Günay's Coding World

let’s clarify some terminology that is used frequently in the Docker ecosystem. Images   - The file system and configuration of our application which are used to create containers. To find out more about a Docker image, run  docker image inspect alpine .  Containers   - Running instances of Docker images — containers run the actual applications. A container includes an application and all of its dependencies. It shares the kernel with other containers, and runs as an isolated process in user space on the host OS. You created a container using  docker run  which you did using the alpine image that you downloaded. A list of running containers can be seen using the  docker container ls  command. Docker daemon  - The background service running on the host that manages building, running and distributing Docker containers. Docker client  - The command line tool that allows the user to interact with the Docker daemon. Docker Sto...

Dockerfile is a text document that containes all the commands a user could call on the command line to assemble an image. Using docker build users can create ana automated build that executes several command-line instructions in succession. Whenever possible, Docker will reuse the intermediate images(cache), to accelerate the docker build process significantly. Here is the format of the Dockerfile: # Comment INSTRUCTION arguments A Dockerfile must start with a "FROM" instruction FROM  -> Used to specify the base image from your custome image USER   -> User that will run the container ADD    -> Copy some file in your current directory into some dir inside the image EXPOSE -> informs Docker that the container listens on the specified network ports at runtime RUN  -> run some commands in the container CMD -> command that will be executed when the container started WORKDIR -> The working directory of the running container E...