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Clustering of Docker Containers using Docker Swarm

There are many available ways of Docker clustering. Kubernetes, Docker cloud, Docker Swarm etc., In this Tutorial we will learn setting up a cluster using Docker Swarm and launch a container on Node.


How to access EC2 instance even if pem file is lost

Accessing the EC2 instance even if you loose the pem file is rather easy.

1. First, create a new instance by creating new access file, call it 'helper' instance with same region and VPC as of the lost pem file instance.

2. Now stop the lost pem file instance. Remember not to terminate instance but to stop it.


Celery Flower to monitor task queue

Celery is a task queue that is to built an asynchronous message passing system. It can be used as a bucket where programming tasks can be dumped. The program that passed the task can continue to execute and function responsively.

To monitor the status of these celery tasks we use celery flower

The Celery Flower is a tool for monitoring your celery tasks and workers. It's web based and allows you to see task progress, details, worker status.


HTTP2 and SPDY Protocols - Make HTTP Faster and Safer

HTTP/2, next version of HTTP/1, http/1 can not handle the present web which has become more resource intensive, it cannot processes multiple requests in an efficient manner. HTTP/2 has got many techniques to harness the requirements of current web experience.

SPDY is the core part of HTTP/2 protocol, many of the http/2 protocol techniques are part SPDY.


Integrating Gitlab in django project with gitlab api for gitlab authentication and access

This is a simple way to integrate gitlab authentication in your django apps.

We can get user verified email id, general information, git lab URL and token from Gitlab API.

These Following steps are needed for Gitlab integration:

1. creating git lab app
2. Authenticating user and getting an access token.
3. Get user information, git lab URL using an access token.


Working with python collections part 2

Python collections - Counter is to count the frequency of character, OrderedDict is to track the order of the contents in which they are added and defaultdict is to provide a default value for a nonexistent key for the dictionary element are explained with real time examples in part 2 of collections series.


Django Conditional Expressions in Queries

Reduce database queries in django with Conditional Expressions. By using Conditional Expressions we can use "If...Elif...Else" expressions while querying the database so that we can reduce the number of queries to the database and increase the response time. If we don't use conditional expressions in queries we have to write raw SQL queries or we have to hit/query the database for multiple times. That's the reason Django included Conditional Expressions from version 1.8


Sorl-thumbnail to generate thumbnails in django

Displaying and Customizing the images in django with sorl-thumbnail.


Check test coverage in code with Coveralls

Coverage: It is a tool used for measuring the effectiveness of tests, showing the percentage of your codebase covered by tests.
Test Coverage is an important indicator of software quality and an essential part of software maintenance. It helps in evaluating the effectiveness of testing by providing data on different coverage items. It is a useful tool for finding untested parts of a code base. Test coverage is also called code coverage in certain cases.


Python to Debian package: Simple, Easy and Fast

Packaging python script to debian follows strict instructions, using the following instructions, most of the steps can be skipped hence making it easy and fast.
If you like video goto https://www.youtube.com/watch?v=a9GzDZB5VeU. This video doesn't show setup.py file creating which is required, but excluding that portion everything is same as below.


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