2.4.3. Node setup¶

2.4.3.1. Join the master¶

to join the master we need to run the command highlighted during the master initialization. In our setup it was:

sudo kubeadm join --token=62468f.9dfb3fc97a985cf9 10.1.10.11

the output should be like this :

to make sure that your nodes have joined, you can run this command on the master:

kubectl get nodes

You should see your cluster (ie master + nodes)

Check that all the services are started as expected (run on the master):

kubectl get pods --all-namespaces

Here we see that some weave net containers keep restarting. This is due to our multi nic setup. Check this link: Deploying Kubernetes 1.4 on Ubuntu Xenial with Kubeadm

You can validate this by connecting to a node and check the logs for the relevant container

to fix this, you need to run the following command on the master:

sudo apt-get install -y jq

kubectl -n kube-system get ds -l 'component=kube-proxy' -o json | jq '.items[0].spec.template.spec.containers[0].command |= .+ ["--cluster-cidr=10.32.0.0/12"]' | kubectl apply -f - && kubectl -n kube-system delete pods -l 'component=kube-proxy'

Once this is done, you may check that everything is in a stable “Running” state:

kubectl get pods --all-namespaces

If you want to enable Kubernetes UI, you may install the dashboard. Run the following command on the master

First download a copy of the YAML file to deploy the dashboard.

wget https://git.io/kube-dashboard-no-rbac -O kube-dashboard-no-rbac.yml

Modify the service to be type NodePort

spec:
  ports:
  - port: 80
    targetPort: 9090
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard

Now run

kubectl create -f kube-dashboard-no-rbac.yml

You should see the following output:

deployment "kubernetes-dashboard" created
service "kubernetes-dashboard" created

to access the dashboard, you need to see on which port it is listening. You can find this information with the following command (on the master):

kubectl describe svc kubernetes-dashboard -n kube-system

Here we can see that it is listening on port: 31578 (NodePort)

We can now access the dashboard by connecting to the following uri http://<master IP>:31578