CentOS tutorial - IT technology blog
Posted inCentos

How to Install and Configure Squid Proxy Server on CentOS Stream 9: Controlling Internet Access for Enterprise Networks with SELinux and firewalld

A complete guide to installing and configuring Squid Proxy Server on CentOS Stream 9 to control Internet access in an enterprise internal network. Covers ACL configuration for blocking websites by domain and working hours, handling SELinux policy, opening ports with firewalld, and practical monitoring and debugging commands.
CentOS tutorial - IT technology blog
Posted inCentos

Production-Ready KVM/QEMU Setup on CentOS Stream 9: Bridge Network, SELinux, and firewalld Done Right

A default KVM setup is easy — but production requires more. This article focuses on three commonly overlooked areas: bridge networking with nmcli instead of the default NAT, proper SELinux context configuration instead of disabling it, and firewalld FORWARD rules to get VM traffic working. Includes remote Virt-Manager management over SSH and troubleshooting common errors.
Fedora tutorial - IT technology blog
Posted inFedora

Installing and Configuring MariaDB on Fedora Server: Production Database Deployment with SELinux and firewalld

A complete guide to getting MariaDB production-ready on Fedora Server: securing the installation with mysql_secure_installation, opening ports correctly with firewalld rich rules, handling SELinux context for custom datadirs, and debugging refused connections. Includes basic performance tuning and a final production checklist.