Two questions were very important to me when my interest was on Kubernetes :

• What is Kubernetes ?
• What Kubernetes is not ?

By answering to these two questions, i was sure to start from the right point and also know the responsibility of Kubernetes .

So let's make a pragmatic responses about that .

💡What is Kubernetes ?

Kubernetes is a platform that wrap a huge number of services and capabilities ; these latter is growing day after day .
From a top level we can say , the core functionalities of Kubernetes is it's ability to manage containers across linux based infrastructure .
But Kubernetes brings also a lot of feature such as :

• Managing Secrets
• Checking applications Health
• Scaling application : Scale app and down
• Auto Scaling
• Instance replication
• Discovering resource
• Naming Resource
• Monitoring resource
• Managing and mounting Storage system
• Providing security component : Authorization , Authentication

In one sentence the responsibility of K8S is

Platform for managing containerized workloads and services, that facilitates both declarative configuration and automation.

⛔️ What Kubenetes is not ?

The Common mistake is to say Kubernetes is a Paas !

Kubernetes is not a platform as a service (Paas) , in my opinion Rancher is a Paas for Kubernetes , It provide a high level configuration for kubernetes and provide some default configuration for Kubernetes to .

In fact Kubernetes doesn't dictate many aspects of our system and leaves them up to us to manage them .

In facts Kubernetes does :

• not require a specific application type or a dependency framework
• not require a specific programming language
• not provide any database
• not provide any message queues
• allow us to choose our logging system
• allow us to choose our monitoring & alerting system
• ..etc

That's all Folks

In the next post we will discuss the relation between K8S and containers . We will find response for questions such as :

• What's benefits of containers
• How we need to manage our containers
• ...etc