feat: allow extra ports to be added to the backend service (#237)

This is useful when prometheus metrics are exposed on a different port.
This resolves #236.

Signed-off-by: RedlineTriad <39059512+RedlineTriad@users.noreply.github.com>

Author: RedlineTriad

charts/backstage/Chart.yaml

@@ -38,4 +38,4 @@ sources:
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 2.2.0
+version: 2.3.0

charts/backstage/README.md

@@ -2,7 +2,7 @@
 # Backstage Helm Chart
 
 [![Artifact Hub](https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/backstage)](https://artifacthub.io/packages/search?repo=backstage)
-![Version: 2.2.0](https://img.shields.io/badge/Version-2.2.0-informational?style=flat-square)
+![Version: 2.3.0](https://img.shields.io/badge/Version-2.3.0-informational?style=flat-square)
 ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
 
 A Helm chart for deploying a Backstage application
@@ -125,6 +125,7 @@ Kubernetes: `>= 1.19.0-0`
 | backstage.extraEnvVars | Backstage container environment variables | list | `[]` |
 | backstage.extraEnvVarsCM | Backstage container environment variables from existing ConfigMaps | list | `[]` |
 | backstage.extraEnvVarsSecrets | Backstage container environment variables from existing Secrets | list | `[]` |
+| backstage.extraPorts | Backstage container additional ports | list | `[]` |
 | backstage.extraVolumeMounts | Backstage container additional volume mounts | list | `[]` |
 | backstage.extraVolumes | Backstage container additional volumes | list | `[]` |
 | backstage.hostAliases | Host Aliases for the pod <br /> Ref: https://kubernetes.io/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases/ | list | `[]` |

charts/backstage/templates/backstage-deployment.yaml

@@ -162,6 +162,9 @@ spec:
             - name: backend
               containerPort: {{ .Values.backstage.containerPorts.backend }}
               protocol: TCP
+            {{- if .Values.backstage.extraPorts }}
+            {{- include "common.tplvalues.render" ( dict "value" .Values.backstage.extraPorts "context" $) | nindent 12 }}
+            {{- end }}
           {{- if (or .Values.backstage.extraAppConfig .Values.backstage.appConfig (and .Values.backstage.extraVolumeMounts .Values.backstage.extraVolumes)) }}
           volumeMounts:
             {{- range .Values.backstage.extraAppConfig }}

charts/backstage/values.schema.json

@@ -2389,6 +2389,42 @@
                     "title": "Backstage container environment variables from existing Secrets",
                     "type": "array"
                 },
+                "extraPorts": {
+                    "default": [],
+                    "items": {
+                        "description": "ContainerPort represents a network port in a single container.",
+                        "properties": {
+                            "containerPort": {
+                                "description": "Number of port to expose on the pod's IP address. This must be a valid port number, 0 < x < 65536.",
+                                "format": "int32",
+                                "type": "integer"
+                            },
+                            "hostIP": {
+                                "description": "What host IP to bind the external port to.",
+                                "type": "string"
+                            },
+                            "hostPort": {
+                                "description": "Number of port to expose on the host. If specified, this must be a valid port number, 0 < x < 65536. If HostNetwork is specified, this must match ContainerPort. Most containers do not need this.",
+                                "format": "int32",
+                                "type": "integer"
+                            },
+                            "name": {
+                                "description": "If specified, this must be an IANA_SVC_NAME and unique within the pod. Each named port in a pod must have a unique name. Name for the port that can be referred to by services.",
+                                "type": "string"
+                            },
+                            "protocol": {
+                                "description": "Protocol for port. Must be UDP, TCP, or SCTP. Defaults to \"TCP\".",
+                                "type": "string"
+                            }
+                        },
+                        "required": [
+                            "containerPort"
+                        ],
+                        "type": "object"
+                    },
+                    "title": "Extra ports to expose in the Backstage container",
+                    "type": "array"
+                },
                 "extraVolumeMounts": {
                     "default": [],
                     "items": {

charts/backstage/values.schema.tmpl.json

@@ -404,6 +404,14 @@
                         ]
                     ]
                 },
+                "extraPorts": {
+                    "title": "Extra ports to expose in the Backstage container",
+                    "type": "array",
+                    "items": {
+                        "$ref": "https://raw.githubusercontent.com/yannh/kubernetes-json-schema/master/master/_definitions.json#/definitions/io.k8s.api.core.v1.ContainerPort"
+                    },
+                    "default": []
+                },
                 "extraVolumeMounts": {
                     "title": "Backstage container additional volume mounts",
                     "type": "array",
@@ -457,10 +465,10 @@
                     "$ref": "https://raw.githubusercontent.com/yannh/kubernetes-json-schema/master/master/_definitions.json#/definitions/io.k8s.api.core.v1.Probe",
                     "default": {
                         "httpGet": {
-                                "path": "/.backstage/health/v1/readiness",
-                                "port": 7007,
-                                "scheme": "HTTP"
-                            }
+                            "path": "/.backstage/health/v1/readiness",
+                            "port": 7007,
+                            "scheme": "HTTP"
+                        }
                     },
                     "examples": [
                         {
@@ -879,13 +887,17 @@
                             "description": "The port where the metrics are exposed. If using OpenTelemetry as [documented here](https://backstage.io/docs/tutorials/setup-opentelemetry/), then the port needs to be explicitely specificed. OpenTelemetry's default port is 9464.",
                             "title": "ServiceMonitor endpoint port",
                             "anyOf": [
-                                { "type": "string" },
-                                { "type": "integer" }
+                                {
+                                    "type": "string"
+                                },
+                                {
+                                    "type": "integer"
+                                }
                             ]
                         }
                     }
                 }
             }
         }
     }
-}
+}

charts/backstage/values.yaml

@@ -158,6 +158,9 @@ backstage:
   # -- Backstage container environment variables from existing Secrets
   extraEnvVarsSecrets: []
 
+  # -- Backstage container additional ports
+  extraPorts: []
+
   # -- Backstage container additional volume mounts
   extraVolumeMounts: []