Blog - Page 5 - PQ.Hosting

Mar 06, 2026

Linux Routing Configuration: ip route, Persistent Routes, and Network Diagnostics

A practical guide to Linux routing: reading the routing table, adding persistent routes across distros, and setting up dual-ISP policy routing.

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Mar 05, 2026

The cp Command in Linux: Copying Files and Directories with Permissions and Metadata

cp flags -r, -p, -u, -n, -i, -d — recursive copying, preserving permissions and timestamps, copying only newer files, overwrite protection, and handling symbolic links.

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Mar 04, 2026

Nginx 404 Error: Causes and Step-by-Step Fix — root, try_files, Permissions, Redirects

Why Nginx returns 404 and how to fix it: wrong root path, missing try_files for SPA and CMS, PHP-FPM socket issues, file permissions, and setting up a custom error page.

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Mar 04, 2026

Linux File Permissions: ls -l, chmod, chown, and Special Bits

How to read the ls -l permission string, numeric octal permissions, changing with chmod and chown, setuid, setgid, and sticky bit — with examples and a common permission combinations table.

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Mar 04, 2026

ARP Scanning a Local Network in Linux: arp-scan, nmap, and ARP Spoofing Detection

Scanning the local network with arp-scan and nmap, finding the interface via ip addr, reading MAC vendor output, detecting ARP conflicts, and monitoring changes with arpwatch.

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Mar 04, 2026

How to Connect to a Docker Container: exec, attach, logs, and Debugging Without a Shell

docker exec, attach, and run -it — differences and when to use each. Connecting to distroless containers via nsenter, copying files with docker cp, reading logs without entering.

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Mar 03, 2026

How to Unmount a Disk in Linux: umount, target is busy Error, and Force Unmount

umount by mount point and device name, diagnosing a busy disk with fuser and lsof, lazy and force unmount flags, safely ejecting USB via udisksctl power-off.

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Mar 03, 2026

How to Increase LVM Disk Size on Proxmox VE: GUI, CLI, and Filesystem Expansion

Step-by-step LVM disk expansion on Proxmox: qm resize on the host, growpart for the partition inside the VM, resize2fs and xfs_growfs — with commands for ext4, xfs, and nested LVM

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Mar 03, 2026

How to Save a File in nano: Ctrl+O, Permissions, and Common Errors

Saving in nano with Ctrl+O and Ctrl+X, saving without write permissions via sudo tee, diagnosing Permission denied and No space left on device errors.

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