The environment variables are used to make parameters available to different kubernetes objects.

We could use environment variables in a YAML file for example as below:


We set the environment variables at the container level.
We could use them for example in the YAML file, on a command in the container:


We could also pass them through the deployment on the command line using the below commands.
We first, create our deployment:


Then we set our environment variables:

 
Remark:

Using configMaps to store environment variables for example, gives us more flexibility than hard-coding them inside the containers
We don't have to create different versions of the same pod, we just create different configMaps and attach them to our copies of the pod
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