How to fix “No docker image specified by the instance config or repository” error when executing

dagster job backfill

?

The error message "No docker image specified by the instance config or repository" suggests that Dagster is unable to find a Docker image configuration for executing the job. To resolve this issue, you need to ensure that the Docker image is correctly specified in your Dagster instance configuration or within the repository code that defines the job. Here are the steps you can take to fix this issue: 1. Check the Instance Configuration: Ensure that your

dagster.yaml

(the instance configuration file) specifies the Docker image to use for launched jobs. The

job_image

field should be set to the Docker image you want to use. For example:

yaml
run_launcher:
  module: dagster_k8s.launcher
  class: K8sRunLauncher
  config:
    job_image: "<http://mycompany.com/dagster-k8s-image:latest|mycompany.com/dagster-k8s-image:latest>"
    # ... other configuration ...

2. Check the Repository Code: If the Docker image is not specified in the instance configuration, Dagster will attempt to use the image that was used to originally load the Dagster repository. Make sure that the repository code specifies the Docker image if it's not set in the instance configuration. 3. Check Environment Variables: If you are using environment variables to specify the Docker image, ensure that they are correctly set in the environment where the Dagster daemon or the command is running. 4. Check Permissions: If the Docker image is stored in a private registry, ensure that you have the correct permissions and that any required

image_pull_secrets

are configured to allow Dagster to pull the image. 5. Validate the Docker Image: Make sure that the Docker image exists and is accessible from where you are running the

dagster job backfill

command. You can test this by manually pulling the image using the Docker CLI. If you've checked all the above and the issue persists, you may want to look at the specific job definition to ensure it's not overriding the Docker image configuration or missing it entirely. Remember to apply these configurations in accordance with your deployment setup and the specifics of your Dagster instance and repository. If you need further assistance, please refer to the documentation or check for any relevant issues or discussions in the Dagster community that might provide additional context or solutions. Dagster-ecs unable to find dagster_postg... button Thank you for your feedback!