sys-dev.cat

Restoring original visitor ip with Cloudflare and Nginx

Sat, 10 Mar 2018 00:00:00 +0000

Who doesn’t know Cloudflare yet? Cloudflare is one of the most used CDN (Content Delivery Network) providers in the world. Using a CDN in front of your tipical web server (For example nginx) provides a lot of advantages, like lower response times, increased security by hiding your real server ip address, and in the case of Cloudflare a lot of different features. On the other hand since Cloudflare acts as a reverse proxy some of your apps (Log analyzers, or any other kind of app that requires your visitors ip addresses) might stop working at all since your server won’t be able to get the real ip addresses of your visitors anymore.

Mining Ethereum using Windows 10 and a GTX 1080

Thu, 29 Jun 2017 00:00:00 +0000

If you are into cryptocurrencies probably you already know about Bitcoin. Bitcoin is the first cryptocurrency and the most popular, but it’s not the only one, there are more. Some of them are only simple (and bad) Bitcoin copies, but others are innovating by incorporating new technology like smart contracts, like Ethereum. Nobody knows if those cryptocurrencies are going to prevail in the future as a form of payment, or if they are just speculative investments, but nobody can question that their popularity is rising.

Setting up OpenVPN 2.4 with EasyRSA 3

Sun, 18 Jun 2017 00:00:00 +0000

Nowadays spies are everywhere, governments, ISP, marketing campaigns… they want to make a profit and take advantage of uninformed Internet users. If you want to keep this cat-mouse game of privacy, one of the more basic things you must do is setting up a VPN service for connecting to the Internet. When done all the traffic originated in your devices will be routed through the server, with the additional advantage of having a private lan between all your devices, or for example you will be able to connect securely to open wifi networks without worries of your data being intercepted.

Starting up with libGDX, git and Android Studio

Tue, 14 Mar 2017 00:00:00 +0000

Have you ever dreamed about creating your own video game? Do you have a lot of time? Do you like to torture yourself coding in java and using Android Studio and fancy frameworks? If the answer to all these questions is yes, please keep reading. If not you can always admire the nice kitten playing with his phone. Cause kittens can also have phones. First of all let’s check wikipedia for the definition of this libGDX thingy:

Creating a private git repository on a private server

Sat, 11 Mar 2017 00:00:00 +0000

Introduction

Many cats know and use github for storing their git repositories, but sometimes you have customers whose requirements don’t allow them to use any public git service. Other times you don’t want to let the world know about your messy coding style, or how do you comb your whiskers or perhaps you are only making experiments.

For all these use cases and many others, you can always create a private git repository. Of course you need to have access to a private server with the required software, note that any common GNU/Linux modern distribution will allow to do this in an easy manner.

How can we create a private repository then? These are the steps to create it.

Meowth!... I mean...

Fri, 10 Mar 2017 00:00:00 +0000

This site is the result of the work of the lazy cat of a exhausted system administrator and developer, who wanted to share its knowledge and daily rants with the world in the worst possible form, that is, a blog. Like any other place on the Internet, I tought it would be a good idea to have nice cat pictures, because everybody loves cats. This site makes use of a variety of open sources projects including: