kindbox in Ubuntu 20.04 on btrfs - Kubelet fatal error during startup
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Since Sep 13, 2021.
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Description
Attempting to use kindbox on top of Ubuntu 20.04 running a btrfs file system produces the following fatal error in the logs during the Kubelet startup process, resulting in an inability to successfully launch the cluster.
Sep 08 23:44:54 k8s-control-plane kubelet[13550]: W0908 23:44:54.468225 13550 fs.go:565] stat failed on /dev/sda5 with error: no such file or directory
Sep 08 23:44:54 k8s-control-plane kubelet[13550]: F0908 23:44:54.468257 13550 kubelet.go:1350] Failed to start ContainerManager failed to get rootfs info: failed to get device for dir "/var/lib/kubelet": could not find device with major: 0, minor: 51 in cached partitions map
cat /proc/mounts | grep /var/lib/kubelet
/dev/sda5 /var/lib/kubelet btrfs rw,noatime,compress-force=zstd:3,ssd,space_cache,subvolid=5,subvol=/ 0 0
/dev/sda5 /var/lib/kubelet btrfs rw,noatime,compress-force=zstd:3,ssd,space_cache,subvolid=5,subvol=/ 0 0
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