Question

Keep running out of memory, mysql dies

Posted December 24, 2014 5.4k views

My site needs more memory because mysql keeps dying from memory issues (according to syslog). I have a swap file but it doesn’t seem to help. I also have a 1gb droplet – how can I get more memory? Should I resize? Basic wordpress site, ~3000 visits/day

3 comments
  • Have you considered lowering your droplet tier level, then setting up load balancing. Spinning up droplets as needed during high volume traffic. Then destroying them when traffic is low enough to be handled by a single droplet.

  • How big is your swap ??

    Try to reduce the swap down to 512MB if its larger in size, and since its wordpress consider caching, plug ins like W3TC may help lowering the load

  • I have the same problem and tried a number of suggestions, including upgrading to a 1GB droplet, adding a swap file etc.. same problem.

    I ended up creating an account here , transferred a copy of my site and it cleared up the problem, improved the performance dramatically and provided us with 24/7 support. This is one of those things where you get what you pay for.

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2 answers

I had the same issue, with a 2GB droplet size. Tried everything and eventually discovered it was an XML-RPC attack (Wordpress related).

Check this article for help:
How To Protect WordPress from XML-RPC Attacks on Ubuntu 14.04

by Jon Schwenn
WordPress is a popular and powerful CMS (content management system) platform. Its popularity can bring unwanted attention in the form of malicious traffic specially targeted at a WordPress site. There are many instances where a server that has not been protected or optimized could experience issues or errors after receiving a small amount of malicious traffic. This guide will show you how to protect WordPress from XML-RPC attacks on an Ubuntu 14.04 system.

Hello, all

You will most definitely need to upgrade your droplet as you’re running out of memory and your application/website needs more resources in order to continue to operate.

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 a 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/

This was mini tutorial was posted from bobbyiliev in this question in our community: https://www.digitalocean.com/community/questions/how-to-tweak-mysql-mariadb-configuration-for-increased-performance-and-stability

Hope that this helps!
Regards,
Alex

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