#linux
All articles tagged #linux — practical guides from production experience.
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66 posts tagged #linux · page 5 of 8
How to Check DNS Server in Linux: dig, nslookup, resolvectl
Check which DNS server Linux is using with resolvectl, dig, and cat /etc/resolv.conf — verify DNS resolution, test specific servers, and debug DNS configuration.
How to Find Large Files in Linux: Practical Guide
Find large files in Linux using find, du, and ncdu — with real command examples for disk cleanup, log hunting, and storage audits on production servers.
DNS Not Resolving in Linux: Fix Guide
Fix DNS not resolving in Linux — diagnose with dig and nslookup, check resolv.conf and systemd-resolved, and fix DNS for containers, VMs, and production servers.
Disk Full Linux: How to Clean Up and Free Space Fast
Fix a full disk on Linux fast — find what's taking space with df and du, clean logs, Docker, package caches, and deleted-but-open files in production.
How to Compress Files in Linux: tar Examples
Compress files in Linux with tar — create .tar.gz and .tar.bz2 archives, choose the right compression level, and handle common tar use cases with real examples.
How to Check Open Ports in Linux: ss vs netstat
Check open ports in Linux using ss and netstat — with real command examples, output explanation, and when to use each tool in production troubleshooting.
How to Check Network Interface in Linux: ip, ifconfig, ethtool
Check network interfaces in Linux with ip link, ip addr, and ethtool — see IP addresses, interface state, link speed, and diagnose interface-level network problems.
How to Check Listening Ports in Linux (2026 Guide)
Check listening ports in Linux with ss, netstat, lsof, and nmap — know which service owns each port, detect unexpected listeners, and troubleshoot connection refused errors.
How to Check Firewall Status in Linux: iptables, firewalld, ufw
Check firewall status in Linux using iptables, firewalld, and ufw — see active rules, verify port access, and diagnose whether firewall is blocking traffic.