I have a couple of websites on a VPS. I use virtualmin / webmin as adminpanel. Since a couple of days, the sites are getting a white screen. Or, one Magento shop does not show images.
I checked logs and the images problem and found out that there was a memory allocation issue. The server has 2gb ram memory and it never gets above 1,5gb usage. Most of the time it stays under the 1GB.
I checked php.ini configuratie (virtualmin > services > php5 configuration) and there is a setting 'memory_limit'. I changed that to 512 to try, and saved the config. Then I reloaded the website and everything worked fine.
However, 2 hours later, the sites were not working again. So I checked again, but the setting was still 512M. Then I re-saved the settings and reloaded the website, and again everything was working.
Last but not least, I even tried setting the ram to 128M, just to try and everything worked after saving. But like 2 hours later, it wasn`t working anymore.
I know this storie might sound very strange.. I have no idea how to fix this. Any idea what`s going on, what might be causing this issue?
Many thanks in advance!