Disabling swap

[ptr-dorjin]

Do we also need to disable swap before installing K3s?
I know that swap MUST be disabled before running kubelet (https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/)
I can't find that this role disables swap, and I don't see it in the prerequisites, so I'm not sure if I can install K3s with swap enabled.
What am I missing?

[vasanthaganeshk]

My cluster runs with swap.

[St0rmingBr4in]

swap should be disabled yes. We need to have this be at least specified in the README

[xamindar]

swap should be disabled yes. We need to have this be at least specified in the README

Can you provide info on why swap needs to be disabled? From my reading around it appears k8s, and by extension, k3s should run fine with swap enabled on more recent versions.

[dberardo-com]

how to check the level of swappiness inside the pod?

is this hte proper way ?

cat /proc/sys/vm/swappines

and also, i see that some pods are not being killed when the RAM usage goes bezond the limit.memory. could it be because of swap ? for example, i have a pod with a limit of 250MB mem, which is running (according to metrics-server) at 345 MB of mem. But if i run the command above, i see a level of swappiness of 30, so can i assume that the actual memory consumed is:

345 - 345*0.3 = 241.5 MB ?

[DonBower]

swap should be disabled yes. We need to have this be at least specified in the README

Can you provide info on why swap needs to be disabled? From my reading around it appears k8s, and by extension, k3s should run fine with swap enabled on more recent versions.

https://discuss.kubernetes.io/t/swap-off-why-is-it-necessary/6879/3

[dereknola]

Added note in README about disabling swap.