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....

• MagenX: devdocs.magento.com/guides/v2.3/config-guide/varnish/…

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

• Aji: If i don't add these lines in env.php, then Varnish cache won't work as expected in Magento Right ?
• Muhammad Hasham: It is because If you want to flush the Varnish cache from the Magento backend, you need to add the Varnish server in your Magento config to http-cache-hosts.
• Ivan Augusto: Related official docs quick access: experienceleague.adobe.com/en/docs/commerce-operations/…

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