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K8s:通过 Helmify 实现将 YAML 文件 转化为 Helm Charts


写在前面

  • 分享一个 ​​Yaml​​​ 资源文件转 ​​Helm Charts​​​ 包的小工具 ​​helmify​
  • 博文内容涉及:
  • ​helmify​​ 工具安装,简单使用
  • ​YAML​​ 静态文件转化为 HELM charts 包
  • 从 ​​kustomize​​​ 输出转化为 ​​Helm​
  • 理解不足小伙伴帮忙指正
  • 博文涉及 ​​helmify​

我心匪石,不可转也。我心匪席,不可卷也。——《邶风·柏舟》

简单介绍及安装

如果部署环境涉及的 k8s API 资源比较多,往往会通过定义一个 charts 包来统一管理,变动的部分通过模板变量的方式引用。

正常我们创建一个 Helm chart 包。会通过命令 ​​helm create​​ 来创建

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm create liruilonghelm
Creating liruilonghelm
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$ls
index.yaml liruilonghelm mysql mysql-1.6.4.tgz

打包 push 私有 helm 源会通过下面的命令操作

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm package liruilonghelm/
Successfully packaged chart and saved it to: /root/ansible/k8s-helm-create/liruilonghelm-0.1.0.tgz

那么对于已经存在的 yaml 资源文件,或者部署的集群中的环境,如何生成 chart 包,可以把对应的 资源文件导出来,然后手工编写对应的 charts 包,类似 Ansible 中 角色的编写。

通过 ​​helmify​​ 我们可以把上面的过程变成自动的。helmify 支持大部分的 api 资源转化为 对应的 charts 包。Helmify 从 标准输入 读取支持的 k8s 对象列表,并将其转换为 helm chasrts。

我们还可以获得 k8s 上现有服务的 YAML 文件,并可以将其转换为使用 helmify。

​helmify​​ 支持的 k8s 资源:

  • deployment
  • daemonset
  • service, Ingress
  • PersistentVolumeClaim
  • RBAC (serviceaccount, (cluster-)role, (cluster-)rolebinding)
  • configs (configmap, secret)
  • webhooks (cert, issuer, ValidatingWebhookConfiguration)
  • custom resource definitions

下载安装

下载二进制安装包

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$wget https://github.com/arttor/helmify/releases/download/v0.3.22/helmify_0.3.22_Linux_64-bit.tar.gz

解压,配置为可执行文件

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$tar -zxvf helmify_0.3.22_Linux_64-bit.tar.gz
helmify
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$chmod +x helmify
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$mv helmify /usr/local/bin/
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helmify -version
Version: 0.3.22
Build Time: 2022-12-17T15:55:46Z
Git Commit: 253310a3cd32156f6952e9a4a9ec4d1e387f7775

这里需要注意支持 ​​Helm >=v3.6.0​

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm version
version.BuildInfo{Version:"v3.2.1", GitCommit:"fe51cd1e31e6a202cba7dead9552a6d418ded79a", GitTreeState:"clean", GoVersion:"go1.13.10"}

如果 helm 版本太旧的话,需要更新 Helm

┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$tar -zxvf helm-v3.11.0-rc.1-linux-amd64.tar.gz
linux-amd64/
linux-amd64/helm
linux-amd64/LICENSE
linux-amd64/README.md
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$mv linux-amd64/helm /usr/local/bin/
mv:是否覆盖"/usr/local/bin/helm"? y
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$helm version
version.BuildInfo{Version:"v3.11.0-rc.1", GitCommit:"9d8fee155bd7e7d3c1390f4076d9271a1147dce5", GitTreeState:"clean", GoVersion:"go1.18.9"}
┌──[root@vms81.liruilongs.github.io]-[~/ansible/k8s-helm-create]
└─$

使用方式

将 YAML 文件转换为 Helm chart 包

dashboard 创建服务账号 ​​sa​​ 的一个 yaml 文件。

┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$cat dashboard-adminuser.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kubernetes-dashboard

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kubernetes-dashboard
┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$cat dashboard-adminuser.yaml | helmify mychart

可以通过下面的方式生成 charts 包

┌──[root@vms81.liruilongs.github.io]-[~/ansible]
└─$cat dashboard-adminuser.yaml | helmify mychart

