Add support for storing backups in Azure via Helm

This adds support both for a quickstart for storing backups in
Azure Blob Storage via the Helm chart, as well as multi-repo
support.

Author: Jonathan S. Katz

Diff for: helm/postgres/templates/_azure.tpl

@@ -0,0 +1,12 @@
+{{/* Allow for Azure secret information to be stored in a Secret */}}
+{{- define "postgres.azure" }}
+[global]
+{{- if .azure }}
+  {{- if .azure.account }}
+repo{{ add .index 1 }}-azure-account={{ .azure.account }}
+  {{- end }}
+  {{- if .azure.key }}
+repo{{ add .index 1 }}-azure-key={{ .azure.key }}
+  {{- end }}
+{{- end }}
+{{ end }}

Diff for: helm/postgres/templates/pgbackrest-secret.yaml

@@ -1,4 +1,4 @@
-{{- if or .Values.multiBackupRepos .Values.s3 .Values.gcs }}
+{{- if or .Values.multiBackupRepos .Values.s3 .Values.gcs .Values.azure }}
 apiVersion: v1
 kind: Secret
 metadata:
@@ -17,6 +17,10 @@ data:
         {{ include "postgres.gcs" $args | b64enc }}
   gcs-key.json: |-
         {{ $repo.gcs.key | b64enc }}
+  {{- else if $repo.azure }}
+  {{- $args := dict "azure" $repo.azure "index" $index }}
+  azure.conf: |-
+        {{ include "postgres.azure" $args | b64enc }}
   {{- end }}
 {{- end }}
 {{- else if .Values.s3 }}
@@ -29,5 +33,9 @@ data:
         {{ include "postgres.gcs" $args | b64enc }}
   gcs-key.json: |-
         {{ .Values.gcs.key | b64enc }}
+{{- else if .Values.azure }}
+  {{- $args := dict "azure" .Values.azure "index" 0 }}
+  azure.conf: |-
+        {{ include "postgres.azure" $args | b64enc }}
 {{- end }}
 {{- end }}

Diff for: helm/postgres/templates/postgres.yaml

@@ -46,7 +46,7 @@ spec:
           name: {{ default .Release.Name .Values.name }}-pgbackrest-secret
       global:
         {{- range $index, $repo := .Values.multiBackupRepos }}
-        {{- if or $repo.s3 $repo.gcs }}
+        {{- if or $repo.s3 $repo.gcs $repo.azure }}
         repo{{ add $index 1 }}-path: /pgbackrest/{{ $.Release.Namespace }}/{{ default $.Release.Name $.Values.name }}/repo{{ add $index 1 }}
         {{- end }}
         {{- end }}
@@ -69,6 +69,9 @@ spec:
         {{- else if $repo.gcs }}
         gcs:
           bucket: {{ $repo.gcs.bucket | quote }}
+        {{- else if $repo.azure }}
+        azure:
+          container: {{ $repo.azure.container | quote }}
         {{- end }}
       {{- end }}
 {{- else if .Values.s3 }}
@@ -96,6 +99,16 @@ spec:
       - name: repo1
         gcs:
           bucket: {{ .Values.gcs.bucket | quote }}
+{{- else if .Values.azure }}
+      configuration:
+      - secret:
+          name: {{ default .Release.Name .Values.name }}-pgbackrest-secret
+      global:
+        repo1-path: /pgbackrest/{{ .Release.Namespace }}/{{ default .Release.Name .Values.name }}/repo1
+      repos:
+      - name: repo1
+        azure:
+          container: {{ .Values.azure.container | quote }}
 {{- else }}
       repos:
       - name: repo1

Diff for: helm/postgres/values.yaml

@@ -200,6 +200,17 @@
 #   key: |
 #     {}
 
+# azure allows for Azure Blob Storage to be used for backups. This allows
+# for a quick setup with Azure Blob Storage; if you need a more advanced setup,
+# use "pgBackRestConfig".
+# azure:
+#   # account is the name of the Azure account to be used.
+#   account: ""
+#   # key is the Secret key used associated with the Azure acount.
+#   key: ""
+#   # container is the Azure container that the backups will be stored in.
+#   container: ""
+
 # multiBackupRepos allows for backing up to multiple repositories. This is
 # effectively uses the "quickstarts" for each of the backup types (volume, s3,
 # gcs, azure). You can have any permutation of these types. You can set up to 4.
@@ -224,6 +235,10 @@
 #     bucket: ""
 #     key: |
 #       {}
+# - azure:
+#     account: ""
+#     key: ""
+#     container: ""
 
 # pgBackRestConfig allows for the configuration of every pgBackRest option
 # except for "image", which is set by "pgBackRest".