- Beginner
- Building images
How it works
Docker runs ENTRYPOINT followed by CMD. Anything typed after the image name in docker run replaces CMD; --entrypoint replaces ENTRYPOINT. An image that sets neither inherits those of its base image, which may not be what you want.
What breaks
Write them in exec form, a JSON array with double quotes. The shell form runs your program under /bin/sh -c, which swallows stop signals, and single quotes in the array silently turn it back into shell form.
In a Dockerfile
ENTRYPOINT ["node", "src/cli.js"]
CMD ["--help"]See it break, then fix it
Write the Dockerfile or the compose file, type the docker commands, and watch a simulated server run them through reboots, upgrades and traffic. Free to start.