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 description: >
     Generate ConfigMap resources.
 ---
-
-Each entry in this list results in the creation of
-one ConfigMap resource (it's a generator of n maps).
-
-The example below creates four ConfigMaps:
-
-- first, with the names and contents of the given files
-- second, with key/value as data using key/value pairs from files
-- third, also with key/value as data, directly specified using `literals`
-- and a fourth, which sets an annotation and label via `options` for that single ConfigMap
-
-Each configMapGenerator item accepts a parameter of
-`behavior: [create|replace|merge]`.
-This allows an overlay to modify or
-replace an existing configMap from the parent.
-
-Also, each entry has an `options` field, that has the
-same subfields as the kustomization file's `generatorOptions` field.
-  
-This `options` field allows one to add labels and/or
-annotations to the generated instance, or to individually
-disable the name suffix hash for that instance.
-Labels and annotations added here will not be overwritten
-by the global options associated with the kustomization
-file `generatorOptions` field.  However, due to how
-booleans behave, if the global `generatorOptions` field
-specifies `disableNameSuffixHash: true`, this will
-trump any attempt to locally override it.
-
-```yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-# These labels are added to all configmaps and secrets.
-generatorOptions:
-  labels:
-    fruit: apple
-
-configMapGenerator:
-- name: my-java-server-props
-  behavior: merge
-  files:
-  - application.properties
-  - more.properties
-- name: my-java-server-env-file-vars
-  envs:
-  - my-server-env.properties
-  - more-server-props.env
-- name: my-java-server-env-vars
-  literals:
-  - JAVA_HOME=/opt/java/jdk
-  - JAVA_TOOL_OPTIONS=-agentlib:hprof
-  options:
-    disableNameSuffixHash: true
-    labels:
-      pet: dog
-- name: dashboards
-  files:
-  - mydashboard.json
-  options:
-    annotations:
-      dashboard: "1"
-    labels:
-      app.kubernetes.io/name: "app1"
-```
-
-It is also possible to
-[define a key](https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#define-the-key-to-use-when-creating-a-configmap-from-a-file)
-to set a name different than the filename.
-
-The example below creates a ConfigMap
-with the name of file as `myFileName.ini`
-while the _actual_ filename from which the
-configmap is created is `whatever.ini`.
-
-```yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-configMapGenerator:
-- name: app-whatever
-  files:
-  - myFileName.ini=whatever.ini
-```
-
-## ConfigMap `from File`
-
-ConfigMap Resources may be generated from files - such as a java `.properties` file.  To generate a ConfigMap
-Resource for a file, add an entry to `configMapGenerator` with the filename.
-
-**Example:** Generate a ConfigMap with a data item containing the contents of a file.
-
-The ConfigMaps will have data values populated from the file contents.  The contents of each file will
-appear as a single data item in the ConfigMap keyed by the filename.
-
-The example illustrates how you can create ConfigMaps from File using Generators.
-
-### File Input
-
-```yaml
-# kustomization.yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-configMapGenerator:
-- name: my-application-properties
-  files:
-  - application.properties
-
-```
-
-```yaml
-# application.properties
-FOO=Bar
-```
-
-### Build Output
-
-```yaml
-apiVersion: v1
-data:
-  application.properties: |-
-    FOO=Bar
-kind: ConfigMap
-metadata:
-  name: my-application-properties-f7mm6mhf59
-```
-
-## ConfigMap `from Literals`
-
-ConfigMap Resources may be generated from literal key-value pairs - such as `JAVA_HOME=/opt/java/jdk`.
-To generate a ConfigMap Resource from literal key-value pairs, add an entry to `configMapGenerator` with a
-list of `literals`.
-
-{{< alert color="success" title="Literal Syntax" >}}
-- The key/value are separated by a `=` sign (left side is the key)
-- The value of each literal will appear as a data item in the ConfigMap keyed by its key.
-{{< /alert >}}
-
-**Example:** Create a ConfigMap with 2 data items generated from literals.
-
-The example illustrates how you can create ConfigMaps from Literals using Generators.
-
-### File Input
-
-```yaml
-# kustomization.yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-configMapGenerator:
-- name: my-java-server-env-vars
-  literals:
-  - JAVA_HOME=/opt/java/jdk
-  - JAVA_TOOL_OPTIONS=-agentlib:hprof
-
-```
-
-### Build Output
-
-```yaml
-apiVersion: v1
-data:
-  JAVA_HOME: /opt/java/jdk
-  JAVA_TOOL_OPTIONS: -agentlib:hprof
-kind: ConfigMap
-metadata:
-  name: my-java-server-env-vars-44k658k8gk
-```
-
-## ConfigMap `from env file`
-
-ConfigMap Resources may be generated from key-value pairs much the same as using the literals option
-but taking the key-value pairs from an environment file. These generally end in `.env`.
-To generate a ConfigMap Resource from an environment file, add an entry to `configMapGenerator` with a
-single `envs` entry, e.g. `envs: [ 'config.env' ]`.
