July 2017
Beginner to intermediate
358 pages
10h 54m
English
Content preview from Building Microservices with Go
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CMD
The CMD instruction has three forms:
- CMD ["executable", "param1", "param2"] // exec form
- CMD ["param1", "param2"] // append default parameters to ENTRYPOINT
- CMD command param1 param2 // shell form
When CMD is used to provide default arguments for the ENTRYPOINT instruction then both the CMD and ENTRYPOINT instructions should be specified using the JSON array format.
If we specify a default value for CMD, we can still override it by passing the command arguments to the docker run command.
Only one CMD instruction is permitted in a Docker file.
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