Kubernetes pod volume [gcePersistentDisk] zone specification - kubernetes

Question

I have set up a nfs-server in our cluster which references a compute disk that's being created by terraform. Here is the script to create the deployment:
apiVersion: apps/v1
kind: Deployment
metadata:
name: nfs-server
namespace: storage
spec:
replicas: 1
selector:
matchLabels:
role: nfs-server
template:
metadata:
labels:
role: nfs-server
spec:
containers:
- name: nfs-server
image: gcr.io/google_containers/volume-nfs:0.8
ports:
- name: nfs
containerPort: 2049
- name: mountd
containerPort: 20048
- name: rpcbind
containerPort: 111
securityContext:
privileged: true
volumeMounts:
- mountPath: /exports
name: nfs-pvc
volumes:
- name: nfs-pvc
gcePersistentDisk:
pdName: testing-airflow-disk
fsType: ext4
The error I'm encountering is that when a pod is created by this deployment sometimes it is looking for the gcePersistentDisk in different zones [europe-west1-c, europe-west1-b]. The disk resides in europe-west1-b so I would like to specify the disk zone but can't seem to find in the docs where that can be done in the deployment yaml.

Answer 1

The solution I found based on Neskews answer was to set a node affinity condition on the deployment to only use nodes which have the same zone label as the disk zone specification. The code for this looks like:
apiVersion: apps/v1
kind: Deployment
metadata:
name: nfs-server
namespace: storage
spec:
replicas: 1
selector:
matchLabels:
role: nfs-server
template:
metadata:
labels:
role: nfs-server
spec:
containers:
- name: nfs-server
image: gcr.io/google_containers/volume-nfs:0.8
ports:
- name: nfs
containerPort: 2049
- name: mountd
containerPort: 20048
- name: rpcbind
containerPort: 111
securityContext:
privileged: true
volumeMounts:
- mountPath: /exports
name: nfs-pvc
volumes:
- name: nfs-pvc
gcePersistentDisk:
pdName: testing-airflow-disk
fsType: ext4
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: topology.kubernetes.io/zone
operator: In
values:
- europe-west1-b