EB Worker cron.yaml - is not authorized to perform

I have been trying to implement a cron job on my EB worker.

My EB CLI on a deploy says "ERROR: Update environment operation is complete, but with errors."

My yaml seems to parse just fine and in my EB events list I see the line "Successfully loaded 1 scheduled tasks from cron.yaml."

version: 1
cron:
 - name: "cron"
   url: "/cron"
   schedule: "* * * * *"

I look in the eb-activity.log and there is this issue:

Activity execution failed, because: User: arn:aws:sts::550612933446:assumed-role/WorkerTierRole_KK/i-5fe79aa0 is not authorized to perform: dynamodb:UpdateItem on resource: arn:aws:dynamodb:us-east-1:550612933446:table/awseb-e-jcrjmidtsu-stack-AWSEBWorkerCronLeaderRegistry-1GVA6A4AV0YDW - (Aws::DynamoDB::Errors::AccessDeniedException) (ElasticBeanstalk::ExternalInvocationError)
caused by: User: arn:aws:sts::550612933446:assumed-role/WorkerTierRole_KK/i-5fe79aa0 is not authorized to perform: dynamodb:UpdateItem on resource: arn:aws:dynamodb:us-east-1:550612933446:table/awseb-e-jcrjmidtsu-stack-AWSEBWorkerCronLeaderRegistry-1GVA6A4AV0YDW - (Aws::DynamoDB::Errors::AccessDeniedException) (Executor::NonZeroExitStatus)

This is what I also found in the log:

2015-06-04T02:17:19Z schedule-parser: Successfully loaded 1 scheduled tasks from file /opt/python/current/app/cron.yaml .
2015-06-04T02:17:19Z init: User: arn:aws:sts::550612933446:assumed-role/WorkerTierRole_KK/i-254d00f5 is not authorized to perform: dynamodb:UpdateItem on resource: arn:aws:dynamodb:us-east-1:550612933446:table/awseb-e-jcrjmidtsu-stack-AWSEBWorkerCronLeaderRegistry-1KMJ9BLOVIUSJ (Aws::DynamoDB::Errors::AccessDeniedException)
    at /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sdk-core-2.0.10/lib/seahorse/client/plugins/raise_response_errors.rb:15:in `call'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sdk-core-2.0.10/lib/aws-sdk-core/plugins/dynamodb_simple_attributes.rb:112:in `call'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sdk-core-2.0.10/lib/seahorse/client/plugins/param_conversion.rb:22:in `call'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sdk-core-2.0.10/lib/aws-sdk-core/plugins/response_paging.rb:10:in `call'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sdk-core-2.0.10/lib/seahorse/client/request.rb:70:in `send_request'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sdk-core-2.0.10/lib/seahorse/client/base.rb:215:in `block (2 levels) in define_operation_methods'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/vendor/AWSMACLE/lib/leader_election/storage_manager.rb:81:in `update_registration'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/vendor/AWSMACLE/lib/leader_election/storage_manager.rb:19:in `verify_table'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/vendor/AWSMACLE/lib/leader_election/daemon.rb:37:in `initialize'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/vendor/AWSMACLE/lib/leader_election.rb:8:in `new'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/vendor/AWSMACLE/lib/leader_election.rb:8:in `create'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/lib/aws-sqsd/cron.rb:241:in `leader_election_daemon'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/lib/aws-sqsd/cron.rb:30:in `initialize'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/lib/aws-sqsd/daemon.rb:44:in `new'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/lib/aws-sqsd/daemon.rb:44:in `initialize'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/bin/aws-sqsd:34:in `new'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/bin/aws-sqsd:34:in `start'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/bin/aws-sqsd:83:in `launch'
    from /opt/elasticbeanstalk/lib/ruby/lib/ruby/gems/2.1.0/gems/aws-sqsd-2.0/bin/aws-sqsd:111:in `<top (required)>'
    from /opt/elasticbeanstalk/lib/ruby/bin/aws-sqsd:23:in `load'
    from /opt/elasticbeanstalk/lib/ruby/bin/aws-sqsd:23:in `<main>'

I have tried rebuilding my environment but that didn't make any difference.

It seems like this error is out of my hands (hope that is not the case and I have made a simple mistake) and is an EB issue with how it handles cron jobs. I don't have any dynamodb's :)

Many thanks for any help, Phil

The cron worker uses a small dynamo db table behind the scenes to ensure only one instance in your auto scaling group executes the cron task. Hence you need to update your role policy to include relevant dynamo db permissions.