fix(install): backups exist on a default install; retention resolves real world dirs (#6)

Three faces of one gap, all on the supported install path:

- Backup/restore answered 503 out of the box: nothing ever rendered the
  archive PVC, so FELIS_BACKUP_PVC was unset. The bundle now renders the
  PVC (Minecraft namespace, RWO 10Gi, cluster default class) and
  'felis manifests' names it by default (--backup-pvc= is the explicit
  no-store shape); bootstrap passes it through so the generated felis.toml
  [archive] local_path and the jobs' mount path come from one variable.
- Retention was unreachable: bootstrap never passed the reaper flags. It
  now forwards FELIS_WORLDS_HOST_PATH/FELIS_ARCHIVE_LOCAL_PATH, so one
  env enables the daily CronJob; unset keeps today's fail-safe (no reaper,
  nothing deleted).
- Even when enabled it could not find a world on a stock install:
  resolveWorldDir now also resolves the exact local-path directory
  <pv-name>_<ns>_<pvc-name> read from the live PVC's volumeName (never a
  glob, so a stale deleted PV's bytes can't be archived in place of the
  current world). Reaper Role gains persistentvolumeclaims:get (weaker
  than the delete it already held).

README (zh/en) stops promising automatic/scheduled backups and states
retention is opt-in. bootstrap_test covers the env->flag contract.

README.md

@@ -17,8 +17,8 @@ A Kubernetes-driven Minecraft server hosting platform — one command to deploy,
 
 - **即开即玩**：玩家尝试连接时自动唤醒服务器，空闲后自动休眠，像游戏主机一样省资源。
 - **Web 控制面板**：浏览器中查看服务器状态、在线玩家与资源用量，管理备份与恢复。
-- **自动备份与恢复**：定时将世界打包存档，支持从任意备份点一键回滚。
+- **备份与恢复**：一键把世界打包进集群内的归档库，支持从任意备份点回滚；默认安装就已启用（归档 PVC 与路径由安装器一并生成）。
-- **智慧回收**：超过 15 天无人游玩的世界自动备份后删除，释放磁盘空间。
+- **智慧回收（可选开启）**：超过 15 天无人游玩的世界自动备份后删除，释放磁盘空间；安装时设置 `FELIS_WORLDS_HOST_PATH`（k3s 默认 `/var/lib/rancher/k3s/storage`）即启用每日回收，不设置则不删任何世界。
 - **多核心支持**：兼容 Paper、Fabric、Forge、NeoForge，经由 Velocity 代理统一入口。
 - **模组自助提交**：玩家自行上传模组包，服主审批通过后自动构建并部署。
 - **Passkey 登录**：支持指纹、面容、硬件密钥等无密码认证方式。

README_EN.md

@@ -17,8 +17,8 @@ Table of Contents
 
 - **Wake on Join**: Servers start automatically when a player connects, and stop when idle — like hibernate for your server.
 - **Web Dashboard**: Monitor server status, online players, and resource usage from your browser, with backup and restore management.
-- **Auto Backup & Restore**: Scheduled world backups with one-click rollback from any backup point.
+- **Backup & Restore**: One-click world snapshots into the cluster's archive store, with rollback from any backup point — enabled by default (the installer renders the archive PVC and its path).
-- **World Reaper**: Worlds idle for more than 15 days are automatically backed up and removed to free disk space.
+- **World Reaper** (opt in): Worlds idle for more than 15 days are automatically backed up and removed to free disk space. Enable it by setting `FELIS_WORLDS_HOST_PATH` at install time (on k3s: `/var/lib/rancher/k3s/storage`); without it, no world is ever deleted.
 - **Multi-core Support**: Compatible with Paper, Fabric, Forge, and NeoForge, federated behind a Velocity proxy.
 - **Modpack Submission**: Players submit custom modpacks; admin approval triggers automatic build and deployment.
 - **Passkey Login**: Passwordless authentication via fingerprint, face recognition, or hardware security keys.

cmd/felis/manifests.go

@@ -26,8 +26,10 @@ func (m *multiFlag) Set(v string) error {
 // felis-reaper identity only when the retention reaper is enabled, gated with
 // its CronJob), the weak build/restore Job SAs, the build/minecraft
 // NetworkPolicies, and the running control-plane workloads (felis-api/operator
-// Deployments + the in-cluster registry Deployment/Service/PVC) — as a single
+// Deployments + the in-cluster registry Deployment/Service/PVC + the
-// multi-document YAML stream on stdout, ready for `kubectl apply -f -`.
+// world-archive PVC that backs backup/restore, unless --backup-pvc is emptied)
+// — as a single multi-document YAML stream on stdout, ready for
+// `kubectl apply -f -`.
 //
 // It is a pure renderer: it never contacts a cluster and holds no credentials.
 // --velocity-cidr records the proxy host addresses allowed by the game NetworkPolicy.
@@ -44,8 +46,8 @@ func cmdManifests(args []string, stdout, stderr io.Writer) int {
 	panelNodePort := fs.Int("panel-node-port", int(platform.DefaultPanelNodePort), "NodePort that exposes the built-in HTTPS panel/API origin")
 	felisImage := fs.String("felis-image", "", "container image the felis-api/operator Deployments run, also passed through as FELIS_IMAGE (REQUIRED)")
 	registryImage := fs.String("registry-image", "", "in-cluster registry image (default: registry:2)")
-	backupPVC := fs.String("backup-pvc", "", "name of the backup PVC advertised to the restore executor via FELIS_BACKUP_PVC (default none = restore endpoint returns 503)")
+	backupPVC := fs.String("backup-pvc", "felis-backups", "name of the world-archive PVC this bundle renders in the Minecraft namespace and advertises to the backup/restore executors via FELIS_BACKUP_PVC (default: felis-backups; pass an empty value to render none, leaving backup/restore answering 503)")
-	worldsHostPath := fs.String("worlds-host-path", "", "node directory under which each world PVC is visible as <path>/<pvc>; enables the reaper CronJob (requires --backup-pvc and --archive-local-path)")
+	worldsHostPath := fs.String("worlds-host-path", "", "node directory the reaper reads worlds from: each world PVC resolves as <path>/<pvc>, or as the stock local-path directory <path>/<pv-name>_<ns>_<pvc-name> (k3s storage root: /var/lib/rancher/k3s/storage); enables the reaper CronJob (requires --archive-local-path and a non-empty --backup-pvc)")
 	archiveLocalPath := fs.String("archive-local-path", "", "path the backup PVC is mounted at in the reaper CronJob; MUST equal felis.toml [archive] local_path")
 	var velocityCIDRs multiFlag
 	fs.Var(&velocityCIDRs, "velocity-cidr", "CIDR of a Velocity proxy host allowed to reach game port 25565 (repeatable, REQUIRED)")
@@ -82,17 +84,20 @@ func cmdManifests(args []string, stdout, stderr io.Writer) int {
 		return 2
 	}
 
