networkd: prevent networkd interference with cilium_vxlan interface #43
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jepio
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Jul 29, 2021
Cilium's cilium_vxlan interface was getting the default networkd setup applied which tries to attach an IP address through DHCP. This meant that the interface was stuck in this "configuring" state by networkd and now since somewhere between systemd 247.3 and 247.6 this also causes a disruption, reported in flatcar/Flatcar#455 Set the cilium_vxlan interface, and any other Cilium interfaces, to be not managed by networkd's default setup with DHCP as it's managed by Cilium.
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Cilium's cilium_vxlan interface was getting the default networkd setup
applied which tries to attach an IP address through DHCP. This meant
that the interface was stuck in this "configuring" state by networkd
and now since somewhere between systemd 247.3 and 247.6 this also
causes a disruption, reported in
flatcar/Flatcar#455
Set the cilium_vxlan interface to be not managed by networkd's default
setup with DHCP as it's managed by Cilium.
How to use
To verify, check
networkctloutput to havecilium_vxlanto beunmanagedinstead ofconfiguring. Also check that it fixes the mentioned issue with Stable 2905.2.0Testing done
Manually added the file to
/etc/systemd/network/and verified that it fixed the reproducer and the kubeadm.cilium.base test and ran a full test http://localhost:9091/job/os/job/manifest/3158/cldsv/ for the commit here