# Deploying NFS in Constellation using Rook This document describes how to deploy NFS in Constellation using Rook. ## Create a Cluster The cluster needs at least 3 worker nodes, default machines are powerful enough. ```bash constellation create --name nfs -c 1 -w 3 ``` ## Deploy CSI Driver We need block storage form somewhere. We will use the official Azure CSI for that. We need to create the azure config secret again with the expected fields. Replace "XXX" with the corresponding value from the secret `azureconfig`. ```bash kubectl create secret generic -n kube-system --from-literal=cloud-config='{"cloud":"AzurePublicCloud","useInstanceMetadata":true,"vmType":"vmss","tenantId":"XXX","subscriptionId":"XXX","resourceGroup":"XXX","location":"XXX", "aadClientId":"XXX","aadClientSecret":"XXX"}' azure-config helm repo add azuredisk-csi-driver https://raw.githubusercontent.com/kubernetes-sigs/azuredisk-csi-driver/master/charts helm repo update azuredisk-csi-driver helm install azuredisk-csi-driver azuredisk-csi-driver/azuredisk-csi-driver --namespace kube-system --set linux.distro=fedora --set controller.cloudConfigSecretName=azure-config --set node.cloudConfigSecretName=azure-config ``` ## Deploy the StorageClass ```yaml apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: managed-premium provisioner: disk.csi.azure.com parameters: skuName: Premium_LRS cachingmode: ReadOnly kind: Managed volumeBindingMode: WaitForFirstConsumer ``` ## Deploy Rook ```bash git clone https://github.com/rook/rook.git cd rook/deploy/examples kubectl apply -f common.yaml -f crds.yaml -f operator.yaml kubectl rollout status -n rook-ceph deployment/rook-ceph-operator ``` Apply the following changes to `cluster-on-pvc.yaml`: ```diff euler@work:~/projects/rook/deploy/examples$ git diff cluster-on-pvc.yaml diff --git a/deploy/examples/cluster-on-pvc.yaml b/deploy/examples/cluster-on-pvc.yaml index ee4976be2..b5cf294cb 100644 --- a/deploy/examples/cluster-on-pvc.yaml +++ b/deploy/examples/cluster-on-pvc.yaml @@ -16,7 +16,7 @@ spec: mon: # Set the number of mons to be started. Generally recommended to be 3. # For highest availability, an odd number of mons should be specified. - count: 3 + count: 1 # The mons should be on unique nodes. For production, at least 3 nodes are recommended for this reason. # Mons should only be allowed on the same node for test environments where data loss is acceptable. allowMultiplePerNode: false @@ -28,7 +28,7 @@ spec: # size appropriate for monitor data will be used. volumeClaimTemplate: spec: - storageClassName: gp2 + storageClassName: managed-premium resources: requests: storage: 10Gi @@ -59,13 +59,13 @@ spec: # Certain storage class in the Cloud are slow # Rook can configure the OSD running on PVC to accommodate that by tuning some of the Ceph internal # Currently, "gp2" has been identified as such - tuneDeviceClass: true + tuneDeviceClass: false # Certain storage class in the Cloud are fast # Rook can configure the OSD running on PVC to accommodate that by tuning some of the Ceph internal # Currently, "managed-premium" has been identified as such - tuneFastDeviceClass: false + tuneFastDeviceClass: true # whether to encrypt the deviceSet or not - encrypted: false + encrypted: true # Since the OSDs could end up on any node, an effort needs to be made to spread the OSDs # across nodes as much as possible. Unfortunately the pod anti-affinity breaks down # as soon as you have more than one OSD per node. The topology spread constraints will @@ -100,7 +100,7 @@ spec: topologySpreadConstraints: - maxSkew: 1 # IMPORTANT: If you don't have zone labels, change this to another key such as kubernetes.io/hostname - topologyKey: topology.kubernetes.io/zone + topologyKey: kubernetes.io/hostname whenUnsatisfiable: DoNotSchedule labelSelector: matchExpressions: @@ -127,7 +127,7 @@ spec: requests: storage: 10Gi # IMPORTANT: Change the storage class depending on your environment - storageClassName: gp2 + storageClassName: managed-premium volumeMode: Block accessModes: - ReadWriteOnce ``` Now apply the yaml: ```bash kubectl apply -f cluster-on-pvc.yaml ``` Verify the health of the ceph cluster: ```bash $ kubectl apply -f toolbox.yaml $ kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph status cluster: id: 7c220b31-29f7-4f17-a291-3ef39a9553b3 health: HEALTH_OK services: mon: 3 daemons, quorum a,b,c (age 2m) mgr: a(active, since 72s) osd: 3 osds: 3 up (since 61s), 3 in (since 81s) data: pools: 1 pools, 1 pgs objects: 2 objects, 449 KiB usage: 62 MiB used, 30 GiB / 30 GiB avail pgs: 1 active+clean ``` Deploy the filesystem: ```bash $ kubectl apply -f filesystem.yaml $ kubectl -n rook-ceph exec -it deploy/rook-ceph-tools -- ceph status cluster: id: 7c220b31-29f7-4f17-a291-3ef39a9553b3 health: HEALTH_OK services: mon: 3 daemons, quorum a,b,c (age 3m) mgr: a(active, since 2m) mds: 1/1 daemons up, 1 hot standby osd: 3 osds: 3 up (since 2m), 3 in (since 2m) data: volumes: 1/1 healthy pools: 3 pools, 34 pgs objects: 24 objects, 451 KiB usage: 63 MiB used, 30 GiB / 30 GiB avail pgs: 34 active+clean io: client: 853 B/s rd, 1 op/s rd, 0 op/s wr progress: ``` Deploy the StorageClass: ```bash kubectl apply -f csi/cephfs/storageclass.yaml ``` Rescale the monitor count to 3: ```bash kubectl -n rook-ceph patch cephcluster rook-ceph --type merge -p '{"spec":{"mon":{"count":3}}}' ``` ## Use the NFS The following deployment will create a PVC based on NFS and mount it into 3 pods. ```yaml apiVersion: v1 kind: PersistentVolumeClaim metadata: name: nfs spec: accessModes: - ReadWriteMany resources: requests: storage: 5Gi storageClassName: rook-cephfs --- # from https://github.com/Azure/kubernetes-volume-drivers/tree/master/nfs apiVersion: apps/v1 kind: StatefulSet metadata: name: statefulset-nfs labels: app: nginx spec: serviceName: statefulset-nfs replicas: 3 template: metadata: labels: app: nginx spec: containers: - name: statefulset-nfs image: nginx command: - "/bin/sh" - "-c" - "sleep 9999999" volumeMounts: - name: persistent-storage mountPath: /mnt/nfs volumes: - name: persistent-storage persistentVolumeClaim: claimName: nfs readOnly: false updateStrategy: type: RollingUpdate selector: matchLabels: app: nginx ```