-	// Retention/reaper rendering is opt-in and needs all three storage coordinates
+	// Retention/reaper rendering is opt-in and needs a storage topology together:
-	// together: where worlds live (to read+archive them), the backup PVC (to write
+	// where worlds live (to read+archive them), a backup PVC (to write archives
-	// archives into), and the path it is mounted at (which MUST equal felis.toml
+	// into — rendered from --backup-pvc), and the path it is mounted at (which MUST
-	// [archive] local_path so tarLocal's absolute archive refs resolve). A partial
+	// equal felis.toml [archive] local_path so tarLocal's absolute archive refs
-	// configuration is almost certainly an operator mistake, so fail loud rather than
+	// resolve). A partial configuration is almost certainly an operator mistake, so
-	// silently drop retention. Asking for it without the other two is rejected; an
+	// fail loud rather than silently drop retention or render a reaper with nowhere
-	// empty trio renders the bundle WITHOUT the reaper and says so.
+	// to write. The backup PVC itself defaults to felis-backups (it is what makes a
+	// default install's backup endpoint work at all); retention additionally needs
+	// --worlds-host-path.
 	if *worldsHostPath != "" {
 		if *backupPVC == "" || *archiveLocalPath == "" {
 			fmt.Fprintln(stderr, "felis manifests: --worlds-host-path enables the reaper CronJob and requires "+
-				"--backup-pvc and --archive-local-path too (--archive-local-path must equal felis.toml [archive] local_path)")
+				"--archive-local-path (must equal felis.toml [archive] local_path) and a non-empty --backup-pvc "+
+				"(the archive store; default felis-backups)")
 			return 2
 		}
 		// The reaper WILL render. Two deployment preconditions this generator cannot
@@ -102,15 +107,16 @@ func cmdManifests(args []string, stdout, stderr io.Writer) int {
 		// flag/field docs, but nobody deploying from stdout reads those.)
 		fmt.Fprintf(stderr, "felis manifests: note: rendering the retention reaper CronJob (worlds hostPath %q). "+
 			"Two preconditions are NOT verified here:\n"+
-			"  - each world PVC must be visible at %s/<pvc> on the node: a stock local-path-provisioner lays "+
+			"  - the node's world volumes must actually live below %s: the reaper resolves a world as "+
-			"volumes under PV-name paths (.../pvc-<uuid>_<ns>_<pvc>/), so unless the worlds StorageClass is "+
+			"%s/<pvc>, then as the stock local-path directory <path>/<pv-name>_<ns>_<pvc-name> (what k3s "+
-			"arranged to expose <path>/<pvc>, the reaper tars an empty directory;\n"+
+			"writes under /var/lib/rancher/k3s/storage). Any other provisioner needs its volumes exposed as "+
+			"<path>/<pvc>, or each candidate's archive fails and the world is preserved;\n"+
 			"  - the CronJob sets NO nodeSelector: a single-node starter pins it to the worlds implicitly, but "+
 			"on a multi-node cluster you MUST add a nodeSelector for the node holding the worlds, or the reaper "+
-			"may schedule where the hostPath is empty.\n", *worldsHostPath, *worldsHostPath)
+			"may schedule where the hostPath is empty.\n", *worldsHostPath, *worldsHostPath, *worldsHostPath)
 	} else {
 		fmt.Fprintln(stderr, "felis manifests: note: retention reaper CronJob not rendered "+
-			"(pass --worlds-host-path, --backup-pvc and --archive-local-path to enable it)")
+			"(pass --worlds-host-path and --archive-local-path — the archive PVC defaults to felis-backups — to enable it)")
 	}
 
 	out, err := platform.RenderYAML(platform.Params{

cmd/felis/manifests_test.go

@@ -77,6 +77,10 @@ func TestManifestsRendersBundle(t *testing.T) {
 		"10.0.0.5/32",
 		// The felis image flows through to the Deployments.
 		"registry.felis.svc:5000/felis:v1",
+		// Backup works out of the box: the archive PVC renders and the api gets
+		// the env that wires the backup/restore executors to it.
+		"name: felis-backups",
+		"name: FELIS_BACKUP_PVC",
 	} {
 		if !strings.Contains(text, want) {
 			t.Errorf("rendered bundle missing %q", want)
@@ -95,15 +99,19 @@ func TestManifestsRendersBundle(t *testing.T) {
 	}
 }
 
