Download Kubectl
Linux: https://storage.googleapis.com/kubernetes-release/release/v1.11.0/bin/linux/amd64/kubectl
MacOS: https://storage.googleapis.com/kubernetes-release/release/v1.11.0/bin/darwin/amd64/kubectl
Windows: https://storage.googleapis.com/kubernetes-release/release/v1.11.0/bin/windows/amd64/kubectl.exe
Or use a packaged version for your OS: see https://kubernetes.io/docs/tasks/tools/install-kubectl/
Minikube
Project URL: https://github.com/kubernetes/minikube
Latest Release and download instructions: https://github.com/kubernetes/minikube/releases
VirtualBox: http://www.virtualbox.org
Minikube on windows:
Download the latest minikube-version.exe
Rename the file to minikube.exe and put it in C:\minikube
Open a cmd (search for the app cmd or powershell)
Run: cd C:\minikube and enter minikube start
Test your cluster commands
Make sure your cluster is running, you can check with minikube status.
If your cluster is not running, enter minikube start first.
kubectl run hello-minikube --image=k8s.gcr.io/echoserver:1.4 --port=8080
kubectl expose deployment hello-minikube --type=NodePort
minikube service hello-minikube --url
<open a browser and go to that url>
Kops
Project URL
https://github.com/kubernetes/kops
Free DNS Service
Sign up at http://freedns.afraid.org/
Choose for subdomain hosting
Enter the AWS nameservers given to you in route53 as nameservers for the subdomain
http://www.dot.tk/ provides a free .tk domain name you can use and you can point it to the amazon AWS nameservers
Namecheap.com often has promotions for tld’s like .co for just a couple of bucks
Cluster Commands
kops create cluster --name=kubernetes.newtech.academy --state=s3://kops-state-b429b --zones=eu-west-1a --node-count=2 --node-size=t2.micro --master-size=t2.micro --dns-zone=kubernetes.newtech.academy
kops update cluster kubernetes.newtech.academy --yes --state=s3://kops-state-b429b
kops delete cluster --name kubernetes.newtech.academy --state=s3://kops-state-b429b
kops delete cluster --name kubernetes.newtech.academy --state=s3://kops-state-b429b --yes
Kubernetes from scratch
You can setup your cluster manually from scratch
If you’re planning to deploy on AWS / Google / Azure, use the tools that are fit for these platforms
If you have an unsupported cloud platform, and you still want Kubernetes, you can install it manually
CoreOS + Kubernetes: ###a href="https://coreos.com/kubernetes/docs/latest/getting-started.html">https://coreos.com/kubernetes/docs/latest/getting-started.html
Docker
You can download Docker Engine for:
Windows: https://docs.docker.com/engine/installation/windows/
MacOS: https://docs.docker.com/engine/installation/mac/
Linux: https://docs.docker.com/engine/installation/linux/
DevOps box
Virtualbox: http://www.virtualbox.org
Vagrant: http://www.vagrantup.com
DevOps box: https://github.com/wardviaene/devops-box
Launch commands (in terminal / cmd / powershell):
cd devops-box/
vagrant up
Launch commands for a plain ubuntu box:
mkdir ubuntu
vagrant init ubuntu/xenial64
vagrant up
Cheatsheet: Docker commands
Build image: docker build .
Build & Tag: docker build -t wardviaene/k8s-demo:latest .
Tag image: docker tag imageid wardviaene/k8s-demo
Push image: docker push wardviaene/k8s-demo
List images: docker images
List all containers: docker ps -a
Cheatsheet: Kubernetes commands
kubectl get pod: Get information about all running pods
kubectl describe pod <pod>: Describe one pod
kubectl expose pod <pod> --port=444 --name=frontend: Expose the port of a pod (creates a new service)
kubectl port-forward <pod> 8080: Port forward the exposed pod port to your local machine
kubectl attach <podname> -i: Attach to the pod
kubectl exec <pod> -- command: Execute a command on the pod
kubectl label pods <pod> mylabel=awesome: Add a new label to a pod
kubectl run -i --tty busybox --image=busybox --restart=Never -- sh: Run a shell in a pod - very useful for debugging
kubectl get deployments: Get information on current deployments
kubectl get rs: Get information about the replica sets
kubectl get pods --show-labels: get pods, and also show labels attached to those pods
kubectl rollout status deployment/helloworld-deployment: Get deployment status
kubectl set image deployment/helloworld-deployment k8s-demo=k8s-demo:2: Run k8s-demo with the image label version 2
kubectl edit deployment/helloworld-deployment: Edit the deployment object
kubectl rollout status deployment/helloworld-deployment: Get the status of the rollout
kubectl rollout history deployment/helloworld-deployment: Get the rollout history
kubectl rollout undo deployment/helloworld-deployment: Rollback to previous version
kubectl rollout undo deployment/helloworld-deployment --to-revision=n: Rollback to any version version
AWS Commands
aws ec2 create-volume --size 10 --region us-east-1 --availability-zone us-east-1a --volume-type gp2
Certificates
Creating a new key for a new user: openssl genrsa -out myuser.pem 2048
Creating a certificate request: openssl req -new -key myuser.pem -out myuser-csr.pem -subj "/CN=myuser/O=myteam/"
Creating a certificate: openssl x509 -req -in myuser-csr.pem -CA /path/to/kubernetes/ca.crt -CAkey /path/to/kubernetes/ca.key -CAcreateserial -out myuser.crt -days 10000
Abbreviations used
Resource type: Abbreviated alias
configmaps: cm
customresourcedefinition: crd
daemonsets: ds
deployments deploy
horizontalpodautoscalers: hpa
ingresses ing
limitranges limits
namespaces: ns
nodes: no
persistentvolumeclaims: pvc
persistentvolumes: pv
pods: po
replicasets: rs
replicationcontrollers: rc
resourcequotas: quota
serviceaccounts: sa
services: svc
Quick Commands
$ kubectl version
The client version is the kubectl version; the server version is the Kubernetes version installed on the master.
$ kubectl cluster-info
Kubernetes master and DNS info
$ kubectl get nodes
View Cluster nodes
$ kubectl run hello-kubernetes --image=k8s.gcr.io/echoserver:1.4 --port 8080
Deploy App
$ kubectl expose deployment hello-kubernetes --type=NodePort
Expose App
$ kubectl get service hello-kubernetes
Get service details
$ kubectl get deployments
List deployments
$ kubectl get pods
List pods
$ kubectl describe pods
Describe pods
$ kubectl logs $POD_NAME
View container logs
Troubleshooting with kubectl
kubectl get - list resources
kubectl describe - show detailed information about a resource
kubectl logs - print the logs from a container in a pod
kubectl exec - execute a command on a container in a pod
