UDP routing or fixed ip in manadged k8s


I want to run OpenVPN on my managed cluster. OpenVPN uses UDP, and this generates some problems. First of all, I can’t use the DO load balancer (it only relays TCP/HTTP). Secondly for some reason DO floating IP seems to not work with UDP either.

My first idea was simply to get a floating IP, point it to one of the nodes, and everything will be ok (maybe I could write up a small automation script to auto reassign that IP on the node-pool). I could connect to the droplet IP, but can not connect to the floating IP. But I could ssh to both.

Right now, I simply pointed my domain to one of the worker’s IP, and started a VPN server on all of the nodes, with binding the node’s port. It “works” now, but if the droplets are added/removed to the cluster and I get unlucky I need to reassign the domain to one of the new IPs. Also somehow my home router needs a manual reconnect after an IP change which is really unfortunate.

I’m open to any elegant solution :)

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Hey @tg44,

At present LoadBalancer provided by the DigitalOcean does not support UDP protocol. So, if you need a LoadBalancer for your UDP-based application then it will not serve the purpose.

Also, nodes will be recycled and their IP address will not be persisted making it not ideal for a nodeport service either.

Product team always look for such feature request and product feedback, I request you to vote/add on the idea here and subscribe for updates:  This page to help gauge demand for new features, so adding it, or adding your vote, will help us to prioritize when we can implement this feature. Your patience and understanding in this regard will be highly appreciated.

Best Regards, Purnima Kumari Developer Support Engineer II- DigitalOcean

Sorry, this could be a dead-end but I feel like I saw something relevant when I was setting up a local Raspberry Pi Kubernetes cluster. I used Ubuntu and MicroK8s:

Specifically, you might be able follow the microk8s approach as a template to manually set up a load balancer on your DO cluster nodes.

I hope that helps, let us know if you find a definitive solution!