An Openshift Template is, as its name, a template on creating an application deployment. We can define url, imagestream location, service, and other things. We’ll start on a very simple json template which will took a specific image from docker hub, and deploy it to Openshift and generating URL on the fly automatically.

{
  "kind": "Template",
  "apiVersion": "v1",
  "metadata": {
    "name": "create-quarkus-template",
    "annotations": {
      "description": "This example shows how to create a simple template in openshift 3.11",
      "tags": "Quarkus"
    }
  },
  "objects": [
    {
      "kind": "Service",
      "apiVersion": "v1",
      "metadata": {
        "name": "my-quarkus"
      },
      "spec": {
        "ports": [
          {
            "name": "web",
            "protocol": "TCP",
            "port": 8080,
            "targetPort": 8080,
            "nodePort": 0
          }
        ],
        "selector": {
          "name": "my-quarkus"
        },
        "type": "ClusterIP",
        "sessionAffinity": "None"
      },
      "status": {
        "loadBalancer": {}
      }
    },
    {
        "kind": "Route",
        "apiVersion": "v1",
        "metadata": {
          "name": "my-quarkus"
        },
        "spec": {
          "to": {
            "kind": "Service",
            "name": "my-quarkus"
          },
          "tls": {
            "termination": "edge"
          }
        }
    },
    {
      "kind": "ImageStream",
      "apiVersion": "v1",
      "metadata": {
        "name": "my-quarkus"
      },
      "spec": {
        "dockerImageRepository": "edwinkun/my-quarkus"
      },
      "status": {
        "dockerImageRepository": ""
      }
    },
    {
        "kind": "DeploymentConfig",
        "apiVersion": "v1",
        "metadata": {
          "name": "my-quarkus",
          "annotations": {
            "template.alpha.openshift.io/wait-for-ready": "true"
          }
        },
        "spec": {
          "strategy": {
            "type": "Rolling",
            "rollingParams": {
              "updatePeriodSeconds": 1,
              "intervalSeconds": 1,
              "timeoutSeconds": 120,
              "pre": {
                "failurePolicy": "Abort",
                "execNewPod": {
                  "command": [
                    "/bin/true"
                  ],
                  "env": [
                  ],
                  "containerName": "my-quarkus"
                }
              },
              "post": {
                "failurePolicy": "Ignore",
                "execNewPod": {
                  "command": [
                    "/bin/true"
                  ],
                  "env": [
                  ],
                  "containerName": "my-quarkus"
                }
              }
            },
            "resources": {}
          },
          "triggers": [
            {
              "type": "ImageChange",
              "imageChangeParams": {
                "automatic": true,
                "containerNames": [
                  "my-quarkus"
                ],
                "from": {
                  "kind": "ImageStreamTag",
                  "name": "my-quarkus:latest"
                }
              }
            },
            {
              "type": "ConfigChange"
            }
          ],
          "replicas": 3,
          "selector": {
            "name": "my-quarkus"
          },
          "template": {
            "metadata": {
              "labels": {
                "name": "my-quarkus"
              }
            },
            "spec": {
              "containers": [
                {
                  "name": "my-quarkus",
                  "image": "my-quarkus",
                  "ports": [
                    {
                      "containerPort": 8080,
                      "protocol": "TCP"
                    }
                  ],
                  "env": [
                  ],
                  "resources": {},
                  "terminationMessagePath": "/dev/termination-log",
                  "imagePullPolicy": "IfNotPresent",
                  "securityContext": {
                    "capabilities": {},
                    "privileged": false
                  }
                }
              ],
              "restartPolicy": "Always",
              "dnsPolicy": "ClusterFirst"
            }
          }
        },
        "status": {}
      }
  ],
  "labels": {
    "template": "my-quarkus-dockerbuild"
  }
}