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How to see what is using flannel or circumvent flannel address usage in kubernetes? (lemmy.zip)

submitted 5 days ago* (last edited 2 days ago) by [email protected] to c/[email protected]

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[EDIT (solved)]: Turns out, cilium did not remove its network links, and somehow kept updating to my current CIDIR leading to a duplicate, removing the links worked.

I keep on getting issues with CNI and networking.. I just want my cluster to work.. anyways

Apr 28 17:14:30 raspberrypi k3s[2373903]: time="2025-04-28T17:14:30+12:00" level=error msg="flannel exited: failed to register flannel network: failed to configure interface flannel.1: failed to set interface flannel.1 to UP state: address already in use"

How do i see what is using flannel Here is my server arguments:

ExecStart=/usr/local/bin/k3s \
    server \
        --kubelet-arg=allowed-unsafe-sysctls=net.core.rmem_max,net.core.wmem_max,net.ipv4.ip_forward \
        --flannel-backend vxlan \
        --disable=traefik \
        --write-kubeconfig-mode 644

So I am using the default flannel backend, I tried repeatedly uninstalling then re-installing k3s, I deleted the current flannel interface with ip link, there is no other k3s instance is running, so why am I getting this issue?

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[–] [email protected] 1 points 4 days ago* (last edited 4 days ago) (1 children)

The Rancher or Kubernetes slack servers might be the best place to target your questions. It's more interactive, which would probably be more effective than posting Qs all over the Internet.

[–] [email protected] 1 points 4 days ago

I'll go there, i don't constantly post questions but I've just been recently having alot of issues with CNI's, I might just delete this post