How query cache can cause performance problems?
How query cache can cause performance problems? Whenever query cache is enabled, any query executed has to access it for one reason or another. For example, the text of a…
How to upgrade MariaDB in Plesk CentOS 7
CentOS 7 already comes with MariaDB but the version is older. You may need to upgrade it to latest version so that your magento and other scripts can work properly.…
nconf stopped working after update to nagios 4
I recently updated our nagios monitoring system from Nagios 3 to Nagios 4 and nconf started giving below error when I generate the new configuration files. Error: Service has no…
How to check if the disk is SSD?
Most of the data centers and hosting providers are now offering SSD (Solid-state drive). If you run the fdisk command to check the drives it's still going to show as…
Varnish: VCL version declaration missing Update your VCL to Version 4 syntax
Today I installed latest version of varnish on a new server and configured it manually. I tried to start it but it was failing. So I did a configuration file…
How to install VIRTUALIZOR on OVH Servers
OVH provide dedicated servers with their own customized kernels. Also the loaded disk partitions too will look odd to you. Now if you directly run the virtualizor installation script then…
ModSecurity: Multipart parsing error: Multipart: Failed to create file: /root/tmp/
We rebuild the Apache with modsecurity 2.7.3 on one of the server. But for some reason all file uploads to the server started failing with "500 Internal Server Error". And…
Create SUDO user in cPanel
For security you might want to disable direct SSH login as root. First of all login as root and create an user which useradd sshadmin passwd sshadmin Now add this…
Basics of Linux Server Management
Linux server management is considered to be a complex task and costs lots of money. It's true if you are big company with large online database of clients. You will…
How to upgrade OpenSSH on CentOS 5
If want your server to pass the PCI DSS scan then you will need the latest version OpenSSH. But the CentOS 5 repos doesn't contain the latest version of OpenSSH.…