7.5 KiB
Using Kubernetes for Local Development — Minikube
If you ops team are using Docker and Kubernetes, it is recommended to adopt the same or similar technologies in development. This will reduce the number of incompatibility and portability problems and makes everyone consider the application container a common responsibility of both Dev and Ops teams.
This blog post introduces the usage of Kubernetes in development mode and it is inspired from a screencast that you can find in Painless Docker Course.
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Minikube is a tool that makes developers’ life easy by allowing them to use and run a Kubernetes cluster in a local machine.
In this blog post, for the examples that I tested, I am using Linux Mint 18, but it doesn’t change nothing apart the installation part.
cat /etc/lsb-release
DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=18.1
DISTRIB_CODENAME=serena
DISTRIB_DESCRIPTION=”Linux Mint 18.1 Serena”
Prerequisites
In order to work with Minkube, we should have Kubectl and Minikube installed + some virtualization drivers.
- For OS X, install xhyve driver, VirtualBox, or VMware Fusion, then Kubectl and Minkube
curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/darwin/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
curl -Lo minikube https://storage.googleapis.com/minikube/releases/v0.21.0/minikube-darwin-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/
- For Windows, install VirtualBox or Hyper-V then Kubectl and Minkube
curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.7.0/bin/windows/amd64/kubectl.exe
Add the binary to your PATH (This article explains how to modify the PATH)
Download the minikube-windows-amd64.exe file, rename it to minikube.exeand add it to your path.
Find the last release here.
- For Linux, install VirtualBox or KVM then Kubectl and Minkube
curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl
curl -Lo minikube https://storage.googleapis.com/minikube/releases/v0.21.0/minikube-linux-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/
Using Minikube
Let’s start by creating an image from this Dockerfile:
FROM busybox
ADD index.html /www/index.html
EXPOSE 8000
CMD httpd -p 8000 -h /www; tail -f /dev/null
Add something you’d like to see in the index.html page.
Build the image:
docker build -t eon01/hello-world-web-server .
Let’s run the container to test it:
docker run -d --name webserver -p 8000:8000 eon01/hello-world-web-server
This is the output of docker ps:
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2ad8d688d812 eon01/hello-world-web-server "/bin/sh -c 'httpd..." 3 seconds ago Up 2 seconds 0.0.0.0:8000->8000/tcp webserver
Let’s commit the image and upload it to the public Docker Hub. You can use your own private registry:
docker commit webserver
docker push eon01/hello-world-web-server
Remove the container since we will use it with Minikube
docker rm -f webserver
Time to start Minikube:
minkube start
Check the status:
minikube status
We are running a single node:
kubectl get node
Run the webserver:
kubectl run webserver --image=eon01/hello-world-web-server --port=8000
A webserver should have it’s port exposed:
kubectl expose deployment webserver --type=NodePort
In order to get the service url type:
minikube service webserver --url
We can see the content of the web page using :
curl $(minikube service webserver --url)
To show a summary of the running cluster run:
kubectl cluster-info
For more details:
kubectl cluster-info dump
We can also list the pods using:
kubectl get pods
And to access to the dashboard use:
minikube dashboard
If you would like to access the frontend of the web application type:
kubectl proxy
If we want to execute a command inside the container, get the pod id using:
kubetctl get pods
Then use it like :
kubectl exec webserver-2022867364-0v1p9 -it -- /bin/sh
To finish, delete all deployments:
kubectl delete deployments --all
Delete all pods:
kubectl delete pods --all
And stop Minikube
minikube stop
I hope you enjoyed this introduction.
Connect Deeper
If you resonated with this article, you can find more interesting contents in Painless Docker Course.
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作者简介：
Aymen El Amri Cloud & Software Architect, Entrepreneur, Author, CEO www.eralabs.io, Founder www.devopslinks.com, Personal Page : www.aymenelamri.com
via: https://medium.com/devopslinks/using-kubernetes-minikube-for-local-development-c37c6e56e3db
作者：Aymen El Amri 译者：译者ID 校对：校对者ID