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Bitnami Common Library Chart

A Helm Library Chart for grouping common logic between Bitnami charts.

TL;DR

dependencies:
  - name: common
    version: 2.x.x
    repository: oci://registry-1.docker.io/bitnamicharts

helm dependency update

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ include "common.names.fullname" . }}
data:
  myvalue: "Hello World"

Looking to use our applications in production? Try VMware Tanzu Application Catalog, the commercial edition of the Bitnami catalog.

Introduction

This chart provides a common template helpers which can be used to develop new charts using Helm package manager.

Bitnami charts can be used with Kubeapps for deployment and management of Helm Charts in clusters.

Prerequisites

Kubernetes 1.23+
Helm 3.8.0+

Parameters

Special input schemas

ImageRoot

registry:
  type: string
  description: Docker registry where the image is located
  example: docker.io

repository:
  type: string
  description: Repository and image name
  example: bitnami/nginx

tag:
  type: string
  description: image tag
  example: 1.16.1-debian-10-r63

pullPolicy:
  type: string
  description: Specify a imagePullPolicy. Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'

pullSecrets:
  type: array
  items:
    type: string
  description: Optionally specify an array of imagePullSecrets (evaluated as templates).

debug:
  type: boolean
  description: Set to true if you would like to see extra information on logs
  example: false

## An instance would be:
# registry: docker.io
# repository: bitnami/nginx
# tag: 1.16.1-debian-10-r63
# pullPolicy: IfNotPresent
# debug: false

Persistence

enabled:
  type: boolean
  description: Whether enable persistence.
  example: true

storageClass:
  type: string
  description: Ghost data Persistent Volume Storage Class, If set to "-", storageClassName: "" which disables dynamic provisioning.
  example: "-"

accessMode:
  type: string
  description: Access mode for the Persistent Volume Storage.
  example: ReadWriteOnce

size:
  type: string
  description: Size the Persistent Volume Storage.
  example: 8Gi

path:
  type: string
  description: Path to be persisted.
  example: /bitnami

## An instance would be:
# enabled: true
# storageClass: "-"
# accessMode: ReadWriteOnce
# size: 8Gi
# path: /bitnami

ExistingSecret

name:
  type: string
  description: Name of the existing secret.
  example: mySecret
keyMapping:
  description: Mapping between the expected key name and the name of the key in the existing secret.
  type: object

## An instance would be:
# name: mySecret
# keyMapping:
#   password: myPasswordKey

Example of use

When we store sensitive data for a deployment in a secret, some times we want to give to users the possibility of using theirs existing secrets.

# templates/secret.yaml
---
apiVersion: v1
kind: Secret
metadata:
  name: {{ include "common.names.fullname" . }}
  labels:
    app: {{ include "common.names.fullname" . }}
type: Opaque
data:
  password: {{ .Values.password | b64enc | quote }}

# templates/dpl.yaml
---
...
      env:
        - name: PASSWORD
          valueFrom:
            secretKeyRef:
              name: {{ include "common.secrets.name" (dict "existingSecret" .Values.existingSecret "context" $) }}
              key: {{ include "common.secrets.key" (dict "existingSecret" .Values.existingSecret "key" "password") }}
...

# values.yaml
---
name: mySecret
keyMapping:
  password: myPasswordKey

ValidateValue

NOTES.txt

{{- $validateValueConf00 := (dict "valueKey" "path.to.value00" "secret" "secretName" "field" "password-00") -}}
{{- $validateValueConf01 := (dict "valueKey" "path.to.value01" "secret" "secretName" "field" "password-01") -}}

{{ include "common.validations.values.multiple.empty" (dict "required" (list $validateValueConf00 $validateValueConf01) "context" $) }}

If we force those values to be empty we will see some alerts

helm install test mychart --set path.to.value00="",path.to.value01=""
    'path.to.value00' must not be empty, please add '--set path.to.value00=$PASSWORD_00' to the command. To get the current value:

        export PASSWORD_00=$(kubectl get secret --namespace default secretName -o jsonpath="{.data.password-00}" | base64 -d)

    'path.to.value01' must not be empty, please add '--set path.to.value01=$PASSWORD_01' to the command. To get the current value:

        export PASSWORD_01=$(kubectl get secret --namespace default secretName -o jsonpath="{.data.password-01}" | base64 -d)

Upgrading

To 1.0.0

On November 13, 2020, Helm v2 support was formally finished, this major version is the result of the required changes applied to the Helm Chart to be able to incorporate the different features added in Helm v3 and to be consistent with the Helm project itself regarding the Helm v2 EOL.

What changes were introduced in this major version?

Previous versions of this Helm Chart use apiVersion: v1 (installable by both Helm 2 and 3), this Helm Chart was updated to apiVersion: v2 (installable by Helm 3 only). Here you can find more information about the apiVersion field.
Use type: library. Here you can find more information.
The different fields present in the Chart.yaml file has been ordered alphabetically in a homogeneous way for all the Bitnami Helm Charts

Considerations when upgrading to this version

If you want to upgrade to this version from a previous one installed with Helm v3, you shouldn't face any issues
If you want to upgrade to this version using Helm v2, this scenario is not supported as this version doesn't support Helm v2 anymore
If you installed the previous version with Helm v2 and wants to upgrade to this version with Helm v3, please refer to the official Helm documentation about migrating from Helm v2 to v3

Useful links

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

README.md