Public bug reported:

Hi,

Using manual provider on top of VMWare.

Juju: 2.9.14
VM: Focal
Containers: Bionic

I've noticed that, in a given Focal host, 2x Bionic containers may have
different behavior: one successfully completes cloud-init whereas the
other fails. The failed container errors at "apt update" in cloud-init
with:

Err:1 http://archive.ubuntu.com/ubuntu bionic InRelease
  Something wicked happened resolving 'PROXY_IP:<PORT>' (-9 - Address family 
for hostname not supported)
(Likely this is the line where it breaks: 
https://github.com/Debian/apt/blob/766b24b7f7484751950c76bc66d3d6cdeaf949a5/methods/connect.cc#L436)

Failed container, full cloud-init-output.log: 
https://pastebin.canonical.com/p/hKNw49mvJP/
Successful container, full cloud-init-output.log: 
https://pastebin.canonical.com/p/P6MZdQPrWd/
Host syslog: https://pastebin.canonical.com/p/jjMmWRFd9y/

I can see that, on the host, dnsmasq served the FAN IP to the broken
container after the "apt-update" was called.

----- FAILED CONTAINER -----:
Sep 19 13:02:14 lma-stack-2 dnsmasq-dhcp[1243]: DHCPOFFER(fan-252) 
252.252.15.198 00:16:3e:da:dd:c4 
apt-update on cloud-init was ran:
Cloud-init v. 21.2-3-g899bfaa9-0ubuntu2~18.04.1 running 'modules:config' at 
Sun, 19 Sep 2021 13:02:13 +0000. Up 3.90 seconds.


----- SUCCESSFUL CONTAINER -----:
Sep 19 13:09:40 lma-stack-2 dnsmasq-dhcp[1243]: DHCPOFFER(fan-252) 
252.252.15.253 00:16:3e:d7:6b:ef 
apt-update on cloud-init was ran:
Cloud-init v. 21.2-3-g899bfaa9-0ubuntu2~18.04.1 running 'modules:config' at 
Sun, 19 Sep 2021 13:10:10 +0000. Up 35.99 seconds.

In the case of the Failed Container, the DHCPOFFER arrived 1s after the
"apt update" was requested, whereas the Successful Container logged a
DHCPOFFER 30s before the "apt update".

** Affects: charm-rabbitmq-server
     Importance: Undecided
         Status: New

** Affects: juju
     Importance: Undecided
         Status: New

** Affects: ubuntu-fan (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: ubuntu-fan (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1944080

Title:
  [fan-network] Race-condition between "apt update" and dhcp request
  causes cloud-init error

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