Cleanly separate legacy migration part

Use `kubectl patch -f ...`

README.md

@@ -98,7 +98,24 @@ $ kubectl create -f namespace-staging.yaml
 ```
 Switch to the namespace `staging` in your kubernetes dashboard.
 
-### Prepare migration of Human Connection legacy server
+
+### Run the configuration
+```shell
+$ kubectl apply -f staging/
+```
+
+This can take a while because kubernetes will download the docker images.
+Sit back and relax and have a look into your kubernetes dashboard.
+Wait until all pods turn green and they don't show a warning
+`Waiting: ContainerCreating` anymore.
+
+#### Legacy data migration
+
+This setup is completely optional and only required if you have data on a server
+which is running our legacy code and you want to import that data. It will
+import the uploads folder and migrate a dump of mongodb into neo4j.
+
+##### Prepare migration of Human Connection legacy server
 Create a configmap with the specific connection data of your legacy server:
 ```sh
 $ kubectl create configmap db-migration-worker          \
@@ -126,17 +143,16 @@ points out, you should be careful with your ssh keys. Anyone with access to your
 cluster will have access to your ssh keys. Better create a new pair with
 `ssh-keygen` and copy the public key to your legacy server with `ssh-copy-id`.
 
-### Run the configuration
-```shell
-$ kubectl apply -f staging/
+##### Migrate legacy database
+Patch the existing deployments to use a multi-container setup:
+```bash
+cd legacy-migration
+kubectl apply -f volume-claim-mongo-export.yaml
+kubectl patch --namespace=staging deployment nitro-backend --patch "$(cat deployment-backend.yaml)"
+kubectl patch --namespace=staging deployment nitro-neo4j   --patch "$(cat deployment-neo4j.yaml)"
+cd ..
 ```
 
-This can take a while because kubernetes will download the docker images.
-Sit back and relax and have a look into your kubernetes dashboard.
-Wait until all pods turn green and they don't show a warning
-`Waiting: ContainerCreating` anymore.
-
-### Migrate legacy database
 Run the migration:
 ```shell
 $ kubectl --namespace=staging get pods

legacy-migration/deployment-backend.yaml

@@ -0,0 +1,27 @@
+---
+  apiVersion: extensions/v1beta1
+  kind: Deployment
+  metadata:
+    name: nitro-backend
+    namespace: staging
+  spec:
+    template:
+      spec:
+        containers:
+        - name: nitro-db-migration-worker
+          image: humanconnection/db-migration-worker:latest
+          imagePullPolicy: Always
+          envFrom:
+          - configMapRef:
+              name: db-migration-worker
+          volumeMounts:
+          - name: secret-volume
+            readOnly: false
+            mountPath: /root/.ssh
+          - name: uploads
+            mountPath: /uploads/
+        volumes:
+        - name: secret-volume
+          secret:
+            secretName: ssh-keys
+            defaultMode: 0400

legacy-migration/deployment-neo4j.yaml

@@ -0,0 +1,39 @@
+---
+  apiVersion: extensions/v1beta1
+  kind: Deployment
+  metadata:
+    name: nitro-neo4j
+    namespace: staging
+  spec:
+    template:
+      spec:
+        containers:
+        - name: nitro-db-migration-worker
+          image: humanconnection/db-migration-worker:latest
+          imagePullPolicy: Always
+          envFrom:
+          - configMapRef:
+              name: db-migration-worker
+          env:
+          - name: COMMIT
+            value: <BACKEND_COMMIT>
+          - name: NEO4J_URI
+            value: bolt://localhost:7687
+          volumeMounts:
+          - name: secret-volume
+            readOnly: false
+            mountPath: /root/.ssh
+          - name: mongo-export
+            mountPath: /mongo-export/
+        - name: nitro-neo4j
+          volumeMounts:
+            - mountPath: /mongo-export/
+              name: mongo-export
+        volumes:
+        - name: secret-volume
+          secret:
+            secretName: ssh-keys
+            defaultMode: 0400
+        - name: mongo-export
+          persistentVolumeClaim:
+            claimName: mongo-export-claim

legacy-migration/volume-claim-mongo-export.yaml

@@ -0,0 +1,12 @@
+---
+  kind: PersistentVolumeClaim
+  apiVersion: v1
+  metadata:
+    name: mongo-export-claim
+    namespace: staging
+  spec:
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 1Gi

staging/deployment-backend.yaml

@@ -18,18 +18,6 @@
         name: "nitro-backend"
       spec:
         containers:
-        - name: nitro-db-migration-worker
-          image: humanconnection/db-migration-worker:latest
-          imagePullPolicy: Always
-          envFrom:
-          - configMapRef:
-              name: db-migration-worker
-          volumeMounts:
-          - name: secret-volume
-            readOnly: false
-            mountPath: /root/.ssh
-          - name: uploads
-            mountPath: /uploads/
         - name: nitro-backend
           image: humanconnection/nitro-backend:latest
           imagePullPolicy: Always
@@ -75,10 +63,6 @@
             - mountPath: /nitro-backend/public/uploads
               name: uploads
         volumes:
-        - name: secret-volume
-          secret:
-            secretName: ssh-keys
-            defaultMode: 0400
         - name: uploads
           persistentVolumeClaim:
             claimName: uploads-claim

staging/deployment-neo4j.yaml

@@ -17,23 +17,6 @@
         name: nitro-neo4j
       spec:
         containers:
-        - name: nitro-db-migration-worker
-          image: humanconnection/db-migration-worker:latest
-          imagePullPolicy: Always
-          envFrom:
-          - configMapRef:
-              name: db-migration-worker
-          env:
-          - name: COMMIT
-            value: <BACKEND_COMMIT>
-          - name: NEO4J_URI
-            value: bolt://localhost:7687
-          volumeMounts:
-          - name: secret-volume
-            readOnly: false
-            mountPath: /root/.ssh
-          - name: mongo-export
-            mountPath: /mongo-export/
         - name: nitro-neo4j
           image: humanconnection/neo4j:latest
           imagePullPolicy: Always
@@ -69,16 +52,7 @@
           volumeMounts:
             - mountPath: /data/
               name: neo4j-data
-            - mountPath: /mongo-export/
-              name: mongo-export
         volumes:
-        - name: secret-volume
-          secret:
-            secretName: ssh-keys
-            defaultMode: 0400
-        - name: mongo-export
-          persistentVolumeClaim:
-            claimName: mongo-export-claim
         - name: neo4j-data
           persistentVolumeClaim:
             claimName: neo4j-data-claim
@@ -96,15 +70,3 @@
     resources:
       requests:
         storage: 4Gi
----
-  kind: PersistentVolumeClaim
-  apiVersion: v1
-  metadata:
-    name: mongo-export-claim
-    namespace: staging
-  spec:
-    accessModes:
-      - ReadWriteOnce
-    resources:
-      requests:
-        storage: 1Gi