Kubernetes takes the idea of containers and instead of running containerized applications on one server, distributes them across a cluster.ĭue to the popularity of containers, there was a need for an open image standard. In order to understand why Kubernetes and Docker became famous together, let's understand how Docker is integrated within Kubernetes and what Open Container Initiative (OCI) and Container Runtime Interface (CRI) mean. Kubernetes? What does it have to do with all this?
That was why Docker became so popularly known as a "container".
It was created in such a way that everyone can install it, build container images, pull them from registries, and create, start, and manage containers. Docker Architectureĭocker, defined as a "container", is nothing more than a user-friendly tool for interacting with containers. As the mission evolved, LXC was changed to containerd.Ī current Docker set-up is split into: containerd, for managing containers, and dockerd, a persistent process daemon that provides information from the Docker host machine. It is important to segregate methods because of running processes independently.ĭocker used Linux Containers (LXC) because of the runtime backend. Official Docker Documentation in Docker overviewĭocker makes use of the Linux kernel and functions of the kernel.
Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. Mystery inside Dockerĭocker is an open platform for developing, shipping, and running applications.
To date, for many there's just the only one word called "DOCKER" to refer to all this. It seems there's no difference between the company, the containers, the images and the tools that are used by developers. In today's world, it's still difficult to understand what Docker is. Then, why all this fuss? Should we continue writing Dockerfiles? In late 2020, the Kubernetes team deprecated Docker and announced that support will be completely removed at the end of 2021. This deprecation has brought multiple changes, creating a little confusion because of using Docker as the CRI instead of Docker as the OCI.