安装 certbot

Certbot 的官方网站是 https://certbot.eff.org/ ，打开这个链接选择自己使用的 web server 和操作系统，EFF 官方会给出详细的使用方法，以下以本网站域名（ bbs.wzlinux.com ）举例。
我是debian10需要先安装snap

sudo apt update
sudo apt install snapd

先跟新

sudo snap install core
sudo snap refresh core

在安装certbot

sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot

自动配置证书

sudo certbot --nginx
sudo certbot renew --dry-run  //自动续证书

这是自动配置证书的时候的过程

root@localhost:/www/cloud.shagain.club# certbot --nginx
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): 178963@qq.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. Do you agree?
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(Y)es/(N)o: Y

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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: Y
Account registered.

Which names would you like to activate HTTPS for?
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1: cloud.shagain.club
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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): 1
Requesting a certificate for cloud.shagain.club
Performing the following challenges:
http-01 challenge for cloud.shagain.club
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/nginx/conf.d/cloud.shagain.club.conf
Redirecting all traffic on port 80 to ssl in /etc/nginx/conf.d/cloud.shagain.club.conf

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Congratulations! You have successfully enabled https://cloud.shagain.club
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Subscribe to the EFF mailing list (email: 108963@qq.com).

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/cloud.shagain.club/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/cloud.shagain.club/privkey.pem
   Your cert will expire on 2021-03-10. 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"
 - 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

这是开启自动续期证书的过程

root@localhost:/www/cloud.shagain.club# certbot renew --dry-run
Saving debug log to /var/log/letsencrypt/letsencrypt.log

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Processing /etc/letsencrypt/renewal/cloud.shagain.club.conf
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Cert not due for renewal, but simulating renewal for dry run
Plugins selected: Authenticator nginx, Installer nginx
Account registered.
Simulating renewal of an existing certificate for cloud.shagain.club
Performing the following challenges:
http-01 challenge for cloud.shagain.club
Waiting for verification...
Cleaning up challenges

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new certificate deployed with reload of nginx server; fullchain is
/etc/letsencrypt/live/cloud.shagain.club/fullchain.pem
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** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates below have not been saved.)

Congratulations, all renewals succeeded. The following certs have been renewed:
  /etc/letsencrypt/live/cloud.shagain.club/fullchain.pem (success)
** DRY RUN: simulating 'certbot renew' close to cert expiry
**          (The test certificates above have not been saved.)
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到这里就完结了全手动