Drupal Installation can't connect to MySQL server but it's there

问题

I'm getting the following error installing drupal 7:

Failed to connect to your database server. The server reports the following message: SQLSTATE[HY000] [2003] Can't connect to MySQL server on 'myservername' (13).

I am running MySQL on one windows server and httpd on another linux. MySQL is running just fine and on the httpd server I can connect just fine to the MySQL, as follows:

mysql -h dbserver -p --port=3001 -u drupal

Similarly I can run mysqli and pdo and it connection just fine too from my httpd:

<?php
$servername = "dbserver";
$username = "drupal";
$password = "xxx";
$dbname = "drupal";
$port = 3001;

$conn = new mysqli($servername, $username, $password, $dbname, $port);

if ($conn->connect_error) {
     die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
$conn->close();

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname;port=$port", $username, $password);
    // set the PDO error mode to exception
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo "Connected successfully";
    }
catch(PDOException $e)
    {
    echo "Connection failed: " . $e->getMessage();
    }
$conn=null;
 ?>

So there is nothing wrong on my web server or php or mysql. It's just through the installation that it fails. I've been in the advanced and entered all the correct details.

Any idea? I looked and there was no apache log and I couldn't figure out how to increase error reporting during install or find exactly where it does the database connection check..

thanks.

回答1:

Can you confirm you have dbserver's ip mapped. Go to terminal and type : "ping dbserver" and please post result.

EDITED: This situation was caused by a security policy of the linux distro where the apache server is setup that doesn't allow it to connect to remote mysql instances. For solving this situation go to terminal and type sudo setenforce 0, that way linux won't enforce such strict webserver behaviour.

回答2:

Assuming you're using RHEL/CentOS, I found the answer from @alexbilbie here:

setsebool -P httpd_can_network_connect_db 1

From the RHEL documentation:

When disabled, this Boolean prevents HTTP scripts and modules from initiating a connection to database servers. Enable this Boolean to allow this access.

来源：https://stackoverflow.com/questions/30289566/drupal-installation-cant-connect-to-mysql-server-but-its-there

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