[K8S] Add DB Migration as initContainer (#129)

Co-authored-by: Till <31419678+tifrel@users.noreply.github.com>

Author: bh2smith

docker-compose.yaml

@@ -21,7 +21,9 @@ services:
     depends_on:
       - postgres-db
     environment:
-      DATABASE_URL: postgresql://postgres:postgres@postgres-db:5432/store
+      STORE_URL: postgresql://postgres:postgres@postgres-db:5432/store
+      DB_HOST_PORT: postgres-db:5432
+      NETWORK: public
 
 volumes:
   postgres-data:

docker/Dockerfile.migration

@@ -17,5 +17,8 @@ COPY data-store/migrations/ /app/data-store/migrations/
 COPY test_db/wait-for-it.sh /app
 RUN chmod +x /app/wait-for-it.sh
 
-# Run the migrations
-CMD ["./wait-for-it.sh", "postgres-db:5432", "--", "diesel", "migration", "run"]
+COPY docker/entrypoint.migration.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Set the script as the entrypoint of the container
+ENTRYPOINT ["/entrypoint.sh"]

docker/entrypoint.migration.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Construct DATABASE_URL from STORE_URL and NETWORK
+export DATABASE_URL="${STORE_URL}?options=-c search_path%3D${NETWORK}"
+
+# Run the wait-for-it script, then execute diesel migration
+./wait-for-it.sh $DB_HOST_PORT -- diesel migration run

kubernetes/config/pod.yaml

@@ -13,6 +13,18 @@ spec:
       labels:
         app: {{ .ProjectName }}
     spec:
+      initContainers:
+        - name: migration
+          image: {{ .ContainerRepo }}/{{ .ProjectName }}-migration:{{ .ImageTag }}
+          env:
+            - name: STORE_URL
+              valueFrom:
+                secretKeyRef:
+                  name: indexer-secrets
+                  key: STORE_URL
+            - name: NETWORK
+              value: { { .Network } }
+
       containers:
       - name: {{ .ProjectName }}
         image: {{ .ContainerRepo }}/{{ .ProjectName }}:{{ .ImageTag }}