Maintenance mode in Magento2

What is Maintenance Mode in Magento2

Maintenance Mode in Magento 2 is a feature that allows administrators to temporarily restrict access to their online store while performing maintenance tasks or making significant changes to the website. When Maintenance Mode is enabled, visitors to the website are presented with a custom maintenance page instead of the regular storefront.

Command to check the Maintenance mode status

We can check whether the maintenance mode is enabled or disabled from the following command in Magento2:

php bin/magento maintenance:status

running the above command output:
Status: maintenance mode is not active
List of exempt IP-addresses: none

This shows that maintenance mode is not enabled on the Magento site.

Command to Enable the Maintenance mode

We can enable the maintenance mode from the following command in Magento2:

php bin/magento maintenance:enable

running the above command output:
Enabled maintenance mode

Command to Enable the Maintenance mode for specific IP addresses

Activating maintenance mode typically applies restrictions to all IP addresses, displaying the maintenance page to all users attempting to access the website.
But there is a situation/requirement that we want to give access to frontend site to the particular user.

For example, if you need to provide access to the website developer during maintenance, you must include their IP address in the allowed list. This allows anyone from the specified IP addresses to access the site despite maintenance mode being active, while other users will encounter the maintenance page.

We can set as many as IP addresses as we want

php bin/magento maintenance:enable --ip=192.168.0.107 --ip=192.168.0.108

the above command output:
Enabled maintenance mode
Set exempt IP-address: 192.168.0.107,192.168.0.108

if you again check the status of the Maintenance mode via command line

php bin/magento maintenance:status

then the output will be:
Status: maintenance mode is active
List of exempt IP-addresses: 192.168.0.107,192.168.0.108

this shows that Maintenance mode is active and only two given IP addresses(192.168.0.107,192.168.0.108) can access the frontend site and the rest users only see the Maintenance page.

Command to remove all IP addresses from the exempt list

php bin/magento maientenace:enable --ip=none

the above command output is:
Enabled maintenance mode
Set exempt IP-addresses: none

means no user from any IP address is allowed to access the frontend of the website.

Command to disable the Maintenance mode

php bin/magento maintenance:disable

the above command output is:

Disabled maintenance mode