Kubernetes cluster recipes not seeing nodes

GabrielG

It's hard to say without knowing what went wrong during the installation.

First, I would say to check if the config file /home/debian/.kube/config is the same as /etc/kubernetes/admin.conf and if debian is correctly assign as the owner of the file.

fred974

@GabrielG the file content are identical but the file ownership is different. admin.conf is owned by root and not 'debian'. Should it be debian?

debian@master:~/.kube$ pwd
/home/debian/.kube

debian@master:~/.kube$ ls -la
total 20
drwxr-xr-x 3 root   root   4096 Mar 21 13:36 .
drwxr-xr-x 4 debian debian 4096 Mar 21 13:36 ..
drwxr-x--- 4 root   root   4096 Mar 21 13:36 cache
-rw------- 1 debian debian 5638 Mar 21 13:36 config

debian@master:/etc/kubernetes$ pwd
/etc/kubernetes
debian@master:/etc/kubernetes$ ls -la
total 44
drwxr-xr-x  4 root root 4096 Mar 21 13:36 .
drwxr-xr-x 77 root root 4096 Mar 27 04:07 ..
-rw-------  1 root root 5638 Mar 21 13:36 admin.conf
-rw-------  1 root root 5674 Mar 21 13:36 controller-manager.conf
-rw-------  1 root root 1962 Mar 21 13:36 kubelet.conf
drwxr-xr-x  2 root root 4096 Mar 21 13:36 manifests
drwxr-xr-x  3 root root 4096 Mar 21 13:36 pki
-rw-------  1 root root 5622 Mar 21 13:36 scheduler.conf

GabrielG

@fred974 said in Kubernetes cluster recipes not seeing nodes:

Should it be debian?

No, only the /home/debian/.kube/config is meant to be owned by debian user.

Are you using kubectl with debian user or with the root user?

fred974

@GabrielG said in Kubernetes cluster recipes not seeing nodes:

Are you using kubectl with debian user or with the root user?

I was using the root account I tried with the debian user and I now get something

debian@master:~$ kubectl get nodes
NAME     STATUS   ROLES           AGE     VERSION
master   Ready    control-plane   5d23h   v1.26.3
node-2   Ready    <none>          5d23h   v1.26.3

I have created a cluster with 1x master and 3x nodes. Should the output of the command above return 2 nodes?

GabrielG

Yes, you should have something like that:

debian@master:~$ kubectl get nodes
NAME     STATUS   ROLES           AGE     VERSION
master   Ready    control-plane   6m52s   v1.26.3
node-1   Ready    <none>          115s    v1.26.3
node-2   Ready    <none>          2m47s   v1.26.3
node-3   Ready    <none>          2m36s   v1.26.3

Are all worker nodes vm started? What's the output of kubectl get events?

fred974

@GabrielG Sorry for the late reply. Here is what I have.

debian@master:~$ kubectl get nodes
NAME     STATUS   ROLES           AGE     VERSION
master   Ready    control-plane   7d22h   v1.26.3
node-2   Ready    <none>          7d22h   v1.26.3

and

debian@master:~$ kubectl get events
No resources found in default namespace.

GabrielG

Thank you.

Are all VMs started?

What's the output of kubectl get pods --all-namespaces?

fred974

@GabrielG said in Kubernetes cluster recipes not seeing nodes:

Are all VMs started?

Yes, all the VMs are up and running

@GabrielG said in Kubernetes cluster recipes not seeing nodes:

What's the output of kubectl get pods --all-namespaces?

debian@master:~$ kubectl get pods --all-namespaces
NAMESPACE      NAME                             READY   STATUS    RESTARTS        AGE
kube-flannel   kube-flannel-ds-mj4n6            1/1     Running   2 (3d ago)      8d
kube-flannel   kube-flannel-ds-vtd2k            1/1     Running   2 (6d19h ago)   8d
kube-system    coredns-787d4945fb-85867         1/1     Running   2 (6d19h ago)   8d
kube-system    coredns-787d4945fb-dn96g         1/1     Running   2 (6d19h ago)   8d
kube-system    etcd-master                      1/1     Running   2 (6d19h ago)   8d
kube-system    kube-apiserver-master            1/1     Running   2 (6d19h ago)   8d
kube-system    kube-controller-manager-master   1/1     Running   2 (6d19h ago)   8d
kube-system    kube-proxy-fmjnv                 1/1     Running   2 (6d19h ago)   8d
kube-system    kube-proxy-gxsrs                 1/1     Running   2 (3d ago)      8d
kube-system    kube-scheduler-master            1/1     Running   2 (6d19h ago)   8d

Thank you very much

fred974

@GabrielG Do you think I should delete all the VMs and reun the deploy recipe again? Also is it normal that I no longer have the option to set a network CIDR like before?

GabrielG

You can do that but it won't help us to understand what when wrong during the installation of the worker nodes 1 and 3.

Can you show me what's the output of sudo cat /var/log/messages for each nodes (master and workers)?

Concerning the CIDR, we are now using flannel as Container Network Interface, which uses a default CIDR (10.244.0.0/16) allocated to the pods network.

fred974

@GabrielG said in Kubernetes cluster recipes not seeing nodes:

Can you show me what's the output of sudo cat /var/log/messages for each nodes (master and workers)?

From the master:

debian@master:~$ sudo cat /var/log/messages
Mar 26 00:10:18 master rsyslogd: [origin software="rsyslogd" swVersion="8.2102.0" x-pid="572" x-info="https://www.rsyslog.com"] rsyslogd was HUPed

From node1:
https://pastebin.com/xrqPd88V

From node2:
https://pastebin.com/aJch3diH

From node3:
https://pastebin.com/Zc1y42NA

GabrielG

Thank you, I'll take a look tomorrow.

Is it the whole output for the master?

fred974

@GabrielG yes, all of it

fred974

@GabrielG did you get a chance to look at the log I provided? Any clues?

GabrielG

Hi,

Nothing useful. Maybe you can try to delete the VMs and redeploy the cluster.

fred974

@GabrielG said in Kubernetes cluster recipes not seeing nodes:

Nothing useful. Maybe you can try to delete the VMs and redeploy the cluster.

Ok I will do that. Whilst I redeploy the cluster, what I am looking for? What log to monitor etc?

GabrielG

I'd say any error in the console during the cloud-init installation.

fred974

@GabrielG I deleted the VMs and redeployed it with3 nodes.
So far only the Master VM has been created and nothing else. I am missing the 3x nodes.
When I look at the console of the master VM, all I get is this:

So the master VM is created but nothing has been deployed

I have no error on Xen Orchestra screen or log

GabrielG

The cloud-init installation comes after the step on your screenshot.

Are the 3 nodes VMs started? Can you post the output of sudo cat /var/log/messages?

fred974

@GabrielG said in Kubernetes cluster recipes not seeing nodes:

Are the 3 nodes VMs started? Can you post the output of sudo cat /var/log/messages?

No node come up. Do you need the message log from all the hosts ?