Possible cause

kubelet 1.7.3 not reading config file /etc/systemd/system/kubelet.service.d/10-kubeadm.conf #50748

Solution

Troubleshooting kubeadm

If you are using CentOS and encounter difficulty while setting up the master node， verify that your Docker cgroup driver matches the kubelet config:

docker info | grep -i cgroupcat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

If the Docker cgroup driver and the kubelet config don’t match, change the kubelet config to match the Docker cgroup driver. The flag you need to change is --cgroup-driver. If it’s already set, you can update like so:

sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

This can be replaced with:

CG=$(sudo docker info 2>/dev/null | sed -n 's/Cgroup Driver: \(.*\)/\1/p')sed -i "s/cgroup-driver=systemd/cgroup-driver=$CG/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

On my environment it only worked the other way around. Setting systemd results always in an error. Here is my current setup

OS: CentOS 7.6.1810 Minikube Version v1.0.0Docker Version  18.06.2-ce

The solution for me was:Check /etc/docker/daemon.json and change systemd to cgroupfs

{  "exec-opts": ["native.cgroupdriver=cgroupfs"],  "log-driver": "json-file",  "log-opts": {    "max-size": "100m"  },  "storage-driver": "overlay2",  "storage-opts": [    "overlay2.override_kernel_check=true"  ]}

Then reload systemctl systemctl daemon-reloadKill the previous minikub config minikube deleteand start the minikube again minikube start --vm-driver=none

Now check the command line the output should find cgroupfs in both outputs

docker info | grep -i cgroupcat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

In the end you should see

   kubectl is now configured to use "minikube"=   Done! Thank you for using minikube!

Simple solution:Start your minikube with the Extra config parameter

--extra-config=kubelet.cgroup-driver=systemd

The complete command to start up minikube is the next line

minikube start --vm-driver=none --extra-config=kubelet.cgroup-driver=systemd

All the best and have fun

To get minicube running on a CentOS 7, I need to start it with a --extra-config=kubelet.cgroup-driver=systemd as suggested in https://github.com/kubernetes/minikube/issues/2192.