feat(postgres): add a postgis image flavor - #4587
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Tenants migrating spatial data need PostGIS, but the chart always runs the CloudNativePG PostgreSQL image, which does not ship it, and exposes no way to pick another one. CloudNativePG publishes a PostGIS operand image; a closed `flavor` enum selects it without handing tenants a free image field. The flavor pins the same PostgreSQL minor as the default one, on the standard-trixie variant: backups go through the barman-cloud plugin, so the deprecated system variant is not needed. update-versions.sh now derives the postgis map from the minors it picks, and a bats check fails if the two maps drift apart. The default images are built on bullseye and the postgis ones on trixie. Switching a live cluster between them would swap glibc under an initialised data directory and silently break every collatable index, and CNPG would roll it out as a plain image update. The chart therefore refuses a flavor change on an existing Cluster. Co-authored-by: Matthieu <[email protected]> Assisted-by: LLM Signed-off-by: Mattia Eleuteri <[email protected]>
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe PostgreSQL API and chart support PostgreSQL and PostGIS image flavors. The chart maps PostGIS image versions, selects the configured image for the Cluster and init Job, and checks flavor compatibility for existing clusters and backup restores. ChangesPostgreSQL image flavor and restore compatibility
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant RestoreReconciliation
participant BackupSnapshot
participant TargetPostgresApp
participant TargetCluster
RestoreReconciliation->>BackupSnapshot: Read source flavor
BackupSnapshot-->>RestoreReconciliation: Return snapshot flavor
RestoreReconciliation->>TargetPostgresApp: Read target flavor
RestoreReconciliation->>RestoreReconciliation: Normalize empty flavor to postgresql
RestoreReconciliation->>TargetCluster: Purge only when flavors match
Merge Risk: ⚪ Minimal · up to Cross-flavor changes and restores between PostgreSQL and PostGIS clusters are now refused before any target data is purged or recovery starts. Clusters that omit the flavor setting and legacy backup snapshots continue to behave as PostgreSQL. I found no remaining merge-blocking risk. Security Architecture ReviewSecurity architecture risk: 🟠 High · up to The new restore safeguards can rely on a flavor recorded from configuration rather than the image that produced the backup. A separate, chart-managed recovery path can also proceed without a source image to check. Under those conditions, an incompatible physical restore could damage database integrity. Retained concerns
Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @packages/apps/postgres/hack/update-versions.sh:
- Around line 97-103: In update-versions.sh, make a missing PostGIS tag for any
selected PostgreSQL minor fail the update and preserve the existing versions map
instead of writing partial output; stage output before replacing the map. In
hack/check-postgres-postgis-versions.bats, compare the keys of the PostgreSQL
and PostGIS version maps so missing entries fail CI.
Review comments at @packages/apps/postgres/templates/db.yaml:
- Line 251: Update postgres.flavorGuard and its recovery guidance to verify that
a physical backup’s source flavor matches the target flavor, including when the
target has no live destination. Reject cross-flavor physical recovery and direct
those moves to logical migration; distinguish same-flavor backup restores in the
suggestion.
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api/apps/v1alpha1/postgresql/types.gohack/check-postgres-postgis-versions.batspackages/apps/postgres/README.mdpackages/apps/postgres/files/postgis-versions.yamlpackages/apps/postgres/hack/update-versions.shpackages/apps/postgres/templates/_versions.tplpackages/apps/postgres/templates/db.yamlpackages/apps/postgres/templates/init-job.yamlpackages/apps/postgres/tests/flavor_test.yamlpackages/apps/postgres/values.schema.jsonpackages/apps/postgres/values.yamlpackages/system/postgres-rd/cozyrds/postgres.yaml
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The updater used to warn and leave a major out of postgis-versions.yaml
when the registry had no postgis build for its minor yet, while
versions.yaml still advertised it. `flavor: postgis` on that major then
failed to render. Postgis images trail the PostgreSQL ones, so this is a
routine state rather than an edge case: stop before writing either map
and let the next run pick up both once the image is published.
The version check now also compares the majors of the two maps, so a
map edited by hand cannot drop one silently. It is written in POSIX sh:
cozytest.sh sources it into /bin/sh, which is dash on the CI runners and
rejected the ${var//} expansions the first version used.
