Question

Slow server, mysql crashes

Posted August 24, 2014 4.2k views

I have 2 wordpress sites on a 1G RAM server with zero visitors. I had to take this plan because like many, I had issues with MySQL crashing when no one other than me was on the wordpress sites. They also both of the sites have like 50 posts the most. Tried everything they said on tutorials for how to fixed it, in the end only 1G Ram was the sollution. Not happy with that.

The sites haven’t change for over a month and my main site was about to go live these days and sudenly it take 20sec to load! My code pass on gtmetrix 96% and 98% google gives it also great great ratings. I thought the problem could be with cloudhost dns servers but when I made ping test I got respond from 1ms to 126ms. So is it possible without changes on code and with bigger hosing plan I have suddenly 20sec loading time.

Do you have an idea?

4 comments
  • could provide mysql log right after it crash?

  • There are a few things to investigate here.

    First you can create a virtualhost with a static site and content as a test file to see how quickly that loads.

    You can also use a domain for it or a subdomain so you can test DNS resolution to see if that’s the culprit.

    If both of those work fine then it’s safe to say that it’s something related to Wordpress and how its running that’s slowing things down, so providing more information on your load avgs, memory consumption, and so forth will help us figure out where the potential problem lies.

  • Also are you running any plugins or custom themes? Sometimes these can be a bit of a resource hog.

  • Hi @moisey

    My server is very slow and I do something followed your suggestion. I create subdomain and only echo phpinfo(), but It is still very slow

    You can see http://db.alogap.com/

    Warning from google.pagespeed
    In our test, your server responded in 8.9 seconds. There are many factors that can slow down your server response time

    My Droplet 2CPU, 2GB RAM

    Please help!

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2 answers

I will recommend you to examine the MySQL error_log as well, because this is likely to give you a more verbose error and point you in the right direction to see what exactly is causing the issue here.

The location of the error_log should be:

/var/log/mysqld.log or /var/log/mysql/error.log

If you’re unable to locate the errorlog in this two locations you can double check your my.cnf file and see if the errorlog is saved somewhere else.

What you can do is to examine the last logged entries in the log using tail

You can use either:

tail -f /var/log/mysqld.log and tail -f /var/log/mysql/error.log

or

tail -n 100 /var/log/mysqld.log and tail -n 100 /var/log/mysql/error.log

You can share the output of the log here so we can have a look.

You can also create a simple bash script to check if MySQL is running and if not to restart it.

#!/bin/bash

# Check if MySQL is running
sudo service mysql status > /dev/null 2>&1

# Restart the MySQL service if it's not running.
if [ $? != 0 ]; then
    sudo service mysql restart
fi

Run this script every 5 minutes using a cron job like this one:

 */5 * * * * /home/user/scripts/monitor.sh > /dev/null 2>&1

Hope that this helps!
Regards,
Alex

Hello, all

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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