我尝试使用Kubuntu 18在Digital Ocean下为我的php / laravel应用程序设置ssl，如本文所述https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-18-04

但是我在尝试使用certbot获取免费的SSL证书时遇到错误：

# sudo ufw status
Status: active

To                         Action      From
--                         ------      ----
Apache Full                ALLOW       Anywhere                  
443                        ALLOW       Anywhere                  
80                         ALLOW       Anywhere                  
22/tcp                     ALLOW       Anywhere                                                                                                                                                                        
Apache Full (v6)           ALLOW       Anywhere (v6)                                                                                                                                                                   
443 (v6)                   ALLOW       Anywhere (v6)                                                                                                                                                                   
80 (v6)                    ALLOW       Anywhere (v6)                                                                                                                                                                   
22/tcp (v6)                ALLOW       Anywhere (v6)                                                                                                                                                                   

# sudo certbot --apache -d products-catalog.nilov-sergey-demo-apps.tk -d www.products-catalog.nilov-sergey-demo-apps.tk                                                                              
Saving debug log to /var/log/letsencrypt/letsencrypt.log                                                                                                                                                               
Plugins selected: Authenticator apache, Installer apache                                                                                                                                                               
Obtaining a new certificate                                                                                                                                                                                            
Performing the following challenges:
http-01 challenge for products-catalog.nilov-sergey-demo-apps.tk
http-01 challenge for www.products-catalog.nilov-sergey-demo-apps.tk
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. www.products-catalog.nilov-sergey-demo-apps.tk (http-01): urn:ietf:params:acme:error:dns :: DNS problem: NXDOMAIN looking up A for www.products-catalog.nilov-sergey-demo-apps.tk

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: www.products-catalog.nilov-sergey-demo-apps.tk
   Type:   None
   Detail: DNS problem: NXDOMAIN looking up A for
   www.products-catalog.nilov-sergey-demo-apps.tk

products-catalog.nilov-sergey-demo-apps.tk - 这是我在freenom.com上搜索的域名并搜索我发现需要为www子域添加A记录的提示

我试图将新记录添加为https://imgur.com/a/ijFxlzN但是我试图提交这个页面：

• Error occured: Invalid value in dnsrecord

怎么了 ？新纪录可以解决我的问题吗？或者我需要以其他方式移动？

UPDATED # 2 appache中的配置是：

<VirtualHost *:80>
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html/lprods/public    
    ServerName products-catalog.nilov-sergey-demo-apps.tk
    ServerAlias products-catalog.nilov-sergey-demo-apps.tk

    <Directory /var/www/html/lprods/public>
      AllowOverride All
      Order Deny,Allow
      Allow from all
      Require all granted
    </Directory>

    Options FollowSymLinks
    DirectoryIndex index.php

    ErrorLog /var/www/html/lprods/storage/logs/error.log
    CustomLog /var/www/html/lprods/storage/logs/access.log combined
</VirtualHost>

使用/ etc / hosts中的行

138.68.107.5  products-catalog.nilov-sergey-demo-apps.tk

它可以解决我的问题吗？

谢谢！

ssl certbot