fix(cozystack): skip ZFS pool export on shutdown by default - #251
Aleksei Sviridkin (lexfrei) wants to merge 1 commit into
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughThe cozystack chart adds a ChangesZFS shutdown configuration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The documented first-reboot procedure now addresses the identified reboot risk. No actionable merge-blocking issue remains after normal checks. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The default addresses DRBD-related reboot hangs, but switching shutdown export back on may leave an earlier saved disabling configuration in place. This makes restoration unreliable for storage configurations that require export. Version limits and first-reboot precautions are documented; live restoration behavior remains unverified. Retained concerns
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Inline comments:
Review comments at @docs/manual-test-plan.md:
- Line 521: Update the live test sequence around the `ext-zfs-service`
environment check so the first reboot occurs only after draining the node,
stopping `linstor-satellite`, running `drbdsetup down all`, and verifying
`/sys/block/zd*/holders` is empty. Test rebooting with DRBD holders only after
the service has started with `ZFS_EXPORT_TIMEOUT=0`.
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charts/cozystack/templates/_helpers.tplcharts/cozystack/values.yamldocs/manual-test-plan.mdpkg/engine/contract_machine_test.gopkg/engine/contract_schema_test.gopkg/engine/testdata/golden/cozystack-controlplane-legacy.golden.yamlpkg/engine/testdata/golden/cozystack-controlplane-multidoc.golden.yamlpkg/engine/testdata/golden/cozystack-worker-legacy.golden.yamlpkg/engine/testdata/golden/cozystack-worker-multidoc.golden.yaml
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IvanHunters
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Verdict
LGTM with non-blocking notes
The fix is sound and well-pinned: the opt-out document is emitted by default on controlplane and worker across both the legacy and multi-doc schemas, drops cleanly under zfs.exportOnShutdown: true, stays off the generic preset, and survives the apply path (a node body that restates it de-duplicates to one document, and configloader.NewFromBytes loads it even on the v1.11 legacy contract). One schemaless-input edge is worth a line; it does not block.
Findings
- [MINOR]
charts/cozystack/templates/_helpers.tpl:447, bool toggle read viadigwith no values.schema.json
Caveats
- Upgrade default-flip: an existing N-1 cluster gets export-on-shutdown turned off by this upgrade. That is the intended fix and is safe for the standard single-host local ZFS/LINSTOR topology (crash-consistent COW, force-import next boot). Operators whose pools sit on dm-crypt/LUKS raw devices or are importable from several hosts must set
exportOnShutdown: true; the PR documents this. Verified by render + configloader load, not on a live node. TestContract_Machine_ZFSExport_LoadsThroughApplyPath_Cozystackexercises the configloader apply path for controlplane cells only; the worker config carries the same document (golden + render tests confirm presence) but its merge/load round-trip is not asserted. Minor test-completeness gap, sameMergeFileAsPatchpath.- Environment limits on this review host, not PR defects:
golangci-lintcould not run (built with go1.26, module targets go1.27.1);go test ./...has one unrelated failure (git init -bon git 2.23); barehelm templatecannot render talm charts (ipIsValidundefined) — the Go render helpers are the correct offline oracle and pass.
Recommended follow-ups
- Optional live reboot check (cozystack-pr-test style) on a node with DRBD holding the zvols, to confirm the operational claim (node returns in minutes, pool re-imports, LINSTOR resources UpToDate); out of scope for this static review.
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| {{- define "talos.config.zfs" }} | ||
| {{- if not (dig "zfs" "exportOnShutdown" false .Values) }} |
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[MINOR] bool toggle read via dig with no values.schema.json
The chart ships no values.schema.json, so dig "zfs" "exportOnShutdown" false .Values relies on Go-template truthiness, not a type check. Rendered corners: a quoted exportOnShutdown: "false" is a non-empty (truthy) string, so not "false" is false and the opt-out document is silently dropped — export runs on shutdown and the reboot-hang this PR fixes returns. A non-map zfs: <scalar> aborts the render with error calling dig: interface conversion: interface {} is string, not map[string]interface {}. Both are unusual inputs, neither loses data, and the chart's other boolean knobs (e.g. tcpKeepaliveTuning) share this schemaless behaviour, so this is non-blocking. If worth hardening, normalise the read (dig ... | toString | eq "true") or add a schema bool constraint.
