Disable swap during system configuration#65
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kubelet has a hard requirement that swap be completely disabled.
vm.swappiness = 0ensures minimal swap usage but it didn't solve the root problem. We needswapoff -ato removes swap from/proc/swapsso kubelet can start properly.Sample error msg:
v-1 kubelet[12704]: I0205 10:58:14.917056 12704 manager.go:233] Version: {KernelVersion:6.8.0-94-generic ContainerOsVersion:Ubuntu 22.04.5 LTS DockerVersion: Docke>
Feb 05 10:58:14 bmoore-v-1 kubelet[12704]: I0205 10:58:14.917138 12704 server.go:772] "--cgroups-per-qos enabled, but --cgroup-root was not specified. defaulting to /"
Feb 05 10:58:14 bmoore-v-1 kubelet[12704]: I0205 10:58:14.917220 12704 swap_util.go:115] "Swap is on" /proc/swaps contents=<
Feb 05 10:58:14 bmoore-v-1 kubelet[12704]: Filename Type Size Used Priority
Feb 05 10:58:14 bmoore-v-1 kubelet[12704]: /swapfile file 3991548 0 -2
Feb 05 10:58:14 bmoore-v-1 kubelet[12704]: >
Feb 05 10:58:14 bmoore-v-1 kubelet[12704]: E0205 10:58:14.917245 12704 run.go:72] "command failed" err="failed to run Kubelet: running with swap on is not supported, please disable swap >
Feb 05 10:58:14 bmoore-v-1 systemd[1]: kubelet.service: Main process exited, code=exited, status=1/FAILURE
Feb 05 10:58:14 bmoore-v-1 systemd[1]: kubelet.service: Failed with result 'exit-code'.
Feb 05 10:58:15 bmoore-v-1 systemd[1]: kubelet.service: Scheduled restart job, restart counter is at 5.
Feb 05 10:58:15 bmoore-v-1 systemd[1]: Stopped Kubelet.
Feb 05 10:58:15 bmoore-v-1 systemd[1]: kubelet.service: Start request repeated too quickly.
Feb 05 10:58:15 bmoore-v-1 systemd[1]: kubelet.service: Failed with result 'exit-code'.
Feb 05 10:58:15 bmoore-v-1 systemd[1]: Failed to start Kubelet.