-// TestManifestsReaperRequiresTrio proves --worlds-host-path is a fail-loud opt-in:
+// TestManifestsReaperRequiresStorage proves --worlds-host-path is a fail-loud
-// asking for the reaper without the backup PVC and its mount path (which must equal
+// opt-in: asking for the reaper without a writable archive store (the backup PVC,
-// [archive] local_path) is rejected rather than silently dropping retention.
+// which defaults to felis-backups but can be emptied) and its mount path (which
-func TestManifestsReaperRequiresTrio(t *testing.T) {
+// must equal [archive] local_path) is rejected rather than silently dropping
+// retention or deleting worlds it could not archive first.
+func TestManifestsReaperRequiresStorage(t *testing.T) {
 	base := []string{"manifests", "--felis-image", "reg/felis:test", "--velocity-cidr", "10.0.0.5/32", "--worlds-host-path", "/var/lib/felis/worlds"}
 	for _, extra := range [][]string{
-		{},                                   // neither backup-pvc nor archive-local-path
+		{},                        // missing archive-local-path (backup-pvc defaults)
-		{"--backup-pvc", "felis-backups"},    // missing archive-local-path
+		{"--backup-pvc", "other"}, // still missing archive-local-path
-		{"--archive-local-path", "/backups"}, // missing backup-pvc
+		// A reaper with no archive store would have nowhere to write the archive
+		// it must verify before deleting a world; emptying the PVC is rejected.
+		{"--archive-local-path", "/backups", "--backup-pvc="},
 	} {
 		var out, errBuf bytes.Buffer
 		code := run(append(append([]string{}, base...), extra...), &out, &errBuf)
@@ -119,6 +127,23 @@ func TestManifestsReaperRequiresTrio(t *testing.T) {
 	}
 }
 
+// TestManifestsBackupPVCOptOut proves --backup-pvc= renders a bundle with no
+// archive store at all: no PVC and no FELIS_BACKUP_PVC env, so backup/restore
+// answer 503 instead of pointing Jobs at a claim nobody provisions.
+func TestManifestsBackupPVCOptOut(t *testing.T) {
+	var out, errBuf bytes.Buffer
+	code := run([]string{"manifests", "--felis-image", "reg/felis:test",
+		"--velocity-cidr", "10.0.0.5/32", "--backup-pvc="}, &out, &errBuf)
+	if code != 0 {
+		t.Fatalf("exit code = %d, want 0; stderr=%q", code, errBuf.String())
+	}
+	for _, absent := range []string{"felis-backups", "FELIS_BACKUP_PVC"} {
+		if strings.Contains(out.String(), absent) {
+			t.Errorf("--backup-pvc= bundle must not contain %q", absent)
+		}
+	}
+}
+
 // TestManifestsRendersReaper proves the happy path with the full retention trio:
 // a batch/v1 CronJob is emitted, named felis-reaper, mounting the backup PVC at the
 // supplied archive path.
@@ -150,7 +175,7 @@ func TestManifestsRendersReaper(t *testing.T) {
 	// this generator cannot verify (else a misarranged hostPath silently no-ops
 	// retention): the <path>/<pvc> arrangement-dependency and the multi-node
 	// nodeSelector hazard.
-	for _, want := range []string{"local-path-provisioner", "nodeSelector"} {
+	for _, want := range []string{"local-path", "nodeSelector"} {
 		if !strings.Contains(errBuf.String(), want) {
 			t.Errorf("reaper render must warn operators about %q on stderr, got %q", want, errBuf.String())
 		}

cmd/felis/reaper.go

@@ -1,9 +1,11 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"io"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -14,6 +16,7 @@ import (
 	"felis.lolicon.best/internal/config"
 	"felis.lolicon.best/internal/reaper"
 	"felis.lolicon.best/internal/store"
+	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
@@ -30,7 +33,7 @@ func cmdReaper(args []string, stdout, stderr io.Writer) int {
 	fs := flag.NewFlagSet("reaper", flag.ContinueOnError)
 	fs.SetOutput(stderr)
 	cfgPath := fs.String("config", "/etc/felis/felis.toml", "path to felis.toml")
-	worldsRoot := fs.String("worlds-root", "/worlds", "mount root under which world PVCs are visible (tarLocal: <root>/<pvc>)")
+	worldsRoot := fs.String("worlds-root", "/worlds", "mount root under which world PVCs are visible (tarLocal: <root>/<pvc>, else the stock local-path <root>/<pv-name>_<ns>_<pvc-name>)")
 	if err := fs.Parse(args); err != nil {
 		return 2
 	}
@@ -47,21 +50,8 @@ func cmdReaper(args []string, stdout, stderr io.Writer) int {
 		return 1
 	}
 
-	archiver, err := buildArchiver(cfg, *worldsRoot)
-	if err != nil {
-		fmt.Fprintf(stderr, "felis reaper: %v\n", err)
-		return 1
-	}
-
 	ctx := ctrl.SetupSignalHandler()
 
-	drv, err := store.Open(ctx, cfg.Database.URL)
-	if err != nil {
-		fmt.Fprintf(stderr, "felis reaper: open database: %v\n", err)
-		return 1
-	}
-	defer drv.Close()
-
 	scheme := runtime.NewScheme()
 	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
 	utilruntime.Must(v1alpha1.AddToScheme(scheme))
@@ -71,6 +61,19 @@ func cmdReaper(args []string, stdout, stderr io.Writer) int {
 		return 1
 	}
 
+	archiver, err := buildArchiver(ctx, cfg, *worldsRoot, cl)
+	if err != nil {
+		fmt.Fprintf(stderr, "felis reaper: %v\n", err)
+		return 1
+	}
+
+	drv, err := store.Open(ctx, cfg.Database.URL)
+	if err != nil {
+		fmt.Fprintf(stderr, "felis reaper: open database: %v\n", err)
+		return 1
+	}
+	defer drv.Close()
+
 	r := &reaper.Reaper{
 		Cfg:      rcfg,
 		Store:    reaper.NewPGStore(drv.DB()),
@@ -122,22 +125,57 @@ func reaperConfig(cfg *config.Config) (reaper.Config, error) {
 }
 
