For the record: the "hang" was the ~ 10s timeout for IPv6 RA. I was
testing with Yakkety/Zesty's QEMU whose "user" net has a builtin RA (you
get an fec0::* address), while xenial's doesn't.
We enable RA (on the client side) by default, and IMHO should really do
so -- selling a new solution in 2016 which does not speak IPv6 would be
hilarious. You can't also significantly reduce the timeout, as this
would make RA unreliable and it's presumably also a specification
somewhere.
So AFAICS the remaining issue is just to make networkd run before
dbus.service/socket in systemd, and add "After=networking.service
systemd-networkd-wait-online.service" and drop
"Wants=networking.service" in cloud-init.service.
** Changed in: systemd (Ubuntu)
Milestone: None => ubuntu-16.11
** Changed in: systemd (Ubuntu)
Status: Triaged => In Progress
** Changed in: systemd (Ubuntu Xenial)
Status: Triaged => In Progress
** Changed in: systemd (Ubuntu Xenial)
Assignee: (unassigned) => Martin Pitt (pitti)
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https://bugs.launchpad.net/bugs/1636912
Title:
systemd-networkd runs too late for cloud-init.service (net)
Status in systemd:
New
Status in cloud-init package in Ubuntu:
Triaged
Status in systemd package in Ubuntu:
In Progress
Status in cloud-init source package in Xenial:
New
Status in systemd source package in Xenial:
In Progress
Bug description:
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
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