How to Setup a Kubernetes Cluster using KOPS on AWS?

KOPS installation in AWS

KOPS – Kubernetes Operations

Step-1
Launch one Ubuntu instance and execute the below steps to install kops.

Step-2
kops binary download
# curl -LO https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d ‘”‘ -f 4)/kops-linux-amd64
# chmod +x kops-linux-amd64
# sudo mv kops-linux-amd64 /usr/local/bin/kops

Step-3
aws cli setup to enable ubuntu to interact with aws.
# apt-get update
# apt-get install -y python-pip
# pip install awscli

# aws –version

Step-4
-> Create IAM user & make a note of access key & secruity key
-> Create S3 bucket and enable versioning.

# aws configure — Give access & security access key details here.

Step-5 
kubectl installation (K8s cli)
# snap install kubectl –classic
# kubectl version
# ssh-keygen -f .ssh/id_rsa

Step-6 
Environment variables setup — Remember cluster name should ends with k8s.local
updated these two vars in .bashrc & .profile in ~ dir.

# vi .bashrc 0r .profile 
export KOPS_CLUSTER_NAME=advith.k8s.local
export KOPS_STATE_STORE=s3://kops-state-advith-bucket

Step-7 
Create cluster:: — This will actually prepare the configuration files.
kops create cluster \\ –node-count=1 \\ –node-size=t2.micro \\ –master-size=t2.micro \\ –zones=us-east-1a \\ –name=${KOPS_CLUSTER_NAME}

(optional)if you wanted to review & edit the cluster configuration:
kops edit cluster –name ${KOPS_CLUSTER_NAME}

RUN if you’re okay withe the configuration run the command with –yes as like below:
kops update cluster –name ${KOPS_CLUSTER_NAME} –yes

Output shows like below..::
Cluster is starting. It should be ready in a few minutes.

Suggestions:
* validate cluster: kops validate cluster
* list nodes: kubectl get nodes –show-labels
* ssh to the master: ssh -i ~/.ssh/id_rsa admin@api.advith.k8s.local
* the admin user is specific to Debian. If not using Debian please use the appropriate user based on your OS.
* read about installing addons at: https://github.com/kubernetes/kops/blob/master/docs/addons.md.

To validate the cluster::
kops validate cluster
Validating cluster advith.k8s.local

INSTANCE GROUPS
NAME                            ROLE         MACHINETYPE    MIN    MAX     SUBNETS
master-us-east-1a     Master        m3.medium        1        1       us-east-1a
nodes                           Node           t2.medium          1       1       us-east-1a

NODE STATUS
NAME                                               ROLE       READY
ip-172-20-52-91.ec2.internal        node        True
ip-172-20-54-252.ec2.internal     master      True

Your cluster advith.k8s.local is ready

     Step-8
deploying dashboard feature::
# kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

Edit master’s security group:
– Make sure 443 port is allowed from ANYWHERE in aws security group.

To get admin user’s password::
root@ip-172-31-94-144:~ # kops get secrets kube –type secret -oplaintext Or grep password: ~/.kube/config
srlmyMCrxeIWfV6fhdElz1alo7lKWTeg

Launch kubernetes url:
http://master dns/ui
admin
passwrod

— Select the token option and paste the below one.

Token generation for admin:
root@ip-172-31-94-144:~# kops get secrets admin –type secret -oplaintext
8XmR3sAZCsV38gGCa5OhTYXtOPpBztTR

root@ip-172-31-94-144:~# kubectl cluster-info
  Kubernetes master is running at https://api-advith-k8s-local-df1a7n-1016419148.us-east-1.elb.amazonaws.com
  KubeDNS is running at https://api-advith-k8s-local-df1a7n-1016419148.us-east-1.elb.amazonaws.com/api/v1/namespaces/kube-system/services/kube-   dns:dns/proxy

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

root@ip-172-31-94-144:~# kubectl get nodes — To get the nodes status

NAME                                               STATUS     ROLES       AGE           VERSION
ip-172-20-59-100.ec2.internal      Ready       node         8m              v1.9.8
ip-172-20-63-182.ec2.internal      Ready      master       9m              v1.9.8

Deploy hello-minicube to validate::
root@ip-172-31-94-144:~# kubectl run hello-minikube –image=gcr.io/google_containers/echoserver:1.4 –port=8080
deployment.apps/hello-minikube created
root@ip-172-31-94-144:~# kubectl expose deployment hello-minikube –type=NodePort
service/hello-minikube exposed

kubectl get service

https://master-dns:nodeport/