├── LICENSE ├── README.md ├── TEST.md ├── create-nfs-server ├── nfs-server-pvc.yaml ├── nfs-server-rc.yaml ├── nfs-server-service.yaml ├── storage-class-gce-fast.yaml └── storage-class-gce-slow.yaml /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. 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I could not get the PersistentVolumeClaim (PVC) to use the PersistentVolume (PV) on Google Container Engine (GKE) that is defined for the client to use an NFS share in the example. This could be a GKE issue. The sample included here demonstrates how to directly mount an NFS share via your pod's YAML, skipping the client-side PVC/PV declarations. This method works in GKE 1.6. 6 | 7 | This defines two storage classes, fast (ssd) and slow. This is the only YAML that is specific to GKE. You can create your own storage classes for your provider if not GKE. Or, you can just comment out the storageClassName declaration in the nfc-server-pvc.yaml to use your provider's default. 8 | 9 | The create-nfs-server file shows you the commands to execute, and the order, to create your nfs-server. 10 | 11 | The last command displays the ClusterIP of your service. You will need that to add a mount to pods that 12 | consume the NFS shares. Here is what you will add to your pod spec: 13 | 14 | volumes: 15 | - name: nfs 16 | nfs: 17 | server: 18 | path: / 19 | 20 | This maps to /exports in your server. You can map to subfolders inside exports. But, that folder must exist already when you create your pod. Otherwise, you will get an error and your pod will never run. 21 | 22 | If you create /exports/myapp/data in your nfs-server, you can then use this path in your pod declaration: 23 | 24 | path: /myapp/data 25 | 26 | This introduces some configuration and maintenance to your NFS PV. Keep in mind that this PV will exist until the PVC that created it is deleted. You can safely delete your nfs-server without losing your PV so long as you don't delete your PVC. 27 | 28 | You will probably want some sort of snapshot/backup policy for your PV as it can become the host for your pod configuration and data. 29 | 30 | ## Resizing volumes 31 | 32 | As of 1.6, Kubernetes lacks help in this area. 33 | 34 | You can use your provider, such as GKE, to resize the volume. 35 | 36 | You'll likely have to follow that up by shelling into the nfs-server container and do a resize2fs to resize the file system, which can be installed with "yum install e2fsprogs". Use "df -h" to identify the device mounted at /exports. 37 | 38 | This does not update the PersistentVolumeClaim (PVC). While you can update the YAML you use to create the PVC for the next time you use it, in Kubernetes 1.6, you cannot change the capacity of a bound PVC. Deleting and re-creating the PVC will destroy the PV, so it is not a practical option. 39 | 40 | ## Known Issues 41 | 42 | [Hung volumes can wedge the kubelet #31272](https://github.com/kubernetes/kubernetes/issues/31272) 43 | 44 | -------------------------------------------------------------------------------- /TEST.md: -------------------------------------------------------------------------------- 1 | 2 | 3 | | Tables | Are | Cool | 4 | | ------------- |:-------------:| -----:| 5 | | col 3 is | right-aligned | $1600 | 6 | | col 2 is | centered | $12 | 7 | | zebra stripes | are neat | $1 | 8 | 9 | | Tables | Are | Cool | 10 | | ------------- |:-------------:| -----:| 11 | | col 3 is | right-aligned | $1600 | 12 | | col 2 is | centered | $12 | 13 | | zebra stripes | are neat | $1 | 14 | 15 | Markdown | Less | Pretty 16 | --- | --- | --- 17 | *Still* | `renders` | **nicely** 18 | 1 | 2 | 3 19 | 20 | | col | col | 21 | | ----- | ----- | 22 | | 1 | 2 | 23 | -------------------------------------------------------------------------------- /create-nfs-server: -------------------------------------------------------------------------------- 1 | kubectl create -f storage-class-gce-slow.yaml 2 | kubectl create -f storage-class-gce-fast.yaml 3 | kubectl create -f nfs-server-pvc.yaml 4 | kubectl create -f nfs-server-rc.yaml 5 | kubectl create -f nfs-server-service.yaml 6 | 7 | # You will need the ClusterIP of the nfs-server service 8 | kubectl describe services nfs-server 9 | -------------------------------------------------------------------------------- /nfs-server-pvc.yaml: -------------------------------------------------------------------------------- 1 | kind: PersistentVolumeClaim 2 | apiVersion: v1 3 | metadata: 4 | name: nfs-server-pvc-fast 5 | spec: 6 | storageClassName: fast 7 | accessModes: 8 | - ReadWriteOnce 9 | resources: 10 | requests: 11 | storage: 10Gi 12 | -------------------------------------------------------------------------------- /nfs-server-rc.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: ReplicationController 3 | metadata: 4 | name: nfs-server 5 | spec: 6 | replicas: 1 7 | selector: 8 | role: nfs-server 9 | template: 10 | metadata: 11 | labels: 12 | role: nfs-server 13 | spec: 14 | containers: 15 | - name: nfs-server 16 | image: gcr.io/google_containers/volume-nfs:0.8 17 | ports: 18 | - name: nfs 19 | containerPort: 2049 20 | - name: mountd 21 | containerPort: 20048 22 | - name: rpcbind 23 | containerPort: 111 24 | securityContext: 25 | privileged: true 26 | volumeMounts: 27 | - mountPath: /exports 28 | name: nfs-export-fast 29 | volumes: 30 | - name: nfs-export-fast 31 | persistentVolumeClaim: 32 | claimName: nfs-server-pvc-fast 33 | -------------------------------------------------------------------------------- /nfs-server-service.yaml: -------------------------------------------------------------------------------- 1 | kind: Service 2 | apiVersion: v1 3 | metadata: 4 | name: nfs-server 5 | spec: 6 | ports: 7 | - name: nfs 8 | port: 2049 9 | - name: mountd 10 | port: 20048 11 | - name: rpcbind 12 | port: 111 13 | selector: 14 | role: nfs-server 15 | -------------------------------------------------------------------------------- /storage-class-gce-fast.yaml: -------------------------------------------------------------------------------- 1 | kind: StorageClass 2 | apiVersion: storage.k8s.io/v1 3 | metadata: 4 | name: fast 5 | provisioner: kubernetes.io/gce-pd 6 | parameters: 7 | # type: pd-standard or pd-ssd. Default: pd-standard 8 | type: pd-ssd 9 | # GCE zone. If neither zone nor zones is specified, volumes are generally round-robin-ed 10 | # across all active zones where Kubernetes cluster has a node. zone and zones parameters 11 | # must not be used at the same time. 12 | # zones: us-central1-a, us-central1-b 13 | 14 | -------------------------------------------------------------------------------- /storage-class-gce-slow.yaml: -------------------------------------------------------------------------------- 1 | kind: StorageClass 2 | apiVersion: storage.k8s.io/v1 3 | metadata: 4 | name: slow 5 | provisioner: kubernetes.io/gce-pd 6 | parameters: 7 | # type: pd-standard or pd-ssd. Default: pd-standard 8 | type: pd-standard 9 | # GCE zone. If neither zone nor zones is specified, volumes are generally round-robin-ed 10 | # across all active zones where Kubernetes cluster has a node. zone and zones parameters 11 | # must not be used at the same time. 12 | # zones: us-central1-a, us-central1-b 13 | 14 | --------------------------------------------------------------------------------