# Cluster Requirements

## Kubernetes version

Running Akamas requires a cluster running Kubernetes version 1.23 or higher.

## Resources requirements

Akamas can be deployed in three different sizes depending on the number of concurrent optimization studies that will be executed. If you are unsure about which size is appropriate for your environment we suggest you start with the small one and upgrade to bigger ones as you expand the optimization activity to more applications.

The tables below report the required resources both for requests and limits that should be available in the cluster to use Akamas.

**Small**

The small tier is suited for environments that needs to support up to 10 concurrent optimization studies

| Resource   | Requests  | Limits    |
| ---------- | --------- | --------- |
| CPU        | 2.5 Cores | 4.5 Cores |
| Memory     | 16 GB     | 18GB      |
| Disk Space | 70 GB     | 70 GB     |

## Storage requirements

The cluster must provide the definition of a *Storage Class* so that the application installation can leverage *Persistent Volume Claims* to dynamically provision the volumes required to persist data.

For more information on this topic refer to [Kubernetes' official documentation](https://kubernetes.io/docs/concepts/storage/persistent-volumes/).

## Permissions

To work properly, Akamas needs to manage some resources inside the *Namespace*. For this reason, it is recommended to run Akamas in a dedicated *Namespace*.

To manage resources, Akamas uses a *ServiceAccount* bound to the application's pods, which must be created either manually by the cluster administrator or automatically by the provided Helm chart.

This snippet describes the namespaced required permissions for the service account:

```yaml
- apiGroups: ["batch"]
  resources:
    - jobs
  verbs: ["get", "list", "create", "delete", "patch", "update"]
- apiGroups: [""]
  resources:
    - configmaps
  verbs: ["get", "list", "create", "delete", "patch", "update"]
- apiGroups: [""]
  resources:
    - pods
  verbs: ["get", "list", "patch", "update", "watch"]
- apiGroups: [""]
  resources:
    - pods/log
  verbs: ["get"]
- apiGroups: [""]
  resources:
    - secrets
  verbs:
    - get
    - create
    - patch
```

## Networking

Networking requirements depend on how users interact with Akamas. Services can be exposed via *Ingress*, *LoadBalancers*, *NodePorts,* or [using *kubectl* as a proxy](https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/). Refer to [Accessing Akamas](https://docs.akamas.io/akamas-docs/3.2.0/installing-akamas/kubernetes/accessing-akamas) for a more detailed description of the available options.