Blog - Page 2 - PQ.Hosting

Mar 12, 2026

How to Check Linux for Errors: Logs, Disk, Memory, and Network

Checking Linux for errors — dmesg and journalctl for system logs, smartctl and fsck for disk health, stress-ng for memory, mtr and ip -s link for network issues.

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Mar 12, 2026

Nginx 504 Gateway Timeout: Causes and How to Fix It

How to fix 504 Gateway Timeout in Nginx — fastcgi_read_timeout for php-fpm, proxy_read_timeout for Apache, slow-log for finding slow scripts, and checking php-fpm worker count.

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Mar 12, 2026

The chmod Command in Linux: Symbolic and Numeric Format, SUID, SGID, and Sticky Bit

How to change file permissions in Linux with chmod — beginner examples, numeric masks 755 and 644, recursive directory changes, and special SUID and SGID permissions.

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Mar 12, 2026

How to Check the Nginx Version: nginx -v, curl, apt, and Hiding the Version

All ways to check the Nginx version — nginx -v and -V for build modules, curl via HTTP header, apt and dpkg for package version, and hiding the version with server_tokens off.

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Mar 12, 2026

tmux Sessions: Create, Attach, Detach, and Manage Windows

Complete guide to tmux sessions — create with name, list sessions, attach and detach, rename, kill session, split panes, and sharing a session between two users.

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Mar 12, 2026

How to Extract 7z Archives in Linux: p7zip, 7z, Passwords, and GUI Tools

Extracting 7z archives in Linux with p7zip and 7z — to a specific folder, with password, selective files, creating archives with filename encryption and volume splitting.

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Mar 12, 2026

How to Check File Creation Date in Linux: stat, debugfs, and crtime

Finding file creation date in Linux via stat -c &#039;%w&#039; and debugfs — why the field is empty on Ubuntu 20.04, how to get inode and filesystem device, and a one-liner for quick crtime lookup.

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Mar 12, 2026

How to Restart Network in Ubuntu 20.04 / 22.04 / 24.04: systemctl, netplan, and nmcli

All ways to restart the network in Ubuntu — systemctl, netplan apply, nmcli, ip link for a specific interface, and ifup/ifdown, with tips for working over SSH.

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Mar 12, 2026

The less Command in Linux: File Viewing, Search, and Log Monitoring

How to use less in Linux — navigation, bidirectional search, real-time follow mode with +F, multiple files, and piping command output. Comparison with more and cat.

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