 // buildArchiver constructs the WorldArchiver. Only tarLocal is implemented in
-// this build; the resolver maps each world PVC to <worldsRoot>/<pvc>, the mount
+// this build; the resolver maps each world PVC to its directory under worldsRoot
-// convention the reaper Job is deployed with.
+// (resolveWorldDir).
-func buildArchiver(cfg *config.Config, worldsRoot string) (backup.WorldArchiver, error) {
+func buildArchiver(ctx context.Context, cfg *config.Config, worldsRoot string, cl client.Client) (backup.WorldArchiver, error) {
 	switch cfg.Archive.Store {
 	case "tarLocal":
 		return &backup.TarLocal{
 			BackupRoot: cfg.Archive.LocalPath,
-			Resolve: func(pvc string) (string, error) {
+			Resolve:    resolveWorldDir(ctx, cl, cfg.K8s.Namespace, worldsRoot),
-				return filepath.Join(worldsRoot, pvc), nil
-			},
 		}, nil
 	default:
 		return nil, fmt.Errorf("[archive] store %q is not implemented in this build (only tarLocal)", cfg.Archive.Store)
 	}
 }
 
+// resolveWorldDir maps a world PVC to its directory under worldsRoot, supporting
+// the two layouts a Felis host actually has:
+//
+//  1. <root>/<pvc> — the reaper's documented arrangement (worlds exposed by PVC
+//     name, e.g. via mounting each volume or a crafted storage class).
+//  2. <root>/<pv-name>_<namespace>_<pvc-name> — what a stock k3s install gets:
+//     local-path-provisioner stores every volume under its storage root as that
+//     exact directory name. Without this arm, retention on a default install could
+//     only ever fail to find a world (a no-op reaper, or worse an operator
+//     arranging paths by hand).
+//
+// The second path is derived EXACTLY from the live PVC's spec.volumeName, never
+// from a glob: a leftover directory of an old, deleted PV must never be mistaken
+// for the world the PVC currently binds, because the reaper archives the resolved
+// directory and then deletes that PVC — archiving stale bytes and deleting the
+// real world would be data loss. When neither path exists the first is returned,
+// so the archive walk fails loudly against the documented path.
+func resolveWorldDir(ctx context.Context, cl client.Client, namespace, worldsRoot string) backup.PVCResolver {
+	return func(pvc string) (string, error) {
+		direct := filepath.Join(worldsRoot, pvc)
+		if _, err := os.Stat(direct); err == nil {
+			return direct, nil
+		}
+		var claim corev1.PersistentVolumeClaim
+		if err := cl.Get(ctx, client.ObjectKey{Namespace: namespace, Name: pvc}, &claim); err != nil {
+			return "", fmt.Errorf("resolve world PVC %s: %w", pvc, err)
+		}
+		if pv := claim.Spec.VolumeName; pv != "" {
+			volDir := filepath.Join(worldsRoot, fmt.Sprintf("%s_%s_%s", pv, claim.Namespace, claim.Name))
+			if _, err := os.Stat(volDir); err == nil {
+				return volDir, nil
+			}
+		}
+		return direct, nil
+	}
+}
+
 // parseSpanDuration parses the human spans used in felis.toml's [archive] table:
 // "3mo" (months≈30d), "15d" (days), or any time.ParseDuration unit ("12h").
 func parseSpanDuration(s string) (time.Duration, error) {

cmd/felis/reaper_test.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+)
+
+// TestResolveWorldDir pins the two world layouts the reaper must find, and the
+// fail-closed miss. The stock local-path arm is derived from the live PVC's
+// volumeName — a name-based guess (glob) could tar a stale deleted PV's bytes and
+// then delete the current world, which is why it is read from the API instead.
+func TestResolveWorldDir(t *testing.T) {
+	ctx := context.Background()
+	root := t.TempDir()
+
+	// Arrange a world under the documented <root>/<pvc> layout.
+	named := filepath.Join(root, "world-named-0")
+	if err := os.MkdirAll(named, 0o750); err != nil {
+		t.Fatal(err)
+	}
+	// Arrange a second world the way k3s local-path stores it.
+	pvDir := filepath.Join(root, "pvc-11111111-2222-3333-4444-555555555555_minecraft_world-live-0")
+	if err := os.MkdirAll(pvDir, 0o750); err != nil {
+		t.Fatal(err)
+	}
+
+	claim := &corev1.PersistentVolumeClaim{
+		ObjectMeta: metav1.ObjectMeta{Name: "world-live-0", Namespace: "minecraft"},
+		Spec: corev1.PersistentVolumeClaimSpec{
+			VolumeName: "pvc-11111111-2222-3333-4444-555555555555",
+		},
+	}
+	cl := fake.NewClientBuilder().WithScheme(haltScheme(t)).WithObjects(claim).Build()
+	resolve := resolveWorldDir(ctx, cl, "minecraft", root)
+
+	t.Run("documented name layout wins", func(t *testing.T) {
+		got, err := resolve("world-named-0")
+		if err != nil || got != named {
+			t.Fatalf("resolve = (%q, %v), want (%q, nil)", got, err, named)
+		}
+	})
+
+	t.Run("stock local-path layout resolves exactly", func(t *testing.T) {
+		got, err := resolve("world-live-0")
+		if err != nil || got != pvDir {
+			t.Fatalf("resolve = (%q, %v), want (%q, nil)", got, err, pvDir)
+		}
+	})
+
+	t.Run("neither layout present falls back to the documented path", func(t *testing.T) {
+		// The claim exists but its directory does not: return the documented path so
+		// the archive walk fails there, and the reaper preserves the world.
+		missing := &corev1.PersistentVolumeClaim{
+			ObjectMeta: metav1.ObjectMeta{Name: "world-gone-0", Namespace: "minecraft"},
+			Spec:       corev1.PersistentVolumeClaimSpec{VolumeName: "pvc-99999999-0000-0000-0000-000000000000"},
+		}
+		cl := fake.NewClientBuilder().WithScheme(haltScheme(t)).WithObjects(missing).Build()
+		got, err := resolveWorldDir(ctx, cl, "minecraft", root)("world-gone-0")
+		if err != nil || got != filepath.Join(root, "world-gone-0") {
+			t.Fatalf("resolve = (%q, %v), want (%q, nil)", got, err, filepath.Join(root, "world-gone-0"))
+		}
+	})
+
+	t.Run("unknown pvc is an error, not a guess", func(t *testing.T) {
+		_, err := resolve("world-unknown-0")
+		if err == nil || !strings.Contains(err.Error(), "resolve world PVC world-unknown-0") {
+			t.Fatalf("err = %v, want a resolve-world-PVC error", err)
+		}
+	})
+}

