When you want to try the kubenetes, the most easy way is start kubenetes cluseter with a command “minikube start”. If you don’t want to start all these things in vm and add a “–vm-driver=none” flag to start minikube, the error will probably be printed to indicate that kubelet’s cgroup is different from dockers’ systemd:
failed to create kubelet: misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd".
minikube start provides the “–extra-config” to configure different things to kubelet, apiserver and all other components:
Usage:
minikube start [flags]
Flags:
--apiserver-name string The apiserver name which is used in the generated certificate for localkube/kubernetes. This can be used if you want to make the apiserver available from outside the machine (default "minikubeCA")
--cache-images If true, cache docker images for the current bootstrapper and load them into the machine. (default true)
--container-runtime string The container runtime to be used
--cpus int Number of CPUs allocated to the minikube VM (default 2)
--disable-driver-mounts Disables the filesystem mounts provided by the hypervisors (vboxfs, xhyve-9p)
--disk-size string Disk size allocated to the minikube VM (format: <number>[<unit>], where unit = b, k, m or g) (default "20g")
--dns-domain string The cluster dns domain name used in the kubernetes cluster (default "cluster.local")
--docker-env stringArray Environment variables to pass to the Docker daemon. (format: key=value)
--docker-opt stringArray Specify arbitrary flags to pass to the Docker daemon. (format: key=value)
--extra-config ExtraOption A set of key=value pairs that describe configuration that may be passed to different components.
The key should be '.' separated, and the first part before the dot is the component to apply the configuration to.
Valid components are: kubelet, apiserver, controller-manager, etcd, proxy, scheduler.
All the kublet options you can pass with “–extra-config” are defined in KubeletConfiguration.go: https://godoc.org/k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig#KubeletConfiguration
So here we pass the cgroup-driver=systemd to kubelet with:
minikube --vm-driver=none --extra-config=kubelet.CgroupDriver=systemd --extra-config=kubelet.EvictionHard="memory.available<500Mi,nodefs.available<100Mi,imagefs.available<100Mi" start
If you start minikube in not free space left disk, the “DiskPressure” eviction signal alarms and no pod started in you node. Add a “kubelet.EvicationHard” option as above to clam down kubelet.