Application Deployment to GKE Cluster Using Helm Plugin

Objective

The goal of this tutorial is to deploy an Apache HTTP Server using Helm Chart on a Google Kubernetes Engine (GKE) cluster through FlexDeploy using the Helm Plugin. For this tutorial, we will be setting up an automated deployment of an Apache HTTP Server using the Helm Chart which is present in this chart repository (https://charts.bitnami.com/bitnami) . The steps will include:

• Configuring properties e.g. config file path, cloud account, and CLI path

• Deploying the Apache HTTP Server to a GKE cluster

• Verifying the application is successfully created on the GKE cluster

We will walk through each of the FlexDeploy features that will be created/configured to accomplish this goal and have the Apache HTTP Server deployed on the GKE cluster in a very short amount of time.

Checklist

Configure Cloud Account

To connect with GKE cluster, we required to configure Cloud account, with credentials details. Configure GCP Cloud Account under Integration. FlexDeploy will connect to the GKE cluster and deploy the Apache HTTP Server.

1. Navigate to the Integrations

2. Select Cloud from the left-hand pane

3. Create a new Containers account with the “+” button. Create a new Cloud account of provider type “GCP”

Open

It should have a Project Id and Key File configured in it. The user must have relevant access to do the deployment on GKE cluster.

Open

1. Key File is a password field and hence needs to be kept hidden. To update it, click on the pencil icon as shown below

2. Update the entire Key File value under Secret Text. This is to make sure no one else can retrieve the password

After configuring, we can use the cloud account.

Prerequisites

Configure Service Account

To access the GKE cluster, we need to create a service account.

Creating a service account to connect with the GKE cluster. Adding Kubernetes Engine Developer role for this tutorial. Different roles are available with different access(which can be assigned).

Next we have to create a Service Account Key file which will verify the identity of the Service Account during execution. For more information about key file: https://cloud.google.com/iam/docs/creating-managing-service-account-keys , this key file we have to configured in GCP Cloud account.

Created key file should have the following format, where PRIVATE_KEY is the private portion of the public/private key pair:

e.g of the Key File -

The entire content of the key file we have to configured in GCP Cloud account as secret text.

Configure kubeconfig File

A Kubeconfig is a YAML file with the details to connect to Kubernetes cluster using certificate/secret tokens to authenticate the cluster. This is essential for Helm Plugin to connect to target GKE cluster. 

CLI Installation

GCP CLI should be installed in the m/c where the plugin is to be executed. Preferably add GCP CLI path in m/c classpath. Please ref. https://cloud.google.com/sdk/docs/install for more information about installation.

Deploy Workflow

Navigate to Workflows and create a workflow using the button as highlighted below.

Below is a sample deploy workflow to deploy the application on a GKE cluster.

Step-i: deploy the application

This step will deploy the Apache HTTP Server on the GKE cluster, using the Helm Chart which is present at chart repository (https://charts.bitnami.com/bitnami) . Context must be provided to apply changes. The context should be present inside kubeconfig file.

In above configuration using following inputs, for all input and their description please refer to the plugin documentation: https://flexagon.atlassian.net/wiki/spaces/FD80/pages/10561727069

Project configuration

Navigate to the Project tab and create a Project with a logical name(Helm in this case)

Configure the Deploy workflow that has been created in previous steps as shown below.

Target Properties

Select Topology from the menu and then select Targets from menu. Select the target group and environment, provide the properties detail, according to the description.

Below given are the environment-specific values which need to be updated.

Cloud Account

The GCP Cloud account needs to be set here from the drop-down. It will show all Cloud Accounts configured under Topology, which we have already mentioned earlier.

Kubeconfig file path

Absolute path of config file can be set as environment property, if path is not set then by default plugin look for config file in user directory.

CLI path

GCP CLI path can be set as environment property, if it’s not set then by default plugin use classpath.

Override properties at Project level

Let assume a scenario, where we want to change Cloud account for any specific project. Apart from setting at environment level, it can also be set at project properties by using Override Property. Please check below mentioned steps.

1. Navigate to the Project Configuration tab as shown above.

2. Next, select the PROPERTIES option from the left-hand pane.

3. Click on the OVERRIDE option.

4. Select the Cloud Account option from Property.

5. Select the Environment from the drop down list.

6. Select the Target Group from the drop down list.

Build Execution

For detailed steps on how to initiate deploy operation using Helm plugin, please refer to https://flexagon.atlassian.net/wiki/spaces/FD80/pages/10561720452

Post deployment

Post deployment success from plugin it can take a little while for the deployment and running.

Once deployment successfully completed, we can see the related details on GKE cluster by using GCP console.

Congratulations! You have successfully completed the Apache HTTP Server deployment.

Now that you have configured FlexDeploy for deployment operation using Helm plugin, it is extremely easy to replicate the same for other Cloud Provider. Simply use the Copy Project feature and a new project will be created with all of the configuration completed already. You just need to make the necessary configuration changes.