生成的数据文件信息

┌──[root@vms81.liruilongs.github.io]-[~/ansible/mychart]
└─$tree -h
.
├── [1.1K] Chart.yaml
├── [ 77] templates
│ ├── [ 405] admin-user-rbac.yaml
│ ├── [ 157] deployment.yaml
│ └── [1.7K] _helpers.tpl
└── [ 39] values.yaml

1 directory, 5 files

可以通过下面的命令查看生成的 ​​charts​​ 包 的资源文件

┌──[root@vms81.liruilongs.github.io]-[~/ansible/mychart]
└─$helm template ./
---
# Source: mychart/templates/deployment.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: release-name-mychart-admin-user
labels:
helm.sh/chart: mychart-0.1.0
app.kubernetes.io/name: mychart
app.kubernetes.io/instance: release-name
app.kubernetes.io/version: "0.1.0"
app.kubernetes.io/managed-by: Helm
---
# Source: mychart/templates/admin-user-rbac.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: release-name-mychart-admin-user
labels:
helm.sh/chart: mychart-0.1.0
app.kubernetes.io/name: mychart
app.kubernetes.io/instance: release-name
app.kubernetes.io/version: "0.1.0"
app.kubernetes.io/managed-by: Helm
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: 'release-name-mychart-admin-user'
namespace: 'liruilong-topo-namespace'
┌──[root@vms81.liruilongs.github.io]-[~/ansible/mychart]
└─$

也可以从带有 yamls 的目录生成:

awk 'FNR==1 && NR!=1  {print "---"}{print}' /<my_directory>/*.yaml | helmify mychart

从kustomize输出转换为 Helm chart 包

一个简单的 Demo

下面为一个 ​​kustomize​​ 元文件。

┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$cat kustomization.yaml
namespace: my-namespace
namePrefix: dev-
nameSuffix: "-001"
commonLabels:
app: liruilong-app
commonAnnotations:
isDemo: "true"
configMapGenerator:
- name: example-configmap-liruilong-env
literals:
- FOO=Bar

通过下面的命令我们可以看到 ​​kustomize​​ 生成的 yaml 文件的内容。

┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$kustomize build ./
apiVersion: v1
data:
FOO: Bar
kind: ConfigMap
metadata:
annotations:
isDemo: "true"
labels:
app: liruilong-app
name: dev-example-configmap-liruilong-env-001-42cfbf598f
namespace: my-namespace

使用下面的命令我们可以生成上面 ​​kustomize build​​​ 生成的 ​​charts​​ 包

┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$kustomize build ./ | helmify mychart
┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$ls
kustomization.yaml mychart
┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$tree -h mychart/
mychart/
├── [1.1K] Chart.yaml
├── [ 89] templates
│ ├── [ 333] dev-example-configmap-liruilong-env-001-42cfbf598f.yaml
│ └── [1.7K] _helpers.tpl
└── [ 96] values.yaml

1 directory, 4 files
┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$

查看生成的 ​​charts​​​ 包的 ​​yaml​​ 资源内容。

┌──[root@vms81.liruilongs.github.io]-[~/kustomize/failed]
└─$helm template ./mychart
---
# Source: mychart/templates/dev-example-configmap-liruilong-env-001-42cfbf598f.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: release-name-mychart-dev-example-configmap-liruilong-env-001-42cfbf598f
labels:
app: liruilong-app
helm.sh/chart: mychart-0.1.0
app.kubernetes.io/name: mychart
app.kubernetes.io/instance: release-name
app.kubernetes.io/version: "0.1.0"
app.kubernetes.io/managed-by: Helm
annotations:
isDemo: "true"
data:
FOO: "Bar"

Deployment Demo

一个通过 ​​kustomize​​​ 来生成一个 ​​Deployment​​​ 资源的 Demo,​​kustomization​​ 文件定义。

┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$cat kustomization.yaml
resources:
- deploy.yaml
configMapGenerator:
- name: example-configmap-liruilong
files:
- application.properties

┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$

生成的 YAML 资源文件

┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$kubectl kustomize ./
apiVersion: v1
data:
application.properties: |
sendSMS.maxAuthSendNumber=3
sendSMS.maxAuthNumber=3
sendSMS.validationCodeExpirationTime=300000
sendSMS.VerificationCodeLength=4
kind: ConfigMap
metadata:
name: example-configmap-liruilong-42d226k4h6
---
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: web
name: web
spec:
replicas: 3
selector:
matchLabels:
app: web
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: web
spec:
containers:
- image: nginx:1.14.2
name: nginx-web
ports:
- containerPort: 80
name: nginx-web
volumes:
- configMap:
name: example-configmap-liruilong-42d226k4h6
name: config
resources: {}
status: {}

