if you wish to run a different command than echo in this container), then you need to specify the -entrypoint parameter on the command line: $ docker run -entrypoint=/bin/hostname test If you want to override the entrypoint listed in your Dockerfile (i.e. You can provide different parameters if you want to, but they will all run /bin/echo $ docker run test Hi Then running it will produce $ docker build -t test. So if your Dockerfile contains: FROM ubuntu:16.04 If you specify an ENTRYPOINT directive, Docker will use that executable, and the CMD directive specifies the default parameter(s) of the command. You can override CMD on the command line, in which case it will run the command you have specified. Once you run this image then it will by default print out the current date $ docker build -t test. The command of your container process will be /bin/sh -c /bin/date. Then you are using the default ENTRYPOINT directive of /bin/sh -c, and running /bin/date with that default entrypoint. If you specify both, then the ENTRYPOINT specifies the executable of your container process, and CMD will be supplied as the parameters of that executable.įor example if your Dockerfile contains FROM ubuntu:16.04 You can override either or both the entrypoint and/or the command when you start up the built image. If you only specify CMD then docker will run that command using the default ENTRYPOINT, which is /bin/sh -c. There are two Dockerfile directives to specify what command to run by default in built images. passing secret data to a running container.Multiple processes in one container instance.How to Setup Three Node Mongo Replica using Docker Image and Provisioned using Chef.Docker private/secure registry with API v2.Docker -net modes (bridge, hots, mapped container and none).docker inspect getting various fields for key:value and elements of list. Pushing and Pulling an Image to Docker Hub or another Registry.ENTRYPOINT and CMD seen as verb and parameter.
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