Templates and Catalog

• This catalog item is a combination of various objects we built throughout this course.
• It has a build configuration, an image stream, a deployment configuration.

• Database credential can be stored securely in a Secret object

• The template also has a definition for user parameters seen in the Wizard such as application name, Namespace, Git repository, etc.
• All of these various components are packaged into a single template that can be deployed at once for user to deploy full application stack.
• You can create your own such template too.

• Template can be created using a YAML file using kind Template.
• Under objects section, create an array of the different objects part of the application stack such as secret, service, build config, deployment config, route, image stream
• Finally, a section for defining the parameters that user will enter in the wizard.

apiVersion: v1
kind: Template
metadata:
  name: custom-app
objects:
- apiVersion: v1
  kind: Secret
  # ...
- apiVersion: v1
  kind: Service
  # ...
- apiVersion: v1
  kind: Service
  # ...
- apiVersion: v1
  kind: Route
  # ...
- apiVersion: v1
  kind: BuildConfig
  # ...
- apiVersion: v1
  kind: DeploymentConfig
  # ...
- apiVersion: v1
  kind: DeploymentConfig
  # ...
- apiVersion: v1
  kind: ImageStream
  # ...
parameters:
  - deplayName: "Namespace"
    name: "NAMESPACE"

• Template can be created by oc create -f template-config.yml
• If you are not sure about the YAML config, try to copying from the existing one e.g. oc export service db

Workshop

• Create template YAML file >>>See YAML file here<<<

• Create application from template by Add to Project --> Select from Project.