kubernetes : Service shared between multiple namespaces

Question

I'm searching for the answer but i didn't find it anywhere. Is it possible to share a service between multiple namespaces ?

For instance, if i have 2 namespaces (let's say 'qa' and 'dev'), is it possible to use the same database server ? The database server would be preferably managed by kubernetes too.

I've read this issue : https://github.com/openshift/origin/issues/1244 But it's not directly related to kubernetes.

Regards, Smana

Alex Robinson · Accepted Answer · 2015-09-21 08:29:20Z

13

Services are accessible from all namespaces as long as you address them using both the name and the namespace.

For example, if you have a service named db in namespace dev, you can access it using the DNS name db. While this won't work from qa, you can access it from both qa and dev if you instead use the DNS name db.dev (<service>.<namespace>), in order to clarify which namespace should be searched for the service.

answered Sep 21, 2015 at 8:29

Alex Robinson

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3 Comments

Smana Over a year ago

Thanks Alex, i'll try that

D-rk Over a year ago

for me that does not work. is there some reference in the docs about this?

Alex Robinson Over a year ago

It's likely that the cluster you're using has some security policies set up, such as network policies (kubernetes.io/docs/concepts/services-networking/…), that prevent the communication. Communicating across namespaces like this still works in plain vanilla clusters. If you have a cluster admin of some sort, I'd ask them what's up.

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