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-rw-r--r--kubernetes/dcaegen2-services/common/dcaegen2-services-common/templates/_deployment.tpl79
1 files changed, 79 insertions, 0 deletions
diff --git a/kubernetes/dcaegen2-services/common/dcaegen2-services-common/templates/_deployment.tpl b/kubernetes/dcaegen2-services/common/dcaegen2-services-common/templates/_deployment.tpl
index 10a63ebbcf..5de526288e 100644
--- a/kubernetes/dcaegen2-services/common/dcaegen2-services-common/templates/_deployment.tpl
+++ b/kubernetes/dcaegen2-services/common/dcaegen2-services-common/templates/_deployment.tpl
@@ -69,6 +69,83 @@ the the literal string "An example value".
{{- end }}
{{- end -}}
{{/*
+For internal use only!
+
+dcaegen2-services-common._externalVolumes:
+This template generates a list of volumes associated with the pod,
+based on information provided in .Values.externalVolumes. This
+template works in conjunction with dcaegen2-services-common._externalVolumeMounts
+to give the microservice access to data in volumes created else.
+This initial implementation supports ConfigMaps only, as this is the only
+external volume mounting required by current microservices.
+
+.Values.externalValues is a list of objects. Each object has 3 required fields and 1 optional field:
+ - name: the name of the resource (in the current implementation, it must be a ConfigMap)
+ that is to be set up as a volume. The value is a case sensitive string. Because the
+ names of resources are sometimes set at deployment time (for instance, to prefix the Helm
+ release to the name), the string can be a Helm template fragment that will be expanded at
+ deployment time.
+ - type: the type of the resource (in the current implementation, only "ConfigMap" is supported).
+ The value is a case-INsensitive string.
+ - mountPoint: the path to the mount point for the volume in the container file system. The
+ value is a case-sensitive string.
+ - readOnly: (Optional) Boolean flag. Set to true to mount the volume as read-only.
+ Defaults to false.
+
+Here is an example fragment from a values.yaml file for a microservice:
+
+externalVolumes:
+ - name: my-example-configmap
+ type: configmap
+ mountPath: /opt/app/config
+ - name: '{{ include "common.release" . }}-another-example'
+ type: configmap
+ mountPath: /opt/app/otherconfig
+*/}}
+{{- define "dcaegen2-services-common._externalVolumes" -}}
+ {{- $global := . -}}
+ {{- if .Values.externalVolumes }}
+ {{- range $vol := .Values.externalVolumes }}
+ {{- if eq (lower $vol.type) "configmap" }}
+ {{- $vname := (tpl $vol.name $global) }}
+- configMap:
+ defaultMode: 420
+ name: {{ $vname }}
+ name: {{ $vname }}
+ {{- end }}
+ {{- end }}
+ {{- end }}
+{{- end }}
+{{/*
+For internal use only!
+
+dcaegen2-services-common._externalVolumeMounts:
+This template generates a list of volume mounts for the microservice container,
+based on information provided in .Values.externalVolumes. This
+template works in conjunction with dcaegen2-services-common._externalVolumes
+to give the microservice access to data in volumes created else.
+This initial implementation supports ConfigMaps only, as this is the only
+external volume mounting required by current microservices.
+
+See the documentation for dcaegen2-services-common._externalVolumes for
+details on how external volumes are specified in the values.yaml file for
+the microservice.
+*/}}
+{{- define "dcaegen2-services-common._externalVolumeMounts" -}}
+ {{- $global := . -}}
+ {{- if .Values.externalVolumes }}
+ {{- range $vol := .Values.externalVolumes }}
+ {{- if eq (lower $vol.type) "configmap" }}
+ {{- $vname := (tpl $vol.name $global) -}}
+ {{- $readOnly := $vol.readOnly | default false }}
+- mountPath: {{ $vol.mountPath }}
+ name: {{ $vname }}
+ readOnly: {{ $readOnly }}
+ {{- end }}
+ {{- end }}
+ {{- end }}
+{{- end }}
+{{/*
dcaegen2-services-common.microserviceDeployment:
This template produces a Kubernetes Deployment for a DCAE microservice.
@@ -255,6 +332,7 @@ spec:
- name: policy-shared
mountPath: /etc/policies
{{- end }}
+ {{- include "dcaegen2-services-common._externalVolumeMounts" . | nindent 8 }}
{{- if $logDir }}
- image: {{ include "repositoryGenerator.image.logging" . }}
imagePullPolicy: {{ .Values.global.pullPolicy | default .Values.pullPolicy }}
@@ -352,6 +430,7 @@ spec:
- name: policy-shared
emptyDir: {}
{{- end }}
+ {{- include "dcaegen2-services-common._externalVolumes" . | nindent 6 }}
imagePullSecrets:
- name: "{{ include "common.namespace" . }}-docker-registry-key"
{{ end -}}