Docker file syntax

 File name must be " Dockerfile"  without any extension

Dockerfile Content example:

    FROM <Docker_registry>/commerce/ts-web:<source_image_tag>

    RUN  command some command

    RUN command some other

   COPY     /opt/source-code /var/container/folder/source-code

   ENTRYPOINT  {"command","param"]

=== example seep for 10 sec on container start up ==

ENTRYPOINT  ["sleep"]

CMD ["10"]

Docker commands cheat sheet

Docker commands list that can be executed on docker host

1. docker login 

  provide username and password when prompted

2. docker pull dockerImageName   ( here default library or registry name is "library" otherwise use syntax "username/dockerImageName", it pulls image but not run)

3. docker run -it -p 80:3000 -p 8080:3000 -v /opt/my-host-folder: /var/inside/docker/container/folder-name username/dockerImageName

 here  -i attach host input to docker container

          -t attach host terminal to docker container to see output

  -p port mapping host-port:container internal port

  -v volume mapping host-volume-path: container internal volume path

4. docker run -d username/dockerImageName ( run docker in background in detached mode)   

5. docker run -attach username/dockerImageName ( run docker in foreground in attached mode)

6. docker ps -a ( list all container processes running)

7. docker images ( list all docker images on docker host)

8. docker stop  dockercontinerName  ( stop docker container)

9. docker rm dockercontinerName ( delete docker container dockercontinerName or dockerId can be used)

10. docker rmi username/dockerImageName ( delete docker image, make sure first stop any running container of this image)

11. docker inspect dockercontinerName   ( view details of docker container config like ip address port running etc.)

12. docker build Dockerfile -t username/dockerImageName ( build docker with tag as username/dockerImageName)

13. docker push username/dockerImageName ( push docker to public docker hub registry under your user, make sure you are logged in first using docker login command)

14. docker pull username/dockerImageName:source_image_tag

15. docker run --entrypoint command-name username/dockerImageName ( overwrite docker container entry point command at rum time when docker container started)

16.  docker run -e ENV-VAR-NAME=VALUE username/dockerImageName ( export or set environment variable to be passed to docker container at start up)

Note: username above could be docker registry name