NGINX locations: performance impact and optimizations

by Danila Vershinin, December 12, 2019

NGINX location and rewrite directives. What are the best practices?


Configure IKEV2 (Strongswan) VPN client in CentOS/RHEL 8 (Gnome GUI)

by Danila Vershinin, December 8, 2019

How to configure a Strongswan (IKEV2) client VPN connection in CentOS/RHEL 8


Fix FirewallD in CentOS 7

by Danila Vershinin, November 17, 2019

Here’s how to fix the FirewallD startup problem in CentOS 7. A permanent fix, not a half solution!


Protect your signup forms from SPAM with NGINX and CleanTalk

by Danila Vershinin, September 6, 2019

Suppose you’re running Mautic on CentOS 7 machine. You’ve created a signup form and placed it on the front page of your website. The form is very simple: an input for an email address and Subscribe button. Bots are hitting it hard. They submit email addresses to your form, your database of subscribers have lots […]


NGINX and phpMyAdmin. When you have to…

by Danila Vershinin, August 18, 2019

The phpMyAdmin is the famous web client for MySQL databases. However, being an open-source product, it is subject to security vulnerabilities. The best thing is not using it at all. All the modern MySQL GUI clients support connecting via SSH tunneling. So you don’t have to open MYSQL port for outside. Neither you expose the […]


DNS caching and beyond, in CentOS/RHEL 7 and 8

by Danila Vershinin, July 21, 2019

Make use of DNS caching on your CentOS/RHEL 7/8 to speed up your server even faster!


FirewallD and trusted IP addresses

by Danila Vershinin, July 10, 2019

How to whitelist IP addresses in FirewallD like a PRO


How to install VirtualBox in CentOS/RHEL 8

by Danila Vershinin, June 22, 2019

1. Install Fedora repos sudo dnf -y install sudo dnf install fed2el-release 2. Install Virtualbox (from upstream Fedora 28 repos) sudo dnfplus install VirtualBox 3. Install kernel-abi-whitelists sudo dnf install kernel-abi-whitelists 4. Build necessary modules akmods; systemctl restart systemd-modules-load.service 5. Rebuild modules automatically You can enable service to automatically rebuild VirtualBox required kernel modules, […]


How to enable Intel hardware acceleration for video playback in CentOS/RHEL 8

by Danila Vershinin, June 21, 2019

Performance doesn’t end in fast loading websites. How to leverage Intel hardware video acceleration for playing those dreamy 4K Youtube videos.


RHEL 8 machine as AirPlay receiver

by Danila Vershinin,

How to use RHEL 8 machine as Airplay target