cluster_nginx.conf

upstream server-web-hosts {
        least_conn;
        server server_1:80;
        server server_2:80;
        server server_3:80;
}

server {
        listen 443 ssl;
        server_name server_name;
        ssl_certificate         /etc/ssl/private/server_name/cert.crt;
        ssl_certificate_key     /etc/ssl/private/server_name/cert.key;
        location / {
            proxy_pass  http://server-web-hosts;
            proxy_set_header Host $http_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto https;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_http_version 1.1;
            proxy_redirect    off;
        }
}