Restore MongoDB Clusters on Kubernetes With `pbm backup -t external`

MongoDB Percona Operator for MongoDB
1

We try to use `pbm backup -t external` to backup MongoDB on kubernetes.

Everything was going well until we started the restore operation.

First we try Reference documentation

  • pbm status status value done before restore mongodb
[mongodb@dev-rs-mdb-rs0-1 /]$ pbm describe-backup 2025-10-17T07:23:50Z

name: "2025-10-17T07:23:50Z"

opid: 68f1ef06ec800efad41d2a49

type: external

last_write_time: "2025-10-17T07:23:52Z"

last_transition_time: "2025-10-17T07:31:26Z"

mongodb_version: 6.0.24-19

fcv: "6.0"

pbm_version: 2.9.1

status: done

size_h: 0 B
  • Snapshots of backups shows ERROR after we delete and restore pvc from snapshot.

It seems that the snapshots of backups and the mongodb cluster have returned to the state betweem `pbm backup` and `pbm backup-finish`.

[mongodb@dev-rs-mdb-rs0-0 /]$ pbm status​

Cluster:​

========​

rs0:​

  - dev-rs-mdb-rs0-0.dev-rs-mdb-rs0.default.svc.cluster.local:27017 [S]: pbm-agent [v2.9.1] OK​

  - dev-rs-mdb-rs0-1.dev-rs-mdb-rs0.default.svc.cluster.local:27017 [P]: pbm-agent [v2.9.1] OK​

  - dev-rs-mdb-rs0-2.dev-rs-mdb-rs0.default.svc.cluster.local:27017 [S]: pbm-agent [v2.9.1] OK​

​

​

PITR incremental backup:​

========================​

Status [ON]​

Running members: rs0/dev-rs-mdb-rs0-2.dev-rs-mdb-rs0.default.svc.cluster.local:27017;​

​

Currently running:​

==================​

Snapshot backup "2025-10-17T07:23:50Z", started at 2025-10-17T07:23:50Z. Status: copyReady. [op id: 68f1ef06ec800efad41d2a49]​

​

Backups:​

========​

S3 us-east-1 http://10.3.xx.xx:80/test-backup/test-rs-mdb​

Snapshots:​

2025-10-17T07:23:50Z 0.00B <external> [ERROR: Backup stuck at `copyReady` stage, last beat ts: 1760686009] [2025-10-17T07:23:56Z]​

2025-10-15T10:31:58Z 0.00B <external> [restore_to_time: 2025-10-15T10:32:00Z]​

2025-10-15T05:45:56Z 0.00B <external> [restore_to_time: 2025-10-15T05:45:58Z]​

PITR chunks [53.42MB]:​

2025-10-17T07:14:12Z - 2025-10-17T07:24:11Z (no base snapshot)​
2

@xiaobao_wen do you use our PSMDB k8s operator or just use PBM for your k8s deployment?

3

use percona-server-mongodb-operator:1.20.4

4

Yes.PSMDB. By the ways, is it normal for external type backup size to be 0.00B?