Install Kubectl and Helm Clients Directly on a HostΒΆ
You can use kubectl and helm to interact with a controller from a remote system.
About this task
Commands such as those that reference local files or commands that require a shell are more easily used from clients running directly on a remote workstation.
Complete the following steps to install kubectl and helm on a remote system.
The following procedure shows how to configure the kubectl and helm clients directly on remote host, for an admin user with cluster-admin cluster role. If using a non-admin user such as one with only role privileges within a private namespace, the procedure is the same, however, additional configuration is required in order to use helm.
Prerequisites
You must configure the oidc-auth-apps OIDC Identity Provider (dex) on the target StarlingX environment to get Kubernetes authentication tokens. See Set up OIDC Auth Applications for more information.
Procedure
On the controller, create a rolebinding for the admin-user user. Alternatively, to use group rolebinding and user group membership for authorization, see Configure Users, Groups, and Authorization for more information.
% MYUSER="admin-user" % cat <<EOF > admin-user-rolebinding.yaml kind: ClusterRoleBinding apiVersion: rbac.authorization.k8s.io/v1 metadata: name: ${MYUSER}-rolebinding roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-admin subjects: - apiGroup: rbac.authorization.k8s.io kind: User name: ${MYUSER} EOF % kubectl apply -f admin-user-rolebinding.yaml
On the remote workstation, install the kubectl client, set up the Kubernetes configuration and get a token. Follow the steps of section Kubernetes Remote Client Access using the Host Directly at Configure Kubernetes Client Access, then test the kubectl access with the command below.
% kubectl get nodes -o wide NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE ... controller-0 Ready master 15h v1.12.3 192.168.204.3 <none> CentOS L ... controller-1 Ready master 129m v1.12.3 192.168.204.4 <none> CentOS L ... worker-0 Ready <none> 99m v1.12.3 192.168.204.201 <none> CentOS L ... worker-1 Ready <none> 99m v1.12.3 192.168.204.202 <none> CentOS L ... %
On the workstation, install the helm client on an Ubuntu host by taking the following actions on the remote Ubuntu system.
Install helm. See the following reference: https://helm.sh/docs/intro/install/. Helm accesses the Kubernetes cluster as configured in the previous step, using the default ~/.kube/config.
% wget https://get.helm.sh/helm-v3.2.1-linux-amd64.tar.gz % tar xvf helm-v3.2.1-linux-amd64.tar.gz % sudo cp linux-amd64/helm /usr/local/bin
Verify that helm installed correctly.
% helm version version.BuildInfo{Version:"v3.2.1", GitCommit:"fe51cd1e31e6a202cba7dead9552a6d418ded79a", GitTreeState:"clean", GoVersion:"go1.13.10"}
Run the following commands:
% helm repo add bitnami https://charts.bitnami.com/bitnami % helm repo update % helm repo list % helm search repo % helm install wordpress bitnami/wordpress