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5. Install Kubernetes Modules

Setup Kubernetes Modules​

On this page, we will explain how to install the modules that will be used on the cluster from the client nodes.
All the processes introduced here will be done on the client nodes.

Helm​

Helm is one of the package management tools that helps to deploy and manage resources related to Kubernetes packages at once.

  1. Download Helm version 3.7.1 into the current folder.

  • For Linux amd64

    wget https://get.helm.sh/helm-v3.7.1-linux-amd64.tar.gz

  • Other OS refer to the official website for the download path of the binary that matches the OS and CPU of your client node.

  1. Unzip the file to use helm and move the file to its desired location.

    tar -zxvf helm-v3.7.1-linux-amd64.tar.gz
    sudo mv linux-amd64/helm /usr/local/bin/helm

  2. Check to see if the installation was successful:

    helm help

    If you see the following message, it means that it has been installed normally. 

    The Kubernetes package manager

    Common actions for Helm:

  • helm search: search for charts

  • helm pull: download a chart to your local directory to view

  • helm install: upload the chart to Kubernetes

  • helm list: list releases of charts

    Environment variables:

    NameDescription
    $HELM_CACHE_HOMEset an alternative location for storing cached files.
    $HELM_CONFIG_HOMEset an alternative location for storing Helm configuration.
    $HELM_DATA_HOMEset an alternative location for storing Helm data.

    ...


Kustomize​

Kustomize is one of the package management tools that helps to deploy and manage multiple Kubernetes resources at once.

  1. Download the binary version of kustomize v3.10.0 in the current folder.

  • For Linux amd64

    wget https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv3.10.0/kustomize_v3.10.0_linux_amd64.tar.gz

  • Other OS can be downloaded from kustomize/v3.10.0 after checking.

  1. Unzip to use kustomize, and change the file location. 

    tar -zxvf kustomize_v3.10.0_linux_amd64.tar.gz
    sudo mv kustomize /usr/local/bin/kustomize

  2. Check if it is installed correctly.

    kustomize help

    If you see the following message, it means that it has been installed normally.

    Manages declarative configuration of Kubernetes.
    See https://sigs.k8s.io/kustomize

    Usage:
      kustomize [command]

    Available Commands:
      build                     Print configuration per contents of kustomization.yaml
      cfg                       Commands for reading and writing configuration.
      completion                Generate shell completion script
      create                    Create a new kustomization in the current directory
      edit                      Edits a kustomization file
      fn                        Commands for running functions against configuration.
    ...

CSI Plugin : Local Path Provisioner​

  1. The CSI Plugin is a module that is responsible for storage within Kubernetes. Install the CSI Plugin, Local Path Provisioner, which is easy to use in single node clusters.

    kubectl apply -f https://raw.githubusercontent.com/rancher/local-path-provisioner/v0.0.20/deploy/local-path-storage.yaml

    If you see the following messages, it means that the installation was successful: 

    namespace/local-path-storage created
    serviceaccount/local-path-provisioner-service-account created
    clusterrole.rbac.authorization.k8s.io/local-path-provisioner-role created
    clusterrolebinding.rbac.authorization.k8s.io/local-path-provisioner-bind created
    deployment.apps/local-path-provisioner created
    storageclass.storage.k8s.io/local-path created
    configmap/local-path-config created

  2. Also, check if the provisioner pod in the local-path-storage namespace is Running by executing the following command:

    kubectl -n local-path-storage get pod

If successful, it will display the following output:

NAME                                     READY     STATUS    RESTARTS   AGE
local-path-provisioner-d744ccf98-xfcbk   1/1       Running   0          7m

  1. Execute the following command to change the default storage class:

    kubectl patch storageclass local-path -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

    If the command is successful, the following output will be displayed:

    storageclass.storage.k8s.io/local-path patched

  2. Verify that the default storage class has been set:

    kubectl get sc

    Check if there is a storage class with the name local-path (default) in the NAME column:

    NAME                   PROVISIONER             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
    local-path (default)   rancher.io/local-path   Delete          WaitForFirstConsumer   false                  2h