kubernetes

https://jvns.ca/blog/2017/06/04/learning-about-kubernetes/ http://kamalmarhubi.com/blog/2015/08/27/what-even-is-a-kubelet/ http://kamalmarhubi.com/blog http://kamalmarhubi.com/blog/2015/09/06/kubernetes-from-the-ground-up-the-api-server/ http://kamalmarhubi.com/blog/2015/11/17/kubernetes-from-the-ground-up-the-scheduler/

Thanks to docker. We are able to prepare small and secure container images Specify your base images, add your changes and build your container. Most images use Debian or ubuntu as base images These base images add hundreds of megabytes as the overhead Application is usually a few MB Methods: 1) Using small base images 2) Using the builder pattern Going from node 8 to node 8-alpine reduces our image size by 10 times To move to a smaller base image, update your docker file to a smaller base image. Unlike the old onbuild build image, you have to copy your code into the container and install the dependencies In the new docker file, the container users alpine base image Using the small base image gives you the flexibility to use small images But using the small containers, you might go even small by using the builder pattern. With interpreted languages - inter compiled languages, the source code is compiled code before hand Compilation step requires code, tha...

Kubernetes is a platform It can work with any type of container, not only docker At its core, its gives you a platform that can 1) Scale easily 2) Easy to do monitoring 3) Means to do deployments Master node is the kubernetes Master You decide how to do stuff You talk to Kubernetes and tell it what kind of image you want to use to create a container from and give it other critereon It creates a deployment Deployment can say a bunch of different things i need a certain amount of RAM, cpu ram filestorage All of the above things are part of the deployment K8s will keep track of it Deployment is something that keeps on going. It has a Deployment controller, that in essense If a container goes down, K8s will know about it will try to do anything to auto heal it It iwll spin an another container up and will try to auto heal it. So Deployment is not something of initial launch of a container, but something that keeps on going. Scaling: -------- If we are g...

What is kubernetes: Its an opensource orchestration system for containers, that helps the end users to Build, Deploy and Maintain distrubuted systems in a "Reliable"  and  "Scalable"  way Software to build, deploy and maintain  reliable, scalable distributed systems in ContainersHow does it do it ? It does this using Application oridnted APIs   Why do we use containers and APIs like kubernetes ? For  Velocity Scaling Agility Abstracting your infrastructure Efficiency Velocity is measured in terms of # of things you can ship to a customer while maintaining a highly available Service The core concepts that make this possible are possible - Immutability - Declarative Configuration - Online self healing systems These concepts will all interrelate and improve the speed with which you can reliably deploy software Value of Immutability: Once an artifact is created, it doesnt change via users modifications Mu...

Kubernetes: ----------- #======================================================== Kubernetes is a open source orchestration system to manage docker containers It manages the scheduling of the containers on to the compute cluster and actively manages the workloads so that the STATE manages the users declared intentions USING the Concepts of LABELS and PODS , it groups up the containers that make up an Application into logical units for easy management and Discovery Kubernetes uses LABELS as nametags to identify things IT can query based on these labels LABELS are open ended We can use labels to specify roles,Stability or other important attributes PODS: Pods are where the containers live in the kubernetes Cluster In Kubernetes a POD represents a runnable unit of WORK Usually you will run a single container inside a POD BUT for cases like, where few containers are tightly coupled, you may opt to run more than one container inside of the same pod Kubernets t...

We all have heard about kubernetes But what is it , what does it provide ? Basic information  is At its core, kubernetes provides a means to do  Deployment                                                                             Scaling                                                                             Replication                                               It also gives   you  Monitoring   of our application/s Kubernetes gives these things, to manage the...