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kubectl get nodes not showing workers

1/13/2017

I am following this tutorial with 2 vms running CentOS7. Everything looks fine (no errors during installation/setup) but I can't see my nodes.

NOTE:

I am running this on VMWare VMs
kub1 is my master and kub2 my worker node

kubectl get nodes output:

[root@kub1 ~]# kubectl cluster-info
Kubernetes master is running at http://kub1:8080

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

[root@kub2 ~]# kubectl cluster-info
Kubernetes master is running at http://kub1:8080

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

nodes:

[root@kub1 ~]# kubectl get nodes
[root@kub1 ~]# kubectl get nodes -a
[root@kub1 ~]#

[root@kub2 ~]# kubectl get nodes -a
[root@kub2 ~]# kubectl get no
[root@kub2 ~]#

cluster events:

[root@kub1 ~]# kubectl get events -a
LASTSEEN   FIRSTSEEN   COUNT     NAME         KIND      SUBOBJECT   TYPE      REASON     SOURCE                    MESSAGE
1h         1h          1         kub2.local   Node                  Normal    Starting   {kube-proxy kub2.local}   Starting kube-proxy.
1h         1h          1         kub2.local   Node                  Normal    Starting   {kube-proxy kub2.local}   Starting kube-proxy.
1h         1h          1         kub2.local   Node                  Normal    Starting   {kubelet kub2.local}      Starting kubelet.
1h         1h          1         node-kub2    Node                  Normal    Starting   {kubelet node-kub2}       Starting kubelet.
1h         1h          1         node-kub2    Node                  Normal    Starting   {kubelet node-kub2}       Starting kubelet.

/var/log/messages:

kubelet.go:1194] Unable to construct api.Node object for kubelet: can't get ip address of node node-kub2: lookup node-kub2: no such host

QUESTION: any idea why my nodes are not shown using "kubectl get nodes"?

-- Manuel Sopena Ballesteros

kubernetes

2 Answers

2/24/2018

Not sure about your scenario, but I have solved it after 3-4 hours of efforts.

Solved

I was facing this issue, because my docker cgroup driver was different than kubernetes cgroup driver. Just updated it to cgroupfs using following commands mentioned in doc.

cat << EOF > /etc/docker/daemon.json 
{
  "exec-opts": ["native.cgroupdriver=cgroupfs"]
}
EOF

Restart docker service service docker restart. Reset kubernetes on slave node: kubeadm reset Joined master again: kubeadm join <><>

It was visible on master using kubectl get nodes.

-- Amreesh Tyagi

Source: StackOverflow

1/13/2017

My issue was that the KUBELET_HOSTNAME on /etc/kubernetes/kubeletvalue didn't match the hostname.

I commented that line, then restarted the services and I could see my worker after that.

hope that helps

-- Manuel Sopena Ballesteros

Source: StackOverflow

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kubectl get nodes not showing workers

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