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The image used to start a container. This string is passed directly to the Docker daemon. Images in the Docker Hub registry are available by default. Other repositories are specified with repository-url/image:tag . Up to 255 letters (uppercase and lowercase), numbers, hyphens, underscores, colons, periods, forward slashes, and number signs are allowed. This parameter maps to Image in the Create a container ( section of the Docker Remote API ( and the IMAGE parameter of docker run (

Images in official repositories on Docker Hub use a single name (for example,

ubuntu or mongo).

Images in other repositories on Docker Hub are qualified with an organization

name (for example, amazon/amazon-ecs-agent).

Images in other online repositories are qualified further by a domain

name (for example,