Question

Problems with MySQL on Ubuntu Server

  • Posted on February 5, 2015
  • InsigniaAsked by Insignia

Hello! We’ve working with an Ubuntu server, currently once or twice a day the server goes down, once I check and restart the mysql service it works again

Checking the mysql logs I see this:

150205 12:49:07 InnoDB: Initializing buffer pool, size = 128.0M InnoDB: mmap(137363456 bytes) failed; errno 12 150205 12:49:07 InnoDB: Completed initialization of buffer pool 150205 12:49:07 InnoDB: Fatal error: cannot allocate memory for the buffer pool 150205 12:49:07 [ERROR] Plugin ‘InnoDB’ init function returned error. 150205 12:49:07 [ERROR] Plugin ‘InnoDB’ registration as a STORAGE ENGINE failed. 150205 12:49:07 [ERROR] Unknown/unsupported storage engine: InnoDB 150205 12:49:07 [ERROR] Aborting

If I get this well, this means the server runs out of memory? Currently we have 512 MB of Ram and the server hosts a Symfony 2 webpage and a WordPress blog

I’ve done some research but I don’t know what to do

Any help would be appreciated

Thanks!


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Hello there,

The server is running out of memory and adding a SWAP file can benefit the performance before upgrading the RAM of the droplet. You can check our tutorial on How to add swap space on Ubuntu 22.04

https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-22-04

What you can do is to tweak the MySQL configuration using 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/

Hope that this helps!

Yep. Out of memory. Provision a larger VM or add some swap.