Ubuntu
cloud-init package

need to support renaming of devices in container and on first boot

Xenial (16.04)
Bug #1579130

Bug #1579130 reported by Scott Moser on 2016-05-06

This bug affects 1 person

	Status	Importance	Assigned to
cloud-init (Ubuntu)	Fix Released	High	Scott Moser
Xenial	Fix Released	High	Scott Moser
systemd (Ubuntu)	Invalid	Wishlist	Unassigned

Bug Description

We're interested in supporting network configuration of cloud instances including lxc containers via maas/cloud-init yaml format.

For Containers, the end goal is to do:
$ lxc init xenial x1
$ ncpath=/var/lib/cloud/seed/nocloud-net/network-config
$ sudo tee /var/lib/lxd/containers/x1/rootfs/$ncpath <<EOF
version: 1
config:
  - type: physical
    mac_address: "00:16:3e:3b:01:7a"
    name: foo2
    subnets:
      - type: dhcp
        control: auto
EOF

$ lxc start x1
$ lxc exec x1 /bin/bash

From inside we expect to have a device named 'foo2' at this point that has dhcp'd.

Currently cloud-init is writing files named:
/etc/systemd/network/50-cloud-init-eth0.link
and expecting systemd.link(5) to rename them.

We've run into a number of issues with this.
a.) we don't get coldplug events for devices in a container, so writing systemd.link (or 70-persistent-net.rules style udev rules files) wont "just work" to apply the name changes.

b.) systemd.link does not rename devices that have been renamed previously, and all lxd instance devices are renamed (from the kernel returned veth<random> into 'eth0').
That is implemented by check of /sys/devices/virtual/net/eth0/name_assign_type . Value of 4 means renamed.

c.) systemd.link will not attempt to rename a device that does not have a driver.
To see that run: udevadm test-builtin net_setup_link /sys/class/net/eth0
http://paste.ubuntu.com/16261974/

d.) on first boot of a cloud instance, the systemd.link files in the initramfs are either pristine or from the previous instance. The devices will leave the initramfs either named incorrectly or named with standard persistent naming and will have already been renamed.

To force these systemd.link files to run in spite of 'b' on kvm guests or bare metal, we have found that unbind and rebind of the device will clear the state and rename would occur. that can be done as shown in https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1577844/comments/3 but since there is no 'driver' we cannot unbind and rebind veth devices.

To do this right, we need to support:
1.) renaming on first boot with initramfs and with 'stale' initramfs
2.) renaming in lxc containers
3.) user updating whatever files or mechanism is used post first boot. For example, if the user wrote a 25-my-rules.link after first boot, a reboot should prefer their provided names to whatever were originally there.
4.) if cloud-init networking is disabled, the renaming should not occur.

Related Bugs:
* bug 1594546: no need to write systemd.link files

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: udev 229-4ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Fri May 6 15:42:52 2016
MachineType: LENOVO 33672B7
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=19ac97d5-6973-4193-9a09-2e6bbfa38262 ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/18/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G8ET96WW (2.56 )
dmi.board.asset.tag: Not Available
dmi.board.name: 33672B7
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG8ET96WW(2.56):bd12/18/2013:svnLENOVO:pn33672B7:pvrThinkPadX131e:rvnLENOVO:rn33672B7:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 33672B7
dmi.product.version: ThinkPad X131e
dmi.sys.vendor: LENOVO

See original description

Tags:

Related branches

lp://staging/~cloud-init-dev/cloud-init/trunk

Merged into lp://staging/~hannes-georg-0/cloud-init/add_mkswap_force_flag

Chad Smith (community): Needs Fixing on 2017-06-06

Hannes: Pending requested 2016-05-30

Diff: 51583 lines (+11/-49380) (has conflicts)

