Configuración pagina de mantenimiento en NGINX

server {

# listen 80 default_server;

#server_name _;

listen 443 ssl;

server_name www.red-orbita.com red-orbita.com;
ssl_certificate /etc/pki/tls/certs/CertReweb.crt;

ssl_certificate_key /etc/pki/tls/private/ClaveReweb.key;

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

ssl_ciphers HIGH:!aNULL:!MD5;
#charset koi8-r;
#access_log logs/host.access.log main;
# Load configuration files for the default server block.

include /etc/nginx/default.d/*.conf;
location ~ ^/(images/|img/|javascript/|js/|css/|stylesheets/|flash/|media/|static/|favicon.ico) {

allow all;
}
location ~* \.(html|php|htm)$ {
rewrite ^ /index.html permanent;

}

location / {

root /usr/share/nginx/html/maintenance;

index index.html index.htm;

allow all;

}
error_page 300 301 302 303 304 /index2.html;

location = /index2.html {

root /usr/share/nginx/html;

allow all;

}
error_page 404 /index.html;

location = /index.html {

root /usr/share/nginx/html;

allow all;

}
# redirect server error pages to the static page /50x.html

#

error_page 500 502 503 504 /index.html;

location = index.html {

root /usr/share/nginx/html;

allow all;

}
error_page 300 301 302 303 304 /index.html;

root /usr/share/nginx/html;
}