🔧 First draft of helm

charts/node-specific-sizing/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

charts/node-specific-sizing/Chart.yaml

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+apiVersion: v2
+name: node-specific-sizing
+description: A Helm chart for Kubernetes
+type: application
+version: 0.1.0
+appVersion: "1.16.0"

charts/node-specific-sizing/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "node-specific-sizing.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 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 "node-specific-sizing.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "node-specific-sizing.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "node-specific-sizing.labels" -}}
+helm.sh/chart: {{ include "node-specific-sizing.chart" . }}
+{{ include "node-specific-sizing.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "node-specific-sizing.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "node-specific-sizing.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "node-specific-sizing.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "node-specific-sizing.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+{{/*
+Allow the release namespace to be overridden for multi-namespace deployments in combined charts
+*/}}
+{{- define "node-specific-sizing.namespace" -}}
+{{- if .Values.namespaceOverride }}
+{{- .Values.namespaceOverride }}
+{{- else }}
+{{- .Release.Namespace }}
+{{- end }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "node-specific-sizing.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "node-specific-sizing.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}

charts/node-specific-sizing/templates/_pod.tpl

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+{{- define "node-specific-sizing.pod" -}}
+serviceAccountName: {{ include "node-specific-sizing.serviceAccountName" . }}
+terminationGracePeriodSeconds: 10
+containers:
+    - name: {{ .Chart.Name }}
+      image: {{ .Values.image.registry }}/{{ .Values.image.tag }}@sha256:{{ .Values.image.sha256 }}
+      imagePullPolicy:  {{ .Values.image.pullPolicy }}
+          env:
+          - name: POD_NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
+          volumeMounts:
+            - mountPath: /tmp/k8s-webhook-server/serving-certs
+              name: cert
+              readOnly: true
+          securityContext:
+            runAsNonRoot: true
+      volumes:
+        - name: cert
+          secret:
+            defaultMode: 420
+            secretName: node-specific-sizing-cert
+{{- end }}

charts/node-specific-sizing/templates/clusterrole.yaml

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+{{- if and .Values.rbac.create (or (not .Values.rbac.namespaced) .Values.rbac.extraClusterRoleRules) (not .Values.rbac.useExistingClusterRole) }}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  labels: 
+    {{ - include "node-specific-sizing.labels" . | nindent 4 }}
+  {{- with .Values.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  name: {{ include "node-specific-sizing.fullname" . }}-clusterrole
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - nodes
+    verbs:
+      - get
+      - list
+      - watch
+    {{- with .Values.rbac.extraClusterRoleRules }}
+    {{- toYaml . | nindent 2 }}
+    {{- end}}
+{{- end }}

charts/node-specific-sizing/templates/clusterrolebinding.yaml

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+{{- if and .Values.rbac.create (or (not .Values.rbac.namespaced) .Values.rbac.extraClusterRoleRules) }}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: {{ include "node-specific-sizing.fullname" . }}-clusterrolebinding
+  labels: 
+    {{ - include "node-specific-sizing.labels" . | nindent 4 }}
+  {{- with .Values.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  {{- if .Values.rbac.useExistingClusterRole }}
+  name: {{ .Values.rbac.useExistingClusterRole }}
+  {{- else }}
+  name: {{ include "node-specific-sizing.fullname" . }}-clusterrole
+  {{- end }}
+subjects:
+- kind: ServiceAccount
+  name: {{ include "node-specific-sizing.serviceAccountName" . }}
+  namespace: {{ include "node-specific-sizing.namespace" . }}
+{{- end }}

charts/node-specific-sizing/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "node-specific-sizing.fullname" . }}
+  labels:
+    {{- include "node-specific-sizing.labels" . | nindent 4 }}
+  {{- if .Values.deployment.annotations }}
+  annotations:
+    {{- toYaml .Values.deployment.annotations | nindent 4 }}
+spec:
+  replicas: {{ .Values.deployment.replicas }}
+  selector:
+    matchLabels:
+      app: {{- include "node-specific-sizing.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "node-specific-sizing.labels" . | nindent 4 }}
+    spec:
+      {{- include "node-specific-sizing.pod" . | nindent 6 }}
+

