How can we manage this setup? By managing, let’s say we want to update our shopping cart module or scale up one of the containers to have 2 replicas. Now we have a total of 3x5 = 15 containers running, distributed evenly on 3 nodes. To eliminate the chance of node failure, like network outage, we multiply the nodes by - say 3. Imagine having our e-commerce app having 5 micro-services each of which are deployed in containers inside a single node (hosted server). So, little or no coding skill is required!

It follows the configuration based approach and automation.

Manages container workloads and services (orchestrates the containers).

“Kubernetes is a portable, extensible open-source platform for managing containerized workloads and services, that facilitates both declarative configuration and automation.” Kubernetes does this orchestration part for us! Now if you read the Kubernetes definition above. Many a time we find our code works perfectly fine in development but breaks as soon as it is deployed! Also, for large applications, we might not have a single production VM, instead of different VMs set up for a different set of environments, like dev, stage, prod, etc. We try and test out multiple things in our local system where the configuration is very different from that of our hosted VMs. Application development, simple or complex comes with a rat’s nest of dependencies, libraries, and packages. You see, it’s all easier said than done if you consider your local environment is at par with the environment inside the VMs or the host machine. This requires careful app design as resources and dependencies are shared between all the apps.Īfter this is done, we expose our APIs to the outer world so that everyone can interact with our application.

We design our app to run in a specific host and deploy them on the host machine as it is. The other is the most simple way of doing things.

This is required if we want some kind of isolation between the applications. Have a hypervisor that can facilitate running multiple VMs ( Virtual Machines).For each one, we have a host machine running a particular operating system.

What is kubernetes for dummies