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The k3s docker image doesn’t use

/var/lib/rancher/k3s/data

as it does not self-extract the binaries the same way that the k3s binary from github does. It wouldn’t make a lot of sense to ship a docker image that just unpacked a bunch of things into tempfs every time you ran it. In the k3s docker image, everything is already extracted to

/bin/

/ # ls -la /bin/flannel /bin/cni
-rwxr-xr-x 1 0 0 4165632 Sep 21 00:49 /bin/cni
lrwxrwxrwx 1 0 0       3 Sep 21 00:50 /bin/flannel -> cni
/ # flannel --version
CNI Plugin flannel version v0.22.2 (linux/amd64) commit HEAD built on 2023-09-21T00:49:54Z
CNI protocol versions supported: 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.4.0, 1.0.0