Question

Error establishing a database connection

Today I have started to see in my website this message “Error establishing a database connection”, so I was investigating and I saw this article related and I have tried to implement it but its not working for me I still getting the same issue and I have no clue why.

Below is what I have implemented from the article:

For Apache on Ubuntu 14.04, edit the configuration file with the following command:

sudo nano /etc/apache2/sites-available/000-default.conf Add the highlighted lines below between the <VirtualHost> tags.

Apache VirtualHost Config <VirtualHost> …
<files xmlrpc.php> order allow,deny deny from all </files> </VirtualHost> Save and close this file when you are finished.

Restart the web server to enable the changes:

sudo service apache2 restart

What is weird is when I restart the droplet the website works for a couple of seconds so… I cant figure out how to fix it.

Droplet details: 512 MB Memory / 20 GB Disk / LON1 - Ubuntu WordPress on 14.04

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Problem solve with this code…

sudo start mysql

have a nice day ! embunhati

Hello all,

This crash is most likely due to your system running out of memory. I’d suggest that you add a swap file to give yourself a bit more of a buffer. Check out this tutorial:

How To Add Swap on Ubuntu 18.04

What you can also do is to use the MySQLTuner script.

The MySQLTuner is a script written in Perl and allows you to quickly test your MySQL configuration and it gives you suggestions for adjustments to increase performance and stability.

According to the official GitHub page, it supports 300 indicators for MySQL/MariaDB/Percona Server in this last version.

To run the script you could do the following:

  • SSH to your Droplet
  • Download the script:
wget http://mysqltuner.pl/ -O mysqltuner.pl
  • Then execute it:
perl mysqltuner.pl

The script would run multiple checks against your MySQL instance, all checks done by MySQLTuner are documented here.

Also as stated in the official documentation, it is still extremely important for you to fully understand each change you make to a MySQL database server. If you don’t understand portions of the script’s output, or if you don’t understand the recommendations, you should consult a knowledgeable DBA or system administrator that you trust.

As a good practice make sure to always test your changes on staging environments before implementing them on your production database.

On the same note, if you want to have worry-free MySQL hosting and focus on your application, I would recommend trying out the DigitalOcean Managed Databases:

https://www.digitalocean.com/products/managed-databases-mysql/

Source: https://www.digitalocean.com/community/questions/how-to-tweak-mysql-mariadb-configuration-for-increased-performance-and-stability

Hope that this helps! Regards, Alex

You might want to verify that you’ve properly blocked requests to xmlrpc.php. You can do that with the following command:

curl -XPOST http://YOUR_DOMAIN/xmlrpc.php

if you see this, you have not blocked requests to xmlrpc.php:

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
  <fault>
    <value>
      <struct>
        <member>
          <name>faultCode</name>
          <value><int>-32700</int></value>
        </member>
        <member>
          <name>faultString</name>
          <value><string>parse error. not well formed</string></value>
        </member>
      </struct>
    </value>
  </fault>
</methodResponse>

Run the following after you start seeing that, and look at the output:

free -m

My bet is it looks something like this:

             total       used       free     shared    buffers     cached
Mem:          512       512        0         256        256       0
-/+ buffers/cache:       256       0
Swap:            0          0          0

If Mem and buffers/cache both show 0 free, you’re overutilizing the server, and need to move to at least a 1GB server.