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Use the free HTTPS certificate provider letsencrypt. You need to install a command line tool to generate the certificate files required by https:

  1. Install snap, a package management tool similar to apt
sudo snap install core; sudo snap refresh core

two。 Install certbot using snap

sudo snap install --classic certbot
  1. Configure certbot command
sudo ln -s /snap/bin/certbot /usr/bin/certbot
  1. Generate HTTPS certificate
certbot --server -d "" --manual --preferred-challenges dns-01 certonly

Here are a few parameters:

  1. Server: HTTPS service provider
  2. D: the domain name that needs to be configured with HTTPS (can be a secondary domain name) During the generation process, those who prompt Yes,No can directly enter Y enter, and the last step will prompt you to configure TXT resolution of a domain name (not Enter here): loading… In the domain name console, add a TXT resolution as prompted, as shown in the figure: loading… After parsing is configured, Enter determines it and waits for files such as cert.pem to be generated. A successful generation will output the path of the pem file, usually / etc/letsencrypt/live. loading…

Be careful

  1. This certificate will expire (valid for 3 months) and need to be regenerated by certbot renew two。 Do not move, copy and other operations on the generated certificate file! (read and use with absolute path)

Renew refresh certificate

Because it is the txt record of the domain name resolution configuration, it cannot be directly renew and needs to be manually re-recorded. Re-execute [4. Generate HTTPS certificate], then restart nginx and execute nginx-s reload