06-docker.adoc

Docker

Docker: Why ?

Docker: What ?

Docker How ?

Docker: Dockerfile

• Dockerfile: recipe for building your immutable image

FROM debian:jessie
LABEL Maintainer="Damien DUPORTAL"

RUN apt-get update && apt-get install -y nginx

VOLUME ["/tmp","/app"]

EXPOSE 80

ENTRYPOINT ["/usr/sbin/nginx"]
CMD ["-g","daemon off;"]

Docker: Building Docker Image

• Using the docker CLI:

docker build -t my_image:1.0.0 ./

Docker: Running a Docker

• Using the docker CLI:

docker run -P -d my_image:1.0.0

Docker: Demo Application’s Dockerfile

• Using GitServer, from the repository root

  • Check the Dockerfile content

Docker: Building Demo Application

• Using Devbox, from the demoapp work directory’s root

  • Checking images with docker images

  • Build an image named demoapp:latest

  • Check again images

Docker: Running Docker Container

• Check running containers with docker ps

• Run and test the container with this command:

  docker run -p {demo-docker-port}:8080 -d my_image:1.0.0
  # Then open http://{external-domain}:{demo-docker-port}[]

• Check again running containers with docker ps

• Stop it with docker stop <Container ID>

• Check again running containers with docker ps

Docker: Build and Smoke Test

• It is a lot of command !

• What about testing the Docker Image ?

• The demoapp contains a testing system:

  • It use Bats

  • Files: ./src/test/bats/*.bats

  • Command:

/usr/local/bin/bats ./src/test/bats/docker.bats

That’s all folks !