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Run Container Actions

RunContainer

This action enables the user to run its own container with a provided command. The user can pass environment variables to the container so they are mapped. Blink supports running a container which is hosted on a public registry.

This action is not supported on Blink Cloud Runner.

Kubernetes Runner​

Running a container on Kubernetes Runner creates a job with a Pod Spec that contains the provided image, command, and environment variables. The job is executed before the step timeout is reached and returns the logs back to the user. When running a container image stored on a private registry, provide the Registry Credentials, and the runner will create Kubernetes secrets to use as ImagePullSecrets for the pod to be able to pull the image.

Docker Runner​

Running a container on Docker Runner deploys a container with the provided command and environment variables attached to it. The container stays alive until it finishes executing the command, or step timeout is reached. When running a container image stored on a private registry, provide the Registry Credentials, the runner will pull the image using credentials before running the container.

Using images from private repositories​

Use images from a private repositories by defining a connection to an external repo.

  1. Click Select connection > Create New Connection.
  2. Define the requested parameters.
    • Name: Connection name
    • Connection Type: Registry Credentials
    • Registry URL: The URL of the private repository
    • Username: Your private repository username
    • Password: Your private repository password

RunContainer

A connection is created using credentials, enabling the use of images from a private repository.

RunContainer

Files Support​

The optional Files Mount Path parameter sets the absolute path of a directory to which all persistent execution files are written before the container starts running (e.g. with the Download File From A URL. Files can also be created/updated in this path, and all changes will be reflected in the persistent execution files (e.g, creating a new file will make that file available in subsequent steps and updating files created in previous steps will persist the updates).

To make sure that your container can indeed access the files as expected, make sure that your container is running with group id 0 (and preferably also with user id 9193, which can be achieved by making sure that the last user instruction in your Dockerfile is USER 9193:0)

info

Unlike files created by other actions (e.g. with the Download File From A URL, files created with Run Container actions are not available in the Variable Picker, but can still be referenced in the expression language exactly like other files using the get_file function, and they have the same exact attributes (path, size and identifier), e.g. {{get_file('file.txt').identifier}}.