I'm trying to replace the in-memory storage of Grafana deployment with persistent storage using kustomize. What I'm trying to do is that I'm removing the in-memory storage and then mapping persistent storage. But When I'm deploying it then it is giving me an error.
Error
The Deployment "grafana" is invalid: spec.template.spec.containers[0].volumeMounts[1].name: Not found: "grafana-storage"
Kustomize version
{Version:kustomize/v4.0.5 GitCommit:9e8e7a7fe99ec9fbf801463e8607928322fc5245 BuildDate:2021-03-08T20:53:03Z GoOs:linux GoArch:amd64}
kustomization.yaml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
- https://github.com/prometheus-operator/kube-prometheus
- grafana-pvc.yaml
patchesStrategicMerge:
- grafana-patch.yaml
grafana-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: grafana-storage
namespace: monitoring
labels:
billingType: "hourly"
region: sng01
zone: sng01
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 2Gi
storageClassName: ibmc-file-bronze
grafana-patch.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: grafana
name: grafana
namespace: monitoring
spec:
template:
spec:
volumes:
# use persistent storage for storing users instead of in-memory storage
- $patch: delete <---- trying to remove the previous volume
name: grafana-storage
- name: grafana-storage
persistentVolumeClaim:
claimName: grafana-storage
containers:
- name: grafana
volumeMounts:
- name: grafana-storage
mountPath: /var/lib/grafana
please help.
The $patch: delete doesn't seem to work as I would expect.
It may be nice to open an issue on kustomize github: https://github.com/kubernetes-sigs/kustomize/issues and ask developers about it.
Although here is the patch I tried, and it seems to work:
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: grafana
name: grafana
namespace: monitoring
spec:
template:
spec:
volumes:
- name: grafana-storage
emptyDir: null
persistentVolumeClaim:
claimName: grafana-storage
containers:
- name: grafana
volumeMounts:
- name: grafana-storage
mountPath: /var/lib/grafana
The following should also work in theory:
spec:
volumes:
- $retainKeys:
- name
- persistentVolumeClaim
name: grafana-storage
persistentVolumeClaim:
claimName: grafana-storage
But in practise it doesn't, and I think that's because kustomize has its own implementaions of strategic merge (different that k8s).