Addons

Addons are specific services and tools extending the functionality of Kubernetes/OpenShift.

Default Addons

Default addons are installed in each user-cluster in KKP. The default addons are:

Canal: policy based networking for cloud native applications
Dashboard: General-purpose web UI for Kubernetes clusters
DNS: Kubernetes DNS service
kube-proxy: Kubernetes network proxy
rbac: Kubernetes Role-Based Access Control, needed for TLS node bootstrapping
OpenVPN client: virtual private network (VPN). Lets the control plan access the Pod & Service network. Required for functionality like kubectl proxy & kubectl port-forward.
nodelocal-dns-cache: Improves DNS performance inside the user-cluster
logrotate: rotates logs on worker nodes
pod-security-policy: Policies to configure KKP access when PSPs are enabled
default-storage-class: A cloud provider specific StorageClass
kubelet-configmap: A set of ConfigMaps used by kubeadm

Installation and configuration of these addons is done by 2 controllers which are part of the KKP seed-controller-manager:

addon-installer-controller: Ensures a given set of addons will be installed in all clusters
addon-controller: Templates the addons & applies the manifests in the user clusters

From v2.18 on kubermatic-installer print can be used to generate a full default KubermaticConfiguration manifest.

Configuration

To configure which addons shall be installed in all user clusters, update the relevant KubermaticConfiguration in the spec.userCluster.addons section. For Kubernetes and OpenShift, configure a Docker image that contains the required addon manifests (as YAML files) and an AddonList manifest that lists the addons and their requirements. Take a look at the default configuration above as a starting point.

To deploy any changes, edit the KubermaticConfiguration in-place using kubectl edit or apply it from a file using kubectl apply. The KKP Operator will reconcile the installation and after a few moments your changes will take effect.

Accessible Addons

Accessible addons can be installed in each user-cluster in KKP on user demand (in contrast to regular addons, which are always installed and cannot be removed by the user). If an addon is both default and accessible, then it will be installed in the user-cluster, but also be visible to the user, who can manage it from the KKP dashboard like the other accessible addons. The accessible addons are:

node-exporter: Exports metrics from the node

Accessible addons can be managed in the UI from the cluster details view:

View

Configuration

To configure which addons shall be accessible, set the spec.api.accessibleAddons field inside the KubermaticConfiguration:

spec:
  api:
    accessibleAddons:
      - node-exporter

The dashboard’s view for managing addons can be configured by creating an AddonConfig custom resources. This can be used to control the addon’s icon, description and form fields to ask for rudimentary user input. It’s recommended to create an AddonConfig for each accessible addon.

AddonConfig resources are not namespaced. Make sure to not mix up addon configs if you run multiple KKP installations in the same cluster (which is not a recommended setup).

The following demonstrates an AddonConfig for the node-exporter addon. It configures a description and logo as well as some form fields (which in this case are not used by the addon itself).

apiVersion: kubermatic.k8s.io/v1
kind: AddonConfig
metadata:
  name: node-exporter
spec:
  description: "The Prometheus Node Exporter exposes a wide variety of hardware- and kernel-related metrics."
  logoFormat: "svg+xml"
  # The logo must be base64 encoded.
  logo: |+
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  formSpec:
    - displayName: Replicas
      internalName: replicas
      required: true
      type: number
      helpText: "Number of replicas."
    - displayName: Description
      internalName: desc
      required: false
      type: text
    - displayName: Debug
      internalName: debug
      required: false
      type: boolean
    - displayName: Spec
      internalName: spec
      required: false
      type: text-area
      helpText: "Use YAML format."

There is a short explanation of the single formSpec fields:

displayName is the name that is displayed in the UI as the control label.
internalName is the name used internally. It can be referenced with template variables (see the description below).
required indicates if the control should be required in the UI.
type indicates type of the control that will be displayed in the UI. Can be one of number, text, boolean and text-area.
helpText is the text that will be displayed in the UI next to the control. It can contain some hints for the end-users.

