What command starts a new container from an image?

What command starts a new container from an image?

• A. `docker start`
• B. `docker run`
• C. `docker launch`
• D. `docker create`

Answer: (B)

The command that starts a new container from an image is `docker run`. This command not only creates a container from the specified image but also immediately starts it. It is a fundamental command in Docker, commonly used to create and launch containers in one seamless step. When using `docker run`, you can specify various options such as environment variables, port bindings, and volume mounts, making it versatile for spinning up containers tailored to specific needs. The other commands, while related to Docker management, serve different purposes. For instance, `docker start` is used to start an already created or stopped container, while `docker create` simply sets up a new container but does not start it. The command `docker launch` is not a valid Docker command, which further reinforces that `docker run` is the correct choice for both creating and starting a new container.

The command that starts a new container from an image is docker run. This command not only creates a container from the specified image but also immediately starts it. It is a fundamental command in Docker, commonly used to create and launch containers in one seamless step. When using docker run, you can specify various options such as environment variables, port bindings, and volume mounts, making it versatile for spinning up containers tailored to specific needs.

The other commands, while related to Docker management, serve different purposes. For instance, docker start is used to start an already created or stopped container, while docker create simply sets up a new container but does not start it. The command docker launch is not a valid Docker command, which further reinforces that docker run is the correct choice for both creating and starting a new container.