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Why kube-proxy add external-lb's address to node local iptables rule? #66607

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andrewsykim
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kind/bugCategorizes issue or PR as related to a bug.kind/cleanupCategorizes issue or PR as related to cleaning up code, process, or technical debt.kind/featureCategorizes issue or PR as related to a new feature.needs-triageIndicates an issue or PR lacks a `triage/foo` label and requires one.sig/networkCategorizes an issue or PR as relevant to SIG Network.
@BSWANG

Description

@BSWANG

/kind friction

What happened:
I have aLoadBalancer type service A of address 1.1.1.1. The external loadbalancer of service A is a TLS decoder, it will convert https requests to httphostport andendpoint. But since the kube-proxy add the external-lb's address to local iptables rule. Requests ofhttps//1.1.1.1 will hijack to local httpendpoints. Then https request failed.

What you expected to happen:
Kube-proxy don't add external-lb's address to local iptables. And the request will go through external-lb.

Environment:

  • Kubernetes version (usekubectl version):
    1.10.4
  • Cloud provider or hardware configuration:
    Alibaba Cloud
  • OS (e.g. from /etc/os-release):
    Centos 7.4
  • Kernel (e.g.uname -a):
    3.10.0-693
  • Install tools:
    kubeadm

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kind/bugCategorizes issue or PR as related to a bug.kind/cleanupCategorizes issue or PR as related to cleaning up code, process, or technical debt.kind/featureCategorizes issue or PR as related to a new feature.needs-triageIndicates an issue or PR lacks a `triage/foo` label and requires one.sig/networkCategorizes an issue or PR as relevant to SIG Network.

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