Apache Nifi, an awesome open-source tool from the Apache Software Foundation for implementation of data routing, transformation, and system mediation logic. For the purpose of smooth handling of data, this tool provides a set of processor, each designed for a dedicated task. In this post, we will see how one can send email to others using some processors provided by Apache Nifi. Follow for more detailed steps….
Author: Chinmaya Dehury
Securing Nifi with firewalld
In our previous post, we have learned how to secure Apache Nifi with Google’s OAuth2. In that post we saw, how user can be authenticated via Google’s OAuth client ID.
In this post, we will see how the outside user can be blocked permanently from accessing Apache Nifi’s UI. Here outside user means, the user who is accessing UI from different machine. Follow for more detailed steps….
Ansible-Playbook Example3: Generate multiple files at specific time interval
In the previous post, we have seen how to generate multiple files using with_sequence and loop features.
Here, we will introduce the delay functionality in the loop feature. This will give a pause after every iteration. So, each file will be created at specific time interval. The official document on loop control can be found here. Download the .yml file directly if you don’t want to go through the discussion.
Ansible-Playbook Example2: Loop, with_sequence
Loop and with_sequence allows the commands or the instructions to be executed iteratively. However, I find the syntax bit different from other programming language. Probably this is due to YAML structure. Anyways, lets see few examples and see how to use loop and with_sequence. You can find the official documentation on loop here and on with_sequence here. The list of examples are as follows:
Ansible-Playbook Example1: Ping remote machine
Two ways to test the connection with remote servers.
- One is to write the playbook and execute
- Other is directly passing the ping command as an argument to ansible command
Ansible: Installation and Configuration
Ansible is an open-source software provisioning, configuration management, and application deployment tool. It runs on many Unix-like systems, and can configure both Unix-like systems as well as Microsoft Windows. Before proceeding for the installation, it is necessary to get yourself comfortable with basic knowledge.
Ansible Wikipedia: https://en.wikipedia.org/wiki/Ansible_(software)
Official Documentation: https://docs.ansible.com/
Click here to proceed for quick guied on Installation and configuration
JSAC Submission Error: “Upload failed: One or more fonts are not embedded.”
This is a common problem in research community. While submitting a manuscript to any journal (e.g. using EDAS system) you may encounter a common problem “Upload failed: One or more fonts are not embedded”. The solution is to embed all the font into the pdf and then upload the manuscript (in PDF format). Continue reading….
Installation of Cloudify CLI on Ubuntu 14.04 for service deployment using TOSCA standard
Before moving towards installation of Cloudify, it is recommended to obtain the basic concept of Cloudify and TOSCA standard. In this post we will see how to install Cloudify CLI, through which we can deploy, scale and monitor the different cloud service. For better understanding lets install this in local machine. The basic steps can be refereed and extended for actual cloud environment.
The steps are as follows: <read more…>
Working with Cloudify and ARIA TOSCA – Beginner
TOSCA is a standard that enhance the portability and operational management of cloud and other types of applications and services across the entire life-cycle. On the other hand, Cloudify is an open source cloud orchestration framework and it Domain Specific Language is based on TOSCA standard. Click here to read in more detail.
Q-learn: solving Knight and Princess problem from scratch with Q-learn algorithm
This is another post on Q-learning reinforcement algorithm. Here we will understand and implement the Knight & Princess problem from the scratch using Python language, where the Knight need to move to the place of Princess ignoring the enemies on its way. In this post I have not used any third party library such as gym. Read more…