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Get SSL Certificates (Let’s Encrypt)

Get SSL Certificates from Let’s Encrypt who provides Free SSL Certificates.
Refer to the details for Let’s Encrypt official site below.
⇒ https://letsencrypt.org/
By the way, expiration date of a cert is 90 days, so you must update within next 90 days later.
[1] Install Certbot Client which is the tool to get certificates from Let’s Encrypt.

[2] Get certificates.
It needs Web server like Apache httpd or Nginx must be runing on the server you work.
If no Web server is running, skip this section and Refer to [3] section.
Furthermore, it needs that it’s possible to access from the Internet to your working server on port 80 because of verification from Let’s Encrypt.

[3] If no Web Server is running on your working server, it’s possbile to get certs with using Certbot’s Web Server feature. Anyway, it needs that it’s possible to access from the Internet to your working server on port 80 because of verification from Let’s Encrypt.

[4] For Updating existing certs, Do like follows.