Determining if a subnet contains a given IP is a fundamental operation in networking. Router dataplanes spend all of their time looking up prefix matches to make forwarding decisions, but even higher layers of application code need to perform this operation.

These hidden features and shortcuts will help you perform some of the most common Bash functions more efficiently.

How to Speak to Computers, Pre-Siri

SCP? It’s that handy file-transfer feature of SSH, right? Well, not quite. It’s more of a hack. Or an undocumented, unstandardized mashup of two protocols. Let’s look at the exciting (and scary) details

A practical, non-exhaustive guide to some of the common issues you’ll encounter while using Postgres. We’ll go beyond the basic advice of adding indices to your queries using sequential scans. There are also a few extra tips for those using the AWS RDS service

A free book available in both of PDF and Epub. It focus on Michael, the cretor of many database such as Ingress, Postgress, VoltDB, Verticca and his wisdoms, ideals about databases.

systemd is the mother of all processes, responsible for bringing the Linux host up to a state where productive work can be done.

Scott Helme, an expert in Security/Pentest, explains how Certificate Authority works, why root CA is different from normal CA. Because root CA can only be updated on client make it harder to renew it.

Being a solo developer, on a side project, deal with GDPR and don’t have time to read all the GDPR doc. This is the guide for you

They also released part 2 so check it as well.