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Minikube Overview

Minikube is a tool which allows you to run a single node Kubernetes cluster on a local machine or a VM. Minikube is easy to get setup and running, requiring only a few minutes as opposed to the complex install process and hardware required for a full-blown Kubernetes environment. Minikube can also be spun up and down in a faster manner, making it ideal for local debugging and testing for your infrastructure-as-code; however, it is not intended for Production use.

This step-by-step guide outlines the installation of Minikube using VirtualBox as the underlying hypervisor and Docker as the container runtime.

Pre-Requisites

List of requirements and versions used for this install guide.

Memory – 4GB (Default – 1GB)

CPU – 1 Core (Default)

OS – CentOS 7

Privileges – Root

VirtualBox – v6.0.4

Minikube – v0.34.1

Kubectl – v1.13

VirtualBox Installation

1.) In order to install VirtualBox, virtualization support must be enabled in the BIOS of the target system (your laptop, a VM, or even a target CentOS 7 server). Verify virtualization is enabled.

[ `egrep -c 'vmx|svm' /proc/cpuinfo` -eq  0 ] && { echo "Virtualization is not supported by the CPU, exiting.."; exit 1; }

2.) Disable selinux & stop firewall as needed.

setenforce 0
perl -pi -e 's/SELINUX\=enforcing/SELINUX\=disabled/g' /etc/selinux/config
systemctl stop firewalld
systemctl disable firewalld

3.) Install dependency packages required for VirtualBox.

/usr/bin/yum -y install binutils qt gcc make patch libgomp glibc-headers glibc-devel kernel-headers kernel-devel dkms bash-completion

4.) Download the VirtualBox yum repository definition and install and setup VirtualBox 6.0. Add the local root user to the vboxusers group to run the VirtualBox.

/usr/bin/wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo -O /etc/yum.repos.d/virtualbox.repo
/usr/bin/yum -y install VirtualBox-6.0

/usr/lib/virtualbox/vboxdrv.sh setup
usermod -a -G vboxusers root

5.) Next, download the 64 bit Minikube executable for Linux from the Google minikube file repository.

/usr/bin/curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 && chmod +x minikube

cp -p minikube /usr/local/bin && rm -f minikube

6.) Create the Kubernetes yum repository definition, install kubectl (Kubernetes CLI), and use kubectl to add auto-completion to your bash profile.

cat < /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
/usr/bin/yum -y install kubectl
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

7.) Start Minikube by invoking the Minikube executable, passing in --memory and --cpus arguments to set the memory and compute power of the Minikube VM as needed. We recommend setting memory to 4096 (4GB) and cpu to 2 cores. Set the no_proxy variable to allow the kubectl utility to connect directly to the IP of the Minikube VM. Using the Minikube executable, enable the Kubernetes dashboard to provide a UI for interacting with the encapsulated Kubernetes control plane and run a proxy on port 8001 to allow you to access the Kubernetes dashboard using your web browser. The --disable-filter=true argument allows all requests to access the dashboard without any filtering enabled.

minikube start --memory=4096 --cpus=2
export no_proxy=$no_proxy,$(minikube ip)
nohup kubectl proxy --address='0.0.0.0' --port=8001 --disable-filter=true &
sleep 30
minikube addons enable dashboard
nohup minikube dashboard &
minikube addons open dashboard

8.) Your Minikube-based Kubernetes instance is now running and accessible via the kubectl utility and the dashboard ui! You can access the Kubernetes dashboard using the following URL:

http://LINUX_IP:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/

9.) When you are done working with your Minikube instance, execute the commands below to cleanup Kubernetes and stop and delete Minikube.

/bin/kubectl delete deploy,svc --all
/usr/local/bin/minikube stop
/usr/local/bin/minikube delete

10.) A quick cheat sheet of helpful Minikube commands:

# set & get current context of cluster
 kubectl config use-context minikube
 kubectl config current-context

# fetch all the kubernetes objects for a namespace
 kubectl get all -n kube-system

# display cluster details
 kubectl cluster-info

# set custom memory and cpu 
 minikube config set memory 4096
 minikube config set cpus 2

# fetch cluster ip
 minikube ip

# ssh to the minikube vm
 minikube ssh

# display addons list and status
 minikube addons list

# exposes service to vm & retrieves url 
 minikube service elasticsearch
 minikube service elasticsearch --url

Summary

This guide gives you a quick set of steps that you can use to spin up a local Minikube instance for experimenting with Kubernetes and container orchestration. Minikube can be used to explore and understand the internals of Kubernetes and Docker Containers with a simple setup process and quick turnaround.

If you have questions on how you can best leverage our experience, would like further examples and/or need help with your Cloud-based environment, please engage us via comments on this blog post, or reach out to us at https://www.xtivia.com/contact/ or info@xtivia.com.

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