Programster's Blog

Tutorials focusing on Linux, programming, and open-source

PostgreSQL - Numeric Types

A cheatsheet for the numeric types that one can use in PostgreSQL

PostgreSQL - Generated Columns

Learn about generated columns in PostgreSQL. These may be referred to as "computed", "calculated" or "virtual" columns in other relational database systems.

Firefox - Compact Mode

Enable compact density in Firefox.

Bitbucket Pipeline Cheatsheet

A cheatsheet for Bitbucket pipelines.

Ubuntu 22 - Install Docker

Install docker engine on Ubuntu 22.04

Create Ubuntu 22.04 KVM Guest From Cloud Image

Create an Ubuntu 22.04 KVM guest through the use of the cloud image provided by Canonical.

Debian/Ubuntu - Start OpenVPN Connection

Learn how to start an OpenVPN connection from the CLI in Debian/Ubuntu.

Verifying AWS Cognito OIDC ID Token

Learn how to verify and decode your OIDC ID token from Amazon Cognito.


Lecture - 100 Percent Stateless with JWT

Learn about JWTs from a lecture Hubert Sablonnière gave in 2016 at Devoxx.

Check Why Email Failed SpamAssassin Check

Find out how to discover why an email went into your spam folder, when you are using SpamAssassin.

Nftables Cheatsheet

A cheatsheet for using nftables.

Resolving Port Forwarding Issue With pfSense

Resolving a port forwarding issue with pfSense when one is running a setup behind another NAT.

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