Tag: Vagrant

Multi node Kubernetes cluster on Vagrant

This is fast and easy way to install Kubernetes on Vagrant with Metrics server addon.

git clone https://github.com/vorozhko/practical-guide-to-kubernetes-administration-exam
cd vagrant/kubernetes
vagrant up

At this point you would have one master node and two worker nodes ready.

Lets check cluster health

vagrant ssh master

kubectl get nodes
NAME      STATUS   ROLES    AGE     VERSION
master    Ready    master   2m46s   v1.18.2
worker1   Ready    <none>   35s     v1.18.2
worker2   Ready    <none>   32s     v1.18.2

All nodes are ready.

Lets install Metrics server addon

kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.6/components.yaml

Update metrics server startup flags to solve nodes name resolution issue

kubectl -n kube-system edit deployment metrics-server

#Add following settings to metrics-server start command
- --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP
- --kubelet-insecure-tls

At this point Metrics server is installed.

After about few minutes of collecting data you should see:

kubectl top node
NAME      CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
master    264m         13%    1091Mi          57%       
worker1   109m         5%     746Mi           39%       
worker2   109m         5%     762Mi           40% 

kubectl top pod
NAME                                       CPU(cores)   MEMORY(bytes)   
calico-kube-controllers-75d56dfc47-bdsxr   1m           5Mi             
calico-node-rvqwp                          20m          23Mi            
calico-node-thtd4                          31m          25Mi            
calico-node-vkhgs                          23m          22Mi            
coredns-66bff467f8-x68zs                   4m           5Mi             
coredns-66bff467f8-z7kzh                   4m           10Mi            
etcd-master                                22m          39Mi            
kube-apiserver-master                      52m          352Mi           
kube-controller-manager-master             18m          55Mi            
kube-proxy-tdwpf                           1m           18Mi            
kube-proxy-wvsb9                           1m           8Mi             
kube-proxy-zfd2c                           1m           9Mi             
kube-scheduler-master                      5m           23Mi            
metrics-server-7c557b6b9f-h4hz2            1m           11Mi