实现yaml高效复用，通过传递参数，动态渲染模板，yaml内容动态传入参数生成

    1. cd mychart
    3. cat >> values.yaml << EOF
    4. replicas: 1
    5. image: nginx
    6. tag: 1.16
    7. label: web1
    8. port: 80
    10. serviceAccount:
    11.   # Specifies whether a service account should be created
    12.   create: true
    13.   # Annotations to add to the service account
    14.   annotations: {}
    15.   # The name of the service account to use.
    16.   # If not set and create is true, a name is generated using the fullname template
    17.   name: ""
    19. podAnnotations: {}
    21. podSecurityContext: {}
    22.   # fsGroup: 2000
    24. securityContext: {}
    26. service:
    27.   type: ClusterIP
    28.   port: 80
    30. ingress:
    31.   enabled: false
    32.   annotations: {}
    33.     # kubernetes.io/ingress.class: nginx
    34.     # kubernetes.io/tls-acme: "true"
    35.   hosts:
    36.     - host: chart-example.local
    37.       paths: []
    38.   tls: []
    39.   #  - secretName: chart-example-tls
    40.   #    hosts:
    41.   #      - chart-example.local
    43. resources: {}
    45. autoscaling:
    46.   enabled: false
    47.   minReplicas: 1
    48.   maxReplicas: 100
    49.   targetCPUUtilizationPercentage: 80
    50.   # targetMemoryUtilizationPercentage: 80
    52. nodeSelector: {}
    54. tolerations: []
    56. affinity: {}
    57. EOF

    在templates的yaml文件中使用values.yaml定义变量

    • 通过表达式使用全局变量：{{ .Values.变量名称}}
    • 获取当前版本：{{ .Release.Name}}
      apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
  app: {{ .Values.label}}
name: {{ .Release.Name}}-deployment
spec:
replicas: {{ .Values.replicas}}
selector:
  matchLabels:
    app: {{ .Values.label}}
strategy: {}
template:
  metadata:
    creationTimestamp: null
    labels:
      app: web1
  spec:
    containers:
    - image: {{ .Values.image}}
      name: nginx
      resources: {}
status: {}

    apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: {{ .Values.label}}
  name: {{ .Release.Name}}-svc
spec:
  ports:
  - port: {{ .Values.port}}
    protocol: TCP
    targetPort: {{ .Values.port}}
  selector:
    app: {{ .Values.label}}
  type: NodePort
status:
  loadBalancer: {}

    尝试运行，会打印所有yaml文件

    [root@k8s-master01 helm]# helm install web2 myChart --dry-run
NAME: web2
LAST DEPLOYED: Tue May  4 18:01:07 2021
NAMESPACE: default
STATUS: pending-install
REVISION: 1
TEST SUITE: None
HOOKS:
MANIFEST:
---
# Source: myChart/templates/service.yaml
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: web1
  name: web2-svc
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: web1
  type: NodePort
status:
  loadBalancer: {}
---
# Source: myChart/templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: web1
  name: web2-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: web1
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: web1
    spec:
      containers:
      - image: nginx
        name: nginx
        resources: {}
status: {}

    启动

    helm install web2 myChart

    查看部署情况：

    kubectl get pods,svc

    image.png

    查看helm list

    [root@k8s-master01 helm]# helm list
NAME    NAMESPACE    REVISION    UPDATED                                    STATUS      CHART                 APP VERSION
ui      default      1           2021-05-04 16:14:42.544918429 +0800 CST    deployed    weave-scope-1.1.12    1.12.0     
web1    default      1           2021-05-04 17:49:36.858245738 +0800 CST    deployed    myChart-0.2.0         1.16.0     
web2    default      1           2021-05-04 18:02:09.10007188 +0800 CST     deployed    myChart-0.2.0         1.16.0