Docker

Dockerfile

File named dockerfile with no file extension that contains instructions for building the image.

Help

run docker to see a list of commands. Then docker <command> --help to get help on individual commands.

Pull to pull an image or build to build from a dockerfile

• docker pull mcr.microsoft.com/powershell:lts-debian-10
  • pulls image mcr.microsoft.com/powershell with tag lts-debian-10
• docker build -t linux-powershell .
  • builds from dockerfile in current folder (".") and tags with linux-powershell.

This generates an image. Then it needs to be Run or Created to get a container which can then be started.

Run to create and start or start to just start an existing containter

• docker run -it --name linux-powershell linux-powershell
  • creates and starts a docker container based on given image, names it linux-powershell and sets it to interactive so standard in/out is written from/to console.
  • can also be a remote image: docker run -it --name linux-powershell mcr.microsoft.com/powershell:lts-debian-10
• docker start -i linux-powershell
  • starts the container mentioned above.

See also rancher