TOPIC / TAG
Notes in linux
16 articles
A Safe 90-Second Linux Disk Space Triage
A read-only sequence for finding what filled a Linux server before deleting logs, images, caches, or data you may still need.
systemctl cat and Drop-In Overrides
Inspect the complete systemd unit and make a small local override without editing vendor files.
systemd Timers Without the Guesswork
Create a small systemd timer, inspect its next run, and make missed jobs predictable after downtime.
A Calm SSH Host Key Check
Handle an SSH host-key warning without training yourself to delete the evidence and try again.
Reading a Failed systemd Service Without Scrolling Forever
A compact sequence for checking a failed systemd unit, its recent logs, and the exact configuration systemd loaded.
SSH Config Aliases for a Small Fleet
Replace long SSH commands with readable host aliases while keeping usernames, ports, keys, and jump hosts explicit.
Disabling IPv6 on Debian, Ubuntu, and CentOS: A Comprehensive Guide
IPv6 is increasingly being adopted worldwide, but there are situations where disabling IPv6 might be necessary, such as compatibility issues, specific network...
How to Secure Your Linux Server: A Comprehensive Guide
Securing a Linux server is critical for protecting sensitive data and maintaining the integrity and availability of your services. With the rise of cyber...
A Gentle First Pass With journalctl
Start with a narrow journalctl query and widen it deliberately instead of scrolling through the entire system journal.
journalctl Time Ranges That Save Time
Reduce a large systemd journal to the service, boot, time window, and priority that matter to an incident.