Each of the fields from the formSpec is then available using the .Variables template variable. See the section below for more information.

After applying above config the UI should look like below:

Form

Custom Addons

All manifests and config files for the default addons are stored in a Docker image, whose name is configured in the KubermaticConfiguration at spec.userClusters.addons.kubernetes.dockerRepository and spec.userClusters.addons.openshift.dockerRepository. These default to quay.io/kubermatic/addons and quay.io/kubermatic/openshift-addons, respectively.

Creating a Docker Image

Depending on the cluster orchestrator, choose the Kubernetes or OpenShift Docker image as the basis for your own image. All addon manifest are stored in /addons/<addonname>, e.g. /addons/kube-proxy. When creating your own image, copy the manifests into a directory below /addons.

Suppose you have this directory structure:

.
├─ Dockerfile
└─ my-custom-addon
   └─ deployment.yaml

A simple Dockerfile would be

FROM quay.io/kubermatic/addons:YOUR_KUBERMATIC_VERSION

ADD ./ /addons/

You can then build and push your customized addon image to a Docker registry of your choice:

export TAG=YOUR_KUBERMATIC_VERSION
docker build -t customer/addons:${TAG} .
docker push customer/addons:${TAG}

Manifest Templating

KKP treats each file in an addon directory (/addon/<addonname>) as a Go template, so it is possible to inject dynamic and user-cluster related information into addons at runtime. Please refer to the Go documentation for the exact templating syntax.

KKP injects an instance of the TemplateData struct into each template. The following Go snippet shows the available information:

// TemplateData is the root context injected into each addon manifest file.
type TemplateData struct {
	SeedName       string
	DatacenterName string
	Cluster        ClusterData
	Credentials    Credentials
	Variables      map[string]interface{}
}

// ClusterData contains data related to the user cluster
// the addon is rendered for.
type ClusterData struct {
	// Type is either "kubernetes" or "openshift".
	Type string
	// Name is the auto-generated, internal cluster name, e.g. "bbc8sc24wb".
	Name string
	// HumanReadableName is the user-specified cluster name.
	HumanReadableName string
	// Namespace is the full namespace for the cluster's control plane.
	Namespace string
	// OwnerName is the owner's full name.
	OwnerName string
	// OwnerEmail is the owner's e-mail address.
	OwnerEmail string
	// Labels are the labels users have configured for their cluster, including
	// system-defined labels like the project ID.
	Labels map[string]string
	// Annotations are the annotations on the cluster resource, usually
	// cloud-provider related information like regions.
	Annotations map[string]string
	// Kubeconfig is a YAML-encoded kubeconfig with cluster-admin permissions
	// inside the user-cluster. The kubeconfig uses the external URL to reach
	// the apiserver.
	Kubeconfig string
	// ApiserverExternalURL is the full URL to the apiserver service from the
	// outside, including protocol and port number. It does not contain any
	// trailing slashes.
	ApiserverExternalURL string
	// ApiserverExternalURL is the full URL to the apiserver from within the
	// seed cluster itself. It does not contain any trailing slashes.
	ApiserverInternalURL string
	// AdminToken is the cluster's admin token.
	AdminToken string
	// CloudProviderName is the name of the cloud provider used, one of
	// "alibaba", "aws", "azure", "bringyourown", "digitalocean", "gcp",
	// "hetzner", "kubevirt", "openstack", "packet", "vsphere" depending on
	// the configured datacenters.
	CloudProviderName string
	// Version is the exact cluster version.
	Version *semver.Version
	// MajorMinorVersion is a shortcut for common testing on "Major.Minor".
	MajorMinorVersion string
	// Network contains DNS and CIDR settings for the cluster.
	Network ClusterNetwork
	// Features is a set of enabled features for this cluster.
	Features sets.String
}

