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универсальный_helm-чарт

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Helm - от основ до универсального чарта

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  • Нас ждет еще один, воспроизводимый в домашних условиях вебинар, на котором мы освоим “магический” синтаксис шаблонизатора из языка программирования Golang, который лежит в основе самого современного способа развертывания программного обеспечения - Kubernetes + Helm Charts + ArgoCD

Техническое задание

  • Освоить синтаксис написания Helm чартов
  • Написать универсальный чарт для развёртывание множества приложений
  • Установить ArgoCD и провести развертывание приложений в Kubernetes

Запись вебинара

  • Тэги: Kubernetes, Helm, ArgoCD

Шаг 1. Что у нас есть, для начала

Шаг 2. Последовательно изучаем синтаксис Helm, решая возникающие задачи

  • Разворачиваем первое приложение gowebd через Manifest
kube1:~/webd-k8s# mkdir -p uni-webd-chart/templates/

kube1:~/webd-k8s# cp my-webd-deployment.yaml uni-webd-chart/templates/my-webd-deployment.yaml
kube1:~/webd-k8s# cp my-webd-service.yaml uni-webd-chart/templates/my-webd-service.yaml
kube1:~/webd-k8s# cp my-ingress.yaml uni-webd-chart/templates/my-ingress.yaml
kube1:~/webd-k8s# cp my-certificate.yaml uni-webd-chart/templates/my-certificate.yaml

Итоговый чарт

kube1:~/webd-k8s# cat uni-webd-chart/Chart.yaml
apiVersion: v2
name: webd-chart
version: 0.1.0
kube1:~/webd-k8s# cat uni-webd-chart/values.yaml
#hostname: webd

#replicaCount: 2
#image:
#  repository: gitlab.corp13.un:5000/student/webd
#  tag: "ver1.1"

#env:
#  PYWEBD_DOC_ROOT: /var/www/
#  PYWEBD_PORT: 4080

service:
  port: 80
#  targetPort: 4080
#  type: LoadBalancer
#  ip: 192.168.13.65

ingress:
  enabled: false
  className: nginx
  hosts:
    - hostTemplate: "{{ .Values.hostname }}.{{ .Values.domain }}"
    ##- host: webd.corp13.un
    ##- host: corp13.un
  tls: []
#  tls:
#    - secretName: gowebd-tls
#      hosts:
#        - "{{ .Values.hostname }}.{{ .Values.domain }}"
##        - webd.corp13.un
##        - corp13.un

certificate:
  enabled: false
  secretName: webd-tls
  dnsNames:
    - "{{ .Values.hostname }}.{{ .Values.domain }}"
    ##- webd.corp13.un
    ##- "*.corp13.un"
  issuerRef_name: freeipa-dns-clusterissuer
  issuerRef_kind: ClusterIssuer

volumes: []
#volumes:
#- name: secret-tls-volume
#  secret:
#    secretName: pywebd-tls

volumeMounts: []
#volumeMounts:
#- name: secret-tls-volume
#  subPath: tls.crt
#  mountPath: /etc/pywebd/pywebd.crt
#- name: secret-tls-volume
#  subPath: tls.key
#  mountPath: /etc/pywebd/pywebd.key
kube1:~/webd-k8s# cat uni-webd-chart/templates/my-webd-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ .Release.Name }}-dep
spec:
  selector:
    matchLabels:
      app: {{ .Release.Name }}-lab
  replicas: {{ default 1 .Values.replicaCount }}
  template:
    metadata:
      labels:
        app: {{ .Release.Name }}-lab
    spec:
      containers:
      - name: my-webd
        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
        {{- with .Values.env }}
        env:
        {{- range $key, $val := . }}
        - name: {{$key}}
          value: {{$val|quote}}
        {{- end}}
        {{- end}}
        {{- with .Values.volumeMounts }}
        volumeMounts:
        {{- toYaml . | nindent 8 }}
        {{- end }}
      {{- with .Values.volumes }}
      volumes:
      {{- toYaml . | nindent 6 }}
      {{- end }}
kube1:~/webd-k8s# cat uni-webd-chart/templates/my-webd-service.yaml
apiVersion: v1
kind: Service
metadata:
  name: {{ .Release.Name }}-svc
spec:
  selector:
    app: {{ .Release.Name }}-lab
  ports:
  - protocol: TCP
    port: {{ .Values.service.port }}
{{- if hasKey .Values.service "targetPort" }}
    targetPort: {{ .Values.service.targetPort }}
{{- end }}
  type: {{ .Values.service.type | default "ClusterIP" }}
{{- if and (hasKey .Values.service "ip") (eq .Values.service.type "LoadBalancer") }}
  loadBalancerIP: {{ .Values.service.ip}}
{{- end }}
kube1:~/webd-k8s# cat uni-webd-chart/templates/my-ingress.yaml
{{- if .Values.ingress.enabled -}}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: {{ .Release.Name }}-ingress
spec:
  ingressClassName: {{ .Values.ingress.className }}
  rules:
  {{- range .Values.ingress.hosts }}
  {{- /*  - host: {{ .host }} */}}
  - host: {{ tpl .hostTemplate $ }}
    http:
      paths:
      - backend:
          service:
            name: {{ $.Release.Name }}-svc
            port:
              number: {{ default $.Values.service.port $.Values.service.targetPort}}
        path: /
        pathType: Prefix
  {{- end }}
  {{- if .Values.ingress.tls }}
  tls:
    {{- range .Values.ingress.tls }}
    - hosts:
        {{- range .hosts }}
        - {{ tpl . $ | quote }}
        {{- end }}
      secretName: {{ .secretName }}
    {{- end }}
  {{- end }}
{{- end }}
kube1:~/webd-k8s# cat uni-webd-chart/templates/my-certificate.yaml
{{- if .Values.certificate.enabled -}}
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
  name: {{ .Release.Name }}-cert
spec:
  secretName: {{ .Values.certificate.secretName }}
  dnsNames:
    {{- range .Values.certificate.dnsNames }}
    - {{ tpl . $ | quote }}
    {{- end }}
  issuerRef:
    name: {{ .Values.certificate.issuerRef_name }}
    kind: {{ .Values.certificate.issuerRef_kind }}
{{- end }}
kube1:~/webd-k8s# cp uni-webd-chart/values.yaml apps/gowebd/values.yaml

