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[Backport release-1.2] [virtual-machine] Exclude external VM services from Cilium BPF LB - #2361
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Add service.kubernetes.io/service-proxy-name label to LoadBalancer services when external: true. This prevents Cilium from adding the service to its BPF service map, fixing two issues: 1. Inter-tenant connectivity via public LB IPs: Cilium's kube-proxy replacement DNATs traffic to LB IPs before policy evaluation, causing the CiliumClusterwideNetworkPolicy to block legitimate cross-tenant traffic through public IPs. 2. WholeIP broken on Cilium 1.19+ (#2327): wildcard service drop entries block all ports not declared in the Service spec before traffic reaches cozy-proxy's nftables rules. With this label, Cilium completely ignores the Service. Routing is handled by kube-ovn (via the wholeIP annotation) and MetalLB continues to advertise the IP via L2 unaffected. Tested on Cilium 1.18.6 and 1.19.1: inter-tenant via LB IP works, pod IP isolation preserved, external access unaffected. Signed-off-by: mattia-eleuteri <[email protected]> (cherry picked from commit 026b1c7)
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requested review from
IvanHunters,
Andrey Kolkov (androndo),
Andrei Kvapil (kvaps),
Aleksei Sviridkin (lexfrei),
Timofei Larkin (lllamnyp) and
Kirill Ilin (sircthulhu)
as code owners
April 8, 2026 14:44
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Description
Backport of #2357 to
release-1.2.