Curl: (6) Could not resolve host: raw.githubusercontent.com (LXD/lxdMosaic)

LXD
1

I have initalized LXD on my local Ubuntu 21.04 box with the following setting:

$ lxd init
Would you like to use LXD clustering? (yes/no) [default=no]:
Do you want to configure a new storage pool? (yes/no) [default=yes]:
Name of the new storage pool [default=default]:
Name of the storage backend to use (btrfs, dir, lvm, zfs, ceph) [default=zfs]: btrfs
Create a new BTRFS pool? (yes/no) [default=yes]:
Would you like to use an existing empty block device (e.g. a disk or partition)? (yes/no) [default=no]:
Size in GB of the new loop device (1GB minimum) [default=30GB]:    
Would you like to connect to a MAAS server? (yes/no) [default=no]:
Would you like to create a new local network bridge? (yes/no) [default=yes]:
What should the new bridge be called? [default=lxdbr0]:
What IPv4 address should be used? (CIDR subnet notation, “auto” or “none”) [default=auto]:
What IPv6 address should be used? (CIDR subnet notation, “auto” or “none”) [default=auto]:
Would you like the LXD server to be available over the network? (yes/no) [default=no]:
Would you like stale cached images to be updated automatically? (yes/no) [default=yes]
Would you like a YAML "lxd init" preseed to be printed? (yes/no) [default=no]:
$

I have followed this guide:

to setup LxdMosaic and executed:

lxc config set core.https_address [::]
lxc config set core.trust_password some-secret-string #remember this you will be asked later

but get this error inside the container:

root@lxdMosaic:~# curl https://raw.githubusercontent.com/turtle0x1/LxdMosaic/master/examples/install_with_clone.sh >> installLxdMosaic.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:09 --:--:--     0curl: (6) Could not resolve host: raw.githubusercontent.com

root@lxdMosaic:~# curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.21.1/bin/linux/amd64/kubectl
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:09 --:--:--     0curl: (6) Could not resolve host: storage.googleapis.com

So seems I cannot call out from the container. Another example based on:

https://linuxcontainers.org/lxd/getting-started-cli/#run-command-from-host-terminal

$ lxc launch ubuntu:20.04 ubuntuone
Creating ubuntuone
Starting ubuntuone

$ lxc list
+-----------+---------+------+----------------------------------------------+-----------+-----------+
|   NAME    |  STATE  | IPV4 |                     IPV6                     |   TYPE    | SNAPSHOTS |
+-----------+---------+------+----------------------------------------------+-----------+-----------+
| lxdMosaic | RUNNING |      | fd42:94d8:34c:38f8:216:3eff:fec2:891b (eth0) | CONTAINER | 0         |
+-----------+---------+------+----------------------------------------------+-----------+-----------+
| ubuntuone | RUNNING |      | fd42:94d8:34c:38f8:216:3eff:fe7b:4ed5 (eth0) | CONTAINER | 0         |
+-----------+---------+------+----------------------------------------------+-----------+-----------+

$ lxc exec ubuntuone bash
root@ubuntuone:~# apt-get update
Err:1 http://archive.ubuntu.com/ubuntu focal InRelease                   
  Temporary failure resolving 'archive.ubuntu.com'
Err:2 http://security.ubuntu.com/ubuntu focal-security InRelease         
  Temporary failure resolving 'security.ubuntu.com'
0% [Working]^C

What basic configuration am I missing and how to debug/fix?

UPDATE:

If I disable ufw it works:

$ sudo ufw status
Status: active

$ sudo ufw disable
Firewall stopped and disabled on system startup

$ sudo ufw status
Status: inactive

$ lxc exec ubuntuone bash
root@ubuntuone:~# apt-get update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
...
Get:39 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 c-n-f Metadata [644 B]
Get:40 http://archive.ubuntu.com/ubuntu focal-backports/multiverse amd64 c-n-f Metadata [116 B]
Fetched 20.9 MB in 3s (6659 kB/s)               
Reading package lists... Done

But I actually want/need yo have that running. Is it a requirement for using LXD that ufw is disabled? Never had an issue with having that running when using docker (and running similar tasks). Part of debugging this issue I uninstalled docker but eventually I will re-install it.

2

For now I am using this solution: