Prerequisites

Initializing LXD

If you never used LXD on your host, you need to initialize it: Ensure you have lxc version 4.0 and above; Note: These lxc instructions does not work in version 2.x

Note:

By default, if you have used multipass, lxd and lxc is already installed.

lxc --version
4.0.8

You may ignore if you already have lxc installed. You can skip the next step and directly go to creating storage pool Just a little notes on installing the right version on ubuntu 18.04, you will not need to execute below snippet if you are using ubuntu 20.04

sudo apt clean
sudo apt install -t xenial-backports lxd lxd-client
sudo apt update

Create a new storage pool, and select the backend to be dir, this is the only supported backend for this tutorial.

lxc storage create lxd-storage dir

You can now check the lxd storage by running:

ubuntu@k8s-hardway-18:~$ lxc storage list
+-------------+-------------+--------+----------------------------------------+---------+
|    NAME     | DESCRIPTION | DRIVER |                 SOURCE                 | USED BY |
+-------------+-------------+--------+----------------------------------------+---------+
| lxd-storage |             | dir    | /var/lib/lxd/storage-pools/lxd-storage | 0       |
+-------------+-------------+--------+----------------------------------------+---------+

You should see no containers created at this point.

Creating containers profiles

We will use a special profile to run our containers, since some components require special access to modules to run. This is not safe for a production environment, and should be used only for this lab. More info here.

create the profile configuration yaml with the following content:

cat <<EOF |tee kube-profile.yaml
config:
  limits.cpu: "2"
  limits.memory.swap: "false"
  boot.autostart: "false"
  linux.kernel_modules: ip_tables,ip6_tables,netlink_diag,nf_nat,overlay,br_netfilter
  raw.lxc: |
    lxc.apparmor.profile=unconfined
    lxc.mount.auto=proc:rw sys:rw cgroup:rw
    lxc.cgroup.devices.allow=a
    lxc.cap.drop=
  security.nesting: "true"
  security.privileged: "true"
description: ""
devices:
  aadisable:
    path: /sys/module/nf_conntrack/parameters/hashsize
    source: /dev/null
    type: disk
  aadisable1:
    path: /sys/module/apparmor/parameters/enabled
    source: /dev/null
    type: disk
EOF

Now create the profile:

 lxc profile create kube-profile

Set the profile with the properties from the yaml file:

cat kube-profile.yaml | lxc profile edit kube-profile

Check the profile content with:

lxc profile show kube-profile

Disable swap on your host:

sudo swapoff -a

Next: Installing the Client Tools