Microservices are decoupled components that follows the Single Responsibility Principle (SRP), that is, a component does one thing but does it really well. In this mini-book we will be discussing various patterns for decomposing a service into a microservice. What motivates developers to go Micro? How to decompose your services? Handling Cross-cutting concerns Handling communication between micro-services ? Service-Discovery - Where is my-service? Handling failure across dependent services (Circuit breaking reliability) Handling storage-dependencies for microservices Handling access to services Service Function Validation Logging, Instrumentation, and health-checking (Observability) Is it really worth it?
In this post we will walk through the definitions, Properties and patterns for building Microservices. What are Microservices? A microservice is really just a service that adheres to a slightly looser definition of the Single Responsibility Principle (SRP) that arose from patterns for object-oriented design. It is a service that does one thing. Properties of Microservices Small, and Focused on Doing One Thing Well AutonomusTo do decoupling well, you’ll need to model your services right and get the APIs right.
Have you ever tried to spend sometime alone somewhere, thinking about nothing, just letting your absolute self talk to you. I have, and it feels great. Usually, we are occupied mentally by tasks that we are mandated to finish, meetings that we have to attend, people that we have to discuss with, thus leaving no time for ourselves, for discussing important life matters, for defining who we truly are in this life.
As a young kid, I strived for being good at school, for being the best at the swimming club, for getting high honors, and most importantly for being recognized and acknowledged by my peers at school and my family at home. My purpose was to please others and not myself, and as I grew up and started to get a grip at how the world works, I started to feel empty inside, I started to feel that I have not done anything for myself but I have done it all for others.
Okay, so I am going to try and make this brief and to the point for you to get going. You need a Kubernetes cluster working with Kubeadm? good you are in the right place. First, lets get over the problems first. What you need to see at the end is the following: kube-system dummy-2088944543-1x359 1/1 Running 1 1d kube-system etcd-master 1/1 Running 1 1d kube-system kube-apiserver-master 1/1 Running 0 1d kube-system kube-controller-manager-master 1/1 Running 1 1d kube-system kube-discovery-1769846148-1khb9 1/1 Running 1 1d kube-system kube-dns-2924299975-pg660 4/4 Running 4 1d kube-system kube-flannel-ds-25l4t 2/2 Running 2 1d kube-system kube-flannel-ds-9jtd5 2/2 Running 2 1d kube-system kube-flannel-ds-lvskl 2/2 Running 8 1d kube-system kube-proxy-l1hn5 1/1 Running 1 1d kube-system kube-proxy-p1kbt 1/1 Running 1 1d kube-system kube-proxy-x2b1m 1/1 Running 1 1d kube-system kube-scheduler-master 1/1 Running 1 1d Not this …
In today’s virtual network architecture, NFV is paving the way to become to defacto standard for providing network services in the cloud. NFV relies on Service Function Chaining (SFC), to stitch services together to provide a service-path for packets to traverse. OpenStack, one of the more successful open cloud platforms is considered a good base to start building services for NFV related functions. In this post, we will be having a sneak-peak over the components exposed by neutron-sfc, the service chaining API exposed by OpenStack.
We tend to have a very narrow perspective when it comes to defining happiness. Some people think that happiness is where “happy” people are. Truth is, it has noting to do with the location, I am not sure how to describe it, there are many factors that when combined can make you happy, I am not sure I ever experienced fully fledged happiness, but I experience inner-peace every once in a while and I believe that inner peace is one of the magic ingredients of happiness.
In this post, we are going take a quick look at how OpenStack does networking, along the process we are going to mention the important agents involved.
So having problems using SSH to log into your servers? don’t fret, I am writing this to make your life easier.
There are two ways to use SSH, one using “PasswordAuthentication” and one using ssh-generated public and private Keys. The keyed methods is the one you will end up using most of the time. Now. here is how to go about it:
Welcome to the Software-Define Stack Series, this will be an extensive series, exploring the software-defined aspects behind OpenStack and digging deeper into the structure of OpenStack and its internal anatomy. Before I start to talk about OpenStack specifically, let me explain why this series is called the “Software-Defined” series. The term Software-Defined was first used to describe networks which follow these following patterns: Has decoupled control and data-planes (i.e., the brain is not in the body) Abstracts the underlying functions of the network components (i.