[SOLVED] Rezise Kuberneets Pod Volume

Rezise Kuberneets Pod Volume

I want to resize Kubernetes Persistent Volume. So I tried by editing

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: postgres-pvc
  labels:
    app: postgres
spec:
  storageClassName: aws-gp2
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 50Gi

But I got error following error

error: persistentvolumeclaims "postgres-pvc" could not be patched: persistentvolumeclaims "postgres-pvc" is forbidden: only dynamically provisioned pvc can be resized and the storageclass that provisions the pvc must support resize

Then I went to AWS console and resized the PVC to 50GB. Now I see volume size to 50GB

root@postgres-8654848bb4-6897j:/# lsblk
NAME          MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
nvme0n1       259:0    0  100G  0 disk
├─nvme0n1p1   259:1    0  100G  0 part /etc/hosts
└─nvme0n1p128 259:2    0    1M  0 part
nvme1n1       259:3    0    5G  0 disk
nvme2n1       259:4    0    5G  0 disk
nvme3n1       259:5    0    5G  0 disk
nvme4n1       259:6    0    1G  0 disk
nvme5n1       259:7    0    5G  0 disk
nvme6n1       259:8    0   50G  0 disk /var/lib/postgresql/data
nvme7n1       259:9    0    1G  0 disk
nvme8n1       259:10   0    1G  0 disk
nvme9n1       259:11   0  200G  0 disk

But its not reflecting in df -h

root@postgres-8654848bb4-6897j:/# df -h
Filesystem      Size  Used Avail Use% Mounted on
overlay         100G   30G   71G  30% /
tmpfs            64M     0   64M   0% /dev
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/nvme0n1p1  100G   30G   71G  30% /etc/hosts
shm              64M  236K   64M   1% /dev/shm
/dev/nvme6n1    9.7G  8.8G  930M  91% /var/lib/postgresql/data
tmpfs           7.0G   12K  7.0G   1% /run/secrets/kubernetes.io/serviceaccount
tmpfs           3.9G     0  3.9G   0% /proc/acpi
tmpfs           3.9G     0  3.9G   0% /sys/firmware

Then I tried resize2fs command but got following error

root@postgres-8654848bb4-6897j:/# resize2fs /dev/nvme6n1
resize2fs 1.46.2 (28-Feb-2021)
open: No such file or directory while opening /dev/nvme6n1

root@postgres-8654848bb4-6897j:/# resize2fs /var/lib/postgresql/data
resize2fs 1.46.2 (28-Feb-2021)
open: Is a directory while opening /var/lib/postgresql/data

Any help with this here ?

Solution

Easiest way you can use the allowVolumeExpansion in StorageClass , i did for Elasticsearch Database

Checkout my article on that : https://medium.com/@harsh.manvar111/resizing-pvc-disk-in-gke-c5b882c90f7b

strogeclasss

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
 …
provisioner: kubernetes.io/gce-pd
allowVolumeExpansion: true

Update PVC after this with the desired size you are looking forward to keep and restart the POD.