Simple golang web server running on minikube

Mini project showing how to run very basic golang webserver in Kubernetes (minikube)

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Requirements

Minikube requires that VT-x/AMD-v virtualization is enabled in BIOS. To check that this is enabled on OSX / macOS run:

sysctl -a | grep machdep.cpu.features | grep VMX

If there's output, you're good!

Prerequisites

• kubectl
• docker (for Mac)
• minikube
• virtualbox

brew update && brew install kubectl && brew cask install docker minikube virtualbox

Start

minikube start

    This can take a while, expected output:
    Starting local Kubernetes v1.13.2 cluster...
    Starting VM...
    Getting VM IP address...
    Moving files into cluster...
    Setting up certs...
    Connecting to cluster...
    Setting up kubeconfig...
    Stopping extra container runtimes...
    Starting cluster components...
    Verifying kubelet health ...
    Verifying apiserver health ...
    Kubectl is now configured to use the cluster.
    Loading cached images from config file.

Check k8s

kubectl get nodes

Should output something like:

NAME       STATUS   ROLES    AGE   VERSION
minikube   Ready    master   88s   v1.13.2

Use minikube's built-in docker daemon:

eval $(minikube docker-env)

Add this line to .bash_profile or .zshrc or ... if you want to use minikube's daemon by default (or if you do not want to set this every time you open a new terminal).

You can revert back to the host docker daemon by running:

eval $(docker-machine env -u)

Enable ingress controller

minikube addons enable ingress

Clone git repo with Dockerfile and k8s deployment

git clone git@github.com:d-zalewski/gowebsrv-minikube.git
cd gowebsrv-minikube

Build go app image

docker build -t mygoapp:latest docker-image

Deploy mygoapp (pods,service,ingress)

kubectl apply -f k8s/mygoapp.yaml

Should output something like:

deployment.apps/mygoapp-deployment created
service/mygoapp-service created
ingress.extensions/mygoapp-ingress created

kubectl get pods

NAME                                  READY   STATUS    RESTARTS   AGE
mygoapp-deployment-6465ffbbcd-9q27w   1/1     Running   0          10s
mygoapp-deployment-6465ffbbcd-ntqc7   1/1     Running   0          10s
mygoapp-deployment-6465ffbbcd-xh5c7   1/1     Running   0          10s

kubectl get service

NAME              TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
kubernetes        ClusterIP   10.96.0.1      <none>        443/TCP   22m
mygoapp-service   ClusterIP   10.97.17.131   <none>        80/TCP    45s

kubectl get ingress

NAME              HOSTS   ADDRESS     PORTS   AGE
mygoapp-ingress   *       10.0.2.15   80      80s

Browse the go app

curl http://$(minikube ip)

You should see something like (container IDs will be changing on every few requests as the service is load balanced):

Hello World! Running on container ID mygoapp-deployment-6465ffbbcd-ntqc7%