This bug was fixed in the package ifupdown - 0.8.36+nmu1ubuntu4.1
---------------
ifupdown (0.8.36+nmu1ubuntu4.1) lunar; urgency=medium
[ Uwe Kleine-König ]
* Fix if-up.d/resolved hook to properly work with nameservers and search
domains (LP: #1981103)
-- Heitor Alves de Siqueira <[email protected]> Mon, 16 Oct 2023
14:34:24 +0000
** Changed in: ifupdown (Ubuntu Lunar)
Status: Fix Committed => Fix Released
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ifupdown in Ubuntu.
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:
Fix Released
Status in ifupdown source package in Focal:
Fix Released
Status in ifupdown source package in Jammy:
Fix Released
Status in ifupdown source package in Lunar:
Fix Released
Bug description:
[ Impact ]
ifupdown configurations will stop having a working DNS server on upgrade
[ Test Plan ]
Upgrading from an Ubuntu 18.04 or earlier release, bounce a network interface
with configured DNS server:
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 should result in no errors, and in a valid network configuration with
working DNS resolution.
It's likely that existing netplan configuration needs to be removed and
migrated to classic ifupdown scripts before running the test above.
[ Where problems could occur ]
Although we're only fixing the resolved scripts, more complex network setups
might see regressions in DNS resolution for some cases. We should pay special
attention to bridges or virtual interfaces that have been configured through
ifupdown, as well as validate the other scripts under /etc/network/if-up.d/
[ Other Info ]
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1981103/+subscriptions
--
Mailing list: https://launchpad.net/~touch-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