Assisted-by: LLM
Signed-off-by: Mattia Eleuteri <[email protected]>
A recovery replays the source's data directory, so it carries the same risk as switching the image of a live cluster: the postgresql and postgis images are built on different Debian releases, and the glibc change invalidates collatable indexes, while a postgis-to-postgresql move also loses the libraries behind every PostGIS object. The chart only guarded the live cluster, so a fresh release bootstrapped from a backup of the other flavor went through, and the guard's own advice was to restore a backup, which is that very move. The backup-controller now records the source flavor in the snapshot it stores on each Backup and fails a RestoreJob whose target runs another flavor, before the purge deletes the target's Cluster and PVCs. A snapshot without a flavor predates flavors and so comes from a postgresql cluster. For the chart-managed bootstrap, the chart compares against the recovery source's Cluster while it still exists. Both paths, and the live-cluster guard, point a flavor change to a logical dump. Assisted-by: LLM Signed-off-by: Mattia Eleuteri <[email protected]>
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mattia-eleuteri NOT LGTM, but only because of the rebase. The flavor itself is worth having: it uses the upstream CloudNativePG image, so there is nothing new to build or mirror, and two separate people have asked for PostGIS.
The branch conflicts with main in api/apps/v1alpha1/postgresql/types.go and the generated postgres-rd manifest, because #3506 added PreloadLibrary next to your Flavor. Keeping both types and running make generate in packages/apps/postgres resolves it.
There is also a conflict git will not show. #4558 added internal/backupcontroller/legacy_password_scrubber_test.go, and at line 96 it calls unmarshalCNPGBackupSnapshot with four return values. This PR changes that function to return the snapshot and an error, so after the merge the package does not compile. Changing the call to if _, err := unmarshalCNPGBackupSnapshot(&b) is enough. With both fixes on a local merge, go test ./internal/backupcontroller/ passes, and so do the 156 postgres unittests and both postgres bats files. Disabling either flavor guard makes its tests fail.
One small thing in the body, since it becomes the merge commit: "running PostGIS in production since today" will read wrong later, so a date would be better.
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What this PR does
Adds a
flavor: postgresql | postgisenum to thepostgresapp.postgisruns the cluster on the CloudNativePG PostGIS operand image, so tenants can enablepostgis,postgis_raster,postgis_topology,postgis_sfcgal,postgis_tiger_geocoderandaddress_standardizerthrough the existingdatabases.<name>.extensions. The default stayspostgresqland renders exactly the image it renders today.This picks up #2672 by Matthieu ROBIN (@matthieu-robin), which the stale bot closed after a rebase request, with these changes:
17.7-3.5,16.11-3.5, ...) do not exist inghcr.io/cloudnative-pg/postgis; the registry answers 404, so the flavor would have ended inImagePullBackOff. The map now uses tags that exist,<minor>-<postgis>-standard-trixie, on the same PostgreSQL minor asfiles/versions.yaml.standardrather thansystem: the chart archives through the barman-cloud plugin since the backup rework, so the operand no longer needs the barman binaries of the deprecatedsystemvariant.hack/update-versions.shderives the postgis map from the minors it picks, andhack/check-postgres-postgis-versions.batsfails if the two maps drift to different minors or away fromstandard-trixie.Cluster. The default images are built on Debian bullseye (glibc 2.31) and the postgis ones on trixie (glibc 2.41): CNPG would roll the swap out as a plain image update, under an initialised data directory, which silently invalidates every index on collatable text, and the postgis-to-postgresql direction also drops the libraries behind every PostGIS object. Only the image name is compared, so minor bumps and registry mirrors keep passing.pgroutingis not claimed: it is absent from the18.1-3.6.1build the chart pins and only appears in later postgis builds.A general mechanism (CNPG ImageVolume extensions) was considered and left out: it needs PostgreSQL 18 and Kubernetes 1.35 or the
ImageVolumegate, so it cannot serve v13-v17 nor most management clusters today, and PostGIS is the only extension CloudNativePG ships as a full operand image. No other extension request exists in this repository.Testing:
helm unittest packages/apps/postgres: 145/145, including 6 new cases intests/flavor_test.yaml(default image, postgis on the Cluster and on the init Job, the guard in both directions with a mocked live Cluster, and a mirrored digest-pinned image taking a new minor). Removing the guard makes exactly the two guard cases fail.hack/cozytest.sh hack/check-postgres-postgis-versions.batspasses, and fails on a shifted minor or asystemtag.make -C packages/apps/postgres generateleaves no diff.ghcr.io/cloudnative-pg/postgis:18.1-3.6.1-standard-trixiewas started locally:CREATE EXTENSIONfor citext, postgis, postgis_raster and postgis_topology succeeds andST_Bufferanswers. A three-instance cluster on thesystemsibling of that image has been running PostGIS in production since today.Screenshots
Downstream repositories
Release note
Summary by CodeRabbit
flavoroption for PostgreSQL clusters. The defaultpostgresqlflavor remains available, andpostgisselects an image that includes PostGIS extensions.