glean: Ordering cycle found, skipping Network (Pre)

[Waldemar Znoinski]

ubuntu 16, image built using dib (by nodepool) using standard + custom elements:
      - ubuntu
      - vm
      - openstack-repos
      - puppet
      - nodepool-base
      - node-devstack
      - growroot
      - apt-conf
      - local-config
      - cache-bindep
      - simple-init

...

when having glean (via simple-init dib element) enabled in the image, I see the below at systemd startup causing no interfaces to be brought up (all are as DOWN):

[ 79.954114] cloud-init[773]: Cloud-init v. 0.7.8 running 'init-local' at Tue, 29 Nov 2016 15:39:12 +0000. Up 79.43 seconds.
         Starting udev Kernel Device Manager...
[ OK ] Started Journal Service.
[ OK ] Started udev Kernel Device Manager.
[ OK ] Started udev Wait for Complete Device Initialization.
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ OK ] Found device /dev/ttyS0.
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ SKIP ] Ordering cycle found, skipping Raise network interfaces
[ SKIP ] Ordering cycle found, skipping Network (Pre)
[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[ OK ] Reached target Local File Systems (Pre).
[ OK ] Reached target Local File Systems.

removing
Before=network-pre.target

from
/usr/lib/systemd/system/glean@.service

seems to fix the problem at boot

[Paul Belanger (pabelanger)]

We need to be careful here, as changing this order in the past has caused problems. I suspect there is a problem with the ubuntu element.

If you switch to ubuntu-minimal, is this an issue?

[Waldemar Znoinski (wznoinsk)]

 cat /usr/lib/systemd/system/glean@.service
[Unit]
Description=Glean for interface %I
Before=network-pre.target
Wants=network-pre.target

ConditionPathExists=!/etc/sysconfig/network-scripts/ifcfg-%I

[Service]
Type=oneshot
User=root
ExecStartPre=/usr/local/bin/glean.sh %I
ExecStart=/sbin/ifup %I
RemainAfterExit=true

[Install]
WantedBy=multi-user.target