![]() ![]() Pass it the name you used in the build step. ![]() ![]() Run Your Docker Imageĭocker run creates a container using your image. Once it’s done, the image is placed in your local Docker repository. The second argument, -t, is a tag to use to refer to the image.Īs you can see, Docker prints out each directive in your Dockerfile. It expects to find a file named Dockerfile in the working directory. Removing intermediate container 3977b48d8273ĭocker build is the command for building an image. Sending build context to Docker daemon 2.048kB Each string must be its own item in the array. Note that “-c print(‘Hi there!’)” wouldn’t work. The -c argument tells Python that the code you want executed follows. The image puts Python in the search path, so you can call it without worrying about where it’s located. You’re running Python with a one-line program. The first is the executable, and the rest are the arguments it will pass to Python. The second line contains the command that Docker will run by default when this image is loaded. In this case, we’re using the lightweight Alpine Linux distribution with the latest version of Python installed and ready to go. Over at Docker Hub, you can find images with almost any Linux distribution and with almost any software package ready to use. ![]() Your Dockerfile will always start with a FROM line. The first line tells Docker which image to start building with. A Dockerfile contains a list of directives describing how to build your image.Ĭreate a text file named Dockerfile with these contents.ĬMD Start with an empty directory and create your first Dockerfile. That’s your first lesson! You can use Docker to run software that isn’t installed on the host system. You’ll be running Python inside your Docker containers, but you don’t need Python installed on your development system. ![]()
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