Besides the network plug-in and ingress controllers, you can define any add-on that you want deployed after the Kubernetes cluster is deployed.

There are two ways that you can specify an add-on.

Note: When using user-defined add-ons, you must define a namespace for all your resources, otherwise they will end up in the kube-system namespace.

RKE uploads the YAML manifest as a configmap to the Kubernetes cluster. Then, it runs a Kubernetes job that mounts the configmap and deploys the add-on using kubectl apply -f.

RKE only adds additional add-ons when using rke up multiple times. RKE does not support removing of cluster add-ons when doing rke up with a different list of add-ons.

As of v0.1.8, RKE will update an add-on if it is the same name.

Prior to v0.1.8, update any add-ons by by using kubectl edit.

In-line Add-ons

To define an add-on directly in the YAML file, make sure to use the YAML’s block indicator |- as the addons directive is a multi-line string option. It’s possible to specify multiple YAML resource definitions by separating them using the --- directive.

addons: |-
    ---
    apiVersion: v1
    kind: Pod
    metadata:
      name: my-nginx
      namespace: default
    spec:
      containers:
      - name: my-nginx
        image: nginx
        ports:
        - containerPort: 80

Referencing YAML files for Add-ons

Use the addons_include directive to reference a local file or a URL for any user-defined add-ons.

addons_include:
    - https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/operator.yaml
    - https://raw.githubusercontent.com/rook/rook/master/cluster/examples/kubernetes/ceph/cluster.yaml
    - /opt/manifests/example.yaml
    - ./nginx.yaml