K8S - Memory requests and limits of RabbitmqCluster pods at a minimum of 500Mi - why?

[Rilind Harizaj]

Hello all,

I am currently trying to set up a three-node RabbitMQ Cluster in my local one node K8s Cluster provided by Docker Desktop. The version of the cluster is 1.25.

In this version, I am using the resource template below to generate a one node cluster for testing:

apiVersion: rabbitmq.com/v1beta1

kind: RabbitmqCluster

metadata:

  name: testrabbit

  namespace: rabbitmq-system

spec:

  replicas: 1 # ein Cluster mit 3 Knoten

  persistence: # die Daten werden nicht persistiert, sollte dementsprechend angepasst werden

    storage: 0Gi

  resources: # die Ressourcen für jeden Pod.

    requests:

      cpu: 250m

      memory: 256Mi

    limits:

      cpu: 250m

      memory: 256Mi

  rabbitmq:

    additionalPlugins:

      - rabbitmq_stream

Despite my declared memory requests and limits, describing the node via kubectl yields the following resource limits for the one pod generated:
rabbitmq-system             testrabbit-server-0                          250m (4%)     250m (4%)   500Mi (26%)      500Mi (26%)    23m

Why is this the case? It would seem that each pod is allocated a minimum of 500Mi. Is there an opinionated setting that is overriding my set limits?

I am fairly new to both K8S and RabbitMQ, so any help would be appreciated.

Best,

Rilind

[Michal Kuratczyk]

Looks like the init container has this hardcoded (your "rabbitmq" container should have the limits you set, it's just the init container that uses 500<B).

You can adjust it with:

```

  override:
    statefulSet:
      spec:
        template:
          spec:
            containers: []
            initContainers:
              - name: setup-container
                resources:
                  limits:
                    cpu: ...
                    memory: ...
                  requests:
                    cpu: ...
                    memory: ...

```

We should probably reduce this hardcoded value. I don't think it needs anything near 500MB. A PR to the cluster-operator (with some testing)

would be appreciated.

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Michal

RabbitMQ Team

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[Rilind Harizaj]

Hello,

I understand, thank you for the prompt response!

Best,

Rilind