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6. Let's Encrypt 無料サーバー証明書

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無料なので、Let's Encrypt サーバー証明書を利用してみる。

# dnf install certbot
# certbot

Certbot doesn’t know how to automatically configure the web server on this system. However, it can still get a certificate for you. Please run “certbot certonly” to do so. You’ll need to manually configure your web server to use the resulting certificate.



# certbot certonly
How would you like to authenticate with the ACME CA?
-------------------------------------------------------------------------------
1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
-------------------------------------------------------------------------------
Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel):<自分のメールアドレス>

-------------------------------------------------------------------------------
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf. You must agree
in order to register with the ACME server at
https://acme-v01.api.letsencrypt.org/directory
-------------------------------------------------------------------------------
(A)gree/(C)ancel: A

-------------------------------------------------------------------------------
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 EFF and
our work to encrypt the web, protect its users and defend digital rights.
-------------------------------------------------------------------------------
(Y)es/(N)o: <任意>


Select the webroot for 192.168.3.7:
-------------------------------------------------------------------------------
1: Enter a new webroot
-------------------------------------------------------------------------------
Press 1 [enter] to confirm the selection (press 'c' to cancel): 1


次に webroot の入力を求められるので、/var/www/html と入力すると、

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /etc/letsencrypt/live/192.168.3.7/fullchain.pem. Your cert will
   expire on 2017-11-10. To obtain a new or tweaked version of this
   certificate in the future, simply run certbot again. 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
自己サーバー証明書に関する記述と置き換える。
# vi /etc/nginx/nginx.conf
     ssl_certificate "/etc/letsencrypt/192.168.3.7/cert.pem";
     ssl_certificate_key "/etc/letsencrypt/live/192.168.3.7/privkey.pem";

# nginx -t
# nginx -s reload

# crontab -e
0 3 * * * /usr/bin/certbot renew
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