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feat: generated Helm documentation (#335)
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,11 @@ | ||
| repos: | ||
| - repo: https://github.com/norwoodj/helm-docs | ||
| rev: v1.14.2 | ||
| hooks: | ||
| - id: helm-docs-built | ||
| args: | ||
| - --chart-search-root=. | ||
| - --values-file=values.yaml | ||
| - --output-file=./../README.md | ||
| - --template-files=./README.md.gotmpl | ||
| - --sort-values-order=file |
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| @@ -1,6 +1,14 @@ | ||
| SHELL := /bin/bash | ||
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| VERSION ?= 0.0.1 | ||
| install-hooks: | ||
| command -v pre-commit 2>&1 >/dev/null || pip install pre-commit | ||
| pre-commit install | ||
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| bump-chart: | ||
| sed -i "s/^version:.*/version: $(VERSION)/" application/Chart.yaml | ||
| @test -n "$(VERSION)" || (echo "VERSION environment variable is not set"; exit 1) | ||
| sed -i 's/^version: [0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\}/version: $(VERSION)/' application/Chart.yaml | ||
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| build-docs: install-hooks | ||
| # Running helm-docs-built twice to ensure that the generated docs are up-to-date | ||
| pre-commit run helm-docs-built --all-files || true | ||
| pre-commit run helm-docs-built --all-files |
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| [](https://opensource.org/licenses/MIT) | ||
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| # Application | ||
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| Generic helm chart for applications which: | ||
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| - are stateless | ||
| - creates only namespace scoped resources (e.g. it doesn't need CRB - Cluster Role Bindings) | ||
| - don't need privileged containers | ||
| - don't call the underlying Kubernetes API or use the underlying etcd as a database by defining custom resources | ||
| - run either as deployment, job or cronjob | ||
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| ## Installing the Chart | ||
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| To install the chart with the release name `my-application` in namespace `test`: | ||
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| ```shell | ||
| helm repo add stakater https://stakater.github.io/stakater-charts | ||
| helm repo update | ||
| helm install my-application stakater/application --namespace test | ||
| ``` | ||
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| ## Uninstall the Chart | ||
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| To uninstall the chart: | ||
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| ```shell | ||
| helm delete --namespace test my-application | ||
| ``` | ||
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| {{ template "chart.valuesSection" . }} | ||
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| {{ template "helm-docs.versionFooter" . }} | ||
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| ## Naming convention for ConfigMap, Secret, SealedSecret and ExternalSecret | ||
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| Name format of ConfigMap, Secret, SealedSecret and ExternalSecret is `{{`{{ template "application.name" $ }}-{{ $nameSuffix }}`}}` then: | ||
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| - `{{`{{ template "application.name" }}`}}` is a helper function that outputs `.Values.applicationName` if exist else return chart name as output | ||
| - `nameSuffix` is the each key in `secret.files`, `configMap.files`, `sealedSecret.files` and `externalSecret.files` | ||
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| For example if we have following values file: | ||
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| ```yaml | ||
| applicationName: helloworld # {{`{{ template "application.name" $ }}`}} | ||
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| configMap: | ||
| files: | ||
| config: # {{`{{ $nameSuffix }}`}} | ||
| key: value | ||
| ``` | ||
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| then the configmap name will be named `helloworld-config`. | ||
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| ## Consuming environment variable in application chart | ||
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| In order to use environment variable in deployment or cronjob, you will have to provide environment variable in *key/value* pair in `env` value. where key being environment variable key and value varies in different scenarios | ||
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| - For simple key/value environment variable, just provide `value: <value>` | ||
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| ```yaml | ||
| env: | ||
| KEY: | ||
| value: MY_VALUE | ||
| ``` | ||
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| - To get environement variable value from **ConfigMap** | ||
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| Suppose we have a configmap created from application chart | ||
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| ```yaml | ||
| applicationName: my-application | ||
| configMap: | ||
| enabled: true | ||
| files: | ||
| application-config: | ||
| LOG: DEBUG | ||
| VERBOSE: v1 | ||
| ``` | ||
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| To get environment variable value from above created configmap, we will need to add following | ||
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| ```yaml | ||
| env: | ||
| APP_LOG_LEVEL: | ||
| valueFrom: | ||
| configMapKeyRef: | ||
| name: my-application-appication-config | ||
| key: LOG | ||
| ``` | ||
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| To get all environment variables key/values from **ConfigMap**, where configmap key being key of environment variable and value being value | ||
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| ```yaml | ||
| envFrom: | ||
| application-config-env: | ||
| type: configmap | ||
| nameSuffix: application-config | ||
| ``` | ||
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| You can either provide `nameSuffix` which means name added after prefix `<applicationName>-` or static name with `name` of configmap. | ||
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| - To get environment variable value from **Secret** | ||
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| Suppose we have secret created from application chart | ||
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| ```yaml | ||
| applicationName: my-application | ||
| secret: | ||
| enabled: true | ||
| files: | ||
| db-credentials: | ||
| PASSWORD: skljd#2Qer!! | ||
| USER: postgres | ||
| ``` | ||
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| To get environment variable value from above created secret, we will need to add following | ||
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| ```yaml | ||
| env: | ||
| KEY: | ||
| valueFrom: | ||
| secretKeyRef: | ||
| name: my-application-db-credentials | ||
| key: USER | ||
| ``` | ||
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| To get environement variable value from **Secret**, where secret key being key of environment variable and value being value | ||
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| ```yaml | ||
| envFrom: | ||
| database-credentials: | ||
| type: secret | ||
| nameSuffix: db-credentials | ||
| ``` | ||
| you can either provide `nameSuffix` which means name added after prefix `<applicationName>-` or static name with `name` of secret | ||
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| **Note:** first key after `envFrom` is just used to uniquely identify different objects in `envFrom` block. Make sure to keep it unique and relevant | ||
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| ## Configuring probes | ||
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| To disable liveness or readiness probe, set value of `enabled` to `false`. | ||
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| ```yaml | ||
| livenessProbe: | ||
| enabled: false | ||
| ``` | ||
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| By default probe handler type is `httpGet`. You just need to override `port` and `path` as per your need. | ||
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| ```yaml | ||
| livenessProbe: | ||
| enabled: true | ||
| httpGet: | ||
| path: '/path' | ||
| port: 8080 | ||
| ``` | ||
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| In order to use `exec` handler, you can define field `livenessProbe.exec` in your values.yaml. | ||
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| ```yaml | ||
| livenessProbe: | ||
| enabled: true | ||
| exec: | ||
| command: | ||
| - cat | ||
| - /tmp/healthy | ||
| ``` |
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