====== 申請 Let's Encrypt 免費 SSL 憑證(Ubuntu + Cloudflare) ======
  * Ubuntu 18.04.5 LTS

===== 申請程序 =====
  * 下載 Let's Encrypt certbot 工具 <code sh>
sudo apt install certbot python3-certbot-dns-cloudflare
</code>
  * 建立 /root/lets-encrypt/cloudflare.ini <code sh>
sudo mkdir -p /root/lets-encrypt/
sudo vi /root/lets-encrypt/cloudflare.ini
</code>使用 Cloudflare 提供的資訊 Exp. <file>
# Cloudflare API credentials used by Certbot
dns_cloudflare_email = cloudflare@example.com
dns_cloudflare_api_key = 0123456789abcdef0123456789abcdef01234567
</file><code sh>
sudo chmod 600 /root/lets-encrypt/cloudflare.ini
</code>
  * 執行 certbot 工具申請憑證 Exp. harbor.ichiayi.com <code sh>
sudo certbot certonly \
  --dns-cloudflare \
  --dns-cloudflare-credentials /root/lets-encrypt/cloudflare.ini \
  --dns-cloudflare-propagation-seconds 10 \
  -d harbor.ichiayi.com
</code> 第一次執行會出現輸入 e-mail 與需要同意的一些服務訊息 \\ 執行範例畫面<cli>
sudo certbot certonly   --dns-cloudflare   --dns-cloudflare-credentials /root/lets-encrypt/cloudflare.ini   --dns-cloudflare-propagation-seconds 10   -d harbor.ichiayi.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator dns-cloudflare, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): info@ichiayi.com

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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
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(A)gree/(C)ancel: A

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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.
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(Y)es/(N)o: Y
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for harbor.ichiayi.com
Waiting 10 seconds for DNS changes to propagate
Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/harbor.ichiayi.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/harbor.ichiayi.com/privkey.pem
   Your cert will expire on 2021-01-27. 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

 - We were unable to subscribe you the EFF mailing list because your
   e-mail address appears to be invalid. You can try again later by
   visiting https://act.eff.org.
</cli>

===== 參考網址 =====
  * [[tech/ssl_letsencrypt]]


{{tag>SSL 免費憑證}}