Using environment variables in kong.yml

[Jason Motylinski]

Hello - 

I'm attempting to set up kong on Google's Container Engine, Kubernetes. One thing which Kubernetes doesn't seem to support is linking between Docker containers. 

Kubernetes has a concept of "Services" which are a way of encapsulating many instances of a container under a pseudo load balancer. To reference services in an other container (ilke Kong needing Cassandra) Kubernetes sets environment variables. For instance, the Kong container has an environment variable called "CASSANDRA_SERVICE_HOST" which has the IP address of the Cassandra container.

Is there a way to use an environment variable at runtime in the kong.yml file?

For reference, this is how Kubernetes suggests discovering services:

https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/services.md#discovering-services

Thanks,

Jason

[Thibault Charbonnier]

Hi jason,

There is no way to pass environment variables at runtime to kong.yml but what I can suggest you is to replace the value in kong.yml when starting your container, before starting Kong:

sed -ie "s/hosts: \"localhost\"/hosts: $CASSANDRA_SERVICE_HOST/" kong.yml

How does that sound? It should solve your problem.

[y...@yunspace.com]

Hi, just an FYI I've created a fork which supports certain Postgres and Cassandra environment variables: https://github.com/LittleBayDigital/docker-kong-service 

Hope this helps until a official solution is out.

[Marco]

Starting from 0.9 all the configuration properties can be overwritten with environment variables.

 Marco Palladino | CTO @ Mashape | mashape.com | +1 (415) 361-3858

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