buy and sell        server {
    listen xxx.xxx.xxx.xxx:80;
    server_name www.domain.com domain.com;
    return 301 https://www.domain.com$request_uri;
}
server {
    listen  xxx.xxx.xxx.xxx:443 ssl;
    server_name domain.com www.domain.com;
    root /var/www/www.domain.com/html;
    index index.php;
    ssl_certificate /etc/letsencrypt/live/domain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/domain.com/privkey.pem;
    include /etc/nginx/confs/wordpress.conf;
    include /etc/nginx/confs/cache.conf;
    include /etc/nginx/confs/ssh.conf;
    include /etc/nginx/confs/all.conf;
}service mysql stop   
или 
/etc/init.d/mysql stop