Automating MongoDB Replica set configuration on Kubernetes

mongodb kubernetes replicaset

This might be what you're looking for:

mongodb kubernetes replicaset

Yes, it is possible, you have several choices:

Use the sidecar approach as specified by @tzik, then you don't need to do much in your code
Use the kubernetes lifecycle.postInstall feature to implement the clustering on your own (this is a bit tricky, because postInstall runs on each statefulset member)
Use if you decide to use helm to manage your k8s deployments, then you can use helm post-install hooks to initiate your mongodb cluster.

CodeHunter