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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