deploy/bootstrap.sh

@@ -63,6 +63,15 @@
 #   FELIS_ROOT_DOMAIN deployment root domain  (default: <node-ip>.nip.io)
 #   FELIS_PANEL_NODEPORT local HTTPS panel/API NodePort (default: 30443)
 #   FELIS_EGRESS_MODE loadbalancer|nodeport   (default: nodeport — no MetalLB on a demo box)
+#   FELIS_BACKUP_PVC  world-archive PVC the installer renders and felis-api hands to its
+#                     backup/restore Jobs (default: felis-backups; empty string disables
+#                     backups — the endpoints answer 503)
+#   FELIS_ARCHIVE_LOCAL_PATH path that PVC is mounted at inside those Jobs; written into
+#                     felis.toml [archive] local_path (default: /var/lib/felis/archives)
+#   FELIS_WORLDS_HOST_PATH node directory holding the world volumes (on the k3s this
+#                     installer provisions: /var/lib/rancher/k3s/storage). Setting it
+#                     enables the daily retention reaper, which archives and then deletes
+#                     worlds idle beyond the retention window (default: unset = no reaper)
 #   PKG_LOCK_TIMEOUT seconds to wait for package-manager locks (default: 900)
 #   APT_LOCK_TIMEOUT legacy alias for PKG_LOCK_TIMEOUT
 set -Eeuo pipefail
@@ -106,6 +115,18 @@ FELIS_VERSION_BASE=""
 FELIS_IMAGE="${FELIS_IMAGE:-felis:demo}"
 FELIS_EGRESS_MODE="${FELIS_EGRESS_MODE:-nodeport}"
 FELIS_PANEL_NODEPORT="${FELIS_PANEL_NODEPORT:-30443}"
+# World-archive storage. The installer renders this PVC (minecraft namespace) and felis-api
+# advertises it to its backup/restore Jobs; emptying it disables backups (503). The archive
+# path is written into felis.toml so the Jobs' mount and [archive] local_path agree by
+# construction — a mismatch would leave tarLocal's absolute archive refs unresolvable.
+FELIS_BACKUP_PVC="${FELIS_BACKUP_PVC:-felis-backups}"
+FELIS_ARCHIVE_LOCAL_PATH="${FELIS_ARCHIVE_LOCAL_PATH:-/var/lib/felis/archives}"
+# Retention is opt-in because it DELETES worlds (after a verified archive): point this at the
+# node directory the world volumes live under. On the k3s this installer provisions that is
+# /var/lib/rancher/k3s/storage — the reaper resolves each PVC's local-path directory exactly
+# from its volumeName. Left unset, no reaper CronJob renders and archives accumulate until
+# the backup PVC fills (then backups fail loudly; nothing is deleted).
+FELIS_WORLDS_HOST_PATH="${FELIS_WORLDS_HOST_PATH:-}"
 INSTALL_MODE="${FELIS_INSTALL_MODE:-}"
 # Loopback by default: hasJoined is an unauthenticated endpoint by protocol (Velocity
 # sends no token), so a public bind is a free auth relay — anyone can point their own
@@ -2047,7 +2068,7 @@ build_namespace = "${BUILD_NS}"
 
 [archive]
 store = "tarLocal"
-local_path = "/var/lib/felis/archives"
+local_path = "${FELIS_ARCHIVE_LOCAL_PATH}"
 
 [auth]
 admin_hostname = "op.console.${FELIS_ROOT_DOMAIN}"
@@ -2137,11 +2158,26 @@ deploy_bundle() {
     --dry-run=client -o yaml | kube apply -f -
 
   log "rendering + applying the control-plane bundle"
-  "$HOST_BIN" manifests \
+  local -a manifest_args=(
-    --felis-image "$FELIS_IMAGE" \
+    --felis-image "$FELIS_IMAGE"
-    --panel-node-port "$FELIS_PANEL_NODEPORT" \
+    --panel-node-port "$FELIS_PANEL_NODEPORT"
-    --velocity-cidr "${NODE_IP}/32" \
+    --velocity-cidr "${NODE_IP}/32"
-    | kube apply -f -
+  )
+  # Backups are on by default (the renderer's own default names felis-backups); an emptied
+  # FELIS_BACKUP_PVC asks for the no-backup shape explicitly, and a custom name must be
+  # passed through or the api would advertise a PVC the bundle never created.
+  if [ -n "$FELIS_BACKUP_PVC" ]; then
+    manifest_args+=(--backup-pvc "$FELIS_BACKUP_PVC")
+  else
+    manifest_args+=(--backup-pvc=)
+  fi
+  # Retention renders only when the operator names where the worlds live; the archive path
+  # always travels with it because it must equal the [archive] local_path written above.
+  if [ -n "$FELIS_WORLDS_HOST_PATH" ]; then
+    log "retention enabled: the daily reaper will read worlds from ${FELIS_WORLDS_HOST_PATH}"
+    manifest_args+=(--worlds-host-path "$FELIS_WORLDS_HOST_PATH" --archive-local-path "$FELIS_ARCHIVE_LOCAL_PATH")
+  fi
+  "$HOST_BIN" manifests "${manifest_args[@]}" | kube apply -f -
   restart_existing_control_plane "$had_api" "$had_operator"
 
   log "waiting for control-plane rollouts"

deploy/bootstrap_test.sh

@@ -574,6 +574,45 @@ mkdir -p "$sdir/src/.git"
 expect "a failed fetch into an existing checkout names the token" "set FELIS_GITHUB_TOKEN" \
   "$(run_fetch "$sdir/src")"
 
