Fixing CVE-1999-0524 on Red Hat Enterprise Linux
CVE-1999-0524 is an information-disclosure finding: the host responds to ICMP timestamp requests (type 13) with timestamp replies (type 14), which…
End-to-End Monitoring Checklist for PostgreSQL Logical Replication (Publisher + Subscriber)
Logical replication in PostgreSQL is wonderfully flexible — and wonderfully easy to misdiagnose. When something goes wrong, the symptom is…
How to Split a Large PDF Into Smaller Files
Large PDFs are everywhere — scanned contracts, exported reports, e-books, bank statements — and they’re almost always inconvenient. They’re slow…
Most Linux Engineers Understand SSH -L. Here’s Why SSH -R Is Different
Most Linux engineers learn SSH local port forwarding early in their careers. You have a database running on a remote…
pglogical: The PostgreSQL Logical Replication Power Tool — Complete Guide, Cheat Sheet, and FAQ
Part 1 — Article: Understanding pglogical What is pglogical? pglogical is a PostgreSQL extension developed by 2ndQuadrant (now part of…
pg_top: A Real-Time Monitoring Tool for PostgreSQL
pg_top is a real-time monitoring utility for PostgreSQL, similar to the Linux top command. It allows DBAs and database engineers…
How To Change Hostname in Ubuntu
Setting a unique and descriptive identity for your server is one of the first steps in effective system administration. Without…
Understanding the Linux Sticky Bit Permission
In a standard Linux environment, directory permissions can sometimes be counterintuitive. By default, any user with write access to a…
What is the difference between apt-get and the apt command?
The primary difference between apt-get and apt lies in their intended audience and functional design. Both are part of the…
The Multiplier Effect: Mastering PostgreSQL’s work_mem for Complex Queries
In the world of PostgreSQL performance tuning, work_mem is one of the most frequently misunderstood parameters. Many administrators assume it…