Prestashop 1.7.5.1

[ELISABORTOLATO]

I am getting the below error after doing an upgrade when trying to log in to the BO. 

The front end shows a 500 error.

Initially I did the upgrade using 1click upgrade and that broke the site with a 500 error. I then tried to do an upgrade using Plesk and recieved the below. 

Can anyone please help?  

 

 

[PrestaShopException]

Link to database cannot be established:SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known
at line 102 in file classes/db/DbPDO.php

97.     public function connect()
98.     {
99.         try {
100.             $this->link = $this->_getPDO($this->server, $this->user, $this->password, $this->database, 5);
101.         } catch (PDOException $e) {
102.             throw new PrestaShopException('Link to database cannot be established:'.$e->getMessage());
103.         }
104. 
105.         // UTF-8 support
106.         if ($this->link->exec('SET NAMES \'utf8\'') === false) {
107.             throw new PrestaShopException('PrestaShop Fatal error: no utf-8 support. Please check your server configuration.');

• DbPDOCore->connect - [line 323 - classes/db/Db.php]
• DbCore->__construct - [line 234 - classes/db/Db.php] - [4 Arguments]
• DbCore::getInstance - [line 48 - config/alias.php]
• pSQL - [line 339 - classes/shop/Shop.php] - [1 Arguments]
• ShopCore::initialize - [line 120 - config/config.inc.php]
• require - [line 43 - admin/index.php] - [1 Arguments]

[eleazar]

This error has been reported on many occasions, but unfortunately until now the developers team was unable to reproduce it, let alone correct it.

I don't know if that helps, but you can try the following:

1. Open /app/config/parameters.php

Change line 4 (first line of the array)

'database_host' => '127.0.0.1',

to

'database_host' => 'localhost',

If the error message reappears you should check if the database settings shown in this file are really the same like before the upgrade.

Notice (If you upgraded from 1.6x): You will find the settings of PrestaShop 1.6 slightly different coded  in /config/settings.inc.php