** Changed in: systemd (Ubuntu Xenial)
Status: Fix Committed => Incomplete
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https://bugs.launchpad.net/bugs/1649931
Title:
systemd-networkd needs to ensure DNS is up before network-
online.target
Status in resolvconf package in Ubuntu:
Fix Released
Status in systemd package in Ubuntu:
Fix Released
Status in resolvconf source package in Xenial:
Fix Released
Status in systemd source package in Xenial:
Incomplete
Status in resolvconf source package in Yakkety:
Fix Committed
Status in resolvconf package in Debian:
Fix Committed
Bug description:
Currently resolvconf and systemd-networkd don't ensure DNS has been
configured before allowing network-online.target to be reached.
This was discussed in https://launchpad.net/bugs/1636912 however it
was not a regression since there aren't any users of networkd + DNS
early in boot at this time, it was requested that we move this DNS
issue to a separate bug.
[SRU]
Fix: switch resolvconf.service to run Before=network-pre.target and add
Wants=network-pre.target. Add a Before=network-online.target to
systemd-networkd-resolvconf-update.service to ensure we update /etc/resolv.conf
with DNS config prior to reaching network-online.target.
Regression potential: Low. networkd is not widely being used outside
of netplan/snappy in xenial.
Test Case:
lxc launch ubuntu-daily:xenial x1
lxc exec x1 /bin/bash
# make sure you're on systemd-229-4ubuntu17
apt update && apt install -y systemd
# enable networkd and netplan
apt install -y nplan
cat <<EOF > /etc/netplan/nplan.yaml
network:
version: 2
ethernets:
all-en:
match:
name: "en*"
dhcp4: true
all-eth:
match:
name: "eth*"
dhcp4: true
EOF
sed -i.orig -e 's/^source/# source/' /etc/network/interfaces
netplan generate
# make sure cloud-init.service uses networkd
sed -i.orig -e '/After=networking.service/a
After=systemd-networkd-wait-online.service'
/lib/systemd/system/cloud-init.service
reboot
# check that the order of execution with:
journalctl -o short-precise --unit resolvconf.service --unit
network-online.target --unit systemd-networkd-wait-online.service --unit
systemd-networkd-resolvconf-update.service
# the order should be:
1. resolvconf: systemd[1]: Started Nameserver information manager.
2. systemd-networkd-wait-online.service: systemd[1]: Starting Wait for
Network to be Configured...
3. systemd-networkd-resolvconf-update.service: systemd[1]: Started Update
resolvconf for networkd DNS.
4. network-online.target: systemd[1]: Reached target Network is Online.
=== BAD OUTPUT ===
On a failing system, Reached target Network is Online occurs before (1, 2, or
3) above, like this output:
Dec 15 19:18:15.233443 x4 systemd[1]: Started Nameserver information manager.
Dec 15 19:18:15.797857 x4 systemd[1]: Starting Wait for Network to be
Configured...
Dec 15 19:18:15.799573 x4 systemd-networkd-wait-online[145]: ignoring: lo
Dec 15 19:18:15.804949 x4 systemd-networkd-wait-online[145]: ignoring: lo
Dec 15 19:18:15.805079 x4 systemd-networkd-wait-online[145]: ignoring: lo
Dec 15 19:18:29.100305 x4 systemd[1]: Starting Update resolvconf for networkd
DNS...
Dec 15 19:18:29.101870 x4 systemd[1]: Started Wait for Network to be
Configured.
Dec 15 19:18:29.102144 x4 systemd[1]: Reached target Network is Online.
Dec 15 19:18:29.212842 x4 systemd[1]: Started Update resolvconf for networkd
DNS.
=== GOOD OUTPUT ===
On a passing system, Reached target Network is Online occurs after 1, 2, and
3.
Dec 15 19:28:42.548545 x4 systemd[1]: Started Nameserver information manager.
Dec 15 19:28:43.144389 x4 systemd[1]: Starting Wait for Network to be
Configured...
Dec 15 19:28:43.146155 x4 systemd-networkd-wait-online[145]: ignoring: lo
Dec 15 19:28:56.081487 x4 systemd[1]: Started Wait for Network to be
Configured.
Dec 15 19:28:56.100353 x4 systemd[1]: Starting Update resolvconf for networkd
DNS...
Dec 15 19:28:56.124005 x4 systemd[1]: Started Update resolvconf for networkd
DNS.
Dec 15 19:28:56.124555 x4 systemd[1]: Reached target Network is Online.
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