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Concourse Lab Creation

Testing Environment

Running Concourse

With Docker-Compose

This docker-compose file simplifies the installation to do some tests with concourse:

wget https://raw.githubusercontent.com/starkandwayne/concourse-tutorial/master/docker-compose.yml
docker-compose up -d

You can download the command line fly for your OS from the web in 127.0.0.1:8080

With Kubernetes (Recommended)

You can easily deploy concourse in Kubernetes (in minikube for example) using the helm-chart: concourse-chart.

brew install helm
helm repo add concourse https://concourse-charts.storage.googleapis.com/
helm install concourse-release concourse/concourse
# concourse-release will be the prefix name for the concourse elements in k8s
# After the installation you will find the indications to connect to it in the console

# If you need to delete it
helm delete concourse-release

After generating the concourse env, you could generate a secret and give a access to the SA running in concourse web to access K8s secrets:

echo 'apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: read-secrets
rules:
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get"]

---

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: read-secrets-concourse
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: read-secrets
subjects:
- kind: ServiceAccount
  name: concourse-release-web
  namespace: default
  
---

apiVersion: v1
kind: Secret
metadata:
  name: super
  namespace: concourse-release-main
type: Opaque
data:
  secret: MWYyZDFlMmU2N2Rm

' | kubectl apply -f -

Create Pipeline

A pipeline is made of a list of Jobs which contains an ordered list of Steps.

Steps

Several different type of steps can be used:

the task step runs a task
the get step fetches a resource
the put step updates a resource
the set_pipeline step configures a pipeline
the load_var step loads a value into a local var
the in_parallel step runs steps in parallel
the do step runs steps in sequence
the across step modifier runs a step multiple times; once for each combination of variable values
the try step attempts to run a step and succeeds even if the step fails

Each step in a job plan runs in its own container. You can run anything you want inside the container (i.e. run my tests, run this bash script, build this image, etc.). So if you have a job with five steps Concourse will create five containers, one for each step.

Therefore, it's possible to indicate the type of container each step needs to be run in.

Simple Pipeline Example

jobs:
- name: simple
  plan:
  - task: simple-task
    privileged: true
    config:
      # Tells Concourse which type of worker this task should run on
      platform: linux
      image_resource:
        type: registry-image
        source:
          repository: busybox # images are pulled from docker hub by default
      run:
        path: sh
        args:
        - -cx
        - |
          sleep 1000
          echo "$SUPER_SECRET"          
      params:
        SUPER_SECRET: ((super.secret))

fly -t tutorial set-pipeline -p pipe-name -c hello-world.yml
# pipelines are paused when first created
fly -t tutorial unpause-pipeline -p pipe-name
# trigger the job and watch it run to completion
fly -t tutorial trigger-job --job pipe-name/simple --watch
# From another console
fly -t tutorial intercept --job pipe-name/simple

Check 127.0.0.1:8080 to see the pipeline flow.

Bash script with output/input pipeline

It's possible to save the results of one task in a file and indicate that it's an output and then indicate the input of the next task as the output of the previous task. What concourse does is to mount the directory of the previous task in the new task where you can access the files created by the previous task.

Triggers

You don't need to trigger the jobs manually every-time you need to run them, you can also program them to be run every-time:

Some time passes: Time resource
On new commits to the main branch: Git resource
New PR's: Github-PR resource
Fetch or push the latest image of your app: Registry-image resource

Check a YAML pipeline example that triggers on new commits to master in https://concourse-ci.org/tutorial-resources.html