![]() In this situation, when running the container, we'll see how Docker ignores any arguments passed to either docker run or cmd. build-arg PORT8005 Run docker container: docker run -p 8005:8005 -d test:1.0 BUT I need to pass the port during RUN not during build (this is not working and its taking 8004) Create docker image: docker build -t test:1.0. Let's update the entrypoint in our Dockerfile. Create docker image: docker build -t test:1.0. docker-entrypoint.sh mysqld Up 3306/tcp 1basicswordpress1. Something to note is the different behavior of entrypoint when used in its shell form. Executing Docker Compose will automatically create a Docker network and run the containers. We can also override them if we choose so: $ docker run myimage custom event Now, let's run our container without providing any arguments, and with the defaults specified in cmd: $ docker run myimage Let's add a cmd entry after entrypoint in our Dockerfile. One such use-case is to define default arguments for entrypoint. Let's now move on and see how to use cmd and entrypoint in combination. We have used both cmd and entrypoint to define the command executed when running the container. ![]() That's because only the last cmd is invoked if more than one is specified. ĬMD Īfter building the image and running the container again, we'll find the following output: $ docker run myimageĪs we can see, the container started entry is not present, only the container running is. docker-compose build builder will build image and set entrypoint to ENTRYPOINT 'test.sh' set in Dockerfile. Let's add a new entry that will display another message. ENTRYPOINT 'test.sh' is set in Dockerfile describing docker image entrypoint: 'entrypoint.sh' is set in docker-compose file which describes multicontainer environment while referencing the Dockerfile. Let's move on now and see what happens if we have more than one cmd entry in the Dockerfile. That's because we have specified arguments to the docker run command. This time the cmd specified in the Dockerfile is ignored. Let's see what happens if we run the same command as before: $ docker run myimage cat log.txt Notice we've used a slightly different docker run command to start our container this time.
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