I recently learned about Cloudflare's 1.1.1.1 DNS service. One of the more interesting things that caught my attention there was DNS over HTTPS. That is, we can do this:

22:27 $ http 'https://cloudflare-dns.com/dns-query?ct=application/dns-json&name=echorand.
me'
HTTP/1.1 200 OK …

Fedora 28 beta was announced recently and I am happy to say Fedora Scientific is back.

One note though, the following applications/libraries are not part of the release:

• networkx
• scilab
• sagemath
• rkward

You can install them on your installation using:

$ sudo dnf install python*-networkx scilab sagemath rkward

The …

In this post, we will see how we can implement the AWS assume role functionality which allows an IAM role to be able to obtain temporary credentials to access a resource otherwise only accessible by another IAM role. We will implement the infrastructure changes using Terraform and see how to …

In my earlier post, Quick and dirty debian packages for your Golang application I shared a recipe building DEB packages for Golang applications. We are going to see the following things in this post building upon our recipe in that post:

• Building the DEB packages in Travis CI
• Publishing the …

At work, I learned about how Right-to-Left Override was being used to make actually malicious files to look harmless. For example, a .exe file was being made to appear as .doc files. We didn't want to allow uploading such files. This meant that I nedded to detect the presence of …

In this post, we will see a demo of sorted sets in redis. I just learned about them and I think they are really cool! This post shows how we can play with sorted sets first via the redis-cli, then from Python and Golang.

                            ┌────────────┐
 .───────────────.          │            │           .─────────────.
(    Redis CLI    )   ───▶  │   Redis    │  ◀─────  (    Golang     )
 `───────────────'          │            │           `─────────────'
                            └────────────┘
                                  ▲
                                  │
                                  │
                           .─────────────.
                          (    Python     )
                           `─────────────'

We …

After a fair number of furious impatient attempts to try and use specific git commits of third party packages in my Python software, I finally have been able to make it work. I went back to the drawing board - basically reading setup-vs-requirement.

Applications

This is what I did:

• If you …

The Freelancer.com REST API is powered by a number of backend services. The API itself is powered by a Python HTTP server which communicates with the other services (Python, Golang and PHP) via RPC calls implemented using Apache Thrift. It is only during the past 2.5 years that …

math.h provides basic mathematical functions as part of the C standard library and are also usable from C++. However, it needs to be supplemented with custom libraries when advanced numerical functionalities are desired. In this article, we shall take a look at two such libraries - the GNU Scientific Library …

In the last two articles (Data in CPython and Data in C), as it turned out, I discussed two fundamental points in each language:

• What happens in an assignment operation (such as a=2)?
• Are separate copies of data created or references passed to the original when they are sent …