I have a Concourse Pipeline with a Task using a Docker image that is stored in our local Artifactory server. Every time I start the Pipeline it takes about 5 mins until the tasks are finally run. The log looks like this:

I assume that Concourse somehow checks for newer versions of the Docker image. Unfortunately I have no chance to debug since all the logfiles on the Concourse worker VM offer no usable information.

My Questions:

1. How can I possibly debug what's going on, when Concourse says "preparing build" and the status is "pending".

2. Is there any chance to avoid Concourse from checking for a newer version of the Docker image? I tagged the Docker image with version latest - might this be an issue?

3. Any further ideas how I could speed things up?

Here is the detailed configuration of my pipeline and tasks:

pipeline.yml:

---
resources:
- name: concourse-image
  type: docker-image
  source:
    repository: OUR_DOMAIN/subpath/concourse
    username: ...
    password: ...
    insecure_registries:
    - OUR_DOMAIN

# ...

jobs:
- name: deploy
  public: true
  plan:
  - get: concourse-image
  - task: create-manifest
    image: concourse-image
    file: concourse/tasks/create-manifest/task.yml
    params:
      # ...

task.yml:

---
platform: linux

inputs:
- name: git
- name: concourse

outputs:
  - name: deployment-manifest

run:
  path: concourse/tasks/create-and-upload-cloud-config/task.sh