#amalgjose

Route internet traffic through a specific interface in Linux Servers – CentOS / RHEL

I have a server with multiple network interfaces. Out of that two of them were connected to two different networks. My requirement is to route the internet traffic through the second interface. The Server is running with CentOS 7 operating system. The second interface is connected to a network with higher internet bandwidth and the first interface is connected to a network with lower bandwidth.…

Gunicorn Connection in Use: (‘0.0.0.0’, 8000)

I develop web services using python flask. One of the common error that I see while deploying the application is “Gunicorn Connection in Use: (‘0.0.0.0’, 8000)”.

This means that the port 8000 is busy with some other running process. But when I check the status of the port with the following command, I get empty response. That means there are no active application using the port. Some stale…

SELinux modes – Simple explanation

Everyone who uses linux might be familiar with SELinux. The full form of SELinux is Security-Enhanced Linux. It is a kernel level security module that enhances the access level security policies.

In this post I will be quickly explaining about the various modes in SELinux.

There are three modes in SELinux

Enforcing

Permissive

Disabled

In CentOS and RHEL systems , the SELinux configurations are…

What is Green House Farming ?

Green House Farming is a technique in which the crops are cultivated in a controlled enclosed environment. This is basically to control the effects due to whether changes.

Advantages of Green House

Plants will get an environment with consistent temperature and Humidity

Plants will be protected from birds and other organisms

The moisture content in the soil will not…

Delta Science – The art of designing new generation Data Lake

When we hear about Delta Lake, the first question that comes to our mind is “What is Delta Lake and How it works ?”. 

“Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads”

But the question is how it is possible to maintain transactions in the Big Data world ?. The answer is very simple. It is using Delta Format.

Delta Lake stores data in…

Run a background function in Python

An example of executing a function in the background. The main execution will continue in the same flow without waiting for the background function to complete and the function set for background execution will continue its execution in the background. https://gist.github.com/amalgjose/bdcd3d4d69f3b51721c1c9df412cf25f

Disable auto restart policy of docker container

If a docker container is started with –restart always, then the container will not allow you to stop it.  We can change this behavior by modifying the restart policy. Refer the docker  official documentation for more info

For example

docker run -d --restart=always -p 80:80 -it nginx

To modify this behavior, try the following command.

docker update --restart=no your-container

Another option that…

How to check the entries in fstab without system reboot

/etc/fstab contains information about the disks. It has the details about where the partitions and storage devices should be mounted. We usually configure automount, disk quota, mount points etc in this fstab.

Inorder to test the entries or modifications in fstab without restart the following commands will be helpful

mount -a

The above command will mount all the filesystems mentioned in the…