I'm installing kubernetes(kubeadm) on centos VM running inside
Virtualbox
, so with yum I installed
kubeadm, kubelet
and
docker
.
Now while trying to setup cluster with
kubeadm init --pod-network-cidr=192.168.56.0/24 --apiserver-advertise-address=192.168.56.33/32
i run into the following error :
Unable to update cni config: No networks found in /etc/cni/net.d
Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
So I checked, no cni folder in /etc even that kubernetes-cni-0.6.0-0.x86_64 is installed. I Tried commenting KUBELET_NETWORK_ARGS in /etc/systemd/system/kubelet.service.d/10-kubeadm.conf but it didn't work.
I'm installing behind proxy.
I have multiple network adapters:
NAT : 10.0.2.15/24 for Internet
Host Only : 192.168.56.33/32
And docker interface : 172.17.0.1/16
There are several points to remember when setting up the cluster with "kubeadm init" and it is clearly documented on the Kubernetes site kubeadm cluster create:
"kubeadm reset" if you have already created a previous cluster
Remove the ".kube" folder from the home or root directory
(Also stopping the kubelet with systemctl will allow for a smooth setup)
Disable swap permanently on the machine, especially if you are rebooting your linux system
And not to forget, install a pod network add-on according to the instructions provided on the add on site (not Kubernetes site)
Follow the post initialization steps given on the command window by kubeadm.
If all these steps are followed correctly then your cluster will run properly.
And don't forget to do the following command to enable scheduling on the created cluster:
kubectl taint nodes --all node-role.kubernetes.io/master-
About how to install from behind proxy you may find this useful:
install using proxy
Use this PR (till will be approved):
kubectl -n kube-system apply -f https://raw.githubusercontent.com/coreos/flannel/bc79dd1505b0c8681ece4de4c0d86c5cd2643275/Documentation/kube-flannel.yml
it's a known issue: coreos/flannel#1044
It was a proxy error as mentionned in Github https://github.com/kubernetes/kubernetes/issues/34695
They suggested to use kubeadm init --use-kubernetes-version v1.4.1 but i change my network entirely (no proxy) and i manage to setup my cluster.
After that we can setup pod network with kubectl apply -f ... see https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/#pod-network
I could not see the helm server version:
$ helm version --tiller-namespace digital-ocean-namespace
Client: &version.Version{SemVer:"v2.13.1", GitCommit:"618447cbf203d147601b4b9bd7f8c37a5d39fbb4", GitTreeState:"clean"}
Error: could not find a ready tiller pod
The kubectl describe node kubernetes-master --namespace digital-ocean-namespace command was showing the message:
NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
The nodes was not ready:
$ kubectl get node --namespace digital-ocean-namespace
NAME STATUS ROLES AGE VERSION
kubernetes-master NotReady master 82m v1.14.1
kubernetes-worker-1 NotReady <none> 81m v1.14.1
I had a version compatibility issue between Kubernetes and the flannel network.
My k8s version was 1.14 as seen in the command:
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.1", GitCommit:"b7394102d6ef778017f2ca4046abbaa23b88c290", GitTreeState:"clean", BuildDate:"2019-04-08T17:11:31Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.1", GitCommit:"b7394102d6ef778017f2ca4046abbaa23b88c290", GitTreeState:"clean", BuildDate:"2019-04-08T17:02:58Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
After re-installing the flannel network with the command:
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
I could then see the helm server version:
$ helm version --tiller-namespace digital-ocean-namespace
Client: &version.Version{SemVer:"v2.13.1", GitCommit:"618447cbf203d147601b4b9bd7f8c37a5d39fbb4", GitTreeState:"clean"}
Server: &version.Version{SemVer:"v2.13.1", GitCommit:"618447cbf203d147601b4b9bd7f8c37a5d39fbb4", GitTreeState:"clean"}
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