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Introduction

Intro to go here explaining LXD versus LXC and why you want to use it.

Setup 

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Images

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Cached Images in Image Store

List images currently cached in the image store. There should be none to start,

lxc image list

Image Servers

LXD has 3 image server lists by default,

Image Server LIstPurposeComment
ubuntu:Ubuntu stable images.We'll be working with this one.
ubuntu-daily:

images:All Linux distributions.For example you can load a RedHat Linux alternative distrobution.

Pulling Image Server Lists

Let's look at the ubuntu: list,

lxc image list ubuntu: | less
+--------------------+--------------+--------+-------------------------------------------------+---------+----------+-------------------------------+
|       ALIAS        | FINGERPRINT  | PUBLIC |                   DESCRIPTION                   |  ARCH   |   SIZE   |          UPLOAD DATE          |
+--------------------+--------------+--------+-------------------------------------------------+---------+----------+-------------------------------+
| p (5 more)         | 6041c5e200b6 | yes    | ubuntu 12.04 LTS amd64 (release) (20161205)     | x86_64  | 156.47MB | Dec 5, 2016 at 12:00am (UTC)  |
+--------------------+--------------+--------+-------------------------------------------------+---------+----------+-------------------------------+
| p/armhf (2 more)   | c19b1fff3336 | yes    | ubuntu 12.04 LTS armhf (release) (20161205)     | armv7l  | 135.19MB | Dec 5, 2016 at 12:00am (UTC)  |
+--------------------+--------------+--------+-------------------------------------------------+---------+----------+-------------------------------+
| p/i386 (2 more)    | ce5c6821eebb | yes    | ubuntu 12.04 LTS i386 (release) (20161205)      | i686    | 139.28MB | Dec 5, 2016 at 12:00am (UTC)  |
+--------------------+--------------+--------+-------------------------------------------------+---------+----------+-------------------------------+
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The output table from list is not very clear. I don't understand what to reference to use the "launch" command. Will put explanation here once figured out. Here is what I can tell,

Example "launch" Command ReferenceColumnNote
ubuntu:16.04

ubuntu:6041c5e200b6FINGERPRINTWill specifically reference the specific image in the list.g

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Spinning Up an LXD Container

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lxc launch ubuntu:16.04 container01

This command does the following simultaneously,

  1. References the ubuntu: Image Server List
    1. Looks for 16.01 images
    2. Matches the current architecture of the machine you are on (in my example 
  2. Checks the cache Image Store for the required image
  3. Download (if not in Image Store) the target image
  4. Setup Container called container01 with default settings
  5. Install the target image into container01
  6. Start container01

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References

Gives more details on initializing lxd - https://insights.ubuntu.com/2016/03/16/lxd-2-0-installing-and-configuring-lxd-212/

Official Ubuntu documentation - https://linuxcontainers.org/lxd/getting-started-cli/

Try Online Interactive Tutorial - https://linuxcontainers.org/lxd/try-it/

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