charts/node-specific-sizing/templates/mutatingadmissionwebhook.yaml

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+kind: MutatingWebhookConfiguration
+apiVersion: admissionregistration.k8s.io/v1
+metadata:
+  name: {{ include "node-specific-sizing.fullname" . }}
+  annotations:
+    cert-manager.io/inject-ca-from: kube-system/{{ include "node-specific-sizing.fullname" . }}-client-cert
+webhooks:
+  - name: {{ include "node-specific-sizing.fullname" . }}.svc.cluster.local
+    objectSelector:
+      matchLabels:
+        node-specific-sizing.manomano.tech/enabled: "true"
+    admissionReviewVersions: [ "v1" ]
+    sideEffects: None
+    failurePolicy: Ignore
+    timeoutSeconds: 2
+    clientConfig:
+      service:
+        namespace: kube-system
+        name: {{ include "node-specific-sizing.fullname" . }}
+        path: /mutate
+    rules:
+      - apiGroups: [""]
+        apiVersions: ["v1"]
+        resources: ["pods"]
+        operations: ["CREATE"]
+        scope: Namespaced
+

charts/node-specific-sizing/templates/service.yaml

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+{{- if .Values.service.enabled }}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "node-specific-sizing.fullname" . }}
+  namespace: {{ include "node-specific-sizing.namespace" . }}
+  labels:
+    {{- include "node-specific-sizing.labels" . | nindent 4 }}
+spec:
+  {{- if (or (eq .Values.service.type "ClusterIP") (empty .Values.service.type)) }}
+  type: ClusterIP
+  {{- with .Values.service.clusterIP }}
+  clusterIP: {{ . }}
+  {{- end }}
+  {{- else if eq .Values.service.type "LoadBalancer" }}
+  type: LoadBalancer
+  {{- with .Values.service.loadBalancerIP }}
+  loadBalancerIP: {{ . }}
+  {{- end }}
+  {{- with .Values.service.loadBalancerClass }}
+  loadBalancerClass: {{ . }}
+  {{- end }}
+  {{- with .Values.service.loadBalancerSourceRanges }}
+  loadBalancerSourceRanges:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- else }}
+  type: {{ .Values.service.type }}
+  {{- end }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: {{ .Values.service.targetPort }}
+      protocol: TCP
+      name: {{ .Values.service.portName }}
+  selector:
+    {{- include "node-specific-sizing.selectorLabels" . | nindent 4 }}
+{{- end }}

charts/node-specific-sizing/templates/serviceaccount.yaml

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+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+automountServiceAccountToken: {{ .Values.serviceAccount.autoMount }}
+metadata:
+  name: {{ include "node-specific-sizing.serviceAccountName" . }}
+  labels:
+    {{- include "node-specific-sizing.labels" . | nindent 4 }}
+    {{- with .Values.serviceAccount.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+  {{- with .Values.serviceAccount.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}

charts/node-specific-sizing/templates/tests/test-connection.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: "{{ include "knss.fullname" . }}-test-connection"
+  labels:
+    {{- include "knss.labels" . | nindent 4 }}
+  annotations:
+    "helm.sh/hook": test
+spec:
+  containers:
+    - name: wget
+      image: busybox
+      command: ['wget']
+      args: ['{{ include "knss.fullname" . }}:{{ .Values.service.port }}']
+  restartPolicy: Never

charts/node-specific-sizing/values.yaml

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+
+global:
+  imageRegistry: docker.io
+
+image:
+  sha: ""
+
+annotations: {}
+
+rbac:
+  create: true
+  ## Use an existing ClusterRole/Role (depending on rbac.namespaced false/true)
+  # useExistingRole: name-of-some-role
+  # useExistingClusterRole: name-of-some-clusterRole
+  extraClusterRoleRules: []
+  # - apiGroups: []
+  #   resources: []
+  #   verbs: []
+
+## Override the deployment namespace
+##
+namespaceOverride: ""
+
+serviceAccount:
+  autoMount: true
+  labels: {}
+  annotations: {}