helm使用

helm

0. helm安装

基本上到github上面，下载二进制就行。mac的话用brew安装。

https://github.com/helm/helm

brew:

brew install kubernetes-helm

1. helm基本操作

helm create xx 创建一个chart

helm install chartxx 安装

helm uninstall chartxx 卸载

helm upgrade chartxx  更新

helm template 渲染

helm list 列出已经deploy的应用

v3版本以后使用很方便，不需要repo的操作了，kubeconfig 有了就能用。需要注意先指定kubeconfig的环境变量。或者放到~/.kube/config。

2. helm init (v3已经不需要了)

helm init --upgrade --tiller-image registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.9.1 --stable-repo-url https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts

将tiller的版本换了。kube-system应该会有tiller-deploy的deployment，启动就ok。

# kubectl get deployments.apps  -n kube-system

NAME                      READY   UP-TO-DATE   AVAILABLE   AGE

calico-kube-controllers   1/1     1            1           6d8h

coredns                   2/2     2            2           6d8h

tiller-deploy             1/1     1            1           2d19h

添加serviceaccount,clusterrolebinding:

kubectl create serviceaccount --namespace kube-system tiller

kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller

kubectl patch deploy --namespace kube-system tiller-deploy -p '{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'

卸载helm :

helm reset

3. chart 包制作

helm create

#helm create qymapp

#ls qymapp

charts  Chart.yaml  templates  values.yaml

修改相应文件,打包chart

4. chart 使用

helm install --dry-run --debug <chart_dir> --name <release_name>

# helm install  --debug local/qymapp --name qym-test

[debug] Created tunnel using local port: '42233'

[debug] SERVER: "127.0.0.1:42233"

[debug] Original chart version: ""

[debug] Fetched local/qymapp to /root/.helm/cache/archive/qymapp-0.1.0.tgz

[debug] CHART PATH: /root/.helm/cache/archive/qymapp-0.1.0.tgz

NAME:   qym-test

REVISION: 1

RELEASED: Wed Oct 23 16:54:34 2019

CHART: qymapp-0.1.0

USER-SUPPLIED VALUES:

{}

COMPUTED VALUES:

affinity: {}

fullnameOverride: ""

image:

  pullPolicy: IfNotPresent

  repository: nginx

  tag: stable

imagePullSecrets: []

ingress:

  annotations: {}

  enabled: false

  hosts:

  - host: chart-example.local

    paths: []

  tls: []

nameOverride: ""

nodeSelector: {}

podSecurityContext: {}

replicaCount: 1

resources: {}

securityContext: {}

service:

  port: 80

  type: ClusterIP

serviceAccount:

  create: true

  name: null

tolerations: []

HOOKS:

---

# qym-test-qymapp-test-connection

apiVersion: v1

kind: Pod

metadata:

  name: "qym-test-qymapp-test-connection"

  labels:

    app.kubernetes.io/name: qymapp

    helm.sh/chart: qymapp-0.1.0

    app.kubernetes.io/instance: qym-test

    app.kubernetes.io/version: "1.0"

    app.kubernetes.io/managed-by: Tiller

  annotations:

    "helm.sh/hook": test-success

spec:

  containers:

    - name: wget

      image: busybox

      command: ['wget']

      args:  ['qym-test-qymapp:80']

  restartPolicy: Never

MANIFEST:

---

# Source: qymapp/templates/serviceaccount.yaml

apiVersion: v1

kind: ServiceAccount

metadata:

  name: qym-test-qymapp

  labels:

    app.kubernetes.io/name: qymapp

    helm.sh/chart: qymapp-0.1.0

    app.kubernetes.io/instance: qym-test

    app.kubernetes.io/version: "1.0"

    app.kubernetes.io/managed-by: Tiller

---

# Source: qymapp/templates/service.yaml

apiVersion: v1

kind: Service

metadata:

  name: qym-test-qymapp

  labels:

    app.kubernetes.io/name: qymapp

    helm.sh/chart: qymapp-0.1.0

    app.kubernetes.io/instance: qym-test

    app.kubernetes.io/version: "1.0"

    app.kubernetes.io/managed-by: Tiller

spec:

  type: ClusterIP

  ports:

