Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ifupdown (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1981103
Title:
System with DNS server in /etc/network/interfaces has bogus systemd-
resolved config after upgrade to 22.04
Status in ifupdown package in Ubuntu:
Confirmed
Bug description:
Description: Ubuntu 22.04 LTS
Release: 22.04
ifupdown:
Installed: 0.8.36+nmu1ubuntu3
Candidate: 0.8.36+nmu1ubuntu3
Version table:
*** 0.8.36+nmu1ubuntu3 500
500 http://de.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
100 /var/lib/dpkg/status
After upgrading a server with classic ifupdown configuration after
reboot the machine had no valid dns servers anymore.
The problem is that the state file created by ifupdown using
/etc/network/if-up.d/resolved looks like this:
root@pangaea-pm:~# cat /run/network/ifupdown-inet-ens13
"DNS"="134.102.20.20 134.102.200.14"
"DOMAINS"="marum.de"
The script later sources this file and causes the following errors,
easy to see when you execute this:
root@pangaea-pm:~# ifdown ens13; ifup ens13
/etc/network/if-down.d/resolved: 12: mystatedir: not found
/etc/network/if-up.d/resolved: 12: mystatedir: not found
/etc/network/if-up.d/resolved: 71: DNS: not found
/etc/network/if-up.d/resolved: 1: /run/network/ifupdown-inet-ens13:
DNS=134.102.20.20 134.102.200.14: not found
/etc/network/if-up.d/resolved: 2: /run/network/ifupdown-inet-ens13:
DOMAINS=marum.de: not found
Failed to parse DNS server address: DNS
Failed to set DNS configuration: Invalid argument
This happened to me on three different servers, so this is a serious
bug and should be fixed before 22.04 upgrades are allowed for
everybody. Most servers provided by data centers like Hetzner
(Germany) are configure like that. After a do-release-upgrade you have
no working DNS anymore, unless you disable systemd-resolved. I don't
want to use netplan, so changing to this is no option.
The fix is easy - remove the quotes in the script on the left side
"$DNS" => $DNS; same for DOMAINS:
if [ -n "$NEW_DNS" ]; then
cat <<EOF >"$mystatedir/ifupdown-${ADDRFAM}-$interface"
$DNS="$NEW_DNS"
EOF
if [ -n "$NEW_DOMAINS" ]; then
cat <<EOF >>"$mystatedir/ifupdown-${ADDRFAM}-$interface"
$DOMAINS="$NEW_DOMAINS"
EOF
fi
fi
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