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LXD init will configure a bridge. In order to say yes to this you must have the bridge utils installed. In this article we covered that so say yes and then you will be prompted with a "text ui" interface,

Do you want to configure the LXD bridge (yes/no) [default=yes]?

 You will be prompted with a "text ui" interface. ...

Pretty much first set are defaults. Will add notes about ZFS. Should explain loop device here too. Note Roderick using Azure Ubuntu 16.10 has simpler following screens,

Name of the storage backend to use (dir or zfs) [default=zfs]: zfs
Create a new ZFS pool (yes/no) [default=yes]? yes
Name of the new ZFS pool [default=lxd]: lxd
Would you like to use an existing block device (yes/no) [default=no]? no
Size in GB of the new loop device (1GB minimum) [default=15]: 15
Would you like LXD to be available over the network (yes/no) [default=no]? no
Would you like stale cached images to be updated automatically (yes/no) [default=yes]? yes
Would you like to create a new network bridge (yes/no) [default=yes]? yes
What should the new bridge be called [default=lxdbr0]? lxdbr0
What IPv4 subnet should be used (CIDR notation, "auto" or "none") [default=auto]? auto
What IPv6 subnet should be used (CIDR notation, "auto" or "none") [default=auto]? auto
LXD has been successfully configured.

Tin using Ubuntu 16.04.1

Name of the new ZFS pool [default=lxd]: lxd
Would you like to use an existing block device (yes/no) [default=no]? no
Size in GB of the new loop device (1GB minimum) [default=15]: 15
Would you like LXD to be available over the network (yes/no) [default=no]? no
Would you like stale cached images to be updated automatically (yes/no) [default=yes]? yes
Would you like to create a new network bridge (yes/no) [default=yes]? yes
What should the new bridge be called [default=lxdbr0]? lxdbr0
What IPv4 subnet should be used (CIDR notation, "auto" or "none") [default=auto]? auto
What IPv6 subnet should be used (CIDR notation, "auto" or "none") [default=auto]? auto
LXD has been successfully configured.

After saying yes to the new network bridge here are the answers to the texts graphical sub prompts,

Would you like to create a new network bridge (yes/no) [default=yes]? <yes>
What should the new bridge be called [default=lxdbr0]? <Ok>
Do you want to setup an IPv4 subnet? <yes>

This subnet was selected for your convenience and next questions have been pre-answered accodingly. Please make sure this subnet isn't already in use somewhere on your network, if it is, change it to one which isn't. If you later notice network connectivity issues, re-configure lxd and pick a different subnet.
<Ok>

# resulting IPv4 address will vary in this example using VMWare fusion it is 10.232.27.1
<Ok>
... all sorts of things... need to redo this.

Use your arrow keys to pick the buttons.

Introduction,

The default bridge name is lxdbr0. It's just a name but suggest you leave as default. To get to the button, use the down arrow key,

Go with IPv4 unless you have some special need to use IPv6,

You will be assigned a random subnet. For the purposes of this article, think of a subnet as a way of naming your postal code. It's the difference between Canada and US postal code. When given time I'll provide more description and write or link to a good article on subnets,

IPv4 address. This prompt is not very clear. Going to go back and check shortly. It is either reserving this IP address or asking you for a sample to determine the subnet.

A valid CIDR mask. (e.g. 24),

Initial IP Address Range does not matter unless you want to use a lot of static IP addresses. I need to think about this a bit more... the idealism behind cloud is not require static, but reality (at least for now), I still find static useful and in some application designs (stateful apps, older PKI's... ect...) absolutely necessary.

Pick default for the last address,

The DHCP leas number should be default unless you went and changed the range. If so you should adjust to match. Yeah I know the numbers do not add up (254 - 2 = 252) but I believe there is some fancy math for that... look up and link to my LXC articles.

For almost all networks this will be Yes. Tin google or to talk to Dickson or Andrew though at some point to put explanations here.

Unless you really need IPv6 say no,

After this you will be taken out of the Text UI. The warning message is due to network bridge setup,

Warning: Stopping lxd.service, but it can still be activated by:
  lxd.socket
LXD has been successfully configured.

I hate doing this in Linux, but let's reboot to make sure the lxd service is ok,

sudo reboot

Reconfigure

If you need to reconfigure the bridge you can by using this command.

sudo dpkg-reconfigure -p medium lxd

Basic LXD Commands

You no longer need root, but users must be added to the lxd group to run the lxc commands.

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