[Bug]: unable to backup when we are more than 1 container in pod #8966
Description
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
Version
1.27 (latest patch)
What version of Kubernetes are you using?
1.34
What is your Kubernetes environment?
Self-managed: kind (evaluation)
How did you install the operator?
YAML manifest
What happened?
When deploying a PostgreSQL cluster via CNPG and Istio is enabled on the namespace, Istio automatically adds a sidecar to the pod or controller when it performs the backup, comparing the image of the first container with the image defined in the CNPG cluster. The problem is that if the first container is not PostgreSQL, the backup remains stuck in ‘Active’ status and this error message appears in the controller logs:
{‘level’:‘debug’,“ts”:" 2025-10-26T07:49:29.003680028Z‘,’msg‘:’Instance not having expected image, discarded as target for backup‘,’controller‘:’backup‘,’controllerGroup‘:’postgresql.cnpg.io‘,’controllerKind‘:“Backup”,’ Backup‘:{’name‘:’postgresql-20251026084856‘,’namespace‘:’databases‘},’namespace‘:’databases‘,“name”:’postgresql-20251026084856‘,’ reconcileID‘:’f4dd8a41-2755-4086-89f8-e1daa10bb2bc‘,“caller”:’internal/controller/backup_controller.go:692"}
Cluster resource
apiVersion: postgresql.cnpg.io/v1
kind: Cluster
metadata:
name: postgresql
namespace: databases
spec:
monitoring:
enablePodMonitor: true
instances: 3
imageCatalogRef:
apiGroup: postgresql.cnpg.io
kind: ClusterImageCatalog
name: postgresql-minimal-trixie
major: 18
resources:
limits:
memory: 600Mi
requests:
cpu: 200m
memory: 600Mi
plugins:
- name: barman-cloud.cloudnative-pg.io
isWALArchiver: true
parameters:
barmanObjectName: minio-store
storage:
storageClass: longhorn
size: 4Gi
walStorage:
storageClass: longhorn
size: 4Gi
backup:
volumeSnapshot:
className: longhorn
bootstrap:
initdb:
database: bitnami_keycloak
owner: bn_keycloak
secret:
name: postgresql-app
managed:
roles:
- name: admin
ensure: present
comment: admin user
login: true
superuser: true
passwordSecret:
name: postgresql-admin
- name: adhesion
ensure: present
comment: adhesion user
login: true
superuser: false
passwordSecret:
name: postgresql-adhesion
- name: bn_keycloak
ensure: present
comment: bn_keycloak user
login: true
superuser: false
passwordSecret:
name: postgresql-app
- name: communication
ensure: present
comment: communication user
login: true
superuser: false
passwordSecret:
name: postgresql-communication
- name: finance
ensure: present
comment: finance user
login: true
superuser: false
passwordSecret:
name: postgresql-finance
- name: sonar
ensure: present
comment: sonar user
login: true
superuser: false
passwordSecret:
name: postgresql-sonarRelevant log output
{"level":"debug","ts":"2025-10-26T07:49:28.615298496Z","msg":"reconciling object `databases/postgresql-20251026084856`","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:116"}
{"level":"debug","ts":"2025-10-26T07:49:28.637618Z","msg":"Found cluster for backup","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:164","cluster":"postgresql"}
{"level":"debug","ts":"2025-10-26T07:49:29.003337907Z","msg":"Instance not having expected image, discarded as target for backup","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:692"}
{"level":"debug","ts":"2025-10-26T07:49:29.003383699Z","msg":"Instance not having expected image, discarded as target for backup","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:692"}
{"level":"debug","ts":"2025-10-26T07:49:29.003396823Z","msg":"Instance not having expected image, discarded as target for backup","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:692"}
{"level":"debug","ts":"2025-10-26T07:49:29.003407323Z","msg":"No ready instances found as target for backup, defaulting to primary","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:738"}
{"level":"debug","ts":"2025-10-26T07:49:29.003680028Z","msg":"Instance not having expected image, discarded as target for backup","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","caller":"internal/controller/backup_controller.go:692"}
{"level":"info","ts":"2025-10-26T07:49:29.003763735Z","msg":"Couldn't find target pod, will retry in 30 seconds","controller":"backup","controllerGroup":"postgresql.cnpg.io","controllerKind":"Backup","Backup":{"name":"postgresql-20251026084856","namespace":"databases"},"namespace":"databases","name":"postgresql-20251026084856","reconcileID":"f4dd8a41-2755-4086-89f8-e1daa10bb2bc","target":"postgresql-2"}
{"level":"info","ts":"2025-10-26T07:49:29.003988607Z","logger":"events","msg":"Couldn't find target pod postgresql-2, will retry in 30 seconds","type":"Warning","object":{"kind":"Backup","namespace":"databases","name":"postgresql-20251026084856","uid":"a22c1a8e-aaa9-46ec-9a96-aadefdafa1c1","apiVersion":"postgresql.cnpg.io/v1","resourceVersion":"1077019247"},"reason":"FindingPod"}Code of Conduct
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