# Cheat Sheet

## Cluster Formation and Peer Discovery

If you have a Kubernetes cluster with node auto scaling, nodes will be added and removed dynamically, in this case RabbitMQ must have the following plugins:

{% code title="/etc/rabbitmq/enabled\_plugins" %}

```
[
  rabbitmq_shovel,
  rabbitmq_shovel_management,
  rabbitmq_federation,
  rabbitmq_federation_management,
  rabbitmq_top,
  rabbitmq_peer_discovery_k8s,
  
  rabbitmq_stomp,
  rabbitmq_web_stomp,

  rabbitmq_consistent_hash_exchange,
  rabbitmq_management,
  rabbitmq_peer_discovery_k8s
  
].
```

{% endcode %}

{% code title="/etc/rabbitmq/rabbitmq.conf" %}

```
## Clustering
cluster_formation.peer_discovery_backend  = rabbit_peer_discovery_k8s
cluster_formation.k8s.host = kubernetes.default.svc.cluster.local
cluster_formation.k8s.address_type = hostname
cluster_formation.node_cleanup.interval = 10
# Set to false if automatic cleanup of absent nodes is desired.
# This can be dangerous, see http://www.rabbitmq.com/cluster-formation.html#node-health-checks-and-cleanup.
cluster_formation.node_cleanup.only_log_warning = true
cluster_partition_handling = autoheal

management.load_definitions = /etc/definitions/definitions.json

## Memory-based Flow Control threshold
vm_memory_high_watermark.absolute = 4096MB
```

{% endcode %}

### References

<https://www.rabbitmq.com/cluster-formation.html#peer-discovery-k8s>


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