無料のSSL証明書 Let's Encryptを使用してPythonでHTTPS通信してみた

sudo apt-get update
sudo apt-get install certbot #ポート80を開ける (もちろんルーターも)
sudo ufw allow 80
sudo certbot certonly --standalone -d 自分のDNS

ModuleNotFoundError: No module named 'symbol'

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python3.9
sudo apt install python3.9-distutils

sudo apt-get install python3.9-venv
python3.9 -m venv venv
source venv/bin/activate
pip install cryptography
pip install certbot

sudo ./venv/bin/certbot certonly --standalone -d 自分のDNS

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Enter email address (used for urgent renewal and security notices)
 (Enter 'c' to cancel): 自分のメアド

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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.4-April-3-2024.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.
Requesting a certificate for 自分のDNS

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Could not bind TCP port 80 because it is already in use by another process on
this system (such as a web server). Please stop the program in question and then
try again.
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(R)etry/(C)ancel: 

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for 自分のDNS

Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/自分のDNS/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/自分のDNS/privkey.pem
This certificate expires on 2024-11-26.
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

$systemctl list-timers | grep certbot
Fri 2024-09-06 08:33:35 JST 8h left       Thu 2024-09-05 13:15:02 JST 11h ago    certbot.timer                  certbot.service

$ sudo systemctl stop certbot.timer
$ sudo systemctl disable certbot.timer