Docker Dockerfiles FROM Instruction
Example
FROM <image>
Or
FROM <image>:<tag>
Or
FROM <image>@<digest>
The FROM instruction sets the Base Image for subsequent instructions. As such, a valid Dockerfile must have FROM as its first instruction. The image can be any valid image – it is especially easy to start by pulling an image from the Public Repositories.
FROM must be the first non-comment instruction in the Dockerfile.
FROM can appear multiple times within a single Dockerfile in order to create multiple images. Simply make a note of the last image ID output by the commit before each new FROM command.
The tag or digest values are optional. If you omit either of them, the builder assumes a latest by default. The builder returns an error if it cannot match the tag value.
