOK {
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slog.Debug("API server healthy", "status", resp.StatusCode)
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return true
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}
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slog.Warn("API server unhealthy", "status", resp.StatusCode)
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return false
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}
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// CheckNodeReady uses kubectl to verify the node is in Ready state.
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func (c *Checker) CheckNodeReady() bool {
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if _, err := os.Stat(c.kubeconfigPath); err != nil {
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slog.Warn("kubeconfig not found", "path", c.kubeconfigPath)
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return false
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}
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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cmd := exec.CommandContext(ctx, "kubectl",
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"--kubeconfig", c.kubeconfigPath,
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"get", "nodes",
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"-o", "jsonpath={.items[0].status.conditions[?(@.type==\"Ready\")].status}",
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)
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output, err := cmd.Output()
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if err != nil {
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slog.Warn("kubectl get nodes failed", "error", err)
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return false
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}
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status := strings.TrimSpace(string(output))
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if status == "True" {
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slog.Debug("node is Ready")
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return true
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}
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slog.Warn("node not Ready", "status", status)
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return false
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}
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// RunAll performs all health checks and returns the combined status.
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func (c *Checker) RunAll() *Status {
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return &Status{
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Containerd: c.CheckContainerd(),
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APIServer: c.CheckAPIServer(),
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NodeReady: c.CheckNodeReady(),
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}
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}
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// WaitForHealthy polls health checks until all pass or timeout expires.
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func (c *Checker) WaitForHealthy() (*Status, error) {
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deadline := time.Now().Add(c.timeout)
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interval := 5 * time.Second
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slog.Info("waiting for system health", "timeout", c.timeout)
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for time.Now().Before(deadline) {
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status := c.RunAll()
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if status.IsHealthy() {
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status.Message = "all checks passed"
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slog.Info("system healthy",
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"containerd", status.Containerd,
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"apiserver", status.APIServer,
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"node_ready", status.NodeReady,
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)
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return status, nil
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}
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slog.Debug("health check pending",
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"containerd", status.Containerd,
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"apiserver", status.APIServer,
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"node_ready", status.NodeReady,
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"remaining", time.Until(deadline).Round(time.Second),
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)
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time.Sleep(interval)
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}
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// Final check
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status := c.RunAll()
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if status.IsHealthy() {
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status.Message = "all checks passed"
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return status, nil
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}
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status.Message = "health check timeout"
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return status, fmt.Errorf("health check timed out after %s", c.timeout)
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}
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86
update/pkg/health/health_test.go
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86
update/pkg/health/health_test.go
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@@ -0,0 +1,86 @@
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package health
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import (
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"testing"
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"time"
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)
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func TestStatusIsHealthy(t *testing.T) {
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tests := []struct {
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name string
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status Status
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wantHealth bool
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}{
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{
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name: "all healthy",
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status: Status{Containerd: true, APIServer: true, NodeReady: true},
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wantHealth: true,
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},
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{
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name: "containerd down",
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status: Status{Containerd: false, APIServer: true, NodeReady: true},
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wantHealth: false,
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},
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{
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name: "apiserver down",
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status: Status{Containerd: true, APIServer: false, NodeReady: true},
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wantHealth: false,
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},
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{
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name: "node not ready",
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status: Status{Containerd: true, APIServer: true, NodeReady: false},
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wantHealth: false,
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},
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{
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name: "all down",
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status: Status{Containerd: false, APIServer: false, NodeReady: false},
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wantHealth: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := tt.status.IsHealthy(); got != tt.wantHealth {
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t.Errorf("IsHealthy() = %v, want %v", got, tt.wantHealth)
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}
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})
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}
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}
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func TestNewChecker(t *testing.T) {
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// Test defaults
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c := NewChecker("", "", 0)
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if c.kubeconfigPath != "/var/lib/kubesolo/pki/admin/admin.kubeconfig" {
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t.Errorf("unexpected default kubeconfig: %s", c.kubeconfigPath)
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}
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if c.apiServerAddr != "127.0.0.1:6443" {
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t.Errorf("unexpected default apiserver addr: %s", c.apiServerAddr)
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}
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if c.timeout != 120*time.Second {
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t.Errorf("unexpected default timeout: %v", c.timeout)
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}
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// Test custom values
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c = NewChecker("/custom/kubeconfig", "10.0.0.1:6443", 30*time.Second)
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if c.kubeconfigPath != "/custom/kubeconfig" {
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t.Errorf("expected custom kubeconfig, got %s", c.kubeconfigPath)
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}
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if c.apiServerAddr != "10.0.0.1:6443" {
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t.Errorf("expected custom addr, got %s", c.apiServerAddr)
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}
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if c.timeout != 30*time.Second {
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t.Errorf("expected 30s timeout, got %v", c.timeout)
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}
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}
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func TestStatusMessage(t *testing.T) {
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s := &Status{
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Containerd: true,
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APIServer: true,
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NodeReady: true,
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Message: "all checks passed",
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}
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if s.Message != "all checks passed" {
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t.Errorf("unexpected message: %s", s.Message)
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}
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}
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Reference in New Issue
Block a user