+# --- default install keeps backups, and retention envs reach the renderer ----------------
+# A default install must render the world-archive PVC (without one, backup/restore answer an
+# honest 503), and FELIS_WORLDS_HOST_PATH must turn into the reaper's two flags or an
+# operator's retention enablement silently renders no CronJob. Extracted, not retyped.
+
+mblock="$(awk '/^  local -a manifest_args=\(/,/kube apply -f -/' "$BS")"
+[ -n "$mblock" ] || { echo "FAIL: no manifest_args block found in $BS"; exit 1; }
+[ "$(printf '%s\n' "$mblock" | wc -l)" -lt 30 ] \
+  || { echo "FAIL: the extracted block is not the manifest_args block -- did it move?"; exit 1; }
+
+run_bundle_flags() { # backup-pvc worlds-host-path
+  FELIS_IMAGE=reg/felis:test FELIS_PANEL_NODEPORT=30443 NODE_IP=10.0.0.5 \
+  FELIS_BACKUP_PVC="$1" FELIS_WORLDS_HOST_PATH="$2" FELIS_ARCHIVE_LOCAL_PATH=/var/lib/felis/archives \
+  HOST_BIN=myManifests bash -c '
+    log() { :; }
+    kube() { cat; }
+    myManifests() { printf "%s\n" "$@"; }
+    run_bundle() {
+    '"$mblock"'
+    }
+    run_bundle'
+}
+
+out="$(run_bundle_flags felis-backups '')"
+expect "a default install asks the renderer for the archive PVC" "--backup-pvc
+felis-backups" "$out"
+case "$out" in
+  *--worlds-host-path*) echo "FAIL: no reaper flags may render without FELIS_WORLDS_HOST_PATH"; fails=$((fails + 1)) ;;
+esac
+
+out="$(run_bundle_flags '' '')"
+expect "an emptied FELIS_BACKUP_PVC is the explicit no-backup shape" "--backup-pvc=" "$out"
+
+out="$(run_bundle_flags felis-backups /var/lib/rancher/k3s/storage)"
+expect "enabling retention passes the worlds root" "--worlds-host-path
+/var/lib/rancher/k3s/storage" "$out"
+expect "enabling retention passes the archive mount that must match felis.toml" "--archive-local-path
+/var/lib/felis/archives" "$out"
+
 # ---------------------------------------------------------------------------------------
 if [ "$fails" -eq 0 ]; then
   echo "ALL PASS"

internal/platform/bundle.go

@@ -32,7 +32,9 @@ type Object interface {
 // Scope: this is the authorization + network fence (spec §21, §22) plus the
 // running control-plane workloads it fences — the felis-api / felis-operator
 // Deployments and the in-cluster registry (Deployment + Service + PVC), which
-// make the SAs and NetworkPolicy peers refer to something real (see workloads.go).
+// make the SAs and NetworkPolicy peers refer to something real, plus the
+// world-archive PVC that backs backup/restore when a backup PVC is named (see
+// workloads.go).
 // The reaper CronJob is also part of Workloads, rendered only when the retention
 // storage topology is supplied (WorldsHostPath + BackupPVC + ArchiveLocalPath —
 // workloads.go documents the gate and the shape-asserted hostPath caveat). The

internal/platform/identities.go

@@ -107,14 +107,16 @@ type Params struct {
 	FelisImage string
 	// RegistryImage is the in-cluster registry image. Defaults to registry:2.
 	RegistryImage string
-	// BackupPVC is the name of the backup PersistentVolumeClaim the felis-api pod
+	// BackupPVC is the name of the world-archive PersistentVolumeClaim. The bundle
-	// advertises to its restore executor via FELIS_BACKUP_PVC. It is OPTIONAL: with
+	// RENDERS this PVC (backupPVC in workloads.go, Minecraft namespace — where every
-	// no backup PVC the restore endpoint degrades to 503 (cmd/felis/api.go), so the
+	// pod that mounts it runs) and felis-api advertises the name to its backup/restore
-	// env var is rendered only when this is set. It must name the same PVC that the
+	// executors via FELIS_BACKUP_PVC. An empty name renders neither: no PVC, no env,
-	// felis.toml archive.local_path is the mount path for, but that agreement lives
+	// and the backup/restore endpoints degrade to 503 (cmd/felis/api.go) rather than
-	// in the out-of-band config Secret and cannot be enforced by the manifest. The
+	// enqueuing a Job that cannot mount its backup. The PVC name itself carries no
-	// reaper CronJob (when rendered) mounts this same PVC read-write to write
+	// path meaning; the in-pod mount path is felis.toml's [archive] local_path (the
-	// archives into it — see WorldsHostPath / ArchiveLocalPath.
+	// Jobs mount the PVC there, and tarLocal writes archive refs as absolute paths
+	// under it). The reaper CronJob (when rendered) mounts this same PVC read-write
+	// to write archives into it — see WorldsHostPath / ArchiveLocalPath.
 	BackupPVC string
 	// WorldsHostPath is the node directory under which each server's world PVC is
 	// visible as <WorldsHostPath>/<pvc> — the on-disk root the reaper CronJob mounts
@@ -128,12 +130,18 @@ type Params struct {
 	// a later storage evolution. Setting it REQUIRES BackupPVC and ArchiveLocalPath
 	// too — `felis manifests` enforces the trio (fail-loud).
 	//
-	// SHAPE-ASSERTED, runtime-unverified, and ARRANGEMENT-DEPENDENT: the reaper's
+	// ARRANGEMENT: the reaper's resolver (cmd/felis/reaper.resolveWorldDir) looks
-	// resolver looks for <root>/<pvc>. Stock local-path-provisioner lays volumes out
+	// for <root>/<pvc> first and then for the stock local-path-provisioner layout
-	// under PV-name paths (…/pvc-<uuid>_<ns>_<pvc>/), NOT <root>/<pvc>, so this mount
+	// <root>/<pv-name>_<ns>_<pvc-name> — the exact directory name k3s uses under
-	// only finds worlds if the operator/storage is deliberately arranged to expose
+	// its storage root (/var/lib/rancher/k3s/storage), derived from the live PVC's
-	// them as <root>/<pvc>. The rendered CronJob is the correct K8s object; whether
+	// spec.volumeName. So pointing this at the k3s storage root is the supported
-	// the tar finds a world on a given cluster is not provable without one.
+	// way to enable retention on a stock install; other provisioners work if they
+	// expose volumes as <root>/<pvc> or are read through the same PVC. On a
+	// multi-node cluster every node HAS the root directory, but a world's directory
+	// only exists on the node holding its volume: the CronJob schedules anywhere,
+	// so a world found nowhere on that node fails the archive and is preserved.
+	// The rendered CronJob is the correct K8s object; the actual tar depends on the
+	// hosting node, which is not provable without a cluster.
 	WorldsHostPath string
 	// ArchiveLocalPath is the path the backup PVC is mounted at inside the reaper
 	// CronJob's pod, and MUST equal felis.toml's [archive] local_path. tarLocal writes

