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Ubuntu Core 16 images using cloud-init fail to function when the
DataSource is over the network (Like OpenStack) as networking is not yet
available when cloud-init.service runs.
cloud-init service unit deps look like this:
[Unit]
Description=Initial cloud-init job (metadata service crawler)
DefaultDependencies=no
Wants=cloud-init-local.service
Wants=local-fs.target
Wants=sshd-keygen.service
Wants=sshd.service
After=cloud-init-local.service
After=networking.service
Requires=networking.service
Before=basic.target
Before=dbus.socket
Before=network-online.target
Before=sshd-keygen.service
Before=sshd.service
Before=systemd-user-sessions.service
Conflicts=shutdown.target
Here's networkd unit deps:
[Unit]
Description=Network Service
Documentation=man:systemd-networkd.service(8)
ConditionCapability=CAP_NET_ADMIN
DefaultDependencies=no
# dbus.service can be dropped once on kdbus, and systemd-udevd.service can be
# dropped once tuntap is moved to netlink
After=systemd-udevd.service dbus.service network-pre.target
systemd-sysusers.service systemd-sysctl.service
Before=network.target multi-user.target shutdown.target
Conflicts=shutdown.target
Wants=network.target
# On kdbus systems we pull in the busname explicitly, because it
# carries policy that allows the daemon to acquire its name.
Wants=org.freedesktop.network1.busname
After=org.freedesktop.network1.busname
And a critical-chain output:
root@snap-test7:~# systemd-analyze critical-chain systemd-networkd
Failed to get ID: Unit name systemd-networkd is not valid.
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.
root@snap-test7:~# systemd-analyze critical-chain systemd-networkd.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.
systemd-networkd.service +440ms
└─dbus.service @11.461s
└─basic.target @11.403s
└─sockets.target @11.401s
└─dbus.socket @11.398s
└─cloud-init.service @10.127s +1.266s
└─networking.service @9.305s +799ms
└─network-pre.target @9.295s
└─cloud-init-local.service @3.822s +5.469s
└─local-fs.target @3.813s
└─run-cgmanager-fs.mount @12.687s
└─local-fs-pre.target @1.393s
└─systemd-tmpfiles-setup-dev.service @1.116s +195ms
└─kmod-static-nodes.service @887ms +193ms
└─system.slice @783ms
└─-.slice @721ms
cloud-init would need networkd to run at or before 'networking.service'
so it can raise networking to then find and use network-based
datasources.
# grep systemd /usr/share/snappy/dpkg.list
ii libnss-resolve:amd64 229-4ubuntu11
amd64 nss module to resolve names via systemd-resolved
ii libpam-systemd:amd64 229-4ubuntu11
amd64 system and service manager - PAM module
ii libsystemd0:amd64 229-4ubuntu11
amd64 systemd utility library
ii systemd 229-4ubuntu11
amd64 system and service manager
ii systemd-sysv 229-4ubuntu11
amd64 system and service manager - SysV links
# grep cloud-init /usr/share/snappy/dpkg.list
ii cloud-init
0.7.8-201610260005-gf7a5756-0ubuntu1~trunk~ubuntu16.04.1 all Init
scripts for cloud instances
SRU INFORMATION FOR systemd
===========================
Fix: For xenial it is sufficient to drop systemd-networkd's After=dbus.service
(https://github.com/systemd/systemd/commit/5f004d1e32) and (for xenial only)
drop the useless org.freedesktop.network1.busname unit (which is always
"condition failed" as there is no kdbus, but it moves systemd-network.service
after sockets.target which is too late for cloud-init).
Regression potential: Low. networkd is not widely being used outside of
netplan/snappy in xenial. Running it before dbus.service is running has two
consequences:
- It cannot immediately expose its D-Bus status interface. But it will retry
every 5 s until that succeeds, so the D-Bus status interface will continue to
work. (see test case)
- If a DHCP response with a hostname or timezone is received before
dbus.service is running, it cannot talk to systemd-hostnamed/systemd-timedated
to set these properties (if enabled). However, this is broken in xenial anyway
as it fails on polkit permissions (this and retrying this configuration after
D-Bus is up has been fixed in upstream master now).
As for removing the "*.busname" units in xenial: kdbus has never been
part of any distribiution, there had just been some experimental DKMS
package in some PPA for it. It's dead as an upstream project, so by
dropping the *.busname unit(s) from xenial there should be no practical
effect as these should always not start with "condition failed".
Yakkety's systemd already has them removed.
Test case:
- Install nplan, set up a netplan configuration and remove
/etc/network/interfaces.
- Upgrade to the proposed packages.
- Ensure that the network is still functional and "busctl" shows
org.freedesktop.network1, i. e. networkd successfully connected to the bus.
- Check the journal that systemd-networkd.service starts before dbus.service,
which should usually be the case with this fix. Check "journalctl -b" for
"Started Network Service." vs. "Started D-Bus System Message Bus."
If it repeatedly starts the other way around, you can force it with "sudo
systemctl edit systemd-networkd.service" and
[Unit]
Before=sysinit.target
(This is effectively what cloud-init.service will do soon.)
** Affects: systemd
Importance: Unknown
Status: Fix Released
** Affects: cloud-init (Ubuntu)
Importance: High
Status: Triaged
** Affects: systemd (Ubuntu)
Importance: Medium
Assignee: Martin Pitt (pitti)
Status: Fix Released
** Affects: cloud-init (Ubuntu Xenial)
Importance: Medium
Status: Confirmed
** Affects: systemd (Ubuntu Xenial)
Importance: High
Status: Fix Released
** Affects: cloud-init (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu Yakkety)
Importance: Medium
Status: Fix Released
** Affects: ubuntu-translations
Importance: Undecided
Status: New
** Tags: patch verification-needed
--
systemd-networkd runs too late for cloud-init.service (net)
https://bugs.launchpad.net/bugs/1636912
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