通过 ​​helmify​​​ 生成对应的 ​​chart​​​ 包, ​​-v​​ 可以查看详细的生成信息。

┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$kubectl kustomize ./ | helmify -v nginx-web
INFO[0000] creating a chart ChartName=nginx-web Namespace=
INFO[0000] Skip creating Chart skeleton: Chart.yaml already exists.
INFO[0000] overwritten file=nginx-web/templates/example-configmap-liruilong-42d226k4h6.yaml
INFO[0000] overwritten file=nginx-web/templates/deployment.yaml
INFO[0000] overwritten file=nginx-web/values.yaml
┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$kubectl kustomize ./ | helmify -vv nginx-web
DEBU[0000] Start processing...
DEBU[0000] decoded ApiVersion=v1 Kind=ConfigMap Name=example-configmap-liruilong-42d226k4h6
DEBU[0000] decoded ApiVersion=apps/v1 Kind=Deployment Name=web
DEBU[0000] EOF received. Finishing input objects decoding.
INFO[0000] creating a chart ChartName=nginx-web Namespace=
DEBU[0000] processed ApiVersion=v1 Kind=ConfigMap Name=example-configmap-liruilong-42d226k4h6
DEBU[0000] processed ApiVersion=apps/v1 Kind=Deployment Name=web
INFO[0000] Skip creating Chart skeleton: Chart.yaml already exists.
DEBU[0000] writing a template into file=nginx-web/templates/example-configmap-liruilong-42d226k4h6.yaml
INFO[0000] overwritten file=nginx-web/templates/example-configmap-liruilong-42d226k4h6.yaml
DEBU[0000] writing a template into file=nginx-web/templates/deployment.yaml
INFO[0000] overwritten file=nginx-web/templates/deployment.yaml
INFO[0000] overwritten file=nginx-web/values.yaml

生成的 ​​helm​​​ ​​charts​​ 文件结构

┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$tree nginx-web/
nginx-web/
├── Chart.yaml
├── templates
│ ├── deployment.yaml
│ ├── example-configmap-liruilong-42d226k4h6.yaml
│ └── _helpers.tpl
└── values.yaml

1 directory, 5 files

可以通过下面的方式查看 chart 包的 YAML 文件信息

┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$helm template nginx-web/
---
# Source: nginx-web/templates/example-configmap-liruilong-42d226k4h6.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: release-name-nginx-web-example-configmap-liruilong-42d226k4h6
labels:
helm.sh/chart: nginx-web-0.1.0
app.kubernetes.io/name: nginx-web
app.kubernetes.io/instance: release-name
app.kubernetes.io/version: "0.1.0"
app.kubernetes.io/managed-by: Helm
data:
application.properties: |
sendSMS.maxAuthSendNumber="3"
sendSMS.maxAuthNumber="3"
sendSMS.validationCodeExpirationTime="300000"
sendSMS.VerificationCodeLength="4"
---
# Source: nginx-web/templates/deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: release-name-nginx-web-web
labels:
app: web
helm.sh/chart: nginx-web-0.1.0
app.kubernetes.io/name: nginx-web
app.kubernetes.io/instance: release-name
app.kubernetes.io/version: "0.1.0"
app.kubernetes.io/managed-by: Helm
spec:
replicas: 3
selector:
matchLabels:
app: web
app.kubernetes.io/name: nginx-web
app.kubernetes.io/instance: release-name
template:
metadata:
labels:
app: web
app.kubernetes.io/name: nginx-web
app.kubernetes.io/instance: release-name
spec:
containers:
- env:
- name: KUBERNETES_CLUSTER_DOMAIN
value: cluster.local
image: nginx:1.14.2
name: nginx-web
ports:
- containerPort: 80
name: nginx-web
resources: {}
volumes:
- configMap:
name: release-name-nginx-web-example-configmap-liruilong-42d226k4h6
name: config
┌──[root@vms81.liruilongs.github.io]-[~/kustomize]
└─$

博文参考

​​https://medium.com/geekculture/convert-kubernetes-yaml-files-into-helm-charts-4107de079455​​


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