README.md

35 - Push Docker image

This section will show how to take a Dockerfile project, build it and push to Docker Hub.

Define a docker image

This section's subfolder docker containers a Dockerfile and a simple hello-world command:

FROM busybox

ADD hello-world /bin/hello-world

ENTRYPOINT ["/bin/hello-world"]
CMD ["world"]

Create a docker container image

We could manually create a docker image and push it to Docker Hub. But since we have concourse we will use it instead.

The pipeline for this section is to put a docker-image resource.

The pipeline is below:

jobs:
- name: job-publish
  public: true
  serial: true
  plan:
  - get: resource-tutorial
  - put: hello-world-docker-image
    params:
      build: resource-tutorial/35_push_docker_image/docker

resources:
- name: resource-tutorial
  type: git
  source:
    uri: https://github.com/drnic/concourse-tutorial.git

- name: hello-world-docker-image
  type: docker-image
  source:
    email: {{docker-hub-email}}
    username: {{docker-hub-username}}
    password: {{docker-hub-password}}
    repository: {{docker-hub-image-hello-world}}

Since the source Dockerfile is actually within this tutorial's own git repo, we will use this tutorial repo as the input resource called resource-tutorial. In the job job-publish build plan we get it first; and it is used by the hello-world-docker-image docker-image resource next.

This means the docker subfolder in this tutorial section will be available at folder resource-tutorial/35_push_docker_image/docker during the build plan (resource-tutorial is the name of the resource within the job build plan; and 35_push_docker_image/docker is the subfolder where the Dockerfile is located).

Running the pipeline

Your credentials.yml now needs your Docker Hub account credentials (see credentials.example.yml):

docker-hub-email: EMAIL
docker-hub-username: USERNAME
docker-hub-password: PASSWORD
docker-hub-image-hello-world: USERNAME/hello-world

The run.sh will create the pipeline.yml and upload it to Concourse, and trigger the job:

cd ../35_push_docker_image
./run.sh ../credentials.yml

This will create a docker image <username>/hello-world on Docker Hub.

Using the docker image

In the next tutorial section we will fetch and run the <username>/hello-world container image.