Freaks City

Understanding thread control in Linux requires moving beyond process-centric abstractions to grasp how lightweight execution units share resources while maintaining isolation where needed. Foundational Concepts Threads in Linux are implemented as tasks sharing the same virtual address space but with distinct execution contexts. Key characterist ...

Key Fields in /proc/cpuinfo physical id – unique identifier for each physical processor package (socket). cpu cores – number of physical cores inside one package. processor – logical CPU identifier; every SMT sibling is counted separately. Definitions Term Meaning Physical CPU A real procesor chip that fits into a motherboard socket. ...

Prerequisites for Understanding Processes Von Neumann Architecture Most modern computers, from laptops to servers, follow the Von Neumann architecture. This fundamental hardware structure defines how components interact within a computing system. Key components include: Input devices: keyboards, disks, network cards, graphics cards, microphone ...

Identifying the Connection IssueWhen setting up a fresh MySQL instance on a test server, connection attempts may fail with the following error:ERROR 1130 (HY000): Host 'node-01' is not allowed to connect to this MySQL serverThis indicates that the server's host-based access control does not permit connections from the specific hostname. Since c ...

Overview and Mechanics The sed (stream editor) is a powerful utility designed for parsing and transforming text streams. Unlike interactive editors, it operates automatically based on scripts or command-line arguments. Internally, sed processes input line by line. Each line is copied into a temporary area known as the Pattern Space. The command ...

Firewall Configuration To allow Redis traffic through the firewall, add a rule for port 6379: iptables -I INPUT -p tcp --dport 6379 -j ACCEPT service iptables save Installation Steps Navigate to the download directory: cd /usr/local/src Download the Redis source package (example version 3.2.9): wget http://download.redis.io/releases/red ...

1. Confgiure the Slave Server Install Rsync on the Slave Server [root@slave ~]# rpm -ivh rsync-3.1.2-11.el7_9.x86_64.rpm Configure Rsync on the Slave Server [root@slave ~]# vim /etc/rsyncd.conf log file=/var/log/rsync.log pid file=/var/run/rsyncd.pid [server] path=/root/test use chroot=true max connections=4 read only=no list=true uid=root gi ...

When nginx access logs reach gigabyte scale, utilities like cat or tail become impractical for pinpointing traffic on a specific date. The sed stream editor processes text line-by-line using regular expressions, making it efficient for slicing large log files by timestamp ranges. Log Timestamp Structure A standard nginx access entry places the ...

In Linux, there are several ways to execute commands that continue running even after you close your terminal session: Background execution with &: The ampersand symbol allows a command to run in the background. However, if you close your terminal (like Xshell), the process will terminate. nohup command: This allows a command to keep runni ...

Introduction to LVS LVS (Linux Virtual Server) is an open-source project initiated by Wensong Zhang, primarily designed to achieve load balancing at the Linux kernel level. It enables the creation of a high-availability, high-performance server cluster by distributing client requests among backend servers according to load balancing algorith ...