    - port: 80

      targetPort: http

      protocol: TCP

      name: http

  selector:

    app.kubernetes.io/name: qymapp

    app.kubernetes.io/instance: qym-test

---

# Source: qymapp/templates/deployment.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

  name: qym-test-qymapp

  labels:

    app.kubernetes.io/name: qymapp

    helm.sh/chart: qymapp-0.1.0

    app.kubernetes.io/instance: qym-test

    app.kubernetes.io/version: "1.0"

    app.kubernetes.io/managed-by: Tiller

spec:

  replicas: 1

  selector:

    matchLabels:

      app.kubernetes.io/name: qymapp

      app.kubernetes.io/instance: qym-test

  template:

    metadata:

      labels:

        app.kubernetes.io/name: qymapp

        app.kubernetes.io/instance: qym-test

    spec:

      serviceAccountName: qym-test-qymapp

      securityContext:

        {}

      containers:

        - name: qymapp

          securityContext:

            {}

          image: "nginx:stable"

          imagePullPolicy: IfNotPresent

          ports:

            - name: http

              containerPort: 80

              protocol: TCP

          livenessProbe:

            httpGet:

              path: /

              port: http

          readinessProbe:

            httpGet:

              path: /

              port: http

          resources:

            {}

LAST DEPLOYED: Wed Oct 23 16:54:34 2019

NAMESPACE: default

STATUS: DEPLOYED

RESOURCES:

==> v1/Deployment

NAME             READY  UP-TO-DATE  AVAILABLE  AGE

qym-test-qymapp  0/1    1           0          0s

==> v1/Pod(related)

NAME                              READY  STATUS             RESTARTS  AGE

qym-test-qymapp-5d4bcc5db7-xdrh5  0/1    ContainerCreating  0         0s

==> v1/Service

NAME             TYPE       CLUSTER-IP      EXTERNAL-IP  PORT(S)  AGE

qym-test-qymapp  ClusterIP  10.108.218.211  <none>       80/TCP   0s

==> v1/ServiceAccount

NAME             SECRETS  AGE

qym-test-qymapp  1        0s

NOTES:

1. Get the application URL by running these commands:

  export POD_NAME=$(kubectl get pods --namespace default -l "app.kubernetes.io/name=qymapp,app.kubernetes.io/instance=qym-test" -o jsonpath="{.items[0].metadata.name}")

  echo "Visit http://127.0.0.1:8080 to use your application"

  kubectl port-forward $POD_NAME 8080:80

# helm list

NAME    	REVISION	UPDATED                 	STATUS  	CHART       	APP VERSION	NAMESPACE

qym-test	1       	Wed Oct 23 16:54:34 2019	DEPLOYED	qymapp-0.1.0	1.0        	default

升级chart包，修改一下

# helm package  qymapp

Successfully packaged chart and saved it to: /root/.helm/repository/local/qymapp-0.2.0.tgz

# ls

index.yaml  qymapp  qymapp-0.1.0.tgz  qymapp-0.2.0.tgz

# helm search qymapp -l

NAME        	CHART VERSION	APP VERSION	DESCRIPTION

local/qymapp	0.2.0        	1.0        	A Helm chart for Kubernetes

local/qymapp	0.1.0        	1.0        	A Helm chart for Kubernetes

helm upgrade qym-test  local/qymapp

Release "qym-test" has been upgraded.

LAST DEPLOYED: Wed Oct 23 17:17:13 2019

NAMESPACE: default

STATUS: DEPLOYED

# helm list

NAME    	REVISION	UPDATED                 	STATUS  	CHART       	APP VERSION	NAMESPACE

qym-test	2       	Wed Oct 23 17:17:13 2019	DEPLOYED	qymapp-0.2.0	1.0        	default

v3 不需要package ,直接helm upgrade就行了。是不是很方便。再也回不去了。

参考:

https://helm.sh/

官方文档很不错，重要的几个点都讲了。

这篇文章还缺怎么制作chart包，未完待续。

巴特西