kube1:~/webd-k8s# cat apps/gowebd/values.yaml
hostname: gowebd

replicaCount: 2
image:
  repository: gitlab.corp13.un:5000/student/gowebd
  tag: "ver1.1"

ingress:
  enabled: true
  tls:
    - secretName: gowebd-tls
      hosts:
        - "{{ .Values.hostname }}.{{ .Values.domain }}"

certificate:
  enabled: true
  secretName: gowebd-tls
kube1:~/webd-k8s# helm template my-gowebd uni-webd-chart/ -f apps/gowebd/values.yaml -f env.yaml

kube1:~/webd-k8s# helm upgrade -i my-gowebd uni-webd-chart/ -f env.yaml -f apps/gowebd/values.yaml -n my-ns --create-namespace
kube1:~/webd-k8s# cat apps/apwebd/values.yaml
hostname: apwebd

image:
  repository: gitlab.corp13.un:5000/student/apwebd
  tag: "ver1.1"

env:
  APWEBD_HOSTNAME: "apwebd.corp13.un"
  KEYCLOAK_HOSTNAME: "keycloak.corp13.un"
  REALM_NAME: "corp13"

ingress:
  enabled: true
  tls:
    - secretName: apwebd-tls
      hosts:
        - "{{ .Values.hostname }}.{{ .Values.domain }}"

certificate:
  enabled: true
  secretName: apwebd-tls
kube1:~/webd-k8s# cat apps/pywebd/values.yaml
hostname: pywebd

image:
  repository: gitlab.corp13.un:5000/student/pywebd
  tag: "ver1.2"

env:
  PYWEBD_DOC_ROOT: /var/www/
  PYWEBD_PORT: 4080

service:
#  port: 80
  port: 443
  targetPort: 4080
  type: LoadBalancer
  ip: 192.168.13.65

certificate:
  enabled: true
  secretName: pywebd-tls

volumes:
- name: secret-tls-volume
  secret:
    secretName: pywebd-tls

volumeMounts:
- name: secret-tls-volume
  subPath: tls.crt
  mountPath: /etc/pywebd/pywebd.crt
- name: secret-tls-volume
  subPath: tls.key
  mountPath: /etc/pywebd/pywebd.key
kube1:~/webd-k8s# cat argocd/application.yaml
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: my-webd
  namespace: argocd
  finalizers:
  - resources-finalizer.argocd.argoproj.io
spec:
  project: default
  source:
    repoURL: 'https://gitlab.corp13.un/student/webd-k8s.git'
    path: uni-webd-chart

    helm:
      valueFiles:
      - ../apps/gowebd/values.yaml
      - ../env.yaml

  destination:
    server: 'https://kubernetes.default.svc'
    namespace: my-ns
  syncPolicy:
    automated: {}

    syncOptions:
      - CreateNamespace=true
kube1:~/webd-k8s# cat argocd/application-s.yaml
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: my-webd-s
  namespace: argocd
  finalizers:
  - resources-finalizer.argocd.argoproj.io
spec:
  generators:
  - git:
      repoURL: 'https://gitlab.corp13.un/student/webd-k8s.git'
      revision: main
      directories:
      - path: apps/*

  template:
    metadata:
      name: '{{path.basename}}'
      labels:
        name: apps
    spec:
      project: default
      sources:
      - repoURL: 'https://gitlab.corp13.un/student/webd-k8s.git'
        targetRevision: main
        path: uni-webd-chart
        helm:
          valueFiles:
          - $values/apps/{{path.basename}}/values.yaml
          - $values/env.yaml
      - repoURL: 'https://gitlab.corp13.un/student/webd-k8s.git'
        targetRevision: main
        ref: values

      destination:
        server: 'https://kubernetes.default.svc'
        namespace: my-ns
      syncPolicy:
        automated:
          prune: true
          selfHeal: true

        syncOptions:
        - CreateNamespace=true
универсальный_helm-чарт.txt · Last modified: 2026/01/12 11:07 by val

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