-
-{{< alert color="success" title="Environment File Syntax" >}}
-- The key/value pairs inside of the environment file are separated by a `=` sign (left side is the key)
-- The value of each line will appear as a data item in the ConfigMap keyed by its key.
-- Pairs may span a single line only.
-{{< /alert >}}
-
-**Example:** Create a ConfigMap with 3 data items generated from an environment file.
-
-### File Input
-
-```yaml
-# kustomization.yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-configMapGenerator:
-- name: tracing-options
-  envs:
-  - tracing.env
-```
-
-```bash
-# tracing.env
-ENABLE_TRACING=true
-SAMPLER_TYPE=probabilistic
-SAMPLER_PARAMETERS=0.1
-```
-
-### Build Output
-
-```yaml
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  # The name has had a suffix applied
-  name: tracing-options-6bh8gkdf7k
-# The data has been populated from each literal pair
-data:
-  ENABLE_TRACING: "true"
-  SAMPLER_TYPE: "probabilistic"
-  SAMPLER_PARAMETERS: "0.1"
-```
-
-## Overriding Base ConfigMap Values
-
-ConfigMap values from bases may be overridden by adding another generator for the ConfigMap
-in the overlay and specifying the `behavior` field.  `behavior` may be
-one of:
-* `create` (default value): used to create a new ConfigMap. A name conflict error will be thrown if a ConfigMap with the same name and namespace already exists.
-* `replace`: replace an existing ConfigMap from the base.
-* `merge`: add or update the values in an existing ConfigMap from the base.
-
-When updating an existing ConfigMap with the `merge` or `replace` strategies, you must ensure that both the name and namespace match the ConfigMap you're targeting. For example, if the namespace is unspecified in the base, you should not specify it in the overlay. Conversely, if it is specified in the base, you must specify it in the overlay as well. This is true even if the overlay Kustomization includes a namespace, because configMapGenerator runs before the namespace transformer.
-
-```yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-
-namespace: my-new-namespace
-
-resources:
-- ../base
-
-configMapGenerator:
-  - name: existing-name
-    namespace: existing-ns # needs to match target ConfigMap from base
-    behavior: replace
-    literals:
-      - ENV=dev
-```
-
-{{< alert color="warning" title="Name suffixing with overlay configMapGenerator" >}}
-When using configMapGenerator to override values of an existing ConfigMap, the overlay configMapGenerator does not cause suffixing of the existing ConfigMap's name to occur. To take advantage of name suffixing, use configMapGenerator in the base, and the overlay generator will correctly update the suffix based on the new content. 
-{{< /alert >}}
-
-## Propagating the Name Suffix
-
-Workloads that reference the ConfigMap or Secret will need to know the name of the generated Resource,
-including the suffix. Kustomize takes care of this automatically by identifying
-references to generated ConfigMaps and Secrets, and updating them.
-
-In the following example, the generated ConfigMap name will be `my-java-server-env-vars` with a suffix unique to its contents.
-Changes to the contents will change the name suffix, resulting in the creation of a new ConfigMap,
-which Kustomize will transform Workloads to point to.
-
-The PodTemplate volume references the ConfigMap by the name specified in the generator (excluding the suffix).
-Kustomize will update the name to include the suffix applied to the ConfigMap name.
-
-**Input:** The kustomization.yaml and deployment.yaml files
-
-```yaml
-# kustomization.yaml
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-configMapGenerator:
-- name: my-java-server-env-vars
-  literals:
-  - JAVA_HOME=/opt/java/jdk
-  - JAVA_TOOL_OPTIONS=-agentlib:hprof
-resources:
-- deployment.yaml
-```
-
-```yaml
-# deployment.yaml
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: test-deployment
-  labels:
-    app: test
-spec:
-  selector:
-    matchLabels:
-      app: test
-  template:
-    metadata:
-      labels:
-        app: test
-    spec:
-      containers:
-      - name: container
-        image: registry.k8s.io/busybox
-        command: [ "/bin/sh", "-c", "ls /etc/config/" ]
-        volumeMounts:
-        - name: config-volume
-          mountPath: /etc/config
-      volumes:
-      - name: config-volume
-        configMap:
-          name: my-java-server-env-vars
-```
-
-**Result:** The output of the Kustomize build.
-
-```yaml
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  # The name has been updated to include the suffix
-  name: my-java-server-env-vars-k44mhd6h5f
-data:
-  JAVA_HOME: /opt/java/jdk
-  JAVA_TOOL_OPTIONS: -agentlib:hprof
----
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  labels:
-    app: test
-  name: test-deployment
-spec:
-  selector:
-    matchLabels:
-      app: test
-  template:
-    metadata:
-      labels:
-        app: test
-    spec:
-      containers:
-      - command:
-        - /bin/sh
-        - -c
-        - ls /etc/config/
-        image: registry.k8s.io/busybox
-        name: container
-        volumeMounts:
-        - mountPath: /etc/config
-          name: config-volume
-      volumes:
-      - configMap:
-          # The name has been updated to include the
-          # suffix matching the ConfigMap
-          name: my-java-server-env-vars-k44mhd6h5f
-        name: config-volume
-```