Posted on in system_administration
This guide is based on practical notes taken while tuning DRBD (Distributed Replicated Block Device) on a Linux system. DRBD is a software-based, shared-nothing, replicated storage solution for mirroring the content of block devices (hard disks, partitions, logical volumes, etc.) between servers. Proper tuning of DRBD can significantly improve performance …
Posted on in system_administration
DRBD, which stands for Distributed Replicated Block Device, is a software-based, shared-nothing, replicated storage solution for mirroring the content of block devices (such as hard disks, partitions, logical volumes, etc.) between servers. It is often used to build high-availability (HA) clusters and is integrated into the Linux kernel, making it …
Posted on in programming
Real-time location tracking has become increasingly critical in modern web applications, especially in industries such as logistics, transportation, and personal safety. This functionality allows users to track the movement of objects or individuals live, providing significant value in applications like delivery services, fleet management, and personal …
Posted on in programming
In the world of web development, real-time communication has become increasingly crucial. From live chat applications and online gaming to real-time data streaming and collaborative editing tools, the demand for instantaneous data exchange between clients and servers has surged. WebSockets, a powerful protocol introduced to address this need, enable full-duplex …
Posted on in programming
Milliarcseconds (mas) are a precise angular measurement unit used in astronomy and geodesy, critical for high-precision GPS software. Understanding how to handle milliarcseconds and convert them to degrees is essential for integrating GPS data with applications like Google Maps.
An arcsecond (arcsec) is 1/3600 of a degree …
Posted on in system_administration
To enable RFC 1323 Window Scaling and increase the TCP window size to 1 MB on
FreeBSD, add the following lines to /etc/sysctl.conf and reboot.
net.inet.tcp.rfc1323=1
kern.ipc.maxsockbuf=16777216
net.inet.tcp.sendspace=1048576
net.inet.tcp.recvspace=1048576
You can make these …
Posted on in system_administration
Note: Although this is a continuation of the TCP Performance Tuning article series, it's also valuable as a standalone reference.
This list includes a mix of both well-established and newer algorithms, reflecting the ongoing advancements in TCP congestion control research and deployment. Algorithms like CUBIC and BBR are particularly notable …
Posted on in software
Setting up a Subversion (SVN) repository can be streamlined by using SSH, especially when developers already have system accounts. This method bypasses the complexity of setting up WebDAV with Apache.
Create the Repository:
sudo svnadmin create /var/svn
This command initializes a new …
Posted on in networking
As a network engineer, identifying and mitigating network abuse is a critical task. Cisco's IP cache flow tools can help you detect hosts responsible for generating high volumes of traffic, which is often indicative of abusive behavior such as Denial of Service (DoS) attacks. Here’s an updated guide to …
Posted on in programming
When developing Django applications, you often need to filter and display query results dynamically within your templates. This can involve anything from simple lookups to complex filtering based on multiple conditions. This article provides an in-depth guide on various methods for filtering queries directly within Django templates.
