Update: July 26, 2019
This section of the forum is now closed; we are working on a new support model for WDL that we will share here shortly. For Cromwell-specific issues, see the Cromwell docs and post questions on Github.

unable to do docker lookup

afriedenafrieden Cambridge, MAMember
edited October 2018 in Ask the Cromwell + WDL Team

Hi Cromwell Team,
Trying to get hello world working on AWS Batch and cromwell.

I am able to spin up the servers however it fails in pulling the docker image with the following error message in the cromwell logs:

2018-10-30 15:43:14,845 cromwell-system-akka.dispatchers.engine-dispatcher-9 WARN - BackendPreparationActor_for_7d0c30ad:wf_hello.hello:-1:1 [UUID(7d0c30ad)]: Docker lookup failed java.lang.Exception: Failed to get docker hash for ubuntu:latest Docker hash lookup failed with code 503. The server is currently unavailable (because it is overloaded or down for maintenance). at cromwell.engine.workflow.WorkflowDockerLookupActor.cromwell$engine$workflow$WorkflowDockerLookupActor$$handleLookupFailure(WorkflowDockerLookupActor.scala:188)

Here is my wdl:

   task hello {
        String addressee
      command {
        echo "Hello ${addressee}! Welcome to Cromwell on AWS"
      output {
        String message = read_string(stdout())
      runtime {
        docker: "ubuntu:latest"

  workflow wf_hello {
    call hello

    output {

Any idea how to resolve this error? This is taken from the tutorial here:

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