Category Archives: C#

Fault tolerance using Polly

What is a Resilience Framework?

Polly is classed as a resilience framework. A resilience framework is a set of libraries that help an application to recover from transient or more extended failures in services or infrastructure upon which it depends. When recovery is not possible, the resilience framework will facilitate graceful degradation of your application.

Polly has been around for many years and has been tried and tested in many applications

http://www.thepollyproject.org/

The source code for Polly can be found on GitHub here:

https://github.com/App-vNext/Polly

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JSON Web Tokens (JWT)

Overview

JSON Web Tokens is an emerging standard. They are very close to their standardisation. IETF has taken care of that, and OpenID connect mandates the use of JSON Web token for all of the tokens that are exchanged in that protocol. this article gives you a little look, an overview of the purpose of security tokens, and, and what other types of tokens we have out there and where, where they are used. Then we have a look at the structure of a JSON Web Token, and then we’ll show you how easy it is to create and consume them using the Microsoft DotNet Core development framework.

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Docker cribsheet

Build

Build an image from the Dockerfile in the current directory and tag the image

docker build -t myimage -f Dockerfile .

List all images that are locally stored with the Docker Engine

docker ps -a

Delete an image from the local image store

docker image rm CONTAINER_NAME

You may want to remove all orphaned images, you can do this with dandling field

docker rmi $(docker images -f dangling=true -q)
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NET Microservices Architecture for Containerised NET Applications

I came across this guide as it is an introduction to developing microservices-based applications and managing them using containers. It discusses architectural design and implementation approaches using .NET Core and Docker containers. To make it easier to get started with containers and microservices, the guide focuses on a reference containerized and microservice-based application that you can explore. The sample application is available at the eShopOnContainers GitHub repo.

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