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How to setup Kubernetes cluster on AWS

Running an application in the cloud without the proper tools to manage it and improve its functionality can be tricky. That is why when deploying a customer’s application you want to have the means for fast deployment, features roll out, resource management, resilience and automation of certain operations. Kubernetes is an open-source platform that gives you a set of tools to do just that. 


Today we will run Kubernetes multi-master cluster on AWS and deploy a simple application. We’ll use kops (Kubernetes Operations), which is a utility for managing Kubernetes clusters. In our opinion, currently kops is the best tool for deploying Kubernetes clusters in Amazon Web Services
.

1. Creating a zone in Route53:


aws route53 create-hosted-zone –name example.com

2. Creating an S3 bucket to store the cluster configuration:


aws s3api create-bucket   --bucket kubernetes-cluster  --region eu-west-1

We include versioning:

aws s3api put-bucket-versioning --bucket kubernetes-cluster  --versioning-configuration Status=Enabled

3. Creating our new cluster 

export KOPS_STATE_STORE=s3://kubernetes-cluster
 
kops create cluster \
--name example.com \
--master-zones eu-west-1a,eu-west-1b,eu-west-1c \
--zones eu-west-1a,eu-west-1b,eu-west-1c \
--state s3://kubernetes-cluster \
--node-count 3 \
--yes \

name                          cluster name should be identical to zone name

master-zones            zones where masters will be launched

zones                          zones where the nodes will be located 

state                            configuration storage bucket 

node-count                a number of nodes in the cluster

yes                               applies changes 

Checking availability of the cluster:

kops validate cluster

The output:

Using cluster from kubectl context: example.com
 
Validating cluster example.com
 
INSTANCE GROUPS
NAME			ROLE	MACHINETYPE	MIN	MAX	SUBNETS
master-eu-west-1a	Master	m3.medium	1	1	eu-west-1a
master-eu-west-1b	Master	m3.medium	1	1	eu-west-1b
master-eu-west-1c	Master	m3.medium	1	1	eu-west-1c
nodes			Node	t2.medium	3	3	eu-west-1a,eu-west-1b,eu-west-1c
 
NODE STATUS
NAME						ROLE	READY
ip-174-21-107-10.eu-west-1.compute.internal	node	True
ip-174-21-113-20.eu-west-1.compute.internal	master	True
ip-174-21-38-94.eu-west-1.compute.internal	node	True
ip-174-21-53-131.eu-west-1.compute.internal	node	True
ip-174-21-61-2.eu-west-1.compute.internal	master	True
ip-174-21-67-114.eu-west-1.compute.internal	master	True
Your cluster example.com is ready

Kops also creates settings for kubectl. We can also do:

kubectl get node

The output:

ip-174-21-107-10.eu-west-1.compute.internal   Ready     11d       v1.7.2
ip-174-21-113-20.eu-west-1.compute.internal   Ready     11d       v1.7.2
ip-174-21-38-94.eu-west-1.compute.internal    Ready     11d       v1.7.2

To edit nodes configuration, we do this:

kops edit ig nodes

Editing the file:

apiVersion: kops/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: 2017-10-02T23:10:46Z
  labels:
    kops.k8s.io/cluster: example.com
  name: nodes
spec:
  image: kope.io/k8s-1.7-debian-jessie-amd64-hvm-ebs-2017-07-28
  machineType: t2.medium -> t2.xlarge
  maxSize: 3 -> 4
  minSize: 3 -> 4
  role: Node
  subnets:
  - eu-west-1a
  - eu-west-1b
  - eu-west-1c

Saving the file and applying the configuration:

kops rolling-update cluster –yes

Checking the state of the cluster:

kops validate cluster

The output:

nodes	Node  t2.xlarge	  4	4    eu-west-1a,eu-west-1b,eu-west-1c

For convenience, let’s deploy a dashboard:

kubectl create -f https://raw.githubusercontent.com/kubernetes/kops/master/addons/kubernetes-dashboard/v1.6.3.yaml

Dashboard will be available at:

https://api.example.com/api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/#!/pod?namespace=default


Now we will deploy a simple web application, with a setup for balancer with ssl and a domain name



To associate Kubernetes with Route53, we’ll need to deploy pod:


kubectl apply -f https://raw.githubusercontent.com/kubernetes/kops/master/addons/route53-mapper/v1.3.0.yml

In the IAM role, we’ll need to find the names of the nodes and add policy:


" Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "route53:ListHostedZonesByName",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "elasticloadbalancing:DescribeLoadBalancers",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "route53:ChangeResourceRecordSets",
            "Resource": "*"
        }
    ]
}

Writing a yaml file for Deployments:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: project-ci
spec:
  replicas: 2
  template:
    metadata:
      labels:
        projectenv: ci
    spec:
      containers:
        - name: project
          image: ecr.eu-west-1.amazonaws.com/project
          env:
           - name: DEPLOYMENT_ENV
              value: "ci"
            - name: FILEBEAT_ENABLE
              value: "yes"
          ports:
            - containerPort: 80

Now creating a yaml file for Service:

kind: Service
apiVersion: v1
metadata:
  annotations:
    domainName: "projectci.example.com."
    service.beta.kubernetes.io/aws-load-balancer-ssl-cert: "arn:aws:acm:us-west-1:659153740712:certificate/xxxxxxxx"
    service.beta.kubernetes.io/aws-load-balancer-ssl-ports: "443"
    service.beta.kubernetes.io/aws-load-balancer-backend-protocol: http
  name: projectci
  labels:
    projectenv: ci
    dns: route53
spec:
  selector:
    projectenv: ci
  ports:
    - name: "https"
      protocol: TCP
      port: 443
  type: LoadBalancer

After deployment, we'll see our application at https://projectci.example.com 


And in the AWS console we’ll see the newly created balancer:

That's it! 

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