We need to add a label for pv to indicate which node this pv belongs to

[cwen0]

Sometimes, we need to count the status of pvs on special nodes by kubectl. Although we have added this information to nodeAffinity, this is not convenient for us to monitor by kubectl .

[weekface]

This is only suitable for local PV. However, other PVs don't bind to particular Node.

[cwen0]

@weekface Can we provide a way to monitor the status of the local PV ?

[weekface]

Use this command to get the custom columns:

kubectl get pv -l app.kubernetes.io/managed-by=tidb-operator -o=custom-columns=NAME:.metadata.name,NODE:.spec.nodeAffinity.required.nodeSelectorTerms[0].matchExpressions[0].values[0],PATH:.spec.local.path

The output is:

NAME                NODE           PATH
local-pv-168a01a7   172.16.1.2   /mnt/disks/disk1
local-pv-16cb93c9   172.16.1.3   /mnt/disks/disk2
local-pv-174bce80   172.16.1.4   /mnt/disks/disk3
local-pv-17514b6f   172.16.1.5   /mnt/disks/disk4

@cwen0

[tennix]

Using custom columns works great! But it's better to add claim and claim namespace. From claim name and namespace, users can know what pod occupies the underlining PV.

kubectl get pv -l app.kubernetes.io/managed-by=tidb-operator -o=custom-columns='NAMESPACE:spec.claimRef.namespace,CLAIM:.spec.claimRef.name,NAME:.metadata.name,NODE:.spec.nodeAffinity.required.nodeSelectorTerms[0].matchExpressions[0].values[0],PATH:.spec.local.path' 

We should add this to the operation documents, so users using local pv can easily know where the data directory is for a specific pod.

[gregwebs]

On GKE at least I see the node name in the annotation

               pv.kubernetes.io/provisioned-by: local-volume-provisioner-gke-beta-tidb-n1-standard-4-375-33507f39-rmkn-c233be3c-6068-11e9-9941-4201ac1f400a

[tennix]

Yes, for local volume there's a clear way to get the node name and directory path via the PV's nodeAffinity field.

[weekface]

Use tkctl get volume instead: https://github.com/pingcap/tidb-operator/blob/master/docs/cli-manual.md#tkctl-get-component