使用 Certbot 获取 Let’s Encrypt 证书
## Let’s Encrypt
[https://letsencrypt.org/](https://letsencrypt.org/)
Let’s Encrypt is a free, automated, and open Certificate Authority.
## Certbot
Automatically enable HTTPS on your website with EFF's Certbot, deploying Let's Encrypt certificates.
Install:
On Ubuntu systems, the Certbot team maintains a PPA. Once you add it to your list of repositories all you'll need to do is apt-get the following packages.
```
$ sudo apt-get update
$ sudo apt-get install software-properties-common
$ sudo add-apt-repository ppa:certbot/certbot
$ sudo apt-get update
$ sudo apt-get install python-certbot-nginx
$ sudo certbot --nginx
$ sudo certbot renew --dry-run #自动更新
```
执行该命令会创建系统级 cron 任务：/etc/cron.d/certbot，会每天检查两次。
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