kubernetes - Insert multiline json string into helm template for base64 encoding

Kubernetes - Insert multiline json string into helm template for base64 encoding

To insert a multiline JSON string into a Helm template for base64 encoding, you can use a HEREDOC or a block scalar in YAML. Here's how you can do it:

  1. Using HEREDOC:
{{- $multilineJSON := trimSpaces ` { "key1": "value1", "key2": "value2", "key3": { "nested_key1": "nested_value1", "nested_key2": "nested_value2" } } ` -}} {{- $base64Encoded := $multilineJSON | b64enc -}} myEncodedData: {{ $base64Encoded }}

In this example, the trimSpaces function is used to remove leading and trailing whitespace from the multiline JSON string. Then, the b64enc function is used to encode the JSON string to base64.

  1. Using Block Scalar:
{{- define "multilineJSON" -}} | { "key1": "value1", "key2": "value2", "key3": { "nested_key1": "nested_value1", "nested_key2": "nested_value2" } } {{- end -}} {{- $multilineJSON := template "multilineJSON" . -}} {{- $base64Encoded := $multilineJSON | b64enc -}} myEncodedData: {{ $base64Encoded }}

In this approach, the multilineJSON template is defined as a block scalar using the | symbol. Then, the template is called with the template function, and the resulting string is base64 encoded.

Choose the approach that fits best with your Helm template structure and preferences. Both approaches will result in the multiline JSON string being base64 encoded within the Helm template.

Examples

  1. How to insert multiline JSON string into Helm template?

    Description: Steps to include a multiline JSON string in a Helm template.

    # values.yaml jsonString: | { "key1": "value1", "key2": "value2" } # templates/configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: example-config data: config.json: | {{ .Values.jsonString | indent 4 }}

  2. Base64 encoding a multiline JSON string in Helm template

    Description: How to base64 encode a multiline JSON string in a Helm template.

    # values.yaml jsonString: | { "key1": "value1", "key2": "value2" } # templates/secret.yaml apiVersion: v1 kind: Secret metadata: name: example-secret data: config.json: {{ .Values.jsonString | b64enc }}

  3. Handling multiline strings in Helm templates

    Description: Properly managing multiline strings within Helm templates to avoid formatting issues.

    # values.yaml multilineString: | line1 line2 line3 # templates/configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: example-config data: multiline.txt: | {{ .Values.multilineString | indent 4 }}

  4. Injecting JSON configuration into Kubernetes ConfigMap using Helm

    Description: Injecting a JSON configuration stored in values.yaml into a Kubernetes ConfigMap using Helm.

    # values.yaml jsonConfig: | { "setting1": "value1", "setting2": "value2" } # templates/configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: json-config data: config.json: | {{ .Values.jsonConfig | indent 4 }}

  5. Helm template: base64 encode JSON for Kubernetes Secret

    Description: Using Helm templates to base64 encode a JSON string for inclusion in a Kubernetes Secret.

    # values.yaml secretJson: | { "username": "admin", "password": "secret" } # templates/secret.yaml apiVersion: v1 kind: Secret metadata: name: json-secret data: config.json: {{ .Values.secretJson | b64enc }}

  6. Helm: Passing multiline JSON string as environment variable

    Description: How to pass a multiline JSON string as an environment variable using Helm templates.

    # values.yaml jsonEnv: | { "env1": "value1", "env2": "value2" } # templates/deployment.yaml apiVersion: apps/v1 kind: Deployment metadata: name: example-deployment spec: template: spec: containers: - name: example-container env: - name: JSON_ENV valueFrom: configMapKeyRef: name: json-config key: config.json # templates/configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: json-config data: config.json: | {{ .Values.jsonEnv | indent 4 }}

  7. Embedding multiline JSON string in Helm values file

    Description: Techniques to embed a multiline JSON string in the Helm values file and reference it in templates.

    # values.yaml multilineJson: | { "param1": "value1", "param2": "value2" } # templates/configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: multiline-json-config data: config.json: | {{ .Values.multilineJson | indent 4 }}

  8. Using Helm to base64 encode JSON data for Kubernetes Secrets

    Description: Creating a Kubernetes Secret with JSON data that is base64 encoded using Helm.

    # values.yaml credentialsJson: | { "apiKey": "12345", "apiSecret": "abcd" } # templates/secret.yaml apiVersion: v1 kind: Secret metadata: name: credentials-secret data: config.json: {{ .Values.credentialsJson | b64enc }}

  9. Referencing JSON strings in Helm templates

    Description: Referencing and processing JSON strings defined in Helm values file within Helm templates.

    # values.yaml jsonContent: | { "option1": "true", "option2": "false" } # templates/configmap.yaml apiVersion: v1 kind: ConfigMap metadata: name: json-content-config data: options.json: | {{ .Values.jsonContent | indent 4 }}

  10. Helm template function to base64 encode multiline JSON

    Description: Writing a custom Helm template function to base64 encode multiline JSON.

    # values.yaml customJson: | { "featureX": "enabled", "featureY": "disabled" } # templates/_helpers.tpl {{- define "b64encJson" -}} {{ . | b64enc }} {{- end -}} # templates/secret.yaml apiVersion: v1 kind: Secret metadata: name: custom-json-secret data: config.json: {{ include "b64encJson" .Values.customJson }}

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appendchild sensors apache-commons-httpclient robocup spring-boot-starter hamburger-menu dynamic uikit direct-labels jql

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