Docs: add en/juicefs_on_rancher.md (#880)

* Docs: add zh_cn/juicefs_on_rancher.md

* update

* update

* fix

* Docs: add en/juicefs_on_rancher.md

* update TOC
Co-authored-by: Nliyong <chnliyong@gmail.com>

docs/en/README.md

@@ -37,6 +37,7 @@ JuiceFS can simply and conveniently connect massive cloud storage directly to bi
   - [Use JuiceFS on Docker](juicefs_on_docker.md)
   - [Use JuiceFS on Kubernetes](how_to_use_on_kubernetes.md)
   - [Use JuiceFS on K3s](juicefs_on_k3s.md)
+  - [One-click deployment of JuiceFS on Rancher](juicefs_on_rancher.md)
   - [Use JuiceFS on Hadoop ecosystem](hadoop_java_sdk.md)
   - [JuiceFS enable S3 Gateway](s3_gateway.md)
   - [JuiceFS client compilation and upgrade](client_compile_and_upgrade.md)

docs/en/juicefs_on_rancher.md

+# One-click deployment of JuiceFS on Rancher
+
+[Rancher](https://rancher.com/) is an enterprise-level Kubernetes cluster management system, which can be used to quickly complete the deployment of Kubernetes clusters on various cloud computing platforms.
+
+Rancher provides a browser-based management interface, even users who are not experienced in Kubernetes can start to manage and use easily. It is preset with Helm-based application market by default, and various Kubernetes applications can be installed very easy under the graphical interface.
+
+This article will introduce how to deploy Rancher on a Linux system and create a Kubernetes cluster with it, and then deploy JuiceFS CSI Driver with one click through the application market, thereby providing data persistence for various applications on the cluster.
+
+## Install Rancher
+
+Rancher can be installed on almost all modern Linux distributions. It can be installed directly on the operating system, or on Docker, Kubernetes, K3s or RKE. The installation is "Product-Ready" no matter which environment it is installed in.
+
+Here we choose to install Rancher on Docker, with the following requirements:
+
+- **Operating System**: Linux system with x86-64 architecture
+- **Memory**: 4GB or more
+- **Docker**: 19.03+
+
+Run the following command to install Rancher:
+
+```shell
+$ sudo docker run --privileged -d --restart=unless-stopped -p 80:80 -p 443:443 rancher/rancher
+```
+
+After the container is created, Rancher's management interface can be opened by accessing the IP address of the host.
+
+![](../images/rancher-welcome.jpeg)
+
+## Create a Kubernetes cluster
+
+After Rancher is installed, you can see that it has deployed a K3s cluster in the current container, and Rancher related resources are running in this internal K3s cluster, but we don't need to pay attention to this cluster now.
+
+Next, start to create a Kubernetes cluster. In the Cluster section of the welcome page, click `Create` to create a cluster. Rancher supports the creation of Kubernetes clusters on major cloud computing platforms. Here we need to create a cluster directly on Rancher's host, so choose `Custom`. Then fill in the cluster name according to the wizard and select the Kubernetes version.
+
+![](../images/rancher-cluster-create.jpg)
+
+In the `Cluster Options` page, select the node role to be created, then copy the generated command and execute it on the target host.
+
+![](../images/rancher-cluster-options.jpg)
+
+After the cluster is created, it will be displayed in Rancher's cluster list.
+
+![](../images/rancher-clusters.jpg)
+
+## One-click installation of JuiceFS CSI Driver
+
+In the cluster list, click to enter the Kubernetes cluster, click on the left navigation menu to expand `Apps & Marketplace` -> `Chart Repositories`, click the `Create` button to add JuiceFS CSI repository, fill in:
+
+- **Name**: juicefs
+- **Index URL**: https://juicedata.github.io/juicefs-csi-driver/
+
+![](../images/rancher-new-repo.jpg)
+
+And then, you can see the new repository in the list.
+
+![](../images/rancher-repos.jpg)
+
+Then click to open the `Apps & Marketplace` -> `Charts` from the left menu, type `juicefs` in the search bar, and then click to open `juicefs-csi-driver`.
+
+![](../images/rancher-chart-search.jpg)
+
+Click the "Install" button on the application details page, the latest version will be installed by default, or you can click to switch to the historical version to install.
+
+![](../images/rancher-chart-info.jpg)
+
+The installation wizard has two steps:
+
+### Step 1: Set up the `Namespace`
+
+The JuiceFS CSI Driver defaults to `kube-system`, and there is no need to set this step.
+
+### Step 2: Adjust configuration parameters
+
+This page provides a YAML editor, you can adjust JuiceFS-related information according to your needs. Usually you only need to modify the `storageClasses` part, where the `backend` part is used to define the backend database and object storage of the file system. You can refer to [JuiceFS Quick Start Guide](https://github.com/juicedata/juicefs/blob/main/docs/zh_cn/quick_start_guide.md) to learn the detail. If you are using a pre-created file system, you only need to fill in the two items `metaurl` and `name`, for example:
+
+```yaml
+...
+storageClasses:
+  - backend:
+      accessKey: ''
+      bucket: ''
+      metaurl: 'redis://:mypasswd@efgh123.redis.rds.aliyuncs.com/1'
+      name: myjfs
+      secretKey: '' 
+      storage: ''
+    enabled: true
+    name: juicefs-sc
+    reclaimPolicy: Retain
+...
+```
+
+> **Tip**: If you have multiple JuiceFS file systems that need to be associated with different storageClasses in the Kubernetes cluster, you can add storageClass configuration items after the `storageClasses` array. Pay attention to modify the name of the storage class to avoid conflicts.
+
+Click "Install" and wait for the application installation to complete.
+
+![](../images/rancher-chart-installed.jpg)
+
+## Use JuiceFS to persist data
+
+When deploying an application, specify `juicefs-sc` in the storage configuration.
+
+![](../images/rancher-pvc.jpg)
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