# Certificate Management

## Add Certificate

The Certificate Management stores certificates in the ULB Certificate Management system for the HTTPS protocol.

> Certificates cannot be used across Regions. If they are needed in multiple regions, the certificate must be uploaded to each region.

### Operation Steps
Enter the **Load Balancing ULB page**, click **Certificate Management**. 

1、Click **Add Certificate**, and the add certificate dialog box pops up.

2、The following information needs to be filled in

|Configuration|Description|
|---|---|
|Certificate Name|Certificate Name, Mandatory.|
|Certificate Contents| If you choose to upload the certificate locally, choose the authorization certificate on your local, including .crt and .key files. If you choose to manually enter the certificate, you need to manually enter the certificate in the input box, for the certificate format please refer to [Certificate Format Requirements](/docs/ulb/clb/guide/certificate/certificateformat). If you choose to import from USSL, select the domain name of the certificate purchased or uploaded on the USSL platform.|
|Certificate Format|Authorizing Certificate (.crt file): The public key file issued by the certificate authority. Authorization certificate (.key file): The private key file issued by the certificate authority. CA Agency Certificate (.crt file): The certificate proves that the certificate agency is an authoritative agency.|

3、Import from USSL

Click **Import from USSL**, and switch to select the USSL certificate domain name.

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## Delete Certificate

### Operation Steps

Enter the **Load Balancing ULB** page, click **Certificate Management**.

> Certificates bound to resources cannot be deleted. If the certificate is imported from USSL, deleting it will not affect the original certificate on the USSL platform. Similarly, deleting the certificate on the USSL platform will not delete the certificate that has already been imported in the ULB Certificate Management, they are mutually exclusive.

#### Delete a Single Certificate

1、Select the certificate you want to delete, click **Delete**.

2、A pop-up window will appear showing the selected certificate information, confirm if it’s the certificate you want to delete.

3、Click **Confirm** to delete the certificate.

#### Batch Certificate Deletion

1、Batch select the **checkboxes** on the left of certificates to be deleted, click **Delete Certificate** at the top.

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2、A pop-up window will appear showing the selected certificate information, confirm if they are the certificates you want to delete.

3、Click **Confirm** to finish batch deletion of certificates.

## Bind Certificate

After the certificate is uploaded, when creating a listening HTTPS VServer, you can use the uploaded certificate.

## Operation Steps: 

1、Click **Add VServer**, increase listening rules.

2、After the listening protocol is HTTPS, select the SSL certificate, at this point you can choose the certificate stored in the certificate management system.


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3、After the configuration is done, you can see the newly added VServer on the left, and you can view the certificate bound to the VServer.

## Change Binding Certificate

Enter the **VServer Management Page**, you can update the certificate.

### Operation Steps

1、On the right side of the basic information module, click **Change Settings**.

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2、Select the certificate to be replaced from the drop-down box, click **Confirm** to successfully replace it.

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