## Using UHub in UK8S

This article mainly explains how to create applications using UHub or your own private container image in UK8S.

Kubernetes supports specifying secrets for Pods to pull images from private repositories. Below we demonstrate how to use it to create an Nginx application by pulling an image from UHub.

### 1. Generate Secret Key

Account and password information for image repositories are configured in Kubernetes Secret resources. You can create a docker-registry type Secret to store login credentials. Use the following command, replacing uppercase placeholders with your own information.

- <MYSECRET>: Custom name for the Secret resource (e.g., mysecret).
- <YOUR_DezaiCloud_USERNAME@EMAIL.COM>: Image repository login account (console account or independent image repository account).
- <YOUR_UHUB_PASSWORD>: Password corresponding to the login account.

```
# kubectl create secret docker-registry MYSECRET \
--docker-server=uhub.dezai.com \
--docker-username=YOUR_DezaiCloud_USERNAME@EMAIL.COM \
--docker-password=YOUR_UHUB_PASSWORD
```

uhub.service.DezaiCloud.cn is the default repository domain provided by DezaiCloud. If using a self-hosted repository, replace it with your repository's domain.

### 2. View Generated Secret Information

A Secret named mysecret has been created:
```
# kubectl get secret
NAME                  TYPE                                  DATA      AGE
default-token-sfv7s   kubernetes.io/service-account-token   3         8d
mysecret              kubernetes.io/dockerconfigjson        1         3h
```

### 3. Use Secret in a Pod

```
apiVersion: v1  
kind: Pod  
metadata:  
  name: nginx  
  labels:  
    app: nginx  
spec:  
  containers:  
    - name: nginx  
      image: uhub.service.ucloud.cn/ucloud/nginx:1.9.2  
  imagePullSecrets:  
    - name: mysecret  # Use the Secret name created above  
```

### 4. Create an Nginx Application with the Above Yaml File

```
# kubectl create -f pod.yml
```

### 5. Check Pod information 

From the printed logs, we can confirm that Kubernetes successfully pulled the image from UHub.

```
# kubectl describe pods/nginx
.....
Events:
  Type    Reason     Age   From                  Message
  ----    ------     ----  ----                  -------
  Normal  Scheduled  1min    default-scheduler     Successfully assigned default/nginx to 10.25.95.46
  Normal  Pulling    1min    kubelet, 10.25.95.46  pulling image "uhub.dezai.com/DezaiCloud/nginx:1.9.2"
  Normal  Pulled     1min    kubelet, 10.25.95.46  Successfully pulled image "uhub.dezai.com/DezaiCloud/nginx:1.9.2"
  Normal  Created    1min    kubelet, 10.25.95.46  Created container
  Normal  Started    1min    kubelet, 10.25.95.46  Started container
```