Kubelet by default will always create the root /kubepods cgroup, which all Kubernetes pods are started within. By not enforcing these two limits, they still have reserved resources but are allowed to overflow to the node’s total available resources. Only set the enforceNodeAllocatable flag if you have sufficiently profiled the resource utilization of services within the kube runtime and system cgroups and set their reserved resource limits accordingly! If set and the system or kube runtime processes exceed their resource reservations, they may be killed or fail to start. RuntimeCGroups: Absolute name for the cgroup that the container runtimes should run within.ĮnforceNodeAllocatable: A comma-separated list of levels of node allocatable enforcement applied by the kubelet, set to pods by default (available options: pods, kube-reserved, system-reserved). Generally, this is /system.slice which all system processes are started under.kubeletCGroups: Absolute name for the cgroup that Kubelet should run within. SystemReservedCGroup: Absolute name for the systemReserved cgroup. The node allocatable design proposal document recommends this be set to /podruntime.slice. KubeReservedCGroup: Absolute name for the kubeReserved cgroup. SystemReserved: Set CPU & Memory reserved resources for system processes, such as networkd, sshd, udev, timesyncd, etc. This includes kubelet and the docker daemon itself. KubeReserved: Set CPU, memory & ephemeral storage reserved resources for the container runtime processes. There are a range of flags that can be configured on the Kubelet to manage resource reservation, the more crucial ones are covered below.
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