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Concurrency

Some workflows may need limits on how many can be run concurrently. This can be achieved using Argo's synchronization feature.

The desired limit can be added in a ConfigMap in config/semaphores.yml, e.g.

apiVersion: v1
kind: ConfigMap
metadata:
  name: semaphores
  namespace: argo
data:
  standardising: "2"

which shows a limit of 2 added to the key standardising. This can then be referenced by adding a synchronization section to the desired workflow, which refers to the ConfigMap name and key:

synchronization:
  semaphore:
    configMapKeyRef:
      name: semaphores
      key: standardising

Now Argo will only allow two instances of the workflow to run concurrently. Any further instances which are started while two are running will be queued, and start automatically when running workflows complete.