JuiceFS CSI Driver

The JuiceFS Container Storage Interface (CSI) Driver implements the CSI specification for container orchestrators to manage the lifecycle of JuiceFS file system.

Prerequisites

Kubernetes 1.14+

Installation

There are two ways to install JuiceFS CSI Driver.

1. Install via Helm

Prerequisites

Helm 3.1.0+

Install Helm

Helm is a tool for managing Kubernetes charts. Charts are packages of pre-configured Kubernetes resources.

To install Helm, refer to the Helm install guide and ensure that the helm binary is in the PATH of your shell.

Using Helm To Deploy

Prepare a YAML file

Create a configuration file, for example: values.yaml, copy and complete the following configuration information. Among them, the backend part is the information related to the JuiceFS file system, you can refer to JuiceFS Quick Start Guide for more information. If you are using a JuiceFS volume that has been created, you only need to fill in the two items name and metaurl. The mountPod part can specify CPU/memory limits and requests of mount pod for pods using this driver. Unneeded items should be deleted, or their value should be left blank.

storageClasses:
- name: juicefs-sc
  enabled: true
  reclaimPolicy: Retain
  backend:
    name: "<name>"
    metaurl: "<meta-url>"
    storage: "<storage-type>"
    accessKey: "<access-key>"
    secretKey: "<secret-key>"
    bucket: "<bucket>"
  mountPod:
    resources:
      limits:
        cpu: "<cpu-limit>"
        memory: "<memory-limit>"
      requests:
        cpu: "<cpu-request>"
        memory: "<memory-request>"

Check and update kubelet root-dir

Execute the following command.

$ ps -ef | grep kubelet | grep root-dir

If the result is not empty, it means that the root-dir path of kubelet is not the default value and you need to set kubeletDir to the current root-dir path of kubelet in the configuration file values.yaml prepared in the first step.

kubeletDir: <kubelet-dir>

Deploy

helm repo add juicefs-csi-driver https://juicedata.github.io/charts/
helm repo update
helm install juicefs-csi-driver juicefs-csi-driver/juicefs-csi-driver -n kube-system -f ./values.yaml

Check the deployment

Check pods are running: the deployment will launch a StatefulSet named juicefs-csi-controller with 1 replica and a DaemonSet named juicefs-csi-node, so run kubectl -n kube-system get pods -l app.kubernetes.io/name=juicefs-csi-driver should see n+1 (where n is the number of worker nodes of the Kubernetes cluster) pods are running. For example:

$ kubectl -n kube-system get pods -l app.kubernetes.io/name=juicefs-csi-driver
NAME                       READY   STATUS    RESTARTS   AGE
juicefs-csi-controller-0   3/3     Running   0          22m
juicefs-csi-node-v9tzb     3/3     Running   0          14m

Check secret: kubectl -n kube-system describe secret juicefs-sc-secret will show the secret with above backend fields in values.yaml:

Name:         juicefs-sc-secret
Namespace:    kube-system
Labels:       app.kubernetes.io/instance=juicefs-csi-driver
              app.kubernetes.io/managed-by=Helm
              app.kubernetes.io/name=juicefs-csi-driver
              app.kubernetes.io/version=0.7.0
              helm.sh/chart=juicefs-csi-driver-0.1.0
Annotations:  meta.helm.sh/release-name: juicefs-csi-driver
              meta.helm.sh/release-namespace: default

Type:  Opaque

Data
====
access-key:  0 bytes
bucket:      47 bytes
metaurl:     54 bytes
name:        4 bytes
secret-key:  0 bytes
storage:     2 bytes

Check storage class: kubectl get sc juicefs-sc will show the storage class like this:

NAME         PROVISIONER       RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
juicefs-sc   csi.juicefs.com   Retain          Immediate           false                  69m

2. Install via kubectl

Since Kubernetes will deprecate some old APIs when a new version is released, you need to choose the appropriate deployment configuration file.

Check the root directory path of kubelet.

Execute the following command on any non-Master node in the Kubernetes cluster.

$ ps -ef | grep kubelet | grep root-dir

Deploy

If the check command returns a non-empty result, it means that the root-dir path of the kubelet is not the default value, so you need to update the kubeletDir path in the CSI Driver's deployment file and deploy.

# Kubernetes version >= v1.18
curl -sSL https://raw.githubusercontent.com/juicedata/juicefs-csi-driver/master/deploy/k8s.yaml | sed 's@/var/lib/kubelet@{{KUBELET_DIR}}@g' | kubectl apply -f -

# Kubernetes version < v1.18
curl -sSL https://raw.githubusercontent.com/juicedata/juicefs-csi-driver/master/deploy/k8s_before_v1_18.yaml | sed 's@/var/lib/kubelet@{{KUBELET_DIR}}@g' | kubectl apply -f -

Note: please replace {{KUBELET_DIR}} in the above commands with the actual root directory path of kubelet.

If the check command returns an empty result, you can deploy directly without modifying the configuration:

# Kubernetes version >= v1.18
kubectl apply -f https://raw.githubusercontent.com/juicedata/juicefs-csi-driver/master/deploy/k8s.yaml

# Kubernetes version < v1.18
kubectl apply -f https://raw.githubusercontent.com/juicedata/juicefs-csi-driver/master/deploy/k8s_before_v1_18.yaml

Troubleshooting & FAQs

If you encounter any issue, please refer to Troubleshooting or FAQs document.

Upgrade CSI Driver

Refer to Upgrade Csi Driver document.

Examples

Before the example, you need to:

Get yourself familiar with how to setup Kubernetes and how to use JuiceFS file system.
Make sure JuiceFS is accessible from Kuberenetes cluster. It is recommended to create the file system inside the same region as Kubernetes cluster.
Install JuiceFS CSI driver following the Installation steps.

Example links

Notes:

Since JuiceFS is an elastic file system it doesn't really enforce any file system capacity. The actual storage capacity value in PersistentVolume and PersistentVolumeClaim is not used when creating the file system. However, since the storage capacity is a required field by Kubernetes, you must specify the value and you can use any valid value e.g. 10Pi for the capacity.

CSI Specification Compatibility

JuiceFS CSI Driver \ CSI Version	v0.3	v1.0
master branch	no	yes

Interfaces

The following CSI interfaces are implemented:

Node Controller: CreateVolume, DeleteVolume
Node Service: NodePublishVolume, NodeUnpublishVolume, NodeGetCapabilities, NodeGetInfo, NodeGetId
Identity Service: GetPluginInfo, GetPluginCapabilities, Probe