Statefulset pod is using more storage than defined in the volumeClaimTemplates-CodePudding

I created below statfulset on microk8s:

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgresql13
spec:
  selector:
    matchLabels:
      app: postgresql13
  serviceName: postgresql13
  replicas: 1
  template:
    metadata:
      labels:
        app: postgresql13
    spec:
      containers:
        - name: postgresql13
          image: postgres:13
          imagePullPolicy: Always
          ports:
            - containerPort: 5432
              name: sql-tcp
          volumeMounts:
            - name: postgresql13
              mountPath: /data
          env:
            - name: POSTGRES_PASSWORD
              value: testpassword
            - name: PGDATA
              value: /data/pgdata
  volumeClaimTemplates:
    - metadata:
        name: postgresql13
      spec:
        storageClassName: "microk8s-hostpath"
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 1Ki

in the volumeClaimTemplates i gave it only 1Ki (this is one KB right ?) But the DB started normally and when i run kubectl exec postgresql13-0 -- df -h on the pod i get this

Filesystem                         Size  Used Avail Use% Mounted on
overlay                             73G   11G   59G  15% /
tmpfs                               64M     0   64M   0% /dev
/dev/mapper/ubuntu--vg-ubuntu--lv   73G   11G   59G  15% /data
shm                                 64M   16K   64M   1% /dev/shm
tmpfs                              7.7G   12K  7.7G   1% /run/secrets/kubernetes.io/serviceaccount
tmpfs                              3.9G     0  3.9G   0% /proc/acpi
tmpfs                              3.9G     0  3.9G   0% /proc/scsi
tmpfs                              3.9G     0  3.9G   0% /sys/firmware

Isn't is supposed to not use more than what the PVC have ? I intentially sat the storage class AllowVolumeExpansion: False

what am i missing here ?

CodePudding user response：

allowVolumeExpansion and storage size does not apply to hostPath. The actual size will be the host volume size where the host path resides.

CodePudding user response：

Isn't is supposed to not use more than what the PVC have?

This is a misunderstanding. What you specify in a resource request is the resources your application needs at least. You might get more. You typically use resource limits to set hard limits.