The container stops when there's no process running in it. In fact, a container is running only when it has a process running (and normally it's only a single process). python and some file main.py.Īnd the container itself (in contrast to the container image) is the actual running instance of the image, comparable to a process.
Those changes will exist only in that container, but would not persist in the underlying container image (would not be saved to disk).Ī container image is comparable to the program file and contents, e.g. When the container is started and running (started from a container image) it could create or change files, environment variables, etc. In contrast to a " container image" that is the stored static contents, a " container" normally refers to the running instance, the thing that is being executed. Static here means that the container image is not running, it's not being executed, it's only the packaged files and metadata. What is a Container Image ¶Ī container is run from a container image.Ī container image is a static version of all the files, environment variables, and the default command/program that should be present in a container. This way, containers consume little resources, an amount comparable to running the processes directly (a virtual machine would consume much more).Ĭontainers also have their own isolated running processes (commonly just one process), file system, and network, simplifying deployment, security, development, etc. This just means that they are very lightweight (compared to full virtual machines emulating an entire operating system). Linux containers run using the same Linux kernel of the host (machine, virtual machine, cloud server, etc). RUN pip install -no-cache-dir -upgrade -r /code/requirements.txtĬMD # If running behind a proxy like Nginx or Traefik add -proxy-headers # CMD What is a Container ¶Ĭontainers (mainly Linux containers) are a very lightweight way to package applications including all their dependencies and necessary files while keeping them isolated from other containers (other applications or components) in the same system. Number of Processes on the Official Docker ImageĪlternatives, Inspiration and ComparisonsįROM python:3.9 WORKDIR /code COPY. Official Docker Image with Gunicorn - Uvicorn Previous Steps Before Starting and Containers One Load Balancer - Multiple Worker ContainersĬontainers with Multiple Processes and Special Cases OAuth2 with Password (and hashing), Bearer with JWT tokensĬustom Response - HTML, Stream, File, othersīuild a Docker Image with a Single-File FastAPI Dependencies in path operation decorators
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