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[Scott Moser <ssmoser2+ubuntu@xxxxxxxxx>]

Older versions of cloud init only supported the apt_proxy setting. Newer
versions support the newer 'apt' top level key. They also convert
support the old format.

Documentation that comes in the package installed will mention the older
in example. We just did not use rtd in 0.7.5 so you won't find doc on
that there.

Sorry, but this is just kind of the way it is.

Not all function has always been supported.

You're welcome to use the old format with 16.04.

** Changed in: cloud-init
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1727527

Title:
  cloud-init 0.7.5 doesn't honor the apt: proxy: setting, needs
  apt_proxy instead

Status in cloud-init:
  Invalid

Bug description:
  When passing a profile with an apt proxy defined in cloud-config data,
  it isn't honored for Ubuntu 14.04, but it is for 16.04 and 17.10 (I've
  only tried those).

  Steps to reproduce:

  This uses lxd as I initially ran into this while trying to have a
  profile that would automatically set up the proxy for my containers.

  Assuming you have an apt-cacher-ng or similar at 1.2.3.4:

  lxc profile create aptcache2
  cat << EOF | lxc profile edit aptcache2
  name: aptcache
  description: set up apt caching via 1.2.3.4
  config:
    user.vendor-data: |
      #cloud-config
      apt:
        proxy: "http://1.2.3.4:3142";
  EOF

  lxc launch -p default -p aptcache2 ubuntu:14.04 y-u-no-cache
  lxc launch -p default -p aptcache2 ubuntu:16.04 i-do-cache

  lxc exec y-u-no-cache -- grep -r 3142 /etc/apt/apt.conf.d
  lxc exec i-do-cache -- grep -r 3142 /etc/apt/apt.conf.d

  Expected result:
  Both lxc exec commands should show something like:

  /etc/apt/apt.conf.d/90cloud-init-aptproxy:Acquire::http::Proxy
  "http://1.2.3.4:3142";;

  Actual result:
  Only the command on the 16.04 container shows this, the other container has no proxy settings.

  The 14.04 image has cloud-init Installed: 0.7.5-0ubuntu1.22
  The 16.04 image has Installed: 0.7.9-233-ge586fe35-0ubuntu1~16.04.2

  
  Stéphane Graber pointed out that 0.7.5 supports this syntax:

  user.vendor-data: |
      #cloud-config
      apt_proxy: "http://1.2.3.4:3142";

  I didn't find any documentation on that when I went looking, current
  cloud-init documentation only mentions the apt: proxy: thing:

  http://cloudinit.readthedocs.io/en/latest/topics/examples.html
  #additional-apt-configuration

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