A. HelmChart Template
Prerequirements
### Linux ###
$ curl -fsSL -o get_helm.sh <https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3>
$ chmod 700 get_helm.sh
$ ./get_helm.sh
### MacOS ###
$ brew install helm
$ wget https://github.com/roboll/helmfile/releases/download/v0.139.7/helmfile_linux_amd64
$ chmod +x helmfile_linux_amd64
$ sudo mv helmfile_linux_amd64 /usr/local/bin/helmfile
$ helm plugin install https://github.com/databus23/helm-diff
$ helm plugin install https://github.com/hypnoglow/helm-s3.git
- Added Mandatory Repository
$ helm repo add stable https://charts.helm.sh/stable
$ helm repo update
Helm Repository
$ helm repo list
----
NAME URL
stable https://charts.helm.sh/stable
### LAB ###
AWS_REGION=ap-southeast-1 helm repo add devopscorner-lab s3://devopscorner-charts/lab
### STAGING ###
AWS_REGION=ap-southeast-1 helm repo add devopscorner-staging s3://devopscorner-charts/staging
### PRODUCTION ###
AWS_REGION=ap-southeast-1 helm repo add devopscorner s3://devopscorner-charts/prod
helm repo update
Creating HelmChart Template
$ helm create [helmchart_name]
---
eg:
$ helm create myhelm
$ tree myhelm
myhelm
├── Chart.yaml
├── charts
├── templates
│ ├── NOTES.txt
│ ├── _helpers.tpl
│ ├── deployment.yaml
│ ├── hpa.yaml
│ ├── ingress.yaml
│ ├── service.yaml
│ ├── serviceaccount.yaml
│ └── tests
│ └── test-connection.yaml
└── values.yaml
3 directories, 10 files
Structure HelmChart Template (Multi Environment)
.
├── template
│ ├── lab
│ │ ├── api
│ │ │ ├── Chart.yaml
│ │ │ ├── api.yaml
│ │ │ ├── templates
│ │ │ │ ├── _helpers.tpl
│ │ │ │ └── serviceaccount.yaml
│ │ │ └── values.yaml
│ │ ├── backend
│ │ │ ├── Chart.yaml
│ │ │ ├── backend.yaml
│ │ │ ├── templates
│ │ │ │ ├── _helpers.tpl
│ │ │ │ └── serviceaccount.yaml
│ │ │ └── values.yaml
│ │ ├── frontend
│ │ │ ├── Chart.yaml
│ │ │ ├── frontend.yaml
│ │ │ ├── templates
│ │ │ │ ├── _helpers.tpl
│ │ │ │ └── serviceaccount.yaml
│ │ │ └── values.yaml
│ │ └── svcrole
│ │ ├── Chart.yaml
│ │ ├── templates
│ │ │ ├── _helpers.tpl
│ │ │ ├── clusterrole.yaml
│ │ │ ├── rolebinding.yaml
│ │ │ └── serviceaccount.yaml
│ │ └── values.yaml
... ... ...
│ ├── [environment]
│ │ ├── api
│ │ │ └── values.yaml
│ │ ├── backend
│ │ │ └── values.yaml
│ │ ├── frontend
│ │ │ └── values.yaml
│ │ └── svcrole
│ │ └── values.yaml
└── test
├── lab
│ ├── helmfile.yaml
│ └── values
│ ├── api
│ │ └── api.yaml
│ ├── backend
│ │ └── backend.yaml
│ ├── frontend
│ │ └── frontend.yaml
│ └── svcrole
│ ├── account.yaml
│ ├── api.yaml
│ ├── backend.yaml
│ └── frontend.yaml
└── staging
├── helmfile.yaml
└── values
├── api
│ └── api.yaml
├── backend
│ └── backend.yaml
├── frontend
│ └── frontend.yaml
└── svcrole
├── account.yaml
├── api.yaml
├── backend.yaml
└── frontend.yaml
HelmChart In Repository
- Structure on services repository
_infra/
dev/
helmfile.yaml
values/
api/values.yaml
backend/values.yaml
svcrole/values.yaml
frontend/values.yaml
Testing Helm
- Testing the Chart Template
helm template ./api -f values/api/values.yaml
helm template ./backend -f values/backend/values.yaml
helm template ./svcrole -f values/svcrole/values.yaml
helm template ./frontend -f values/frontend/values.yaml
Packing HelmChart
- Create zip Packate of HelmChart
helm package api
helm package backend
helm package svcrole
helm package frontend
Update HelmChart Template
- Push chart into private repository
### LAB ###
helm s3 push api-[version].tgz devopscorner-lab --force
helm s3 push backend-[version].tgz devopscorner-lab --force
helm s3 push frontend-[version].tgz devopscorner-lab --force
helm s3 push svcrole-[version].tgz devopscorner-lab --force
---
### STAGING ###
helm s3 push api-[version].tgz devopscorner-staging --force
helm s3 push backend-[version].tgz devopscorner-staging --force
helm s3 push frontend-[version].tgz devopscorner-staging --force
helm s3 push svcrole-[version].tgz devopscorner-staging --force
---
### PRODUCTION ###
helm s3 push api-[version].tgz devopscorner --force
helm s3 push backend-[version].tgz devopscorner --force
helm s3 push frontend-[version].tgz devopscorner --force
helm s3 push svcrole-[version].tgz devopscorner --force
B. Versioning HelmChart
# 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: "1.1.0-rc"
- Repacking HelmChart template
- Repush HelmChart into private repository
C. Using Versioning HelmChart in helmfile.yaml
---
repositories:
- name: devopscorner-lab
url: s3://devopscorner-charts/lab
templates:
default: &default
namespace: devopscorner
version: "1.0.0-rc"
releases:
- name: devopscorner-api
chart: devopscorner-lab/api
values:
- ./values/api/values.yaml
<<: *default
- name: devopscorner-backend
chart: devopscorner-lab/backend
values:
- ./values/backend/values.yaml
<<: *default
- name: devopscorner-frontend
chart: devopscorner-lab/frontend
values:
- ./values/frontend/values.yaml
<<: *default
- name: devopscorner-svcaccount
chart: devopscorner-lab/svcrole
values:
- ./values/svcrole/account.yaml
<<: *default
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