What is Kubernetes
Kubernetes is an open-source container orchestration platform for managing, automating, and scaling containerized applications. Kubernetes is the de facto standard for container orchestration because of its greater flexibility and capacity to scale, although Docker Swarm is also an orchestration tool.
What is Kubernetes used for
Organizations use Kubernetes to automate the deployment and management of containerized applications. Rather than individually managing each container in a cluster, a DevOps team can instead tell Kubernetes how to allocate the necessary resources in advance.
Where Kubernetes and the Docker suite intersect is at container orchestration. So when people talk about Kubernetes vs. Docker, what they really mean is Kubernetes vs. Docker Swarm.
What are the challenges of container orchestration?
Although Docker Swarm and Kubernetes both approach container orchestration a little differently, they face the same challenges. A modern application can consist of dozens to hundreds of containerized microservices that need to work together smoothly. They run on multiple host machines, called nodes. Connected nodes are known as a cluster.
Hold this thought for a minute and visualize all these containers and nodes in your mind. It becomes immediately clear there must be a number of mechanisms in place to coordinate such a distributed system. These
mechanisms are often compared to a conductor directing an orchestra to perform elaborate symphonies and juicy operas for our enjoyment.
Container deployment. In the simplest terms, this means to retrieve a container image from the repository and deploy it on a node
Scaling. This is one of the most important tasks an orchestration platform performs. Containers can be replicated or deleted on the fly to meet varying end-user traffic.
Networking. The containerized services need to find and talk to each other in a secure manner, which isn’t a trivial task given the dynamic nature of containers.
Observability. An orchestration platform needs to expose data about its internal states and activities in the form of logs, events, metrics, or transaction traces.
Security. Security is a growing area of concern for managing containers. An orchestration platform has various mechanisms built in to prevent vulnerabilities such as secure container deployment pipelines, encrypted network traffic, secret stores and more. With these challenges in mind, let’s take a closer look at the differences between Kubernetes and Docker Swarm.
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