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Install Kommander in a Small Environment

You can install the Kommander component of DKP on a small, single-cluster environment with smaller memory, storage, and CPU requirements for testing and demo purposes. This topic describes methods for installing Kommander in these environments.

Enterprise considerations: D2iQ recommends performing testing and demo tasks in a single-cluster environment. The Enterprise license is designed for multi-cluster environments and fleet management, which require a minimum number of resources. Applying an Enterprise license key to the previous installation adds modifications to your environment that can exhaust a small environment’s resources.

Prerequisites

Ensure you have done the following:

Minimal Kommander installation

The YAML file that is used to install a minimal configuration of Kommander contains the bare minimum setup that allows you to deploy applications, and access the DKP UI. It does NOT include applications for cost monitoring, logging, alerting, object storage, etc.

In this YAML file you can find the lines that correspond to all platform applications which would be included in a normal Kommander setup. Applications that have enabled set to false are not taken into account during installation. If you want to test an additional application, you can enable it individually to be installed by setting enabled to true on the corresponding line in the YAML file.

For example, if you want to enable the logging stack, set enabled to true for grafana-logging, grafana-loki logging-operator, rook-ceph and rook-ceph-cluster. Note that depending on the size of your cluster, enabling several platform applications could exhaust your cluster’s resources.

Some applications depend on other applications to work properly. Refer to the dependencies documentation to find out which other applications you need to enable to test the target application.

  1. Initialize your Kommander installation and name it kommander_minimal.yaml:

    CODE
    dkp install kommander --init --kubeconfig=${CLUSTER_NAME}.conf -oyaml > kommander_minimal.yaml
  2. Edit your kommander_minimal.yaml file to match the following example:

    CODE
    apiVersion: config.kommander.mesosphere.io/v1alpha1
    kind: Installation
    apps:
      dex:
        enabled: true
      dex-k8s-authenticator:
        enabled: true
      dkp-insights-management:
        enabled: false
      gatekeeper:
        enabled: true
      gitea:
        enabled: true
      grafana-logging:
        enabled: false
      grafana-loki:
        enabled: false
      kommander:
        enabled: true
      kommander-ui:
        enabled: true
      kube-prometheus-stack:
        enabled: false
      kubernetes-dashboard:
        enabled: false
      kubefed:
        enabled: true
      kubetunnel:
        enabled: false
      logging-operator:
        enabled: false
      prometheus-adapter:
        enabled: false
      reloader:
        enabled: true
      rook-ceph:
        enabled: false
      rook-ceph-cluster:
        enabled: false
      traefik:
        enabled: true
      traefik-forward-auth-mgmt:
        enabled: true
      velero:
        enabled: false
    ageEncryptionSecretName: sops-age
    clusterHostname: ""
  3. Install Kommander on your cluster with the following command:

    CODE
    dkp install kommander --installer-config ./kommander_minimal.yaml --kubeconfig=${CLUSTER_NAME}.conf

    In the previous command, the --kubeconfig=${CLUSTER_NAME}.conf flag ensures that you set the context to install Kommander on the right cluster. For alternatives and recommendations around setting your context, refer to Provide Context for Commands with a kubeconfig File.

    TIP: Sometimes, applications require a longer period of time to deploy, which causes the installation to time out. Add the --wait-timeout <time to wait> flag and specify a period of time (for example, 1h) to allocate more time to the deployment of applications.

If the Kommander installation fails, or you wish to reconfigure applications, you can rerun the install command, and you can view the progress by increasing the log verbosity by adding the flag -v 2.

Next Step:

Verify Kommander Installation

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