At what point does oc env MONGODB_SERVICE_HOST get populated?

[alberttwong]

I have a question. The code knows to pull the correct IP for mongodb using $MONGODB_SERVICE_HOST. When does this variable get created and populated? When "oc new-app mongodb" get executed? If so, I tried to do a search across this project (returned 0 results) and couldn't find the spot that defines it.

[thoraxe]

This is related to the fact that this app is somewhat designed for use with OpenShift.

MONGODB_SERVICE_HOST is an environment variable injected by Kubernetes/OpenShift as part of the Kubernetes service subsystem.

Until a service called "mongodb" exists in the project, this variable will have no value. Once a service called "mongodb" exists in the project, any time a pod is spun up it will have this value injected. Note that there is a limitation in Docker in that environment variables cannot be injected into a running process, which is why an existing instance of this app would not suddenly know about MONGODB_SERVICE_HOST until the pod was restarted.