internal/platform/rbac.go

@@ -162,6 +162,11 @@ func OperatorRole(p Params) *rbacv1.Role {
 // minecraftservers but cannot create them, and holds no power over StatefulSets,
 // Services, or Secrets — those belong to the operator and api.
 //
+// persistentvolumeclaims also carries get: resolving where a world lives
+// (cmd/felis/reaper.resolveWorldDir) reads the PVC's volumeName to derive the
+// stock local-path directory name. get is strictly weaker than the delete the
+// same rule already grants, so it widens nothing.
+//
 // Note no identity anywhere holds minecraftservers:delete. That is intentional, not
 // a missing grant: reaping releases a server by flipping desiredState=Stopped and
 // reclaiming the world PVC (k8scluster.go does "nothing else"), leaving the CR in
@@ -172,7 +177,7 @@ func ReaperRole(p Params) *rbacv1.Role {
 	p = p.withDefaults()
 	return role(p.MinecraftNamespace, "felis-reaper", ComponentReaper, []rbacv1.PolicyRule{
 		rule([]string{groupFelis}, []string{"minecraftservers"}, []string{"get", "patch"}),
-		rule([]string{groupCore}, []string{"persistentvolumeclaims"}, []string{"delete"}),
+		rule([]string{groupCore}, []string{"persistentvolumeclaims"}, []string{"get", "delete"}),
 	})
 }
 

internal/platform/rbac_test.go

@@ -183,8 +183,8 @@ func TestOperatorRole_ScopeExact(t *testing.T) {
 func TestReaperRole_ScopeExact(t *testing.T) {
 	rp := roleByName(t, ControlPlaneRBAC(reaperParams()).Roles, "felis-reaper")
 
-	if !hasRule(rp, groupCore, "persistentvolumeclaims", "delete") {
+	if !hasRule(rp, groupCore, "persistentvolumeclaims", "delete") || !hasRule(rp, groupCore, "persistentvolumeclaims", "get") {
-		t.Error("reaper must delete PVCs (world reclamation)")
+		t.Error("reaper must get (resolve the volume) and delete (reclaim) PVCs")
 	}
 	if !hasRule(rp, groupFelis, "minecraftservers", "patch") || !hasRule(rp, groupFelis, "minecraftservers", "get") {
 		t.Error("reaper must get+patch minecraftservers (to Stop them)")

internal/platform/workloads.go

@@ -32,12 +32,14 @@ import (
 // read-only — is the only one coherent with the operator's per-server
 // ReadWriteOnce world PVCs (a shared RWX worlds mount would contradict them), so
 // that is what renders; when the trio is absent no CronJob is emitted, which is
-// the fail-safe choice for a workload that deletes PVCs. SHAPE-ASSERTED and
+// the fail-safe choice for a workload that deletes PVCs. The reaper resolver
-// runtime-unverified: the rendered CronJob is the correct K8s object, but whether
+// (cmd/felis/reaper.resolveWorldDir) finds worlds either as <WorldsHostPath>/<pvc>
-// the tar finds a world under <WorldsHostPath>/<pvc> on a given cluster depends on
+// or in the stock local-path layout k3s writes under its storage root
-// how that node's storage is arranged (stock local-path-provisioner uses
+// (<pv-name>_<ns>_<pvc-name>, read from the live PVC), so pointing
-// PV-name paths, not <root>/<pvc>) and is not provable without a cluster — see the
+// --worlds-host-path at /var/lib/rancher/k3s/storage works on a default install —
-// WorldsHostPath field doc. No nodeSelector is set: the single-node starter pins
+// see the WorldsHostPath field doc. Whether the tar finds a world still depends on
+// the hosting node, and is not provable without a cluster. No nodeSelector is set:
+// the single-node starter pins
 // the worlds to one node implicitly; a multi-node deployment MUST add one (or the
 // CronJob could schedule on a node where the hostPath is empty) — a hazard left on
 // record here until multi-node retention is built.
@@ -86,6 +88,13 @@ const (
 	// local-storage install (no such Secret) still starts.
 	uploadsPVCName     = "felis-uploads"
 	uploadsStorageSize = "5Gi"
+	// backupStorageSize is the world-archive store's default capacity. It is a
+	// starter-sized floor (registry 10Gi, uploads 5Gi sit beside it): archives are
+	// compressed worlds and a fresh one is ~200MB, so this holds many while leaving
+	// the growth knob (resize the PVC / move to a snapshot backend, spec §19) to the
+	// operator. There is no storageClassName: the cluster default is the only safe
+	// binding, exactly like registryPVC.
+	backupStorageSize = "10Gi"
 	// UploadsLocalPath is the in-pod mount of the uploads PVC; a local
 	// user_uploads_context points here so the derived context ref and the on-disk
 	// write location agree. Exported so the setup wizard stamps it into felis.toml.
@@ -165,9 +174,10 @@ func InternalAPIBaseURL(controlNamespace string) string {
 
