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Exercise 1 - Startup a Kubernetes Cluster

Pre requisite

Install Kops

Github Kops install

MacOS

From Homebrew:

brew update && brew install kops

From Github:

wget -O kops 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-darwin-amd64
chmod +x ./kops
sudo mv ./kops /usr/local/bin/

You can also install from source.

Linux

From Github:

wget -O kops 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
sudo mv ./kops /usr/local/bin/

AWS User

Have created a user with sufficient privileges:

AmazonEC2FullAccess
AmazonRoute53FullAccess
AmazonS3FullAccess
IAMFullAccess
AmazonVPCFullAccess

You can create kops user with console or with folowing aws cli command line:

aws iam create-group --group-name kops

aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonEC2FullAccess --group-name kops
aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonRoute53FullAccess --group-name kops
aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonS3FullAccess --group-name kops
aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/IAMFullAccess --group-name kops
aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonVPCFullAccess --group-name kops

aws iam create-user --user-name kops

aws iam add-user-to-group --user-name kops --group-name kops

aws iam create-access-key --user-name kops

Retrieve AWS KEY

Domain registration on AWS Route 53

You can create a subdomain or attach to an existing domain

Check your domain

dig ns mydemodomain.domain.cloud
;; ANSWER SECTION:
mydemodomain.domain.cloud. 866 IN	SOA ns-138.awsdns-17.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

You need to retrieve Hosted Zone ID from console or command line

S3 Bucket for State Store

You need to create an S3 Bucket to keep the state of your k8s cluster and be able to perform admin tasks

aws s3api create-bucket \
    --bucket mydemobucket-cloud-state-store \
    --region eu-central-1

Retrieve S3 address

Create your dedicated VPC (Optional)

VPC Creation

Retrieve VPC Id

Create you AWS Internet Gateway (Optional)

If you have previously created a dedicated VPC you need to create an AWS Internet Gateway:

VPC Creation

And attach it to your VPC:

VPC Creation

Create your Cluster

Launch Creation

Export AWS credential and s3 bucket

export AWS_ACCESS_KEY_ID=XXXXXX
export AWS_SECRET_ACCESS_KEY=XXXXX
export KOPS_STATE_STORE=s3://mydemobucket-cloud-state-store

We are now ready to launch our k8 cluster creation. In this exercise we will create a public cluster split in three AZ has bellow:

AWS K8S Overview

kops create cluster  \
  --node-count 3 \
  --zones eu-central-1a,eu-central-1b,eu-central-1c \
  --master-zones eu-central-1a,eu-central-1b,eu-central-1c  \
  --dns-zone=YOURHOSTEDZONEID \
  --node-size t2.micro \
  --master-size t2.micro  \
  --topology private \
  --networking calico \
  --vpc=YOURVPCID \
  --bastion  \
  --kubernetes-version=1.7.6 \
  --name=k8s-main.mydemodomain.domain.cloud \
  --cloud-labels "Name=Test Cluster,Env=Demo" \
  --ssh-public-key ~/.ssh/mykey.pub

Launch installation:

kops update cluster k8s-main.mydemodomain.domain.cloud --yes

Check installation:

Validate Cluster Creation on AWS:

kops validate cluster

Validation K8S cluster:

kubectl get nodes

Install Addons

Install addon if needed:

  • Add Heapster
  • Add Dashboard
  • External DNS
  • Node Problem Detector

Post Installation

If you want to use admission control you need to edit existing cluster and add following line:

kops edit cluster k8s-main.mydemodomain.domain.cloud
kubeAPIServer:
    admissionControl:
    - NamespaceLifecycle
    - LimitRanger
    - ServiceAccount
    - PersistentVolumeLabel
    - DefaultStorageClass
    - ResourceQuota
    - DefaultTolerationSeconds
    - Initializers
    runtimeConfig:
      admissionregistration.k8s.io/v1alpha1: "true"

Perfom update:

kops update cluster --yes
kops rolling-update cluster --yes

Check result with:

kubectl api-versions | grep admi
;;; 
admissionregistration.k8s.io/v1alpha1