Configurable lifecycle hooks for controller container (#28)

haproxy-ingress/README.md

@@ -103,6 +103,7 @@ Parameter | Description | Default
 `controller.hostNetwork` | Optionally set to true when using CNI based kubernetes installations | `false`
 `controller.dnsPolicy` | Optionally change this to ClusterFirstWithHostNet in case you have 'hostNetwork: true' | `ClusterFirst`
 `controller.terminationGracePeriodSeconds` | How much to wait before terminating a pod (in seconds) | `60`
+`controller.lifecycle` | Lifecycle hooks for controller container | `{}`
 `controller.kind` | Type of deployment, DaemonSet or Deployment | `Deployment`
 `controller.tcp` | TCP [service ConfigMap](https://haproxy-ingress.github.io/docs/configuration/command-line/#tcp-services-configmap): `<port>: <namespace>/<servicename>:<portnumber>[:[<in-proxy>][:<out-proxy>]]` | `{}`
 `controller.enableStaticPorts` | Set to `false` to only rely on ports from `controller.tcp` | `true`

haproxy-ingress/templates/_podtemplate.yaml

@@ -119,6 +119,10 @@ spec:
 {{- end }}
       resources:
         {{- toYaml .Values.controller.resources | nindent 8 }}
+{{- if .Values.controller.lifecycle }}
+      lifecycle:
+        {{- toYaml .Values.controller.lifecycle | nindent 8 }}
+{{- end }}
 {{- if .Values.controller.logs.enabled }}
     - name: access-logs
       image:  "{{ .Values.controller.logs.image.repository }}:{{ .Values.controller.logs.image.tag }}"

haproxy-ingress/values.yaml

@@ -119,6 +119,12 @@ controller:
   # How many seconds to wait before terminating a pod.
   terminationGracePeriodSeconds: 60
 
+  # Configure container lifecycle. When scaling replicas down this can be
+  # used to prevent controller container from terminating quickly and drop in-flight requests.
+  # For example, when the controller runs behind Network Load Balancer this can be used
+  # to configure preStop hook to sleep along with deregistration_delay.
+  lifecycle: {}
+
   ## DaemonSet or Deployment
   ##
   kind: Deployment