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IvanHunters Reproduced both, and a bare zfs: aborted the render the same way. Now a non-bool exportOnShutdown or a non-map zfs fails with a message naming the field, like registryTLS does for insecureSkipVerify, and an empty zfs: keeps the default. Fixed in 95c63fc.
The talm page gets a section on the new cozystack preset setting that stops the ZFS extension from exporting the pool on shutdown. Without it, a node with LINSTOR on ZFS hangs in `rebooting` on every reboot, upgrade and reset while DRBD holds its zvols (cozystack/cozystack#4597). The talm side is cozystack/talm#251. The section says which disk layouts need the export back and that the fix only works on Talos v1.13.4 or later. Most of the text is the one-time reboot for clusters that already run. The running `zfs-service` keeps its old environment, so the first reboot after the change can still hang. The step that closes a dm-crypt mapping left by the LINSTOR LUKS layer has not been run on a live cluster yet. The satellite commands use `ds/linstor-satellite.<node>`. Piraeus runs one DaemonSet per node, so the `pod/linstor-satellite.<node>` form used on other install pages does not resolve. I left those pages alone in this PR. The heading says Talm v0.36+, the next minor after v0.35.0, so this should merge once that release is out. Applied to `next` and `v1.6`.
zfs-service runs `zpool export -a` when it stops. While DRBD holds the zvols the export blocks in the kernel in D-state, the extension's own timeout cannot kill it, and Talos waits for the service with no timeout, so a LINSTOR-on-ZFS node hangs in `rebooting` on every reboot, upgrade and reset until it is power-cycled. The preset now emits an ExtensionServiceConfig setting ZFS_EXPORT_TIMEOUT=0, which makes zfs-service skip the export; the pool is re-imported with `zpool import -f` on the next boot. The export only matters when the pool sits on dm-crypt devices or can be imported by several hosts, so zfs.exportOnShutdown: true drops the document for those setups. The chart has no values schema, so a non-boolean exportOnShutdown or a non-mapping zfs fails the render: template truthiness would read a quoted "false" as true and silently drop the document. The document is emitted on the legacy schema as well: Talos loaded ExtensionServiceConfig next to v1alpha1 long before v1.12. The legacy single-document contract is narrowed accordingly to what it guards: the machine config stays in one v1alpha1 document. Assisted-by: LLM Signed-off-by: Aleksei Sviridkin <f@lex.la>
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A Talos node with LINSTOR on ZFS hangs in
rebootingon every reboot, upgrade and reset while DRBD holds its zvols, and only a hard reset gets it out. On shutdownzfs-servicerunszpool export -a. With the zvols open the export blocks in the kernel (spa_export_common → taskq_wait), SIGKILL cannot end it, and the service never stops. The timeout added upstream in siderolabs/extensions#1104 does not help, because a timeout cannot kill a process in D-state.The cozystack preset now emits an
ExtensionServiceConfigforzfs-servicewithZFS_EXPORT_TIMEOUT=0, so the service skips the export. Pools come back withzpool import -fon the next boot. I tested it on a node with six zvols under DRBD:talosctl rebootfinished in about 90 seconds and every DRBD resource came backUpToDate.The export is only needed when the pool sits on dm-crypt/LUKS devices, since the mapping cannot close while the pool holds it. A pool that several hosts can import needs it too. For both cases
zfs.exportOnShutdown: truedrops the document. LUKS on top of zvols and native ZFS encryption keep raw disks under the pool, so they work with the default.A few limits:
zfs-servicekeeps its old environment, so the first reboot after apply still exports. For that one reboot DRBD has to go down by hand, and the steps are in thevalues.yamlcomment.The document is also emitted on the legacy schema, because machinery has loaded
ExtensionServiceConfignext to v1alpha1 since v1.7. The old legacy contract test asserted there is no---in the render at all. I renamed it and narrowed it to what it actually guards: the machine config stays in one v1alpha1 document.The chart has no values schema, so a quoted
"false"or any other non-booleanexportOnShutdown, and azfsthat is not a mapping, now fail the render instead of being read by template truthiness.Tests cover the default, the opt-out, the refused values, the generic preset without the document, and a render that loads in machinery on both schemas after a node body restates the document.
Refs cozystack/cozystack#4597, siderolabs/extensions#1270.
Summary by CodeRabbit
zfs.exportOnShutdownsetting, defaulting tofalse. With the default, ZFS shutdown exports use a zero-second timeout; set it totrueto omit this override and use the configured export behavior.