CFDSA - Container for Deployment and Scaling Apps

Installing Metrics Server

Copy the metrics-server deployment

Go to [https://github.com/kubernetes-sigs/metrics-server/releases] (https://github.com/kubernetes-sigs/metrics-server/releases) and download the latest release. The file should be components.yaml.

Update metrics-server pod

Edit components.yaml. Look for the following line:

image: k8s.gcr.io/metrics-server-amd64:v0.3.1

and perform the following edits

containers:
 name: metrics-server
  image: k8s.gcr.io/metrics-server-amd64:vx.x.x
  imagePullPolicy: IfNotPresent
  args:
  - --cert-dir=/tmp
  - --secure-port=4443
 # add the lines below
  - --kubelet-insecure-tls
  - --kubelet-preferred-address-types=InternalIP

Ref SO: Unable to get pod metrics to use in horizontal pod autoscaling -Kubernetes

Install metrics-server

Install the metrics server in the usual manner

kubectl apply -f components.yaml

Verify that metrics-server is deploy with the following

kubectl get svc/metrics-server -n kube-system

NAME             TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                  AGE
kube-dns         ClusterIP   10.245.0.10      <none>        53/UDP,53/TCP,9153/TCP   25h
metrics-server   ClusterIP   10.245.165.141   <none>        443/TCP                  24h

Verify that the metrics server is indeed collecting metrics by executing a top.

kubectl top nodes

NAME                   CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
pool-95hh57dhz-389l6   129m         6%     1857Mi          59%       
pool-95hh57dhz-389lt   136m         6%     1778Mi          57%      

Note you may have to wait a minute or two before the stats appear.

Installing WebUI

WebUI in not installed by default. To install Kubernetes' WebUI, go to the release page and find the latest (or desired version). Install with kubectl apply

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.x.x/aio/deploy/recommended.yaml

On a terminal, start a proxy server

kubectl proxy

The WebUI can now be accessed with the following URL

http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/

Login to WebUI

Create a service account and give it the cluster-admin role (or you can create a role with limited privileges).

---
apiVersion: v1
kind: ServiceAccount

metadata:
   name: webui-user
   namespace: kube-system

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding

metadata:
   name: webui-user
   namespace: kube-system

roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: ClusterRole
   name: cluster-admin

subjects:
- kind: ServiceAccount
  name: webui-user
  namespace: kube-system

Create the service account kubectl apply -f sa.yaml assuming the file is called sa.yaml.

Get the secret for the service account

kubectl describe sa/webui-user -n kube-system

Look for Mountable secrets. Copy the secret's name.

kubectl describe secret/secret_name_here -n kube-system

Copy the token value and paste it into the 'Enter token' field.

Alternative to Web UI

If you are concern about the load WebUI place on your cluster, you can try out-of-cluster tool like Octant

Installing Nginx Ingress Controller

Nginx Ingress controller is deployed using helm. Create a namespace called nginx-ingress and deploy the helm chart into the namespace.

helm install <release name> stable/nginx-ingress --version <version number> -n nginx-ingress

Verify that a load balancer is provisioned by running the following command

kubectl get svc -n nginx-ingress

NAME            TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)                      AGE
ingress-nginx   LoadBalancer   10.245.17.17   157.230.196.98   80:30077/TCP,443:31512/TCP   21m

Note: EXTERNAL-IP will show an external IP address once the load balancer has been deployed. A <pending> indicates that the cloud provider is still provisioning the load balancer. You can verify the that the load balancer has indeed been provisioned by checking it in your cloud console.