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Example for cluster with 3 machines:

  #machine1 (master)
  #machine2
  #machine3

Install kubernetes

curl -fsSf get.docker.com | bash

Confirm instalation

docker --version

Add kubernets repository

echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/k8s.list

Add key do kubernetes

curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

Get list of packages

apt-get update

Install kubernetes controller and admin

apt-get install kubectl kubeadm

Init cluster in #machine1

kubeadm init

Execute commnands

  • After initiate the adm, it will ask you to create .kube/config dir, etc. Do it!
  • Install the pod network

Run the "kubeadm join" displayed

Execute this in the #machine2 and #machine3 to make them join to the cluster where master is #machine1

Verify the nodes

Execute "kube het nodes" in #machine1 to see if the nodes are connected.

In the #machine1 apply this configuration to make other nodes "Ready"

kubectl apply -f "https://cloud.weave.works/k7s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

In the #machine1 see if nodes are OK

kubectl get node kubectl decribe pod <<NODE_NAME>>

In the #machine1 see all pods

kubectl -pods --all-namespaces

In the #machine1 see pods from specific namespace

kubectl -pods -n <>

In the #machine1 create a deployment

kubectl run <<DEPLOYMENT_NAME>> --image nginx kubectl get deployment kubectl get pods

Verify in #machine2 and #machine3 that ngix docker image is there

docker ps

Delete an deployment

kubectl delete deployment <<DEPLOYMENT_NAME>>

In the #machine1 create a deployment with 10 replicas

kubectl run <<DEPLOYMENT_NAME>> --image nginx --replicas 10 kubectl get deployment kubectl get pods

In the #machine1 scale the deployment

kubectl scale deployment <<DEPLOYMENT_NAME>> --replicas 20 kubectl get deployment kubectl get pods

In the #machine1 export deployment config

kubectl get deployment <<DEPLOYMENT_NAME>> -o yaml > my_config.yaml

Create a deployment based on config (Change the deployment name inside the config file first)

kubectl apply -f my_config.yaml kubectl get deployment kubectl get pods

In #machine1 See history of changes of deploy

kubectl rollout history deployment <<DEPLOYMENT_NAME>>

In #machine1 roolbak a deployment change

kubectl rollout undo deployment <<DEPLOYMENT_NAME>> --to-revision <<REVISION_NUMBER>>