configuration for DB connection is absent

Question

 bin/magento setup:upgrade
Cache cleared successfully
File system cleanup:
public_html/var/generation/Composer
public_html/var/generation/Magento
public_html/var/generation/Symfony
The directory 'public_html/var/di/' doesn't exist - skipping cleanup
Updating modules:

  [Magento\Setup\Exception]
  Can't run this operation: configuration for DB connection is absent.

setup:upgrade [--keep-generated] [--magento-init-params="..."]

I'm using Centos 6 64 bit server, Magento version 2.1.0, I thought this error was like the previous error so I asked my hosting provider to solve it by referring to that answer. They rerun the command and its output was:

We saved default values for these options: db-engine, db-model, db-init-statements.

And the issue wasn't solved. I am trying to install nosto-magento2 using composer

Answer 1

well it says that your di folder is not there in the error. delete the var folder and then run php bin/magento setup:di:compile and make sure it creates a di folder inside var. Then run php bin/magento setup:upgrade. Also check your database connection in app/etc/env.php and the permissions on that file.

Look at these lines in env.php and make sure they are correct:

  array (
    'table_prefix' => '',
    'connection' => 
    array (
      'default' => 
      array (
        'host' => 'localhost',
        'dbname' => 'your_dbname',
        'username' => 'your_user',
        'password' => 'your_pass',
        'active' => '1',

Also make sure your user has access to the database.

Update: that means there still is an error with the di file. run these commands:

rm -rf var/di var/generation/ var/cache and var/page_cache
rm -rf pub/static/frontend pub/static/_requirejs/ pub/static/adminhtml
sudo chmod -R 777 var pub lib app/etc
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy

As a sidenote, your env.php should look like this:

<?php
return array (
  'backend' => 
  array (
    'frontName' => 'login',
  ),
  'install' => 
  array (
    'date' => 'Mon, 14 Mar 2016 16:04:24 +0000',
  ),
  'crypt' => 
  array (
    'key' => 'cc1482148f935ef000f4b0c4bc',
  ),
  'session' => 
  array (
    'save' => 'files',
  ),
  'db' => 
  array (
    'table_prefix' => '',
    'connection' => 
    array (
      'default' => 
      array (
        'host' => 'localhost',
        'dbname' => 'db',
        'username' => 'user',
        'password' => 'pass',
        'active' => '1',
      ),
    ),
  ),
  'resource' => 
  array (
    'default_setup' => 
    array (
      'connection' => 'default',
    ),
  ),
  'x-frame-options' => 'SAMEORIGIN',
  'MAGE_MODE' => 'developer',
  'cache_types' => 
  array (
    'config' => 1,
    'layout' => 1,
    'block_html' => 1,
    'collections' => 1,
    'reflection' => 1,
    'db_ddl' => 1,
    'eav' => 1,
    'config_integration' => 1,
    'config_integration_api' => 1,
    'full_page' => 1,
    'translate' => 1,
    'config_webservice' => 1,
    'compiled_config' => 1,
  ),
);