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What are the most commonly used instructions in Dockerfile?
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What are the most commonly used instructions in...
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Jun 20, 2021
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JackTerrance
What are the most commonly used instructions in Dockerfile?
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Jun 20, 2021
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JackTerrance
FROM:
This is used to set the base image for upcoming instructions. A docker file is considered to be valid if it starts with the FROM instruction.
LABEL:
This is used for the image organization based on projects, modules, or licensing. It also helps in automation as we specify a key-value pair while defining a label that can be later accessed and handled programmatically.
RUN:
This command is used to execute instructions following it on the top of the current image in a new layer. Note that with each RUN command execution, we add layers on top of the image and then use that in subsequent steps.
CMD:
This command is used to provide default values of an executing container. In cases of multiple CMD commands the last instruction would be considered.
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