Is there an existing issue already for this bug?

• I have searched for an existing issue, and could not find anything. I believe this is a new bug.

I have read the troubleshooting guide

• I have read the troubleshooting guide and I think this is a new bug.

I am running a supported version of CloudNativePG

• I have read the troubleshooting guide and I think this is a new bug.

Contact Details

jakub.hajek@close.com

Version

1.27 (latest patch)

What version of Kubernetes are you using?

1.31

What is your Kubernetes environment?

Cloud: Amazon EKS

How did you install the operator?

Helm

What happened?

During cluster reconciliation, the plugin service returns a “closed pool” error.

The reconciler fails with the error message “while getting plugin connection: closed pool,” indicating that a connection pool (likely using the puddle library) is being accessed after it has been closed.

The cluster controller should be able to establish a plugin connection during reconciliation without encountering this error.

We use the CNPG v1.27.0 and Barman Cloud plugin v0.6.0.

The issue has already been discussed with @leonardoce on the Slack channel. Thank you very much for that.

Cluster resource

Relevant log output

{
  "level": "error",
  "ts": "2025-09-09T09:20:33.464509208Z",
  "msg": "Reconciler error",
  "controller": "cluster",
  "controllerGroup": "postgresql.cnpg.io",
  "controllerKind": "Cluster",
  "Cluster": {
    "name": "pg-cluster1",
    "namespace": "default"
  },
  "namespace": "default",
  "name": "pg-cluster1",
  "reconcileID": "9fc416b6-7764-4977-bda1-034b4ce3875b",
  "error": "while getting plugin connection: closed pool",
  "stacktrace": "sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).reconcileHandler\n\tpkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:353\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).processNextWorkItem\n\tpkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:300\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller[...]).Start.func2.1\n\tpkg/mod/sigs.k8s.io/controller-runtime@v0.21.0/pkg/internal/controller/controller.go:202"
}

Code of Conduct

• I agree to follow this project's Code of Conduct