Cloud-Native Microservices With Kubernetes - 2nd Edition

apiVersion: apps/v1
kind: Deployment
metadata:
  # Uses a predefined Helm function to get
  # a full name composed of the release name
  # and the chart name
  name: {{ include "hello-world.fullname" . }}

  labels:
    # Inserts labels defined in the
    # "hello-world.labels" template
    {{- include "hello-world.labels" . | nindent 4 }}
spec:
  # Checks if autoscaling is not enabled
  # in the values file
  {{- if not .Values.autoscaling.enabled }}
  # Sets the replica count based on the values file
  replicas: {{ .Values.replicaCount }}
  {{- end }}
  selector:
    matchLabels:
      # Inserts selector labels defined in the
      # "hello-world.selectorLabels" template
      {{- include "hello-world.selectorLabels" . | nindent 6 }}
  template:
    metadata:
      # Checks if podAnnotations are provided in the values file
      {{- with .Values.podAnnotations }}
      annotations:
        # Converts the podAnnotations to YAML
        {{- toYaml . | nindent 8 }}
      {{- end }}
      labels:
        # Inserts selector labels defined in the
        # "hello-world.selectorLabels" template
        {{- include "hello-world.selectorLabels" . | nindent 8 }}
    spec:
      # Checks if imagePullSecrets are provided
      # in the values file
      {{- with .Values.imagePullSecrets }}
      imagePullSecrets:
        # Converts the imagePullSecrets to YAML
        {{- toYaml . | nindent 8 }}
      {{- end }}
      # Uses a predefined Helm function to get
      # the service account name
      serviceAccountName: {{ include "hello-world.serviceAccountName" . }}
      securityContext:
        # Converts the podSecurityContext
        # from the values file to YAML
        {{- toYaml .Values.podSecurityContext | nindent 8 }}
      containers:
        - name: {{ .Chart.Name }}
          securityContext:
            # Converts the securityContext from
            # the values file to YAML
            {{- toYaml .Values.securityContext | nindent 12 }}
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"