[Bug 1664818] Re: Not possible to render pre-up, pre-down, post-up, or post-down snippets

[Nick Rosbrook]

It does not sound like there is anything for us to do on systemd. If
someone is still interested in a related feature request, please open an
RFE with upstream:
https://github.com/systemd/systemd/labels/RFE%20%F0%9F%8E%81.

** Changed in: systemd (Ubuntu)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1664818

Title:
  Not possible to render pre-up, pre-down, post-up, or post-down
  snippets

Status in netplan:
  Fix Committed
Status in systemd package in Ubuntu:
  Won't Fix

Bug description:
  Many configurations require scripts to run before or after an
  interface comes up or down.

  Example: I had a situation where I needed to render a post-up script
  to monitor an interface with ifupdown (and with the interface set to
  manual mode, because if the link was down I didn't want to require
  DHCP to run before the system continued booting). This is similar to
  what NetworkManager does in order to launch (or kill) a DHCP client.

  Other use cases involve setting up custom routes (such as when complex
  logic involving metrics or source routing is required) or anything
  else the designers of the netplan rendering engine didn't think of,
  such as invoking workarounds or special settings required for a
  particular NIC or environment, iptables rules that should be added or
  removed, etc.

  A follow-on issue is, it should be possible to ask that custom scripts
  run if the *link* is detected to come up or down. But I'll be happy if
  netplan first can simply replicate the custom-script-invoking behavior
  of ifupdown.

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