Freaks City

A module is the smallest structural building block in Verilog. By nesting and reusing modules, a designer can climb from primitive gates to full-blown digital systems while preserving a clean, hierarchical view. The module’s port list plays the same role as copper traces on a PCB: it caries data, control, and clock signals between blocks. Conce ...

A common troubleshooting scenario involves applications, such as Tomcat running in a Docker container, failing to be accessible despite the host port appearing to be bound. This often leads to confusion, especially when one port mapping works while another fails for the same service. Problem Scenario Consider the following Docker commands: doc ...

Firewall Management Check firewall status: systemctl status firewalld Start firewall: systemctl start firewalld List all firewall rules and open ports: firewall-cmd --list-all Open a specific port (e.g., 8080/tcp): firewall-cmd --add-port=8080/tcp --permanent Reload firewall to apply changes: firewall-cmd --reload Verify if a port is open: ...

Changing MySQL Port Number on CentOS 7 When deploying MySQL on a CentOS 7 system, sometimes you need to change the default port number. This article explains how to change the port number of a MySQL database on CentOS 7. Steps 1. Connect to the MySQL Database First, connect to MySQL using the command: mysql -u root -p Enter your password to ac ...