If you’re running dnsmasq primarily for DNS resolution and don’t need its DHCP server capabilities, you’ll want to disable DHCP while keeping DNS functional. This is a common configuration for DNS-only setups or when another service handles DHCP. Default dnsmasq behavior By default, dnsmasq ships with DHCP disabled. However, many distributions include preconfigured DHCP settings…
Retrieving the hostname of the current system is a common task in systems programming, network applications, and monitoring tools. C++ provides several approaches depending on your platform and requirements. Using gethostname() The most portable approach uses the gethostname() function from <unistd.h>: #include <unistd.h> #include <iostream> #include <cstring> int main() { char hostname[256]; if (gethostname(hostname, sizeof(hostname))…
Go’s os package provides a straightforward function to retrieve the system’s hostname: package main import ( “fmt” “os” ) func main() { hostname, err := os.Hostname() if err != nil { fmt.Println(“Error:”, err) return } fmt.Println(“Hostname:”, hostname) } The os.Hostname() function returns a string containing the hostname and an error value. Always check the error—it…
There are several ways to retrieve the hostname of the current machine in Python, each with different use cases. Using socket.gethostname() The simplest and most common approach is the socket module, which is part of Python’s standard library: import socket hostname = socket.gethostname() print(hostname) This returns the hostname as a string. On most systems, this…
The epoch timestamp (also called Unix time) represents the number of seconds since January 1, 1970, 00:00:00 UTC. PHP provides several straightforward methods to obtain this value. Using time() The simplest approach is the time() function: <?php $timestamp = time(); echo $timestamp; // Output: 1704067200 (example) ?> This returns the current Unix timestamp as an…
The standard sort command is single-threaded by default, which limits performance on modern multi-core systems. Several approaches exist to speed up sorting operations using parallelism. GNU Sort with Parallel Sorting Modern versions of GNU sort (8.23+) include built-in parallel sorting support. Enable it with the –parallel flag: sort –parallel=4 large_file.txt > sorted_output.txt The –parallel option…
After a libvirt upgrade, VMs fail to start with the error: error: Failed to start domain kvm1 error: Network not found: no network with matching name ‘default’ This happens when the default NAT network (virbr0) isn’t automatically created during the upgrade. Quick fix: Restore the default network The fastest solution is to recreate the default…
The default TeX Live packages available through standard repositories are often outdated and incomplete. The official TeX Live installer provides access to current versions and the full package collection, though it requires around 4-5GB of disk space. Prerequisites Before starting, ensure you have the required dependencies installed: sudo yum groupinstall -y “Development Tools” sudo yum…
The most straightforward approach is os.access(), which tests whether the process has the requested access to a file: import os file_path = “example.txt” # Check if file is readable if os.access(file_path, os.R_OK): print(“File is readable”) # Check if file is writable if os.access(file_path, os.W_OK): print(“File is writable”) # Check if file exists and is executable…
VNC (Virtual Network Computing) provides a graphical remote desktop connection to Linux servers. It’s straightforward to set up and useful when you need GUI access to a headless or distant system. Installation On the server side, install a VNC server package. TigerVNC is the most reliable choice across distributions: Debian/Ubuntu: sudo apt install tigervnc-server tigervnc-common…
When you create VMs in KVM, they’re typically assigned IP addresses via DHCP. Finding those addresses so you can SSH in requires a few steps. Here are the practical approaches. Using virsh domiflist and ARP The traditional method combines virsh domiflist to get the VM’s MAC address, then looks it up in the ARP table:…
Configuring multiple static IP addresses on a Xen VM is useful for hosting multiple services, SSL certificates, or failover scenarios. The approach depends on your underlying Linux distribution and whether you’re using traditional network configuration or modern network managers. Using ip Command for Immediate Changes The quickest way to add a secondary IP is with…
NFS squashes root access to an anonymous user (typically nobody) by default as a security measure. When a client connects as root, the server remaps that user to an unprivileged account, preventing root from having unrestricted access to exported shares. This can cause permission issues if your application genuinely requires root-level file operations. Using no_root_squash…
Tethering your iPhone to your computer’s internet connection via USB is useful when you need a stable, low-power connection or want to avoid wireless overhead. This guide covers the practical setup on Windows and how to configure your iPhone to use your PC’s internet. Windows USB Tethering Setup On Windows 10/11: Install iTunes or Apple…
iOS SSH clients have matured significantly, and if you need SOCKS proxy support, there are several solid options worth evaluating. The key difference from desktop clients is that iOS imposes sandbox restrictions, so dynamic forwarding requires apps built with that constraint in mind. vSSH vSSH remains one of the more capable SSH clients for iOS,…
The standard systemctl enable command should work for rpcbind.service, but if you’re seeing it fail to start after reboot, there are several approaches to troubleshoot and fix the issue. Check the Current State First, verify the actual status: systemctl status rpcbind.service systemctl is-enabled rpcbind.service If is-enabled returns disabled, the service wasn’t properly enabled. Check for…
The /etc/sysconfig/network-scripts/ directory contains network configuration files on RHEL and Fedora systems. While newer systems increasingly use NetworkManager and systemd-networkd, understanding ifcfg files remains essential for legacy systems and certain enterprise environments. Basic Static IP Configuration Here’s a typical ifcfg-eth0 file for a static IP setup: DEVICE=eth0 TYPE=Ethernet BOOTPROTO=none ONBOOT=yes IPADDR=192.168.1.151 NETMASK=255.255.0.0 GATEWAY=192.168.1.10 USERCTL=no The…
The TP-LINK T2U is a USB WiFi adapter based on the MediaTek MT7650U chipset. While Linux kernel support has improved significantly, you may still need to manually compile drivers on some distributions. This guide covers installation on modern Fedora and RHEL-based systems. Check if your adapter is already supported First, plug in the adapter and…
Firefox Sync requires an email address and a password to function. The critical question: if someone gains access to your Firefox account or device, can they read your synced passwords without knowing your master password? The short answer: no. Only you with your password can decrypt your synced data. Mozilla’s servers cannot access your encrypted…
When clients connect to your OpenWRT router via DHCP, they typically receive the router itself as the default gateway. Sometimes you need to advertise a different gateway — whether you’re running a proxy, load balancer, or multi-gateway setup on your network. This is done via DHCP option 3 (the router option in the DHCP specification)….