Apache_Maintenance_mode

httpd_maintenance.conf

#メンテナンス切り替えサンプル
ErrorDocument 503 /mainte/index.html

RewriteEngine on
RewriteCond /home/hoge/contents/mainte_mode -f
RewriteCond %{X-Forwarded-For} !^127\.0\.0\.1$
RewriteCond %{REMOTE_ADDR}     !^127\.0\.0\.1$
RewriteCond %{REQUEST_URI}     !^/mainte/.*
RewriteCond %{REQUEST_URI}     !^/srv-status
RewriteRule ^.*$ - [R=503,L]

Alias /mainte /home/hoge/contents/mainte
<Directory "/home/hoge/contents/mainte">
    Options FollowSymLinks
    AllowOverride All
    Order allow,deny
    Allow from all
</Directory>