CakePHP Maintenance Mode is to put your website in maintenance mode while you do your upgrade. Most ppl would add a static file on the server and route all request to it during maintenance. The file is shown to everybody including you unless a rewrite rule or expressions is added to exclude yourself which would complicate the matter.

This filter file would tell CakePHP to put all requests to maintenance mode i.e show a msg but would allow requests from your IPs to be processed normally.

##Requirement CakePHP 2.*

[Using Composer]

View on Packagist, and copy the JSON snippet for the latest version into your project's composer.json. Eg, v. 1.2.0 would look like this:

{
	"require": {
		"awebdeveloper/cakephp-maintenance-mode": "1.2.0"
	}
}

Because this plugin has the type cakephp-plugin set in it's own composer.json, composer knows to install it inside your /Plugin directory, rather than in the usual vendor directory. It is recommended that you add /Plugin/MaintenanceMode to your .gitignore file. (Why? Read this.)

[Manual]

• Download this: http://github.com/awebdeveloper/cakephp-maintenance-mode/zipball/master
• Unzip that download.
• Copy the resulting folder to app/Plugin
• Rename the folder you just copied to MaintenanceMode

[GIT Submodule]

In your app directory type:

git submodule add -b master git://github.com/awebdeveloper/cakephp-maintenance-mode.git Plugin/MaintenanceMode
git submodule init
git submodule update

[GIT Clone]

In your Plugin directory type:

git clone -b master git://github.com/awebdeveloper/cakephp-maintenance-mode.git MaintenanceMode

In your Bootstrap.php add

Configure::write('MaintenanceMode', array(
	'enabled' => true,
	'view' =>	array(
		'layout' => '',
		'template' => 'MaintenanceMode/index'
	),
	'ip_filters' => array('127.0.*.*')
));

Also in the same file find the below code and add this line

Configure::write('Dispatcher.filters', array(
    'AssetDispatcher',
    'CacheDispatcher',
    'MaintenanceMode.MaintenanceMode' ## this line 
));

It supports Following Parameters

1. enabled set this to true to enable it

2. view this is a array that accepts the template and the layout. If layout key is absent it will use the default layout.

   	'view' =>	array(
   		'template' => 'Pages/index'
   	),
   

   or

   	'view' =>	array(
    		'layout' => 'main',
   		'template' => 'MaintenanceMode/index'
   	),
   

3. ip_filters this is either a string containing a single IP or an array containing multiple IPs for which maintainance mode will NOT be applied.

   	'ip_filters' => array('127.0.*.*','201.201.201.1')
   

   or

   	'ip_filters' => '201.201.201.1'
   

For info read the docs on dispatch filter

http://book.cakephp.org/2.0/en/development/dispatch-filters.html