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Accepted
David Tinker
Asked: 2021-05-25 08:34:25 +0800 CST

Kubernetes how to expose a port on host node to pods?

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We are just getting started with k8s. One of the things we need to do is expose a service running on each bare metal Ubuntu 20.04 host node to pods in k8s. The service is listening on the node's real IP as well as localhost on port 8500. Is there an easy way to do this?

I can get to port 80 and 443 on the node from inside a pod using its IP but not to 8500.

kubernetes

1 Answers

  1. Best Answer

    As @David Tinker mentioned in the comments, problem is solved.

    connections from inside k8s pods on the same host would get blocked by our firewall rules.

    So, the solution is hidden in iptables:

    iptables -A INPUT -p tcp --dport 8500 -j ACCEPT
iptables -A INPUT -i cni0 -j ACCEPT
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