Create CI overlay (sourcegraph#4012)

* Create low resource overlay



Co-authored-by: Dave Try <[email protected]>

Author: daxmc99

overlays/low-resource/LimitRange.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: LimitRange
+metadata:
+  name: min-max-resources
+spec:
+
+  limits:
+  - max:
+      memory: 50G
+      cpu: "16"
+    min:
+      memory: 500M
+      cpu: 500m
+    type: Container

overlays/low-resource/README.md

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+# Low Resources overlay
+
+This overlay is intended for Sourcegraph internal CI tests. It removes resource requests including cpu, memory and persistent volumes to reduce load on shared clusters. 
+
+Note: `persistentVolumeClaim: null` is needed to avoid https://github.com/kubernetes-sigs/kustomize/issues/2037

overlays/low-resource/delete-resources-2.yaml

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+- op: remove
+  path: /spec/template/spec/containers/0/resources
+- op: remove
+  path: /spec/template/spec/containers/1/resources

overlays/low-resource/delete-resources.yaml

@@ -0,0 +1,2 @@
+- op: remove
+  path: /spec/template/spec/containers/0/resources

overlays/low-resource/gitserver-patch.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: not-used
+spec:
+  template:
+    spec:
+      containers:
+        - name: gitserver
+          env:
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                apiVersion: v1
+                fieldPath: metadata.name
+          volumeMounts:
+          - name: ci-volume
+            mountPath: /data/repos
+            subPathExpr: $(POD_NAME)
+      volumes:
+        - name: ci-volume
+          hostPath:
+            path: /mnt/disks/ssd0/buildkite/cluster-statefulset/
+            type: DirectoryOrCreate

overlays/low-resource/grafana-patch.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: not-used
+spec:
+  template:
+    spec:
+      containers:
+        - name: grafana
+          env:
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                apiVersion: v1
+                fieldPath: metadata.name
+          volumeMounts:
+          - name: ci-volume
+            mountPath: /var/lib/grafana
+            subPathExpr: $(POD_NAME)
+      volumes:
+        - name: ci-volume
+          hostPath:
+            path: /mnt/disks/ssd0/buildkite/cluster-statefulset/
+            type: DirectoryOrCreate

overlays/low-resource/indexed-search-patch.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: not-used
+spec:
+  template:
+    spec:
+      containers:
+        - name: zoekt-webserver
+          env:
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                apiVersion: v1
+                fieldPath: metadata.name
+          volumeMounts:
+          - name: ci-volume
+            mountPath: /data
+            subPathExpr: $(POD_NAME)
+        - name: zoekt-indexserver
+          env:
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                apiVersion: v1
+                fieldPath: metadata.name
+          volumeMounts:
+          - name: ci-volume
+            mountPath: /data
+            subPathExpr: $(POD_NAME)
+      volumes:
+        - name: ci-volume
+          hostPath:
+            path: /mnt/disks/ssd0/buildkite/cluster-statefulset/
+            type: DirectoryOrCreate