DNS issues when replacing /etc/resolv.conf symlink with static file

Bug #1957993 reported by af85
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
resolvconf (Ubuntu)
New
Undecided
Unassigned

Bug Description

I have been symlinking /etc/resolv.conf to a stub file generated using the resolvconf service (i believe this is default behavior). I just pushed a change to all the desktops under my control to remove this symlink, and manage /etc/resolv.conf as a static file. Immediately after, DNS resolution failed for about 1/3 of the desktops under my control. I was able to fix this by sending the "touch /etc/resolv.conf" command to all our desktops (via saltstack).

Further information:

OS: Ubuntu Focal 20.04
Kernel: 5.11.0-27-generic or 5.11.0-41-generic
Method of deploying changes: saltstack

Reproduce:

if [ -L /etc/resolv.conf ]
then
  unlink /etc/resolv.conf
fi
cat > /etc/resolv.conf <<EOF
nameserver xx.xx.xx.xx
nameserver yy.yy.yy.yy
domain example.com
search example.com
options ndots:2 timeout:1
EOF
ping google.com # fails
touch /etc/resolv.conf
ping google.com # succeeds

Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

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tags: added: bot-comment
af85 (af85)
affects: ubuntu → resolvconf (Ubuntu)
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