Author: Nayar

Published on by Nayar

Le Gall Butter with “Fleur de Sel”

With butter prices soaring in Mauritius, I found this butter at around Rs 100 on promotion. Decided to give it a try. It is made using traditional methods.

 

It was awesome. It is not made with normal salt but rather with fleur de sel. Fleur de sel “is a salt that forms as a thin, delicate crust on the surface of seawater as it evaporates”. It tastes really good. I ate the butter in less than 4 days. Some say eating too much butter is bad for health. But I just love butter <3

 

 

 

Published on by Nayar

How much does Rs +2.40 per litre petrol actually cost? #Mauritius

Today, Gasoline is going to be sold at Rs 47.30 per litre incurring an increase of Rs 2.40 per litre. But how much will it cost me per month?

I drive on average 1100km per month commuting to work daily from Ebene to Curepipe and on weekends, family trips to the sea and malls. This makes around 78 litres of Gasoline per month.

When Gasonline was at Rs 44.90/litre, it would cost me Rs 3502/month (Rs 44.90 x 78). With the latest price increase, it becomes Rs 3689/month (Rs 47.30 x 78).

I’d be spending Rs 187 / month more at the fuel station as from now. We got Rs 360 as salarial compensation recently.

Will you buying an electric car “Made in Mauritius”? Please contact me if yes.

Published on by Nayar

Enabling UDP load-balancing with Nginx on Debian 9 (Stretch)

User Datagram Protocol (UDP) is commonly used for DNS resolution and video/voice streaming applications. The advantage of UDP over TCP is that it has less overhead (smaller packet size). You can therefore send more data on your network with less latency. However this comes at the expense of data reliability.

Lemme guide you to how setup an Nginx server (10.0.0.5) which forwards UDP packets from port 514 to a Graylog server (10.0.0.10) on port 514 itself. We will be sending logs from a VM on 10.0.0.2

On your nginx server:

# echo “deb http://nginx.org/packages/debian/ stretch nginx” > /etc/apt/sources.list.d/nginx.list
# apt-get update
# apt-get install nginx

You should now have nginx installed. Paste the following snippet in your `/etc/nginx/nginx.conf`

stream {
  upstream graylog_upstreams {
    server 10.0.0.10:514;
  }

  server {
    listen 514 udp;
    proxy_pass graylog_upstreams;
    proxy_responses 0;
    proxy_bind $remote_addr transparent;
  }
}

Check if Nginx is listening on UDP port 514

root@prod-r7-nginx:~# ss -ntplu

However if you sending data to this port from another machine, you’ll notice that no data is sent to the backend server. Despite `tcpdump` will see the data coming and being sent.

IP 10.0.0.2.38696 > 10.0.0.5.514: SYSLOG kernel.info, length: 120
IP 10.0.0.2.45605 > 10.0.0.10.514: SYSLOG kernel.info, length: 120

We need to tell the kernel to actually route IP addresses which doesn’t belong to him thus acting like a router. We do so by the following command

sed -i "s/#net.ipv4.ip_forward.*/net.ipv4.ip_forward=1/" /etc/sysctl.conf
echo 1 > /proc/sys/net/ipv4/ip_forward

And that’s it 🙂

Do you like nginx’s UDP loadbalancing feature?