71 What is Kubernetes ConfigMap? | How to Create ConfigMap? | How to Use ConfigMap in Pod?
Kubernetes Rolling Update Strategy.
What is Kubernetes ConfigMap? How to Create ConfigMap? How to Use ConfigMap in Pod?
Kubernetes ConfigMap is a resource that allows you to store configuration data separately from your application's code. It provides a way to decouple configuration details from the application, making it easier to manage and update configurations without modifying the application itself.
Creating a ConfigMap:
Identify the configuration data you want to store, such as environment variables, configuration files, or key-value pairs.
Create a Kubernetes manifest file in YAML format or use the kubectl command-line tool.
In the manifest file, define the ConfigMap's metadata, including its name.
Specify the configuration data in the data section of the manifest file, with keys and their corresponding values.
Using a ConfigMap in a Pod:
Decide which Pod you want to use the ConfigMap with.
In the Pod's YAML manifest, add a volumes section to define the volume.
Specify a unique name for the volume.
Within the volumes section, indicate the type of volume, such as configMap.
Specify the name of the ConfigMap you want to use as the name.
In the same Pod's manifest, within the containers section, add an env or envFrom section to define environment variables sourced from the ConfigMap.
For each environment variable, specify the variable's name and the corresponding key in the ConfigMap data.
By following these steps, you can create a ConfigMap by defining its metadata and providing the desired configuration data. Then, you can use the ConfigMap in a Pod by referencing its name and specifying how the configuration data should be used, such as setting environment variables within the container. This separation of configuration data in a ConfigMap helps maintain a clear distinction between application code and its associated configurations.
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