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Deploy Grafana with existing PV#

The goal of this documentation is to be able to redeploy Grafana from an existing PV when there is no longer a statefulset and PVC.

Variable: 

CLIENT=xxx

Step 1 : Get a PVC definition on another zone#

kswitch svc-grafana-client-pf
kubectl get pvc -n grafana-client-obs-pf storage-grafana-obs-pf-0 -o yaml > /tmp/def_pvc.yaml

Step 2 : Edit PVC definition with zone parameters#

Connect to the zone: 

kswitch svc-grafana-client-${CLIENT}

Modify client name: 

sed -i "s/obs-pf/obs-${CLIENT}/g" /tmp/def_pvc.yaml

Edit PV reference: 

pv_name=$(kubectl get pv -o json | jq -r --arg contract "obs-${CLIENT}" '.items[] | select(.spec.claimRef.name == "storage-grafana-"+$contract+"-0") | .metadata.name')
sed -i "s/volumeName: *.*$/volumeName: ${pv_name}/g" /tmp/def_pvc.yaml

Update PV size (possibly it will be the same size): 

storage_size=$(kubectl get pv -o json | jq -r --arg contract "obs-${CLIENT}" '.items[] | select(.spec.claimRef.name == "storage-grafana-"+$contract+"-0") | .spec.capacity.storage')
sed -i "s/storage: *.*$/storage: ${storage_size}/g" /tmp/def_pvc.yaml

Verify definition: 

echo ${pv_name}
echo ${storage_size}
cat /tmp/def_pvc.yaml

Expected result:

  • same PV name
  • storage size is correct
  • no old reference to obs-pf

Step 3 : Ensure that the PV is available#

kubectl patch "pv/${pv_name}" --type json -p='[{"op": "remove", "path": "/spec/claimRef"}]'


kubectl get pv "${pv_name}" -o jsonpath="{ .status.phase }"
Expected result: Available.

Step 4 : Apply PVC with new parameters#

This step allows you to have a PVC which is directly attached to the already existing PV.

kubectl apply -f /tmp/def_pvc.yaml

Step 5 : apply with trackbone#

This step will only redeploy the statefulset.

cd contexts/ngot
trackbone apply -z svc-grafana-client-${CLIENT} -c grafana