*** This bug is a duplicate of bug 1907878 ***
https://bugs.launchpad.net/bugs/1907878
I've run into the same problem on a server upgraded from 18.04 to 20.04
and 22.04. After the last upgrade step, DNS did not work anymore. It
seems that DNS information does not get properly propagated from
ifupdown configuration (/etc/network/interfaces) to systemd-resolved.
The main issue seems to be this error:
```
/etc/network/if-up.d/resolved: 70: DNS: not found
```
It seems that the state files e.g. /run/network/ifupdown-inet-eth0 contain the
following string:
```
"DNS"="<ip-of-dns>"
When the script tries to source the file around line 78, this fails. I
fixed it by removing the quotes around $DNS and $DOMAINS on line 47 and
51.
--
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Touch seeded packages, which is subscribed to ifupdown in Ubuntu.
https://bugs.launchpad.net/bugs/1910273
Title:
Upgrade to groovy breaks DNS resolution
Status in ifupdown package in Ubuntu:
Confirmed
Bug description:
~# lsb_release -rd
Description: Ubuntu 20.10
Release: 20.10
~# apt-cache policy ifupdown
ifupdown:
Instalēts: 0.8.35ubuntu2
Kandidāts: 0.8.35ubuntu2
Versiju tabula:
*** 0.8.35ubuntu2 500
500 http://mirrors.digitalocean.com/ubuntu groovy/universe amd64
Packages
100 /var/lib/dpkg/status
~#
Problem: Upon upgrade from Ubuntu 20.04 to Ubuntu 20.10, I expected
name resolution upon reboot to work as usual.
What happened:
a) /var/log/syslog sprinkled with error messages:
- /etc/network/if-up.d/resolved: 12: mystatedir: not found
- /etc/network/if-up.d/resolved: 70: DNS: not found
- /etc/network/if-up.d/resolved: 1: /run/network/ifupdown-inet-eth0:
DNS=8.8.8.8 8.8.4.4: not found
b) resolvectl dns returning no name servers
Investigation:
Recently changed /etc/network/if-up.d/resolved and
/etc/network/if-down.d/resolved files contain programming errors. See
https://git.launchpad.net/ubuntu/+source/ifupdown/commit/?id=54fec5eedfd59adaffe9021c271914578dd05d1b
.
Fix:
$ diff
/Users/pklavins/Downloads/ifupdown-0.8.35ubuntu2/debian/if-down.d/resolved
if-down.d_resolved
12c12
< mystatedir statedir ifindex interface
---
> # local mystatedir statedir ifindex interface
$ diff
/Users/pklavins/Downloads/ifupdown-0.8.35ubuntu2/debian/if-up.d/resolved
if-up.d_resolved
12c12
< mystatedir statedir ifindex interface
---
> # local mystatedir statedir ifindex interface
39,40c39,40
< DNS=DNS
< DOMAINS=DOMAINS
---
> DNS=$DNS
> DOMAINS=$DOMAINS
42,43c42,43
< DNS=DNS6
< DOMAINS=DOMAINS6
---
> DNS=$DNS6
> DOMAINS=$DOMAINS6
47c47
< "$DNS"="$NEW_DNS"
---
> DNS="$NEW_DNS"
51c51
< "$DOMAINS"="$NEW_DOMAINS"
---
> DOMAINS="$NEW_DOMAINS"
70c70
< DNS DNS6 DOMAINS DOMAINS6 DEFAULT_ROUTE
---
> # local DNS DNS6 DOMAINS DOMAINS6 DEFAULT_ROUTE
$
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