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$ wget https://dl.eff.org/certbot-auto
$ sudo mv certbot-auto /usr/local/bin/certbot-auto
$ sudo chown root /usr/local/bin/certbot-auto
$ sudo chmod 0755 /usr/local/bin/certbot-auto

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certbot-auto --server https://acme-v02.api.letsencrypt.org/directory -d "*.artacode.com" -d "artacode.com" --manual --preferred-challenges dns-01 certonly
//这里多加了一个 `-d "artacode.com"` 是因为 `-d "*.artacode.com"` 不包含 artacode.com

1. 填写接受通知的邮箱
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): test@test.com

2. 同意协议
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(A)gree/(C)ancel: (A)gree/(C)ancel: a

3. 同意证书服务器记录本机IP
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.

Are you OK with your IP being logged?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(Y)es/(N)o: y

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
4. 设置域名解析
Please deploy a DNS TXT record under the name
_acme-challenge.artacode.cn with the following value:

xxxxxxxxxxxxxx

Before continuing, verify the record is deployed.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Press Enter to Continue 回车继续

5. 生成证书成功
Waiting for verification...


Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/artacode.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/artacode.com/privkey.pem
   Your cert will expire on 2019-11-01. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again. To non-interactively renew *all* of your certificates, run
   "certbot-auto 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

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server {
    server_name xx.artacode.com;
    listen 443 http2 ssl;
    ssl_certificate /path/.acme.sh/domain/fullchain.cer;
    ssl_certificate_key /path/.acme.sh/domain/domain.key;
    ssl_trusted_certificate  /path/.acme.sh/domain/ca.cer;
}