We all know how important Containers have become in today’s fast-moving IT world. Pretty much every big organization has moved out of their traditional approach of using virtual machines and started using Containers for deployment. They are looking for trained Kubernetes professionals who have in-depth knowledge about containerization and orchestration tools. So, it’s high time you understand what is Kubernetes?
What Is Kubernetes?
Kubernetes is an open-source container management (orchestration) tool. It is container management task, contain container deployment, scaling & descaling of containers and container load balancing.
Note: Kubernetes is not a containerization platform. It is a multi-container management solution. Going by the definition, you might feel Kubernetes is very ordinary and unimportant. But trust me, this world needs Kubernetes for managing containers, as much as it needs Docker for creating them Features Of Kubernetes This is the right time to talk about Kubernetes’ features as you already understand what it does and how it compares against Docker Swarm.
- Automatic Bin packing
Kubernetes automatically packages your application and schedules the containers based on their requirements and available resources while not sacrificing availability. To ensure complete utilization and save unused resources, Kubernetes balances between critical and best-effort workloads.
- Service Discovery & Load balancing
Selecting Kubernetes, there is no need to worry about communication and networking because Kubernetes will automatically allocate IP addresses to containers and a single DNS name for a set of containers, that can load-balance traffic inside the cluster.
- Storage Orchestration
With Kubernetes, you are able to mount the storage system of your optimal. You can either opt for local storage, or choose a public cloud provider such as GCP or AWS, or perhaps use a shared network storage system such as NFS, iSCSI, etc.
Personally, this is my favorite feature. Kubernetes can automatically restart containers that fail during execution and kills those containers that don’t respond to user-defined health checks. But if nodes itself die, then it replaces and reschedules those failed containers on other available nodes.
- Secret & Configuration Management
Kubernetes is able to help you deploy and upgrade secrets and application configuration without reconstructing your image and without exposing secrets in your stack configuration.
- Batch Execution
In addition to managing services, Kubernetes can also manage your batch and CI workloads, thus replacing containers that fail, if desired.
- Horizontal Scaling
Kubernetes requires a single command to scale up the containers or to scale them down when exhausting the CLI. Else, scaling may also be completed via the Dashboard (Kubernete UI).
- Automatic Rollbacks & Rollouts
Kubernetes progressively rolls out changes and updates to your application or its configuration, by ensuring that not all instances are worked at the same instance. Even if something goes wrong, Kubernetes will roll back the change for you. These were some of the notable features of Kubernetes.
So, now on moving onto the next part of this ‘what is Kubernetes’ blog, let me explain the working architecture of Kubernetes.
Since Kubernetes implements a cluster computing background, everything works from inside a Kubernetes Cluster. This cluster is hosted by one node acting as the ‘master’ of the cluster, and other nodes as ‘nodes’ which do the actual ‘containerization‘. Above is a diagram showing the same. kubernetes architecture – what is kubernetes Kubernetes Architecture – What Is Kubernetes Master controls the cluster and the nodes in it. It ensures the execution only happens in nodes and coordinates the act. Nodes host the containers; in-fact these Containers are grouped logically to form Pods.
Every node is able to run multiple such Pods, which are a set of containers, that interact with each other, for a deployment. Course Curriculum Kubernetes Certification Training Weekday / Weekend Batches Replication Controller is Master’s resource to ensure that the requested no. of pods is always running on nodes. Service is a body on Master that offers load balancing over a replicated group of Pods.
So, that’s the Kubernetes architecture in a simple manner. You can expect more details on the architecture in our next blog.