Building images with a Dockerfile

Our first Dockerfile

# Version: 0.0.1
FROM ubuntu:14.04
MAINTAINER James Turnbull "james@example.com"
RUN apt-get update
RUN apt-get install -y nginx
RUN echo 'Hi, I am in your container' \
       >/usr/share/nginx/html/index.html
EXPOSE 80



The Dockerfile contains a series of instructions paired with arguments. Each instruction, for example FROM, should be in upper-case and be followed by an argument: FROM ubuntu:14.04. Instructions in the Dockerfile are processed from the top down, so you should order them accordingly.

Each instruction adds a new layer to the image and then commits the image.

Building the image from our Dockerfile

$ sudo docker build -t="jamtur01/static_web" .

Sending build context to Docker daemon 2.56 kB

Sending build context to Docker daemon

Step 0 : FROM ubuntu:14.04

---> ba5877dc9bec

Step 1 : MAINTAINER James Turnbull "james@example.com"

---> Running in b8ffa06f9274

---> 4c66c9dcee35

Pushing images to the Docker Hub

We push images to the Docker Hub using the docker push command.

$ sudo docker push jamtur01/static_web

The push refers to a repository [jamtur01/static_web] (len: 1)

Processing checksums

Sending image list

Pushing repository jamtur01/static_web to registry-1.docker.io (1↩

tags)

. . .

SOURCE:TheDockerBook by James Turnbull