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dockernetwork-programmingkuberneteskubectldocker-desktop

Enabling Kubernetes on Docker Desktop breaks access to external service

I'm using docker desktop for mac.

I have built a docker image for a Node.js app that connects to an external MongoDB database via URI (the db is running on an AWS instance that I'm connected to over vpn). This works fine - I run the container and the app can connect to the database. Happy days.

Then...

I enable Kubernetes on docker desktop. I apply a deployment.yml to run the container but this deployment fails when trying to connect to the db. From my app's logs (I'm using mongoose):

MongooseServerSelectionError: connect EHOSTUNREACH [MY DB IP] +30005ms

Interestingly...

I can now no longer connect to the db by running my docker container either. I get the same error.

I have to disable kubernetes, restart docker desktop (twice), prune my previous container and network, and re-run my container. Then it will work again.

As soon as I enable kubernetes again, the db becomes unreachable again.

Any ideas why this is and/or how to fix it?

Solution

  • So the issue for us turned out to be an IP range clash. Exactly the same as described in this SO question:

    Change Kubernetes docker-for-desktop cluster network ip

    Unfortunately, like this user, we haven't been able to find a solution