VIKHOST Tech Blog
Useful Technical Articles, Notes and Instructions.
How to Fix “No Space Left on Device” on Linux

How to Fix Disk Space Issues on Linux VPS (df no space left on device)

How to Fix Disk Space Issues on Linux VPS
The No space left on deviceБ error on Linux usually appears when you least expect it. A service may refuse to start, log files stop updating, package installations fail, or the system can’t create new files.
In most cases, the first reaction is to run df -h, see a filesystem at 100%, and start deleting files as quickly as possible. Sometimes …

/ Linux
Docker Disk Space Issues on VPS_ Where Your Space Really Goes

Docker Disk Space Issues on VPS and Why Disk Usage Grows So Fast

Docker Disk Space Issues on VPS and Why Disk Usage Grows So Fast
One of the most common surprises after working with Docker on a VPS is how quickly disk space disappears.
You may not deploy many containers, logs look reasonable, and df -h still shows free space — yet Docker suddenly refuses to pull a new image with a familiar error: no space left on device.
These Docker …

/ Linux
How to Fix Kernel Security Check Failure on Windows VPS

Fixing “Kernel Security Check Failure” on Windows VPS: What Causes It and How to Recover Quickly

Fixing “Kernel Security Check Failure” on Windows VPS: What Causes It and How to Recover Quickly
A Windows VPS can run smoothly for months. Updates install without issues, RDP works as expected, and everything behaves predictably. Then one day a blue screen appears — Kernel Security Check Failure, a stop code that says nothing about what actually went wrong.
This error occurs on regular desktop PCs as well, but on …

/ Windows
How to use a VPN on your RDP without disconnecting

How to use a VPN on your RDP without disconnecting

How to use a VPN on your RDP without disconnecting
Many users face the same frustrating issue. You install a VPN on your Windows server, enable it, and your RDP connection drops instantly. Nothing is wrong with the server. The problem is simple: most VPN clients reroute all traffic through their tunnel. When this happens, Windows treats the RDP session as just another outbound stream and pushes it into the …

/ Windows
Searching Text in Linux Files

Searching Text in Linux Files with grep, find, and xargs

Searching Text in Linux Files with grep, find, and xargs
Searching through Linux files is something everyone who works with servers eventually deals with. A few directories can be navigated manually, but once the number of logs, configs, or project files grows, simple scrolling becomes pointless. Commands like grep, find, and xargs turn the mess into something manageable, even pleasant.
If you’re running the commands on a server environment, especially …

/ Linux
How to Use the grep Command in Linux

How to Use the grep Command in Linux (with Practical Examples)

How to Use the grep Command in Linux
The grep command is one of those tools that quietly becomes part of your muscle memory when you work with Linux long enough. At some point you stop thinking about it — you just type grep whenever you need to find something in a file, a folder, or in a stream of output flying across your terminal. It’s fast, lightweight, and, frankly, …

/ Linux
Fix “Failed to Start Network Manager” on Ubuntu 22.04

Fix “Failed to Start Network Manager” on Ubuntu 22.04

Fix “Failed to Start Network Manager” on Ubuntu 22.04
A broken network on a Linux server can feel like losing the keys to your own house. If you’re seeing the error “Failed to Start Network Manager” on Ubuntu 22.04, you’re not alone — and there’s a straightforward fix.
Whether you’re managing Ubuntu locally or on a virtual server like a Linux VPS, this guide walks you through the real causes …

/ Linux
Iptables vs UFW

Iptables vs UFW: How to Manage Firewall on Linux VPS

Iptables vs UFW: How to Manage Firewall on Linux VPS
Every Linux server needs a firewall — it’s the invisible wall that keeps the bad traffic out and your applications safe. Whether you’re running a personal project or managing a production system, knowing how to control network access is essential. Two common tools handle this task: iptables and UFW. Both do the same job — but in very different ways.

/ Linux
err_connection_refused

How to Fix “Connection Refused” Error

How to Fix “Connection Refused” Error
(SSH, Nginx, MySQL, RDP)
The “Connection Refused” error is one of the most frustrating problems for developers and VPS users. It happens when your client — whether it’s SSH, a web browser, or a database tool — tries to reach a server, but the server rejects the request.
Unlike a timeout, which means the server didn’t answer at all, “connection refused” indicates that the …

/ Useful articles
How to Upgrade Debian 12 to Debian 13

Upgrade Debian 12 to Debian 13: Step-by-Step Guide

Upgrade Debian 12 to Debian 13: Step-by-Step Guide
With the release of Debian 13 Trixie in August 2025, system administrators and VPS users get access to a modern Linux kernel, APT 3.0, stronger security defaults, and broader hardware support, including RISC-V. While Debian 12 (Bookworm) is still supported, upgrading ensures long-term stability, better performance, and improved security.
For a complete overview of new features, pros, and cons, read our Debian …

/ Linux

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