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wireless_purposely832 @ wireless_purposely832 @lemmy.world
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11 mo. ago

Multiple Kubernetes Services Using Same Port Without SNI

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  • I am unsure if I understood everything correctly, but I believe I am already doing everything that you mentioned. I followed the Kube-VIP's ARP daemonset's documentation. The leader election works. I am not using Kube-VIP for load balancing though. Instead, I am using Traefik, which is using the same IP address that was assigned to the control plane during both k3s's and Kube-VIP's setup. However, I am unable to get any additional VIP addresses to properly route to Traefik.

    Even if I did get the additional VIP addresses working, I think I still have one last issue to overcome. I can control the local network's DNS so that service#1 is assigned VIP#1 and service#2 assigned VIP#2. However, how would this be handled for traffic received externally? If the external/public DNS has service#1 and service#2 assigned to the network's public IP address, both service's traffic would be received by the router/firewall on port 22. The router/firewall could forward traffic on port 22 to (presumably) a single IP address, which would only allow service#1 or service#2 (but not both) to receive traffic publicly, correct?

    • Multiple Kubernetes Services Using Same Port Without SNI

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  • I think I can avoid using metallb since I'm already using Kube-VIP.

    I do not think that I am using Virtual IPs correctly as I tried setting it up, but it did not work. I assume the Virtual IP would just become the Load Balancer IP and I would need to configure Traefik and Kube-VIP (as well as my network) to use the Virtual IPs?

    • Multiple Kubernetes Services Using Same Port Without SNI

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  • I guess I need to dig in a little deeper. I am currently only using Kube-VIP to provide a single IP address for the control plane. I think I may have it configured wrong though since that same IP address is the single load balancer IP used by Traefik.

    I have struggled finding good documentation, hints, tutorials, etc. setting up Kube-VIP with Virtual IPs. Is there anything that you are aware of that might provide some assistant in setting that up correctly?

    • Multiple Kubernetes Services Using Same Port Without SNI

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  • Thanks - I appreciate the response. However, for the services I'm asking about (eg: SSH, SFTP, etc.) do not support SSL/TLS and forcing SSL/TLS with a wrapper would likely cause incompatibility with clients.

    I agree though - for other the services connecting via HTTP/HTTPS, there would likely either be some incompatibility or at least warning messages about not using SSL/TLS.