 // Workloads renders the running control-plane: the felis-api Deployment, the
 // felis-operator Deployment, and the in-cluster registry (Deployment + Service +
-// PVC), plus the reaper CronJob when reaperEnabled(p). FelisImage is required —
+// PVC), the world-archive PVC when p.BackupPVC names it (it backs the
-// `felis manifests` enforces it (fail-loud), so a rendered bundle always names a
+// backup/restore Jobs and the reaper), plus the reaper CronJob when
-// concrete image.
+// reaperEnabled(p). FelisImage is required — `felis manifests` enforces it
+// (fail-loud), so a rendered bundle always names a concrete image.
 func Workloads(p Params) []Object {
 	p = p.withDefaults()
 	objs := []Object{
@@ -180,6 +190,9 @@ func Workloads(p Params) []Object {
 		registryPVC(p),
 		uploadsPVC(p),
 	}
+	if p.BackupPVC != "" {
+		objs = append(objs, backupPVC(p))
+	}
 	if reaperEnabled(p) {
 		objs = append(objs, reaperCronJob(p))
 	}
@@ -656,6 +669,30 @@ func uploadsPVC(p Params) *corev1.PersistentVolumeClaim {
 	}
 }
 
+// backupPVC renders the world-archive store (spec §18/§19): the PVC the backup
+// and restore Jobs mount read-write, and the one the reaper CronJob writes
+// archives into. It renders ONLY when p.BackupPVC names it, so the same value
+// gates the PVC and the FELIS_BACKUP_PVC env on the felis-api Deployment — with
+// no name there is no PVC, no env, and the backup/restore endpoints keep
+// answering an honest 503 rather than enqueuing a Job that cannot mount its
+// backup. It lives in the Minecraft namespace because every pod that mounts it
+// runs there (a Pod can only mount PVCs from its own namespace; the reaper
+// CronJob is rendered there for the same reason). No storageClassName: binding
+// the cluster default is the only safe default.
+func backupPVC(p Params) *corev1.PersistentVolumeClaim {
+	p = p.withDefaults()
+	return &corev1.PersistentVolumeClaim{
+		TypeMeta:   metav1.TypeMeta{APIVersion: "v1", Kind: "PersistentVolumeClaim"},
+		ObjectMeta: metav1.ObjectMeta{Name: p.BackupPVC, Namespace: p.MinecraftNamespace, Labels: controlPlanePodLabels(ComponentAPI)},
+		Spec: corev1.PersistentVolumeClaimSpec{
+			AccessModes: []corev1.PersistentVolumeAccessMode{corev1.ReadWriteOnce},
+			Resources: corev1.VolumeResourceRequirements{
+				Requests: corev1.ResourceList{corev1.ResourceStorage: resource.MustParse(backupStorageSize)},
+			},
+		},
+	}
+}
+
 // registryLabels are the registry's recommended labels. Note the absence of
 // part-of=felis-control-plane: that is what keeps the registry out of the RCON
 // NetworkPolicy peer's reach (asserted in workloads_test.go).

internal/platform/workloads_test.go

@@ -321,6 +321,45 @@ func TestAPIDeployment_BackupPVC(t *testing.T) {
 	}
 }
 
+// TestBackupPVC_RendersWithTheStore proves the world-archive PVC is part of the
+// bundle exactly when a backup PVC is named, and that it lands in the Minecraft
+// namespace where every pod mounting it runs (the backup/restore Jobs and the
+// reaper CronJob) — the one property that made the reaper's first placement
+// unschedulable. Without a name the bundle must NOT create one: the api env is
+// gated on the same value, so the endpoints answer 503 instead of pointing a Job
+// at a claim nobody provisioned.
+func TestBackupPVC_RendersWithTheStore(t *testing.T) {
+	p := testParams()
+	p.BackupPVC = "felis-backups"
+	var got *corev1.PersistentVolumeClaim
+	for _, o := range Workloads(p) {
+		if pvc, ok := o.(*corev1.PersistentVolumeClaim); ok && pvc.Name == "felis-backups" {
+			got = pvc
+		}
+	}
+	if got == nil {
+		t.Fatalf("Workloads() must render PVC %q when BackupPVC is set", p.BackupPVC)
+	}
+	if got.Namespace != p.MinecraftNamespace {
+		t.Errorf("backup PVC namespace = %q, want %q (Pod↔PVC mounts are same-namespace only)", got.Namespace, p.MinecraftNamespace)
+	}
+	if len(got.Spec.AccessModes) != 1 || got.Spec.AccessModes[0] != corev1.ReadWriteOnce {
+		t.Errorf("backup PVC access modes = %v, want [ReadWriteOnce]", got.Spec.AccessModes)
+	}
+	if q := got.Spec.Resources.Requests.Storage(); q == nil || q.String() != backupStorageSize {
+		t.Errorf("backup PVC storage = %v, want %s", q, backupStorageSize)
+	}
+	if got.Spec.StorageClassName != nil {
+		t.Errorf("backup PVC pins storageClassName %q; the cluster default is the only safe binding", *got.Spec.StorageClassName)
+	}
+
+	for _, o := range Workloads(testParams()) {
+		if pvc, ok := o.(*corev1.PersistentVolumeClaim); ok && pvc.Name == "felis-backups" {
+			t.Error("no backup PVC may render when none is named")
+		}
+	}
+}
+
 // TestOperatorDeployment_Wiring pins the operator entrypoint, its namespace split,
 // and its deliberately smaller surface (NO config Secret — it holds no DB URL).
 func TestOperatorDeployment_Wiring(t *testing.T) {