免费域名和证书

sudo apt install certbot

sudo certbot certonly --standalone --preferred-challenges tls-alpn-01 -d mfavant.duckdns.org

root@ser745692301841:~# sudo certbot certonly --standalone --preferred-challenges tls-alpn-01 -d mfavant.duckdns.org
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for mfavant.duckdns.org

Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/mfavant.duckdns.org/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/mfavant.duckdns.org/privkey.pem
This certificate expires on 2026-03-31.
These files will be updated when the certificate renews.
Certbot has set up a scheduled task to automatically renew this certificate in the background.

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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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Certificate is saved at: /etc/letsencrypt/live/mfavant.duckdns.org/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/mfavant.duckdns.org/privkey.pem

root@ser745692301841:~# sudo certbot certificates
Saving debug log to /var/log/letsencrypt/letsencrypt.log

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Found the following certs:
  Certificate Name: mfavant.duckdns.org
    Serial Number: 65636c13491f6f4416dc4e2af0542f36764
    Key Type: ECDSA
    Domains: mfavant.duckdns.org
    Expiry Date: 2026-03-31 06:40:58+00:00 (VALID: 89 days)
    Certificate Path: /etc/letsencrypt/live/mfavant.duckdns.org/fullchain.pem
    Private Key Path: /etc/letsencrypt/live/mfavant.duckdns.org/privkey.pem
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sudo certbot delete --cert-name mfavant.duckdns.org