$ sudo apt-get install nginx

$ sudo su
# vim /etc/nginx/sites-enabled/default

server {
        listen 80 default_server;
        listen [::]:80 default_server;

        location / {
                proxy_pass http://localhost:8080/;
                proxy_set_header Host $host;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection upgrade;
                proxy_set_header Accept-Encoding gzip;
        }
}

# service nginx reload

# curl -fsSL https://code-server.dev/install.sh | sh -s -- --dry-run
# curl -fsSL https://code-server.dev/install.sh | sh

# vim ~/.config/code-server/config.yaml

# code-server

# vim /etc/systeemd/system/code-serever.service

[Unit]
Description=Code Server IDE
After=network.target
[Service]
Type=simple
User=root
WorkingDirectory=/home/ubuntu
Restart=on-failure
RestartSec=10
ExecStart=/usr/lib/code-server /home/ubuntu
StandardOutput=file:/var/log/code-server-output.log
StandardError=file:/var/log/code-server-error.log
[Install]
WantedBy=multi-user.target

# systemctl restart code-server

# systemctl status code-server

# vim /usr/lib/code-server/code-server

-생략-
# ROOT="$(root)"   <- 이 코드를 아래 코드로 바꿔 주세요.
ROOT="/usr/lib/code-server"

# systemctl start code-server
# systemctl enable code-server

# shutdown -r now

server {
        server_name work.sionuu.com;

        location / {
                proxy_pass http://localhost:8080/;
                proxy_set_header Host $host;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection upgrade;
                proxy_set_header Accept-Encoding gzip;
        }
}

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

$ sudo 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): sion@sionuu.com

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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

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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.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(Y)es/(N)o: Y

Which names would you like to activate HTTPS for?
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1: work.sionuu.com
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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
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for work.sionuu.com
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/nginx/sites-enabled/default
Redirecting all traffic on port 80 to ssl in /etc/nginx/sites-enabled/default

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Congratulations! You have successfully enabled https://work.sionuu.com
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Subscribe to the EFF mailing list (email: sion@sionuu.com).

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/work.sionuu.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/work.sionuu.com/privkey.pem
   Your cert will expire on 2021-02-15. 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"
 - 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