Setup

Instructions for setting up a Kubernetes cluster.

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Local Kubernetes development with LXD

The purpose of using LXD on a local machine is to emulate the same deployment that a user would use in a cloud or bare metal. Each node is treated as a machine, with the same characteristics as production. Each node is a separate container, which runs Docker containers and kubectl inside (see Cluster Intro for more info).

Overview

Running Kubernetes locally has obvious development advantages, such as lower cost and faster iteration than constantly deploying and tearing down clusters on a public cloud. Ideally, a Kubernetes developer can spawn all necessary nodes inside local containers and test new configurations as they are committed. This page will show you how to deploy a cluster to LXD containers on a local machine.

Before you begin

Prerequisites

In order to simplify local deployment this method leverages the Conjure Up tool.

This will provide a pseudo-graphical set up in a terminal that is simple enough for developers to use without having to learn the complexities of operating Kubernetes. This will enable new developers to get started with a working cluster.

Getting Started

First, you need to configure LXD to be able to host a large number of containers. To do this we need to update the kernel parameters for inotify.

On your system open up /etc/sysctl.conf *(as root) and add the following lines:

    fs.inotify.max_user_instances = 1048576
    fs.inotify.max_queued_events = 1048576
    fs.inotify.max_user_watches = 1048576
    vm.max_map_count = 262144

Note: This step may become unnecessary in the future

Next, apply those kernel parameters (you should see the above options echoed back out to you):

sudo sysctl -p

Now you’re ready to install conjure-up and deploy Kubernetes.

    sudo snap install conjure-up --classic
    conjure-up kubernetes

Note: During this set up phase conjure-up will ask you to “Setup an ipv6 subnet” with LXD, ensure you answer NO. ipv6 with Juju/LXD is currently unsupported.

Walkthrough

Initiate the installation with:

conjure-up kubernetes

For this walkthrough we are going to create a new controller, select the localhost Cloud type:

Select Cloud

Deploy the applications:

Deploy Applications

Wait for Juju bootstrap to finish:

Bootstrap

Wait for our Applications to be fully deployed:

Waiting

Run the final post processing steps to automatically configure your Kubernetes environment:

Postprocessing

Review the final summary screen:

Final Summary

Accessing the Cluster

You can access your Kubernetes cluster by running the following:

~/kubectl --kubeconfig=~/.kube/config

Or if you’ve already run this once it’ll create a new config file as shown in the summary screen.

~/kubectl --kubeconfig=~/.kube/config.conjure-up

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