Sakananote: Kubernetes In Docker For Mac

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Sakananote: Kubernetes In Docker For Mac 3,5/5 3825 reviews

This is a step-by-step guide to installing and running Kubernetes on your Mac so that you can develop applications locally.

Table of contents

Kubernetes and Docker. Kubernetes is a system that automates the deployment, scaling, and management of containerized applications. Containerizing an application requires a base image that can be used to create an instance of a container. Docker for Mac 18.01.0 CE is available for the general public. It holds experimental Kubernetes release running on Linux Kernel 4.9.75, Docker Compose 1.180 and Docker Machine 0.13.0. It is available only under Edge Release. Please note that this feature is still NOT available under Stable Release branch.

  • Get started with Docker for Mac

Pre-requisite

The only pre-requisite for this guide is that you have Homebrew installed. Homebrew is a package manager for the Mac. You’ll also need Homebrew Cask, which you can install after Homebrew by running brew tap caskroom/cask in your Terminal.

Requirements

Docker for Mac is the current release of Docker for OSX. Requirements:

  • Mac must be 2010 or new model with Intel's hardare support for memory management unit (MMU, virtualization, and Unrestricted mode.
  • OSX El Capital 10.11 and newer releases are supported.
  • Virtualbox prior to version 4.3.30 must NOT be installed. It is incompatiable. Use a newer version.

Install Docker for Mac (Manually)

Docker for Mac can be downloaded here.

Install Docker Toolbox

You can use Homebrew and Homebrew Cask to install Docker Toolbox which is a collection of useful docker tools such as docker-compose, docker-machine and Kitematic.

You can find more about docker follow the documentation here.

Starting Docker

If everything works, you should have the following commands available:

Troubleshooting

If you get an error like the one below, you might need to start the Docker daemon.

To start the Docker daemon, it probably needs one of these commands

Enabling on startup

For Arch Linux, Ubuntu and CentOS, this will enable auto-starting of the Docker service:

Docker Toolbox Quick Start

For quick start find the Docker Quickstart Terminal and double click to launch it. Then you start the hello world container using:

Enable Kubernetes in Docker for Mac

Kubernetes is not enabled by default. To enable it, click on the Docker icon, go to Preferences Kubernetes, select the Enable Kubernetes checkbox and hit Apply.

After a few minutes, Kubernetes will be enabled, as reflected by the green statuses at the bottom of the preferences dialog.

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This is a step-by-step guide to installing and running Kubernetes on your Mac so that you can develop applications locally.

You will be guided through running and accessing a Kubernetes cluster on your local machine using the following tools:

  • Homebrew
  • Docker for Mac
  • Minikube
  • virtualbox
  • kubectl
Kubernetes

Installation Guide

The only pre-requisite for this guide is that you have Homebrew installed. Homebrew is a package manager for the Mac. You’ll also need Homebrew Cask, which you can install after Homebrew by running brew tap caskroom/cask in your Terminal.

  1. Install Docker for Mac. Docker is used to create, manage, and run our containers. It lets us construct containers that will run in Kubernetes Pods.

  2. Install VirtualBox for Mac using Homebrew. Run brew cask install virtualbox in your Terminal. VirtualBox lets you run virtual machines on your Mac (like running Windows inside macOS, except for a Kubernetes cluster.)

    Skip to step three if everything has worked to this point.

    In my case, I already had the non-Homebrew VirtualBox app installed which caused issues when trying to start minikube.

    If you already have VirtualBox installed, start the installation as before with brew cask install virtualbox. You will get a warning that confirms this saying Warning: Cask 'virtualbox' is already installed.. Once this is confirmed, you can reinstall VirtualBox with Homebrew by running brew cask reinstall virtualbox.

    If you happen to have VirtualBox already running when you do this, you could see an error saying Failed to unload org.virtualbox.kext.VBoxDrv - (libkern/kext) kext is in use or retained (cannot unload).

    This is because the kernel extensions that VirtualBox uses were in use when the uninstall occurred. If you scroll up in the output of that command, beneath Warning! Found the following active VirtualBox processes: you’ll see a list of the processes that need to be killed.

    Kill each of these in turn by running kill first_column_number (first_column_number is the process identifier for that process).

    Now re-run brew cask reinstall virtualbox and it should succeed.

  3. Install kubectl for Mac. This is the command-line interface that lets you interact with Kuberentes. Run brew install kubectl in your Terminal.

  4. Install Minikube via the Installation > OSX instructions from the latest release. At the time of writing, this meant running the following command in Terminal…

    Minikube will run a Kubernetes cluster with a single node.

  5. Everything should work! Start your Minikube cluster with minikube start. Then run kubectl api-versions. If you see a list of versions, everything’s working! minikube start might take a few minutes.

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  6. At this point, I got an error saying Error starting host: Error getting state for host: machine does not exist. because I had previously tried to run Minikube. You can fix this by running open ~/.minikube/ to open Minikube’s data files, and then deleting and deleting the machines directory. Then run minikube start again.

Come Together

You’ve installed all these tools and everything looks like it’s working. A quick explanation of how the components relate is needed.

  • VirtualBox is a generic tool for running virtual machines. You can use it to run Ubuntu, Windows, etc. inside your macOS operating system host.
  • Minikube is a Kubernetes-specific package that runs a Kubernetes cluster on your machine. That cluster has a single node and has some unique features that make it more suitable for local development. Minikube tells VirtualBox to run. Minikube can use other virtualization tools—not just VirtualBox—however these require extra configuration.
  • kubectl is the command line application that lets you interact with your Minikube Kubernetes cluster. It sends request to the Kubernetes API server running on the cluser to manage your Kubernetes environment. kubectl is like any other application that runs on your Mac—it just makes HTTP requests to the Kubernetes API on the cluster.