Simple Application Server:Install an SSL certificate in a Node.js environment

Step 1: Create a Node.js simple application server

1. Log on to the Simple Application Server console.

2. In the left-side navigation pane, click Servers.

3. Click Create Server in the upper-right corner of the Servers page. On the Simple Application Server page, configure parameters based on your business requirements.

   For more information, see Create a simple application server.

   In the Image section, select the Node.js 16.5.0 application image on the Apps Image tab.

Step 2: Purchase an SSL certificate

Purchase a certificate

1. Visit the Buy Now page of the Certificate Management Service console.

2. Select specifications for the certificate that you want to purchase based on your business requirements.

   Parameter	Description	Example
   Certificate Type	Specify the type of the domain name to which you want to bind the certificate. Valid values: Single Domain: If you select this value, you can bind the certificate to a single domain name. For example: if you bind the certificate to aliyundoc.com, the certificate is automatically applied to www.aliyundoc.com free of charge. Wildcard Domain: If you have multiple servers that use wildcard subdomains at the same level, you must purchase and install only one certificate. You do not need to purchase and install a certificate for each subdomain. The following list describes the matching rules of a wildcard domain name: Only subdomains at the same level can be matched. Subdomains at different levels cannot be matched. For example, if you bind the certificate to *.aliyundoc.com, subdomains such as demo.aliyundoc.com and learn.aliyundoc.com are matched. Subdomains such as guide.demo.aliyundoc.com and developer.demo.aliyundoc.com are not matched. If the parent domain name of a wildcard domain name is a first-level domain name, the certificate bound to the wildcard domain name is automatically applied to the parent domain name free of charge. For example, if you apply for a certificate bound to *.aliyundoc.com, the certificate is automatically applied to aliyundoc.com free of charge. If you apply for a certificate bound to *.demo.aliyundoc.com, the certificate is not applied to demo.aliyundoc.com or aliyundoc.com domain name free of charge. You can apply for a certificate bound to one wildcard domain name. You cannot apply for a certificate bound to multiple wildcard domain names. If you want to bind a certificate to multiple wildcard domain names, you can combine multiple certificates of the same brand and type to generate a multi-domain wildcard certificate. For more information, see Combine certificates. Multiple Domains: If you select this value, you can bind the certificate to multiple single domain names. You can bind a certificate to up to five single domain names.	Single Domain
   Brand	Select a certificate brand. The certificate brand is the certificate authority (CA) that issues the certificate to you. For more information about certificate brands, see Select an SSL certificate.	Digicert
   Certificate Specifications	Select a specification for the certificate. For more information about certificate specifications, see Select an SSL certificate.	DV SSL
   Domain Names	This parameter is required only if you set the Certificate Type parameter to Multiple Domains. Specify the number of domain names to which you want to bind the certificate.	1
   Quantity	Specify the number of certificates that you want to purchase. The default value is 1 and cannot be changed. If you want to purchase multiple certificates, configure the Service Duration parameter. For example, if you set the Service Duration parameter to 2 Years, two certificates are provided. Each certificate has a validity period of one year.	1
   Service Duration	Select the validity period of the certificate service. Valid values: 1 Year: You can use the certificate service for one year. The service provides a certificate whose validity period is one year. The default validity period of a certificate is one year. After a certificate expires, you must place a new order to purchase a new certificate. 2 Years: You can use the certificate service for two years. The certificate service provides two certificates and a hosting quota of 1. Each certificate has a validity period of one year. For more information about the certificate hosting feature, see Overview. 3 Years: You can use the certificate service for three years. The certificate service provides three certificates and a hosting quota of 2. Each certificate has a validity period of one year.	1 Year

3. Click Buy Now and complete the payment.

Apply for a certificate

1. Log on to the Certificate Management Service console.

2. In the left-side navigation pane, click SSL Certificates.

3. On the Manage Certificates tab of the SSL Certificates page, find the certificate for which you want to apply and click Apply for Certificate in the Actions column.

4. In the Apply for Certificate panel, configure parameters based on your business requirements, select the Quick Issue check box, and then click Submit.

