Helm-Toolkit: Add snippet for kubernetes tolerations

This adds a helm-toolkit template for injecting pod tolerations
via values, similar to how container resources are handled. This
allows for custom definition of tolerations instead of defining
tolerations for pods directly into the pod templates

Change-Id: Ice520fcece425b14ae890ca5980fec9d7428a34d

fluent-logging/templates/daemonset-fluent-bit.yaml

@@ -93,12 +93,8 @@ spec:
         configmap-etc-hash: {{ tuple "configmap-etc.yaml" . | include "helm-toolkit.utils.hash" }}
     spec:
       serviceAccountName: {{ $serviceAccountName }}
-{{ if .Values.labels.fluentbit.tolerations }}
-      tolerations:
-      - key: node-role.kubernetes.io/master
-        operator: Exists
-      - key: node-role.kubernetes.io/node
-        operator: Exists
+{{ if $envAll.Values.pod.tolerations.fluentbit.enabled }}
+{{ tuple $envAll "fluentbit" | include "helm-toolkit.snippets.kubernetes_tolerations" | indent 6 }}
 {{ else }}
       nodeSelector:
         {{ .Values.labels.fluentbit.node_selector_key }}: {{ .Values.labels.fluentbit.node_selector_value | quote }}

fluent-logging/values.yaml

@@ -384,6 +384,14 @@ pod:
         limits:
           memory: '1024Mi'
           cpu: '2000m'
+  tolerations:
+    fluentbit:
+      enabled: false
+      tolerations:
+      - key: node-role.kubernetes.io/master
+        operator: Exists
+      - key: node-role.kubernetes.io/node
+        operator: Exists
   mounts:
     fluentd:
       fluentd:

helm-toolkit/templates/snippets/_kubernetes_tolerations.tpl

@@ -0,0 +1,47 @@
+{{/*
+Copyright 2017 The Openstack-Helm Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/}}
+
+{{/*
+abstract: |
+  Renders kubernetes tolerations for pods
+values: |
+  pod:
+    tolerations:
+      api:
+        enabled: true
+        tolerations:
+        - key: node-role.kubernetes.io/master
+          operator: Exists
+        - key: node-role.kubernetes.io/node
+          operator: Exists
+
+usage: |
+  {{ include "helm-toolkit.snippets.kubernetes_tolerations" ( tuple . .Values.pod.tolerations.api ) }}
+return: |
+  tolerations:
+  - key: node-role.kubernetes.io/master
+    operator: Exists
+  - key: node-role.kubernetes.io/node
+    operator: Exists
+*/}}
+
+{{- define "helm-toolkit.snippets.kubernetes_tolerations" -}}
+{{- $envAll := index . 0 -}}
+{{- $component := index . 1 -}}
+{{- $pod := index $envAll.Values.pod.tolerations $component }}
+tolerations:
+{{ toYaml $pod.tolerations }}
+{{- end -}}

prometheus-node-exporter/templates/daemonset.yaml

@@ -54,12 +54,8 @@ spec:
       namespace: {{ .Values.endpoints.node_metrics.namespace }}
     spec:
       serviceAccountName: {{ $serviceAccountName }}
-{{ if .Values.labels.node_exporter.tolerations }}
-      tolerations:
-      - key: node-role.kubernetes.io/master
-        operator: Exists
-      - key: node-role.kubernetes.io/node
-        operator: Exists
+{{ if .Values.pod.tolerations.node_exporter.enabled }}
+{{ tuple $envAll "node_exporter" | include "helm-toolkit.snippets.kubernetes_tolerations" | indent 6 }}
 {{ else }}
       nodeSelector:
         {{ .Values.labels.node_exporter.node_selector_key }}: {{ .Values.labels.node_exporter.node_selector_value | quote }}

prometheus-node-exporter/values.yaml

@@ -81,6 +81,14 @@ pod:
         limits:
           memory: "1024Mi"
           cpu: "2000m"
+  tolerations:
+    node_exporter:
+      enabled: false
+      tolerations:
+      - key: node-role.kubernetes.io/master
+        operator: Exists
+      - key: node-role.kubernetes.io/node
+        operator: Exists
 
 dependencies:
   dynamic: