The certificate automatically created by Pagoda will sometimes report NET::ERR_CERT_COMMON_NAME_INVALID, and it can only be used for three months each time. It is very troublesome to click to renew, and it is easy to forget.
Alibaba Cloud Free SSL Certificate
Go to the Alibaba Cloud management console [Digital Certificate Management Service] [SSL Certificate], 20 quotas per year, which will expire after one year
Fill in the applied domain name
After the application is successful, refresh the list page, you can see the download button, download the nginx version
Configure Pagoda
Configure the text content of the following two files in the pagoda panel [website] [ssl], 
you can see that the certificate configuration is successful