What is the purpose of http_cache_hosts entry in app/etc/env.php?

Question

I have configured Varnish cache in the local Magento 2 environment and It is working fine.

I have added the below lines in the app/etc/env.php file.

'http_cache_hosts' => [
    [
        'host' => '127.0.0.1',
        'port' => '6082'
    ]
]

What is the real purpose of adding this configuration in Magento 2 env.php?

What do these configurations do?

How it affects Magento? Please Help me Out....

Answer 1

To make Magento aware of the Varnish servers, add the following section to app/etc/env.php. For Example:

'http_cache_hosts' =>
  array (
    0 =>
    array (
      'host' => 'varnish-0',
      'port' => '80',
    ),
    1 =>
    array (
      'host' => 'varnish-1',
      'port' => '80',
    ),
  ),

In order to ensure the Varnish cache can be cleared, you must also add a node to your env.php to tell Magento how to communicate with Varnish

I hope this will help

Answer 2

You can also put Varnish hots using bin/magento:

magento setup:config:set --http-cache-hosts=192.0.2.100,192.0.2.155:6081