If you’re like me, you probably just fly through the Magento 2 installation, without actually reading anything. Usually, this is not an issue (especially if you’ve done it several times), but recently Magento has an addition with creating an administration url.
What this means is that administration is no more placed under domain_name/admin. Instead, it has a random
string attached to it, like domain_name/admin_random_string. So if, at the end of installation, you’re banging your head
at the table cursing yourself for being so “confident”, fear not. There is a simple way to change/find out the real url.
Open the app/etc/env.php file, and change the “frontname” key value to admin.
That’s it. Cheers.