Freaks City

Handling Standard Signals #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> void signal_handler(int sig_num) { if (sig_num == SIGINT) { printf("Ctrl+C signal received\n"); } } int main(void) { // Set SIGINT to be ignored if (signal(SIGINT, SIG_IGN) == SIG_E ...

System Prerequisites Before installing Jenkins, ensure your Linux environment has the necessary Java Runtime Environment (JRE) or Java Development Kit (JDK). Modern versions of Jenkins (starting from 2.357 and LTS 2.361.1) require Java 11 or Java 17. Installing JDK 17 The following script automates the download and configuration of OpenJDK 17. ...

Managing Linux Server Power States Linux servers offer multiple command-line options for shutting down and restarting the system. While cloud management consoles provide graphical interfaces, experienced administrators typically prefer terminal commands for faster and more precise control. shutdown Command The shutdown utility provides comprehe ...

Resetting Network Interface Rules To properly configure network interfaces for cloned virtual machines, you'll need to clear and regenerate the udev persistent network rules: # Clear existing network rules # rm -f /etc/udev/rules.d/70-persistent-net.rules # Reload network module # rmmod e1000 && modprobe e1000 KVM Virtualization Inst ...

Introduction Recently, I implemented a UDP packet processing feature using Netty for statistical analysis of business data. Since Netty's default UDP handling relies on a single thread, unlike TCP's master-slave reactor model that supports multi-threading, I explored whether there were performance optimization techniques available for UDP packe ...

Install System Dependencies Update the system and install required development libraries and tools: yum -y update yum -y install gcc openssl-devel zlib-devel readline-devel libffi-devel bzip2-devel mysql-devel python-devel java wget git redis nginx supervisor Enable services to start automatically after a reboot: syst ...

Monitoring Fundamentals 1. Hardware Monitoring Inspects data center equipment, remote management cards, and IPMI. 2. System Monitoring CPU Load: Use uptime (target < 3), top (ideal 30%-70%), vmstat, mpstat. Memory: Use free -m (utilization should be < 80%). Disk: Use df, iotop (for I/O process monitoring), iostat. Network: Use iftop -n. ...

This guide outlines the process of installing MySQL 8 by compiling its source code on a CentOS 7 system. Source compilation provides maximum control over the installation and optimization. 1. System Environment Overview Before beginning, verify the operating system details. The instructions are tailored for CentOS 7. [root@host ~]# cat /etc/red ...

Working Directory Navigation Use pwd to output the absolute path of the active terminal session. Directory traversal relies on cd. Common navigation patterns include: cd /var/log: Absolute path navigation. cd logs/: Relative path to a subdirectory. cd ~ or cd: Return to the home directory. cd ~admin: Jump to another specific user's home (requi ...

OpenWrt is a highly extensible, Linux-based operating system tailored for embedded networking devices. Unlike vendor-supplied firmware, it offers a fully writable filesystem and a package management system, allowing users to customize their devices extensively. This guide outlines the process of setting up a build environment and compiling a cu ...