How does Docker Work?At the core, you run Docker like a system service or daemon on your host computer. A Docker host runs a copy of Docker that’s in the background.
How do you start a container?. Docker works in three basic steps:
Pull a Docker image from Docker Hub.
Start a new container from that image.
Manage any connected volumes.
Manage any configuration files stored in your Docker instance.
This three step process is used to manage most container workloads. A Docker image is a record of software that’s “baked” and customized by the Docker engine. Docker images are used as a way to ship working software that’s ready to run.
Using Docker is a best practice that produces a repeatable and disposable container workload. It ensures that any software that’s deployed in the container is tested, worked on, and ready for production. It also reduces the number of steps it takes to start a Docker container.
Modify images that have complex build environment requirements. Use Docker to bootstrap a new Docker environment.
Modify images that can’t be built in-place. Use Docker to streamline the build process.
Run legacy workloads on a newer infrastructure. Run workloads that require a specific version of Docker on a newer version of Docker.
Start containers on your local computer or in the cloud.
Manage Docker’s DNS resolver settings.
How do I pull an image?
Docker images are published to Docker Hub, from which they can be pulled. When you pull an image, Docker downloads a copy of the image and stores it in the local Docker repository.
To pull an image, run a Docker command. You can run a command in the Docker host itself, or you can run a command in a container.
Before you run a command, check that you’ve installed Docker and that Docker is running.
To install Docker, download the latest version of the Docker client from www.docker.com.
Run the docker container
Once you’ve installed Docker, run a command that starts Docker and starts the image. Use “docker run” to run a single image.
You can run a container from the Docker host or you can run a container using a volume.
When you run a container from the Docker host, you create a container that runs on a host computer, which is connected to
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