How to Implement "Maintenance Mode" on Already Established Website

How to implement Maintenance Mode on already established website

You can use .htaccess to redirect to another page while on Maintenance Mode.

Three assorted examples:

RewriteEngine On
RewriteBase /
RewriteCond %{REMOTE_ADDR} !^11\.111\.111\.111
RewriteCond %{REQUEST_URI} !^/maintenance\.html$
RewriteRule ^(.*)$ http://domain.com/maintenance.html [R=307,L]

.htaccess “Down For Maintenance” Page Redirect

Options +FollowSymlinks
RewriteEngine on
RewriteCond %{REQUEST_URI} !/maintenance.html$ 
RewriteCond %{REMOTE_HOST} !^888\.888\.888\.888

RewriteRule $ /maintenance.html [R=302,L] 

Redirect to maintenance page during upgrade using .htaccess

# redirect all visitors to alternate site but retain full access for you
ErrorDocument 403 http://www.alternate-site.com
Order deny,allow
Deny from all
Allow from 99.88.77.66

Maintenance mode for apache

how to set maintenance mode for entire website with htaccess

i find out an blog that contains answer for your question please check this site

The below examples are taken from the above mentioned site.

If you don’t already have an .htaccess file in the root of your
domain, create one and add the following code. If you already have an
.htaccess file, add the following code in front of everything that
might be in there

RewriteEngine On

# Add all the IP addresses of people that are helping in development
# and need to be able to get past the maintenance mode.
# One might call this the 'allow people list'
RewriteCond %{REMOTE_HOST} !^83\.101\.79\.62
RewriteCond %{REMOTE_HOST} !^91\.181\.207\.191

# Make sure the maintenance mode only applies to this domain
# Example: I am hosting different sites on my server
# which could be affected by these rules.
RewriteCond %{HTTP_HOST} ^nocreativity.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.nocreativity.com$

# This is the 'ignore file list'. It allows access to all
# files that are needed to display the maintenance mode page.
# Example: pages, css files, js files, images, anything.
# IMPORTANT: If you don't do this properly, visitors will end up with
# endless redirect loops in their browser.
RewriteCond %{REQUEST_URI} !/offline\.htm$
RewriteCond %{REQUEST_URI} !/css\/style\.css$
RewriteCond %{REQUEST_URI} !/images\/logo\.png$

# Rewrite whatever request is coming in to the maintenance mode page
# The R=302 tells browsers (and search engines) that this
# redirect is only temporarily.
# L stops any other rules below this from executing whenever somebody is redirected.
RewriteRule \.*$ /offline.htm [R=302,L]

How to put an asp.net application into offlince/maintenance mode?

This is the answer to your question:
http://www.codeproject.com/Tips/219637/Put-the-website-in-Maintanance-Mode-Under-Construc

How to put a React app in maintenance mode

You can create a component that will have the content to show when the application is in maintenance mode, and use it as the only component to be rendered in case of maintenance else other/normal behavior components. codesandbox-demo

How to use a maintenance.php file inside a WordPress theme?

When WordPress goes into maintenance mode, it adds a file named .maintenance to the root directory while the maintenance is being performed, then it's removed afterwards. You can write a function inside your theme's functions.php that checks for this file and loads a custom maintenance page from the theme.

if ( ! function_exists( 'wpse84987_maintenance_mode' ) ) {
    function wpse84987_maintenance_mode() {
        if ( file_exists( ABSPATH . '.maintenance' ) ) {
            include_once get_stylesheet_directory() . '/maintenance.php';
            die();
        }
    }
    add_action( 'wp', 'wpse84987_maintenance_mode' );
}

Put your maintenance content in the maintenance.php page inside your theme folder and you're all set to style it however you would like.

If you use the wp_die function, you'll get the standard white box on grey background. This way lets you style your maintenance page like you would any other theme page.

You can also do this outside the theme by adding maintenance.php to the wp-content directory (or wherever you've set WP_CONTENT_DIR to point to) as a drop-in plugin. When WP checks for maintenance mode from inside wp_maintenance() it'll look for that file and load it if present, or load its own if not. If the site isn't in maintenance mode, or is in it for more than 10 minutes, 'maintenance.php' won't load even though the site is technically still in maintenance mode. WordPress 4.6 introduces the 'enable_maintenance_mode' filter, which can be (ab)used by a tool like wp-cli to force the check for the drop-in and would let you run a CLI command from your maintenance file.

With Wordpress in Maintenance Mode, how do we exclude the wp-login.php page?

Using $wp->request you should be able to add an exclusion for the wp-login page to your if(!is_user_logged_in() && !is_admin()) { statement to prevent the code from loading there.

You also need to use home_url( $wp-request ) inside a function call. The code for this would be like this here:

add_action('pre_get_posts', 'maintenance_mode_logic');
function maintenance_mode_logic() {
    global $wp;
    $config = get_field('website', 'option');
    if($config["status"] == 1) {
        //echo 'hello';
        //exit();
        add_filter( 'wp_die_handler', '_custom_wp_die_handler' );
    }else {
        if(!is_user_logged_in() && !is_admin() && home_url( $wp->request ) != wp_login_url()) {
            maintenance_mode();
        }
     
    }
}

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