As Kubernetes is a container orchestrator, it needs a container runtime in order to orchestrate. Kubernetes is most commonly used with Docker, but it can also be used with any container runtime. RunC, cri-o, containerd are other container runtimes that you can deploy with Kubernetes.
What is difference between Docker and container?
Docker images are read-only templates used to build containers. Containers are deployed instances created from those templates. Images and containers are closely related, and are essential in powering the Docker software platform.
Can a container have multiple images?
You cannot have “multiple images to run in one container”, that wouldn’t make sense. Then you would have to get all of them started automatically when the container starts. You can use a process manager such as supervisord (Docker documentation here).
What is Docker and how it works with containers?
Docker provides the ability to package and run an application in a loosely isolated environment called a container. The isolation and security allow you to run many containers simultaneously on a given host.
Is Docker container a process?
When a Docker container is launched, it runs a single process. This process is usually the one that runs your application when you create containers per application. This very different from the traditional OS containers where you have multiple services running on the same OS.
What exactly is a container?
Containers are a form of operating system virtualization. A single container might be used to run anything from a small microservice or software process to a larger application. Inside a container are all the necessary executables, binary code, libraries, and configuration files.
What does Docker CLI command do?
The docker run command first creates a writeable container layer over the specified image, and then starts it using the specified command. See docker ps -a to view a list of all containers. The docker run command can be used in combination with docker commit to change the command that a container runs.
What is a docker entrypoint?
Docker Entrypoint ENTRYPOINT is the other instruction used to configure how the container will run. Just like with CMD, you need to specify a command and parameters.