Installation on Google Cloud Platform via GKE

Overview

This guide covers the installation of CAST Imaging on Google Cloud Platform Google Kubernetes Engine  (GKE) using Helm charts.

Requirements

• Access to Docker Hub registry - CAST Imaging Docker images are available as listed in the table below
• A clone of the appropriate Git repository (https://github.com/CAST-Extend/com.castsoftware.castimaging-v3.kubernetessetup ) branch (i.e. matching the version of CAST Imaging you want to deploy) containing the Helm chart scripts - for example to clone the 3.2.3-funcrel release branch use git clone -b 3.2.3 https://github.com/CAST-Extend/com.castsoftware.castimaging-v3.kubernetessetup
• A valid CAST Imaging License
• Optional setup choices:
  • Deploy the Kubernetes Dashboard (https://github.com/kubernetes/dashboard ) to troubleshoot containers and manage the cluster resources.

Docker images

CAST Imaging is provided in a set of Docker images as follows:

Installation process

Before starting the installation, ensure that your Kubernetes cluster is running, all the CAST Imaging docker images are available in the registry and that helm and kubectl are installed on your system.

Step 1 - GKE environment setup

• Create your GKE environment, see GKE - Cluster Setup. Also refer to the Google documentation 
• Retrieve the cluster credentials using GCP CLI:

gcloud container clusters get-credentials my-cluster --zone=my-zone

• Install kubectl - see https://kubernetes.io/docs/tasks/tools/ 
• Install helm:
  • Binary download: https://github.com/helm/helm/releases 
  • Documentation: https://helm.sh/docs/intro/quickstart/ 

Step 2 - GCP Network settings and CAST Imaging installation

Prerequisites:

• A domain name e.g. mydomain.com with DNS record pointing at this static IP
• An SSL certificate for mydomain.com

Steps:

• Create a global static external IP in GCP
• Store the SSL certificate for mydomain.com in GCP “Certificate Manager”
• Update console-gatewayservice-ingress.yaml with the “Managed Certificate name” and “Static IP name”:
  • Edit the file and make a global string replacement of my-certificate and my-frontend-ip with the actual names
• Review and adjust the parameter values in the values.yaml file (located at the root of the cloned Git repository branch) in between the section separated with # marks.
  • K8SProvider: GKE
  • FrontEndHost: https://mydomain.com 
  • When using a custom CA or self-signed SSL certificate, copy the contents into the relevant section in the file console-authenticationservice-configmap.yaml located at the root of the cloned Git repository branch and then set UseCustomTrustStore: option to true in the values.yaml
• Install the HelmChart: This will create the k8s Ingress as well as a Load Balancer and a Health Check within GCP
  • Run helm-install.bat|sh (depending on your base OS) located at the root of the cloned Git repository branch
• Update the Health Check in GCP:
  • Locate and edit the Health Check that was automatically created in GCP for the console-gateway-service:
    • The Health Check name will be similar to: k8s1-abc123456-castimaging-v-console-gateway-servic-809-abc123abc
  • Set the “Request path” to: /actuator/health
  • Press “Save”
• Wait until GCP network components are deployed (may take up to 20 min)
• CAST Imaging will be available on https://mydomain.com 

Step 3 - Install Extend Local Server (optional)

If you need to install Extend Local Server as an intermediary placed between CAST Imaging and CAST’s publicly available “Extend” ecosystem https://extend.castsoftware.com , follow the instructions below. This step is optional and if not completed, CAST Imaging will access https://extend.castsoftware.com  to obtain required resources.

• Retrieve the Extend Local Server external IP address by running kubectl get service -n castimaging-v3 extendproxy
• In values.yaml (located at the root of the cloned Git repository branch), set ExtendProxy.enable to true and update the ExtendProxy.exthostname variable with the external IP address:

ExtendProxy:
    enable: true
    exthostname: EXTERNAL-IP

• Run helm-upgrade.bat|sh (depending on your base OS) located at the root of the cloned Git repository branch.
• Review the log of the extendproxy pod to find the Extend Local Server administration URL and API key (these are required for managing Extend Local Server and configuring CAST Imaging to use it - you can find out more about this in Extend Local Server). You can open the log file from the Kubernetes Dashboard (if you have chosen to install it). Alternatively, you can get the extendproxy pod name by running kubectl get pods -n castimaging-v3 then run kubectl logs -n castimaging-v3 castextend-xxxxxxxx to display the log.

Step 4 - Initial start up configuration

When the install is complete, browse to the public/external URL and login using the default local admin/admin credentials. You will be prompted to configure:

• your licensing strategy. Choose either a Named Application strategy (where each application you onboard requires a dedicated license key entered when you perform the onboarding), or a Contributing Developers strategy (a global license key based on the number of users):

• CAST Extend settings / Proxy settings (if you chose to install Extend Local Server (see Step 4 above) then you now need to input the URL and API key so that CAST Imaging uses it).

As a final check, browse to the URL below and ensure that you have at least one CAST Imaging Node Service, the CAST Dashboards and the CAST Imaging Viewer components listed:

https://<public or external URL>/admin/services

Step 5 - Configure authentication

Out-of-the-box, CAST Imaging is configured to use Local Authentication via a simple username/password system. Default login credentials are provided (admin/admin) with the global ADMIN profile so that installation can be set up initially.

CAST recommends configuring CAST Imaging to use your enterprise authentication system such as LDAP or SAML Single Sign-on instead before you start to onboard applications. See Authentication for more information.

How to start and stop CAST Imaging

Use the following script files (located at the root of the cloned Git repository branch) to stop and start CAST Imaging:

• Util-ScaleDownAll.bat|sh
• Util-ScaleUpAll.bat|sh

Optional setup choices

Install Kubernetes Dashboard

Please refer to the Kubernetes Dashboard documentation at https://kubernetes.io/docs/tasks/access-application-cluster/web-ui-dashboard/ .