[stable/datadog] Support 1.6 tolerations (#1252)

* [stable/datadog] Support 1.6 tolerations

This allows the Datadog DaemonSet to run on tainted nodes, whether
that's a master provisioned by kubeadm (see #1100):

    tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/master

or any "dedicated" node:

    tolerations:
      - effect: NoSchedule
        operator: Exists

* [stable/datadog] Document 1.6 requirement for `tolerations`

* [stable/datadog] Add `daemonset.podAnnotations` value

This allows Kubernetes 1.5 users to use the alpha tolerations annotation
to schedule DataDog Pods on tainted nodes.

* [stable/datadog] Docs tweak: greater than 1.6

* [stable/datadog] Docs tweak: >= 1.6

stable/datadog/Chart.yaml

@@ -1,5 +1,5 @@
 name: datadog
-version: 0.5.0
+version: 0.6.0
 description: DataDog Agent
 keywords:
 - monitoring

stable/datadog/README.md

@@ -53,6 +53,8 @@ The following tables lists the configurable parameters of the Datadog chart and
 | `resources.limits.cpu`      | CPU resource limits                | 512Mi                                     |
 | `resources.requests.memory` | Memory resource requests           | 100m                                      |
 | `resources.limits.memory`   | Memory resource limits             | 256m                                      |
+| `daemonset.podAnnotations`  | Annotations to add to the DaemonSet's Pods | `nil`                             |
+| `daemonset.tolerations`     | List of node taints to tolerate (requires Kubernetes >= 1.6) | `nil`           |
 
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,

stable/datadog/templates/daemonset.yaml

@@ -12,6 +12,10 @@ spec:
       labels:
         app: {{ template "fullname" . }}
       name: {{ template "fullname" . }}
+      {{- if .Values.daemonset.podAnnotations }}
+      annotations:
+{{ toYaml .Values.daemonset.podAnnotations | indent 8 }}
+      {{- end }}
     spec:
       containers:
       - name: {{ .Chart.Name }}
@@ -89,5 +93,9 @@ spec:
         - name: autoconf
           configMap:
             name: {{ template "autoconf.fullname" . }}
+      {{- if .Values.daemonset.tolerations }}
+      tolerations:
+{{ toYaml .Values.daemonset.tolerations | indent 8 }}
+      {{- end }}
 {{ end }}
 {{ end }}

stable/datadog/values.yaml

@@ -13,6 +13,13 @@ image:
 daemonset:
   enabled: true
 
+  ## Annotations to add to the DaemonSet's Pods
+  # podAnnotations:
+  #   scheduler.alpha.kubernetes.io/tolerations: '[{"key": "example", "value": "foo"}]'
+
+  ## Allow the DaemonSet to schedule on tainted nodes (requires Kubernetes >= 1.6)
+  # tolerations: []
+
 # Apart from DaemonSet, deploy Datadog agent pods and related service for
 # applications that want to send custom metrics. Provides DogStasD service.
 #