First commit

.drone.yaml

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+kind: pipeline
+name: pi-temperature-monitoring
+type: docker
+
+platform:
+  os: linux
+  arch: arm64
+
+steps:
+  - name: push-built-image
+    image: plugins/docker
+    settings:
+      context: app/
+      dockerfile: app/Dockerfile
+      registry: gitea.scubbo.org
+      repo: gitea.scubbo.org/scubbo/pi-temperature-monitoring
+      tags: ${DRONE_COMMIT_SHA:0:10}
+      debug: true
+      launch_debug: true
+      username: scubbo
+      password:
+        from_secret: gitea_password
+      settings:
+        mtu: 1450
+  - name: telegram_notification
+    image: appleboy/drone-telegram
+    settings:
+      token:
+        from_secret: telegram_token
+      to:
+        from_secret: telegram_convo_id
+
+image_pull_secrets:
+  - dockerconfigjson

README.md

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+Mount with `-v /usr/bin:/usr/bin -v /lib/aarch64-linux-gnu:/lib/aarch64-linux-gnu --device /dev/vchiq debian -p 8555:8555`
+
+See [here](https://unix.stackexchange.com/a/706181/30828)

app/Dockerfile

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+FROM debian
+
+RUN apt update
+RUN apt upgrade -y
+RUN apt install -y python3 python3-pip
+
+ADD requirements.txt /
+RUN pip3 install -r /requirements.txt
+
+ADD main.py /bin
+RUN chmod +x /bin/main.py
+

app/main.py

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+#!/usr/bin/env python3
+
+# https://pimylifeup.com/raspberry-pi-temperature/
+
+import time
+import subprocess
+
+from prometheus_client import start_http_server, Gauge, REGISTRY, GC_COLLECTOR, PLATFORM_COLLECTOR, PROCESS_COLLECTOR
+
+REGISTRY.unregister(GC_COLLECTOR)
+REGISTRY.unregister(PLATFORM_COLLECTOR)
+REGISTRY.unregister(PROCESS_COLLECTOR)
+
+def setup_gauge():
+    g = Gauge(f'sys_cpu_temp_celsius_degrees', 'CPU Temperature')
+    g.set_function(_get_temp)
+
+def _get_temp():
+    return float(subprocess.run(['/usr/bin/vcgencmd', 'measure_temp'], capture_output=True).stdout.decode('utf-8').replace('temp=', '').replace("'C\n", ''))
+
+if __name__ == '__main__':
+    setup_gauge()
+    start_http_server(8555)
+    while True:
+        # Stay alive!
+        time.sleep(1)
+

app/requirements.txt

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+prometheus-client
+

helm/Chart.yaml

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+apiVersion: v2
+name: piTemperatureMonitoring
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"

helm/templates/NOTES.txt

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+1. Get the application URL by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range $host := .Values.ingress.hosts }}
+  {{- range .paths }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "piTemperatureMonitoring.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "piTemperatureMonitoring.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "piTemperatureMonitoring.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "piTemperatureMonitoring.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
+{{- end }}

helm/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "piTemperatureMonitoring.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 "piTemperatureMonitoring.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 "piTemperatureMonitoring.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "piTemperatureMonitoring.labels" -}}
+helm.sh/chart: {{ include "piTemperatureMonitoring.chart" . }}
+{{ include "piTemperatureMonitoring.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "piTemperatureMonitoring.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "piTemperatureMonitoring.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "piTemperatureMonitoring.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "piTemperatureMonitoring.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

helm/templates/daemon-set.yaml

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+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: {{ include "piTemperatureMonitoring.fullname" . }}
+  labels:
+    {{- include "piTemperatureMonitoring.labels" . | nindent 4 }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "piTemperatureMonitoring.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      {{- with .Values.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      labels:
+        {{- include "piTemperatureMonitoring.selectorLabels" . | nindent 8 }}
+    spec:
+      securityContext:
+        {{- toYaml .Values.podSecurityContext | nindent 8 }}
+      containers:
+        - name: {{ .Chart.Name }}
+          securityContext:
+            {{- toYaml .Values.securityContext | nindent 12 }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - name: prometheus
+              containerPort: 8555
+              protocol: TCP
+          livenessProbe:
+            httpGet:
+              path: /
+              port: http
+          readinessProbe:
+            httpGet:
+              path: /
+              port: http
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+

helm/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "piTemperatureMonitoring.fullname" . }}
+  labels:
+    {{- include "piTemperatureMonitoring.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: prometheus
+      protocol: TCP
+      name: prometheus
+  selector:
+    {{- include "piTemperatureMonitoring.selectorLabels" . | nindent 4 }}

helm/values.yaml

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+# Default values for piTemperatureMonitoring.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+
+replicaCount: 1
+
+image:
+  repository: nginx
+  pullPolicy: IfNotPresent
+  # Overrides the image tag whose default is the chart appVersion.
+  tag: ""
+
+imagePullSecrets: []
+nameOverride: ""
+fullnameOverride: ""
+
+serviceAccount:
+  # Specifies whether a service account should be created
+  create: true
+  # Annotations to add to the service account
+  annotations: {}
+  # The name of the service account to use.
+  # If not set and create is true, a name is generated using the fullname template
+  name: ""
+
+podAnnotations: {}
+
+podSecurityContext: {}
+  # fsGroup: 2000
+
+securityContext: {}
+  # capabilities:
+  #   drop:
+  #   - ALL
+  # readOnlyRootFilesystem: true
+  # runAsNonRoot: true
+  # runAsUser: 1000
+
+service:
+  type: ClusterIP
+  port: 80
+
+ingress:
+  enabled: false
+  className: ""
+  annotations: {}
+    # kubernetes.io/ingress.class: nginx
+    # kubernetes.io/tls-acme: "true"
+  hosts:
+    - host: chart-example.local
+      paths:
+        - path: /
+          pathType: ImplementationSpecific
+  tls: []
+  #  - secretName: chart-example-tls
+  #    hosts:
+  #      - chart-example.local
+
+resources: {}
+  # We usually recommend not to specify default resources and to leave this as a conscious
+  # choice for the user. This also increases chances charts run on environments with little
+  # resources, such as Minikube. If you do want to specify resources, uncomment the following
+  # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  # limits:
+  #   cpu: 100m
+  #   memory: 128Mi
+  # requests:
+  #   cpu: 100m
+  #   memory: 128Mi
+
+autoscaling:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 100
+  targetCPUUtilizationPercentage: 80
+  # targetMemoryUtilizationPercentage: 80
+
+nodeSelector: {}
+
+tolerations: []
+
+affinity: {}