HTTPS通信について｜サーバー証明書にはLet’sEncryptが便利

$ sudo apt install certbot python3-certbot-nginx

$ sudo vi /etc/nginx/sites-available/default

#server_name_;
server_name example.com;

$ sudo nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

$ sudo service nginx restart

$ sudo certbot --nginx -d hoge.com

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): [メールアドレス]を入力します。

Please read the Terms of Service at

404 Page not found -  Let's Encrypt
 Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG). 

letsencrypt.org
 You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory

(A)gree/(C)ancel: [A]を入力します。同意書を読んだ上で。

Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.

(Y)es/(N)o: [Y]を入力します。certbotに関しての連絡にメールアドレスを使用。

Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.example.com
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/nginx/sites-enabled/default

Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.

1: No redirect - Make no further changes to the webserver configuration.
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
new sites, or if you're confident your site works on HTTPS. You can undo this
change by editing your web server's configuration.

Select the appropriate number [1-2] then [enter] (press 'c' to cancel): [2]を入力します。HTTPにアクセスがあった場合でも自動でHTTPSに振り分ける設定になります。

Future versions of Certbot will automatically configure the webserver so that all requests redirect to secure HTTPS access. You can control this behavior and disable this warning with the --redirect and --no-redirect flags.

Congratulations! You have successfully enabled

Example Domain

www.example.com


You should test your configuration at:

SSL Server Test (Powered by Qualys SSL Labs)
A comprehensive free SSL test for your public web servers.

www.ssllabs.com

IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/www.example.com/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/www.example.com/privkey.pem
Your cert will expire on 2021-09-11. To obtain a new or tweaked
version of this certificate in the future, simply run certbot again
with the "certonly" option. To non-interactively renew *all* of
your certificates, run "certbot renew"
- Your account credentials have been saved in your Certbot
configuration directory at /etc/letsencrypt. You should make a
secure backup of this folder now. This configuration directory will
also contain certificates and private keys obtained by Certbot so
making regular backups of this folder is ideal.
- If you like Certbot, please consider supporting our work by:

Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate
Donating to EFF:                    https://eff.org/donate-le

/etc/nginx/sites-available/default

$ sudo systemctl status certbot.timer

$ sudo certbot renew --dry-run