feat: wait for DB to be up before running migration

Signed-off-by: Harry Bagdi <harrybagdi@gmail.com>

stable/kong/Chart.yaml

@@ -10,5 +10,5 @@ maintainers:
 name: kong
 sources:
 - https://github.com/Kong/kong
-version: 0.4.0
+version: 0.4.1
 appVersion: 0.14.0

stable/kong/templates/deployment.yaml

@@ -23,6 +23,24 @@ spec:
         app: {{ template "kong.name" . }}
         release: {{ .Release.Name }}
     spec:
+      initContainers:
+      - name: wait-for-db
+        image: busybox
+        env:
+        {{- if .Values.postgresql.enabled }}
+        - name: KONG_PG_HOST
+          value: {{ template "kong.postgresql.fullname" . }}
+        - name: KONG_PG_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: {{ template "kong.postgresql.fullname" . }}
+              key: postgres-password
+        {{- end }}
+        {{- if .Values.cassandra.enabled }}
+        - name: KONG_CASSANDRA_CONTACT_POINTS
+          value: {{ template "kong.cassandra.fullname" . }}
+        {{- end }}
+        command: [ "/bin/sh", "-c", "until kong start; do echo 'waiting for db'; sleep 1; done; kong stop" ]
       containers:
       - name: {{ template "kong.name" . }}
         image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"

stable/kong/templates/migrations.yaml

@@ -13,9 +13,23 @@ spec:
     metadata:
       name: {{ template "kong.name" . }}-migrations
       labels:
-        app: "{{ template "kong.name" . }}"
+        app: {{ template "kong.name" . }}
         release: "{{ .Release.Name }}"
     spec:
+      {{- if .Values.postgresql.enabled }}
+      initContainers:
+      - name: wait-for-postgres
+        image: busybox
+        env:
+        - name: KONG_PG_HOST
+          value: {{ template "kong.postgresql.fullname" . }}
+        - name: KONG_PG_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: {{ template "kong.postgresql.fullname" . }}
+              key: postgres-password
+        command: [ "/bin/sh", "-c", "until nc -zv $KONG_PG_HOST $KONG_PG_PORT -w1; do echo 'waiting for db'; sleep 1; done" ]
+      {{- end }}
       containers:
       - name: {{ template "kong.name" . }}-migrations
         image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"