ubuntu使用certbot给nginx添加ssl证书

首先确认网站部署完成，已经能通过80端口访问

安装certbot

sudo snap install --classic certbot

执行

sudo certbot --nginx

第一次执行需要填个邮箱来注册，所有步骤如下

// 1. 输入你的邮箱
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Enter email address (used for urgent renewal and security notices)
 (Enter 'c' to cancel): [email protected]   
 
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// 2. 是否同意服务条款，输入y
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. Do you agree?
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(Y)es/(N)o: y    

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// 3. 是否同意接收推送邮件，输入y或n
Would you be willing, once your first certificate is successfully issued, 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: n
Account registered.

Which names would you like to activate HTTPS for?
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1: xxxxx.com
2: yyyyy.com

// 4. 选择给nginx配置中的域名添加证书，输入序号选择，或直接回车选择所有
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Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel): 
Requesting a certificate for xxxxx.com

Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/xxxxx.com/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/xxxxx.com/privkey.pem
This certificate expires on 2022-08-01.
These files will be updated when the certificate renews.
Certbot has set up a scheduled task to automatically renew this certificate in the background.
Deploying certificate
Successfully deployed certificate for xxxxx.com to /etc/nginx/sites-enabled/xxxx
Congratulations! You have successfully enabled HTTPS on xxxxx.com
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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
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// 5.结束，可直接访问https站点

手动更新证书

sudo certbot renew

证书有效期为3个月，默认到期前会自动更新，修改配置后需手动更新