charts/cluster-warmer: Create chart (closes #101)

charts/cluster-warmer/Chart.yaml

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+apiVersion: v2
+name: cluster-warmer
+description: A Helm Chart to deploy pods to force scaling in a node-pool to keep it warm
+version: 0.1.0
+icon: https://raw.githubusercontent.com/snowplow-devops/helm-charts/master/docs/logo/snowplow.png
+home: https://github.com/snowplow-devops/helm-charts
+sources:
+  - https://github.com/snowplow-devops/helm-charts
+maintainers:
+  - name: jbeemster
+    url: https://github.com/jbeemster
+    email: [email protected]
+keywords:
+  - cluster-autoscaler

charts/cluster-warmer/README.md

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+# cluster-warmer
+
+![Version: 0.1.0](https://img.shields.io/badge/Version-0.1.0-informational?style=flat-square)
+
+A Helm Chart to deploy pods to force scaling in a node-pool to keep it warm
+
+**Homepage:** <https://github.com/snowplow-devops/helm-charts>
+
+## Maintainers
+
+| Name | Email | Url |
+| ---- | ------ | --- |
+| jbeemster | <[email protected]> | <https://github.com/jbeemster> |
+
+## Source Code
+
+* <https://github.com/snowplow-devops/helm-charts>
+
+## Values
+
+| Key | Type | Default | Description |
+|-----|------|---------|-------------|
+| fullnameOverride | string | `""` | Overrides the full-name given to the deployment resources (default: .Release.Name) |
+| hpa.replicas | int | `1` | Number of replicas to setup to manage how many warm nodes are created |
+| image.isRepositoryPublic | bool | `true` | Whether the repository is public |
+| image.pullPolicy | string | `"IfNotPresent"` | The image pullPolicy to use |
+| image.repository | string | `"registry.k8s.io/pause"` |  |
+| image.tag | string | `"3.9"` |  |
+| resources | object | `{}` | Map of resource constraints for the warm pods (should be set to a sufficiently high number to trigger scaling) |
+
+----------------------------------------------
+Autogenerated from chart metadata using [helm-docs v1.11.0](https://github.com/norwoodj/helm-docs/releases/v1.11.0)

charts/cluster-warmer/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Create a default fully qualified app name.
+We truncate at 50 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "app.fullname" -}}
+{{- if .Values.fullnameOverride -}}
+{{- .Values.fullnameOverride | trunc 50 | trimSuffix "-" -}}
+{{- else -}}
+{{- .Release.Name | trunc 50 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}

charts/cluster-warmer/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "app.fullname" . }}
+spec:
+  selector:
+    matchLabels:
+      app: {{ include "app.fullname" . }}
+  template:
+    metadata:
+      labels:
+        app: {{ include "app.fullname" . }}
+    spec:
+      priorityClassName: {{ include "app.fullname" . }}
+      terminationGracePeriodSeconds: 0
+      containers:
+      - name: "{{ include "app.fullname" . }}"
+        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+        imagePullPolicy: {{ default "IfNotPresent" .Values.image.pullPolicy }}
+        resources:
+          {{- toYaml .Values.resources | nindent 10 }}

charts/cluster-warmer/templates/hpa.yaml

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+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "app.fullname" . }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ include "app.fullname" . }}
+  minReplicas: {{ .Values.hpa.replicas }}
+  maxReplicas: {{ .Values.hpa.replicas }}
+  targetCPUUtilizationPercentage: 95

charts/cluster-warmer/templates/priorityclass.yaml

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+apiVersion: scheduling.k8s.io/v1
+kind: PriorityClass
+metadata:
+  name: {{ include "app.fullname" . }}
+value: -1
+globalDefault: false

charts/cluster-warmer/values.yaml

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+# -- Overrides the full-name given to the deployment resources (default: .Release.Name)
+fullnameOverride: ""
+
+image:
+  repository: "registry.k8s.io/pause"
+  tag: "3.9"
+  # -- Whether the repository is public
+  isRepositoryPublic: true
+  # -- The image pullPolicy to use
+  pullPolicy: "IfNotPresent"
+
+# -- Map of resource constraints for the warm pods (should be set to a sufficiently high number to trigger scaling)
+resources: {}
+#  requests:
+#    cpu: 400m
+
+hpa:
+  # -- Number of replicas to setup to manage how many warm nodes are created
+  replicas: 1