Node.Js to Kubernetes journy

Hello all,

Yea yea long time no see 🙂 I know, I haven’t share a new improvement story for long time . Improvement is a kind of life style for me but I couldn’t have time share all of it.

In the mean time I had a lots of changes in my life but the most important is , I have owned my own company , Bigs Bilisim Ltd.Sti. “https://www.bigsbilisim.com”

This days , I have some spare time to write a blog , here is the my latest post

Node.Js Application on Docker.

I am managing a multinational companies infrastructure as a Linux / Windows admin and Devops Engineer . My customers ERP systems has no access to internet in any way. ERP systems internet access is not allowing even by a proxy because of the company policy.

Every morning one of trainee updating the all exchange rates in the ERP system manually. Time to time wrong entries or similar mistakes can cause couple of problems.

One day one IT Application teams member called me and can we write a small app for this manual operation. Because ERP system has got the ability of import xml files to ERP system . T.C. Mekez Bankası also publishing the rates as xml format. My answer was challenge accepted 🙂

Well I am not a programmer but I though, I can handle it some how.

I have googled couple of similar solutions and scenarios about the requested solution. I have found the node.js world.

I have wrote the code in one day , If you consider , I don’t have programmer background , it is good timing , I guess.

Here is the code of

index.js and package.json

Now when I have run the program in node js it is getting the exchange rates as in xml format by calling url;

Like ;

curl xxx.xxx.xxx.xxx:3000/exchangerates

When they have try to call this url via ERP systems it was successfully entering the Exhange Ratest in it.

Now the challenge is how this small program run in smooth environment without any effects.

This wasn’t a hard task to do it but this time I would like to made a fantasy;

Lets dockerize it.

I have share this program and my dockerize fantasy with the customer, They love it and they were really looking forward the taste it of container technology .

First I have install docker desktop to my machine ,

It was another challenge for me , but after watching couple of video , I have prepared the Docker file for this program.

Now I need to create the docker container on my desktop.

I have used this command:

docker build . -t ckocaman/exchange_rates:”Latest”

After creating the container I have push it to my docker hub account.

After pushed to hub , I can install on any containerized technology system.

At the beginning it was working on a single docker server , in these days it is a part of a kubernetes cluster as a pod and service.

This small application development story has been opened the application virtualization technology window to me. Well I am still learning it ( I hope every IT Guys keep learning every day !) , but I assume I can do better things with that .

Air Condition For My Old Model Car

I have been told you at my first warm hello post , I will also publish my ideas and engineering stuffs. This story and the idea came to my mind with low income times. It was difficult times for me and for my family, now on that’s all history for us but, hard times needs specific solution with low costs.

My idea has been started with a old rusty car. I had to buy a an old car because it was the only one, I can afford. I bought a Ford Escort 1990 Model MK3 Chases. It was my childhood dream car at high school times.

Yes it was old but it has been a real good condition for me 🙂

I bought it in February 2017, my kids are not very happy about it but (because of the view and old design.) that’s what I can do for now.

At winter everything’s were fine, my car heater was working very good. We were enjoying the car advantages . Going to weekend vacations to near snowy places, family picnics etc… They have started to loving it.

Day by day summer was about the come and we have to keep it open our car windows, because it is getting hot, Hard times were coming up.

I need to find a way the keep cool inside of the car, but how ?

My car was using the liquid petroleum gas as fuel. Because LPG is much cheaper than gasoline in Turkey. Yes it comes with some of disadvantages to car but we have to deal with it. One liter gasoline price equal to almost tree liter of LPG. In Turkey almost every gasoline fuel cars ( don’t have to be an old) uses this systems. As an example you can check this site .

Small Engineering Information;

LPG is storing with liquid form in a big tank at back site (trunk) of the car. But when you want to burn it in the engine you need to convert it to the gas form . For this purpose every LPG Systems has LPG regulators for it. Regulators have tree rooms inside. Two room for engine hot water , one room for LPG for change. If you have small physic knowledge, When the gasses are storing in liquid form , while the vaporizing operation it absorbs heat energy around it, That means LPG regulators without engine cooling water heat , can freeze to minus forty degrees (- 40 C ) because of the GAS vaporizing heat absorb.

If I can transfer that cold to inside of the car, it will solve all of my problems. But how ?

It was simple , I need to switch inside heat exchanger water pipes to LPG Regulator, after it I need to make a water circulation between them with a small water pump.

My Tests ;

Heat exchanger will fill with cold water , It will absorb heat from car inside . It will get cold inside of the car. The idea was simple. Now I need to try.

It was really hard to seal the water inside of the cooling system. Finding suitable parts, isolating the cold water from engine heat was my challenges.

after with many tries, tests. As I can say it seems working.

Test Results ;

At my test outside of the temperature was almost 34 C’ after LPG AC inside of the car was 25 C’. I don’t have a video or photos to prove it but all I can say, we went to a summer vacation with this car to Dalyan Turkey 🙂

Also I have publish it a Facebook group which is Türk Mucitler Klübü

Also you can increase the system cooling performances with Peltier water cooling module.

I believe it will use full for someone 🙂 Because for me. It was !

Category: Engineering Solutions