As an example, we'll check out the layers of the python:3.6 image. So first run:

docker pull python:3.6

And use docker history to show the layers.

docker history python:3.6

The output of this command will show you details about how each layer was created and the size:

IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
a5b7afcfdcc8        2 months ago        /bin/sh -c #(nop)  CMD ["python3"]              0B
<missing>           2 months ago        /bin/sh -c set -ex;   wget -O get-pip.py 'ht…   6MB
<missing>           2 months ago        /bin/sh -c #(nop)  ENV PYTHON_PIP_VERSION=10…   0B
<missing>           2 months ago        /bin/sh -c cd /usr/local/bin  && ln -s idle3…   32B
<missing>           2 months ago        /bin/sh -c set -ex  && buildDeps='   dpkg-de…   67.3MB
<missing>           2 months ago        /bin/sh -c #(nop)  ENV PYTHON_VERSION=3.6.5     0B
<missing>           2 months ago        /bin/sh -c #(nop)  ENV GPG_KEY=0D96DF4D4110E…   0B
<missing>           2 months ago        /bin/sh -c apt-get update && apt-get install…   8.73MB
<missing>           2 months ago        /bin/sh -c #(nop)  ENV LANG=C.UTF-8             0B
<missing>           2 months ago        /bin/sh -c #(nop)  ENV PATH=/usr/local/bin:/…   0B
<missing>           2 months ago        /bin/sh -c set -ex;  apt-get update;  apt-ge…   556MB
<missing>           2 months ago        /bin/sh -c apt-get update && apt-get install…   142MB
<missing>           2 months ago        /bin/sh -c set -ex;  if ! command -v gpg > /…   7.8MB
<missing>           2 months ago        /bin/sh -c apt-get update && apt-get install…   23.2MB
<missing>           3 months ago        /bin/sh -c #(nop)  CMD ["bash"]                 0B
<missing>           3 months ago        /bin/sh -c #(nop) ADD file:9572fdb59dfbb9b03…   101MB
Tyler Tyler (304)
0

In this short guide, we'll learn how to install Docker Engine on any platform. Before we begin, we should make the distinction between Docker Engine (Enterprise) and Docker Engine (Community).