type ClusterNetwork struct {
	DNSDomain         string
	DNSClusterIP      string
	DNSResolverIP     string
	PodCIDRBlocks     []string
	ServiceCIDRBlocks []string
	ProxyMode         string
}

type Credentials struct {
	AWS          AWSCredentials
	Azure        AzureCredentials
	Digitalocean DigitaloceanCredentials
	GCP          GCPCredentials
	Hetzner      HetznerCredentials
	Openstack    OpenstackCredentials
	Packet       PacketCredentials
	Kubevirt     KubevirtCredentials
	VSphere      VSphereCredentials
	Alibaba      AlibabaCredentials
	Anexia       AnexiaCredentials
}

type AWSCredentials struct {
	AccessKeyID     string
	SecretAccessKey string
}

type AzureCredentials struct {
	TenantID       string
	SubscriptionID string
	ClientID       string
	ClientSecret   string
}

type DigitaloceanCredentials struct {
	Token string
}

type GCPCredentials struct {
	ServiceAccount string
}

type HetznerCredentials struct {
	Token string
}

type OpenstackCredentials struct {
	Username string
	Password string
	Tenant   string
	TenantID string
	Domain   string
}

type PacketCredentials struct {
	APIKey    string
	ProjectID string
}

type KubevirtCredentials struct {
	KubeConfig string
}

type VSphereCredentials struct {
	Username string
	Password string
}

type AlibabaCredentials struct {
	AccessKeyID     string
	AccessKeySecret string
}

type AnexiaCredentials struct {
	Token string
}

KKP also injects Sprig functions and the following custom functions into templates:

When referencing a Docker registry, it’s recommended to use the Registry(string) string helper function, which takes the registry override functionality for the KKP API into account.

{{ Registry "quay.io" }}/some-org/some-app:v1.0

The above will return quay.io when no override is set, otherwise the overridden registry.

Configure KKP

It’s now time to configure KKP to use your Docker image instead of its default, and to tell it about your new addon. By default, the KKP Operator will use the KKP version for the Docker image tag (so if you configure docker.io/example/my-addons as the repository, the final image name will be docker.io/example/my-addons:KKP_VERSION). To help with developing custom addons, it is however possible to define an additional suffix for the image tag, which will be appended to the KKP version with a dash (i.e. docker.io/example/my-addons:KKP_VERSION-YOUR_SUFFIX).

This versioning scheme ensures that admins can easily roll out new Docker images for their addons, but also that updating the Docker image is not accidentally forgotten when updating KKP itself.

Edit the KubermaticConfiguration and update the Docker repository for example for Kubernetes:

spec:
  userCluster:
    addons:
      kubernetes:
        # Do not specify a tag here, as the KKP Operator will always use the KKP
        # version instead.
        dockerRepository: docker.io/customer/addons

        # Leave this empty if you have not created your own Docker images, otherwise this
        # can be used to force pulling a new image whenever KKP is updated.
        # With this exact configuration (assuming KKP v2.15.1 is used), the final image name
        # will be "docker.io/customer/addons:v2.15.1-1".
        dockerTagSuffix: '1'

You also need to add your new addon to the defaultManifests:

spec:
  userCluster:
    addons:
      kubernetes:
        defaultManifests: |-
          apiVersion: v1
          kind: List
          items:

          # add your new addon here
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: my-custom-addon

          # remember to keep the original default addons, or else user clusters will
          # be defunct
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: canal
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: csi
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: dns
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: kube-proxy
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: openvpn
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: rbac
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: kubelet-configmap
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: default-storage-class
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: nodelocal-dns-cache
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: pod-security-policy
          - apiVersion: kubermatic.k8s.io/v1
            kind: Addon
            metadata:
              name: logrotate

If you want to define the addon as accessible (i.e. configurable), add it to the spec.api.accessibleAddons list.

After updating the KubermaticConfiguration, the changes will take effect after a few moments.