I am using v1beta2 of kubernetes and I have Deployment kind of configuration. In this configuration, I have a base conf of my app and I want to add conditionally a second docker image (container) in the same pod.

My config file :

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: ${MY_APP_NAME}
spec:
   containers:
    - name: my_first_container
      image: image_url
[...]
    - name: my_second_container <------ I want to put conditional declaration of this container
[...]

I don't want to add the second container in a spearate pod.

The condition is based on a variable like ${K8S_CONTAINER2_CONDITION} valued by sed command in linux. This command replace variables like ${MY_APP_NAME}.

How can I put conditional declaration of this container ? For some applications, I need to deploy both containers and for others, only the first one. But I have only one k8s configuration file (yaml).