https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-20-04-ja

https://vpslife.server-memo.net/letsencrypt_nginx/

VPS, WebARENA indigo, Ubuntu20.04, 1vCPU 1G
DDNS Nowで取得したドメインで接続

$ sudo apt update
$ sudo apt upgrade

$ sudo apt install nginx

ubuntu@i-12100000390816:~$ sudo mkdir -p /var/www/hmv.f5.si/html
ubuntu@i-12100000390816:~$ sudo chown -R $USER:$USER /var/www/hmv.f5.si/html
ubuntu@i-12100000390816:~$ sudo chmod -R 755 /var/www/hmv.f5.si
ubuntu@i-12100000390816:~$ vi /var/www/hmv.f5.si/html/index.html
ubuntu@i-12100000390816:~$ sudo ln -s /etc/nginx/sites-available/hmv.f5.si /etc/nginx/sites-enabled/
ubuntu@i-12100000390816:~$

ubuntu@i-12100000390816:~$ cat /etc/nginx/sites-enabled/xxx.f5.si 
server {
        listen 80;
        listen [::]:80;

        root /var/www/xxx.f5.si/html;
        index index.html index.htm index.nginx-debian.html;

        server_name xxx.f5.si www.hmv.f5.si;

        location / {
                try_files $uri $uri/ =404;
        }
}
ubuntu@i-12100000390816:~$ 

SSL証明書

sudo apt install certbot python3-certbot-nginx