How to Build Container Images

Container images are built in layers. This allows for shared layers between images and lower actual storage on device.

Images are typically created using dockerfile

In a docker file, each line starts with a command, followed by params.

Some of the most common commands are -

1. FROM - specify the base image
2. RUN - run a command inside the container
3. COPY - copy files into a container
4. ENV - specify environment variable
5. ENTRYPOINT - initial process for the container
6. CMD - default params for the initial process

docker build can then be used to build the image.