   Parameter		Description or example
   Certificate Type		Single Domain
   Certificate Specifications		digicert DV
   Domain Name		Enter the domain name of the Node.js simple application server to which you want to bind the certificate. Example: aliyundoc.com.
   Validity Period (Years)		1
   Quick Issue	Domain Verification Method	If Alibaba Cloud DNS is activated within the Alibaba Cloud account of the certificate applicant, Certificate Management Service automatically identifies the domain name when you apply for a certificate. Automatic DNS Verification is automatically selected and cannot be changed. Wait for the certificate to be issued. If Alibaba Cloud DNS is not activated within the Alibaba Cloud account of the certificate applicant, you can use one of the following methods to verify the ownership of the domain name: Manual DNS Verification: You must manually add a TXT record for your domain name in the system of your DNS service provider to complete the verification. File Verification: You must manually download a dedicated verification file from the Certificate Management Service console and upload the file to the required verification directory of your web server.
   	Contact	In the Contact drop-down list, click Create Contact to create a contact for the certificate application. You can also select an existing contact. Make sure that your contact information is accurate and valid.
   	Location	Select the city or region of the certificate applicant.
   	Encryption Algorithm	Specify the encryption algorithm of the certificate. The default value is RSA and cannot be changed. The Rivest-Shamir-Adleman (RSA) algorithm is a widely used asymmetric algorithm that provides high compatibility.
   	CSR Generation	Specify the method to generate a Certificate Signing Request (CSR) file. A CSR file is the request file that contains server and company information of the certificate applicant. When you apply for a certificate, you must prepare a CSR file for the CA to review. If you select Automatic, Certificate Management Service uses the encryption algorithm that you configured to generate a CSR file.

5. If the Domain Verification Method parameter is set to Automatic DNS Verification, the system completes DNS verification, and you only need to wait for the certificate to be issued. If the Domain Verification Method parameter is set to Manual DNS Verification or File Verification, you must manually verify the ownership of the domain name based on the Verify Information parameter. For more information and common errors, see Verify the ownership of a domain name.

   After you submit the application, wait approximately 30 minutes for the CA to review your application and issue the certificate. After the certificate is issued, the status of the certificate changes to Issued.

Step 3: Configure the SSL certificate

After a certificate is issued, the value of Status for the certificate changes to Issued. You must download and configure the certificate. For more information, see Installation overview.

1. Download the certificate.

   1. On the SSL Certificates page, click the Manage Certificates tab, find the certificate that you want to download, and then click Download in the Actions column.

   2. In the Download Certificate dialog box, download a package based on the server type.

      In this topic, download the NGINX package to use NGINX to forward data.

      Warning

      After you download the package, keep it properly to prevent your website from being attacked due to certificate leaks.

      

   3. After the package is decompressed, two files are displayed, as shown in the following figure.

      

2. Use a tool such as WinSCP or Xshell to upload the .key and .pem certificate files to a specified directory, such as /home, of the Node.js simple application server.

3. Connect to the simple application server. For more information, see Connect to a Linux server.

4. Run the following command to create a file named https_server_test.js:

   cd /home
   sudo touch https_server_test.js

5. Run the following command to modify the https_server_test.js file:

   vim https_server_test.js

   Press the i key to enter the edit mode and add the following content to the https_server_test.js file: Sample code:

   // An https package is required to start the https service.
   // An fs package is required to read the files.
   const https = require('https');
   const fs = require('fs');
   
   // Read the files and write them into the options object.
   // Use the readFileSync() method to read the files and start the https service.
   const options = {
       key: fs.readFileSync('/home/cert-file-name.key'),
       cert: fs.readFileSync('/home/cert-file-name.pem')
   };
   
   // Create a server, start the server, and set the listening port number for the server.
   https.createServer(options, (req, res) => {
       res.end('hello world\n');
   }).listen(443);

   Parameter description:

   • /home/cert-file-name.key: the absolute path of the .key certificate file.

   • /home/cert-file-name.pem: the absolute path of the .pem certificate file.

   Important

   To ensure that the certificate can be configured and accessed over HTTPS as expected, you must correctly configure the paths of the certificate files.

6. After you add the preceding content, press the Esc key to exit the edit mode. Then, enter :wq and press the Enter key to save and exit the file.

7. Run the following command to activate the certificate:

   sudo node https_server_test.js

8. Use a browser to access https://<Domain name of the simple application server>.

   • If a lock icon appears in the address bar of the browser, the certificate is installed.

   • If the domain name is not accessible over HTTPS, check whether port 443 is enabled and not blocked by other tools on the simple application server. For more information about how to enable port 443, see Manage the firewall of a simple application server.