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tests/unittests/test_distros/test_sysconfig.py (+0/-82)
tests/unittests/test_distros/test_user_data_normalize.py (+0/-297)
tests/unittests/test_ec2_util.py (+0/-139)
tests/unittests/test_filters/test_launch_index.py (+0/-132)
tests/unittests/test_handler/test_handler_apt_configure.py (+0/-109)
tests/unittests/test_handler/test_handler_ca_certs.py (+0/-271)
tests/unittests/test_handler/test_handler_chef.py (+0/-192)
tests/unittests/test_handler/test_handler_debug.py (+0/-81)
tests/unittests/test_handler/test_handler_disk_setup.py (+0/-30)
tests/unittests/test_handler/test_handler_growpart.py (+0/-220)
tests/unittests/test_handler/test_handler_locale.py (+0/-67)
tests/unittests/test_handler/test_handler_lxd.py (+0/-134)
tests/unittests/test_handler/test_handler_mounts.py (+0/-133)
tests/unittests/test_handler/test_handler_power_state.py (+0/-127)
tests/unittests/test_handler/test_handler_rsyslog.py (+0/-174)
tests/unittests/test_handler/test_handler_seed_random.py (+0/-227)
tests/unittests/test_handler/test_handler_set_hostname.py (+0/-72)
tests/unittests/test_handler/test_handler_snappy.py (+0/-306)
tests/unittests/test_handler/test_handler_timezone.py (+0/-76)
tests/unittests/test_handler/test_handler_write_files.py (+0/-112)
tests/unittests/test_handler/test_handler_yum_add_repo.py (+0/-68)
tests/unittests/test_helpers.py (+0/-33)
tests/unittests/test_merging.py (+0/-257)
tests/unittests/test_net.py (+0/-130)
tests/unittests/test_pathprefix2dict.py (+0/-44)
tests/unittests/test_registry.py (+0/-28)
tests/unittests/test_reporting.py (+0/-369)
tests/unittests/test_rh_subscription.py (+0/-214)
tests/unittests/test_runs/test_merge_run.py (+0/-54)
tests/unittests/test_runs/test_simple_run.py (+0/-81)
tests/unittests/test_sshutil.py (+0/-171)
tests/unittests/test_templating.py (+0/-119)
tests/unittests/test_util.py (+0/-489)
tests/unittests/test_vmware_config_file.py (+0/-103)
tools/21-cloudinit.conf (+0/-6)
tools/Z99-cloud-locale-test.sh (+0/-98)
tools/build-on-freebsd (+0/-66)
tools/ccfg-merge-debug (+0/-90)
tools/cloud-init-per (+0/-60)
tools/hacking.py (+0/-170)
tools/make-dist-tarball (+0/-21)
tools/make-mime.py (+0/-60)
tools/make-tarball (+0/-39)
tools/mock-meta.py (+0/-454)
tools/motd-hook (+0/-35)
tools/read-dependencies (+0/-29)
tools/read-version (+0/-26)
tools/run-pep8 (+0/-22)
tools/run-pyflakes (+0/-18)
tools/run-pyflakes3 (+0/-2)
tools/tox-venv (+0/-42)
tools/uncloud-init (+0/-141)
tools/validate-yaml.py (+0/-25)
tools/write-ssh-key-fingerprints (+0/-38)
tox.ini (+0/-35)
udev/66-azure-ephemeral.rules (+0/-18)
udev/79-cloud-init-net-wait.rules (+0/-10)
udev/cloud-init-wait (+0/-70)
upstart/cloud-config.conf (+0/-9)
upstart/cloud-final.conf (+0/-10)
upstart/cloud-init-blocknet.conf (+0/-83)
upstart/cloud-init-container.conf (+0/-57)
upstart/cloud-init-local.conf (+0/-16)
upstart/cloud-init-nonet.conf (+0/-66)
upstart/cloud-init.conf (+0/-9)
upstart/cloud-log-shutdown.conf (+0/-19)

Superseded for merging into lp://staging/~d-jj/cloud-init/chef-12-updates

JJ Asghar: Pending requested 2015-03-03

Merged into lp://staging/~jbauer/cloud-init/salt at revision 561

Scott Moser: Pending requested 2012-05-08

lp://staging/~smoser/ubuntu/yakkety/cloud-init/pkg

lp://staging/~smoser/ubuntu/xenial/cloud-init/pkg

Revision history for this message

Scott Moser (smoser) wrote on 2016-05-06:

NonfreeKernelModules.txt Edit (1.2 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (225.8 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (2.0 KiB, text/plain; charset="utf-8")
JournalErrors.txt Edit (8.4 KiB, text/plain; charset="utf-8")
Lspci.txt Edit (11.3 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (443 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (1.8 KiB, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.8 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (6.4 KiB, text/plain; charset="utf-8")
UdevDb.txt Edit (104.8 KiB, text/plain; charset="utf-8")

Scott Moser (smoser) on 2016-05-06

description:	updated
Changed in cloud-init (Ubuntu):
status:	New → Confirmed
importance:	Undecided → High
description:	updated
description:	updated

Martin Pitt (pitti) on 2016-05-07

Changed in systemd (Ubuntu):
status:	New → Triaged
assignee:	nobody → Martin Pitt (pitti)

Scott Moser (smoser) on 2016-05-27

description:

updated

Scott Moser (smoser) on 2016-05-27

summary:

- need to support systemd.link renaming of devices in container
+ need to support renaming of devices in container and on first boot

Scott Moser (smoser) on 2016-05-27

description:

updated

Revision history for this message

Alberto Salvia Novella (es20490446e) wrote on 2016-06-01:

@ Martin Pitt

Please check if bug importance is correct.

Changed in systemd (Ubuntu):
importance:	Undecided → High
importance:	High → Wishlist

Revision history for this message

Scott Moser (smoser) wrote on 2016-06-03:

I have fixes for this in cloud-init in my branch at https://launchpad.net/~smoser/+archive/ubuntu/cloud-init-dev/+packages
that is available in the ppa at https://launchpad.net/~smoser/+archive/ubuntu/cloud-init-dev/+packages

Revision history for this message

Launchpad Janitor (janitor) wrote on 2016-06-05:

This bug was fixed in the package cloud-init - 0.7.7~bzr1227-0ubuntu1

---------------
cloud-init (0.7.7~bzr1227-0ubuntu1) yakkety; urgency=medium

* New upstream snapshot.
- fix one more unit test to run inside buildd.

-- Scott Moser <email address hidden> Sat, 04 Jun 2016 20:55:07 -0400

Changed in cloud-init (Ubuntu):
status:	Confirmed → Fix Released

Scott Moser (smoser) on 2016-06-20

description:

updated

Revision history for this message

Scott Moser (smoser) wrote on 2016-06-23:

Hello,
An SRU upload of cloud-init for 16.04 that contains a fix for this bug has been made under bug 1595302. Please track that bug if you are interested.

Changed in cloud-init (Ubuntu Xenial):
importance:	Undecided → High
status:	New → In Progress
no longer affects:	systemd (Ubuntu Xenial)
Changed in cloud-init (Ubuntu):
assignee:	nobody → Scott Moser (smoser)
Changed in cloud-init (Ubuntu Xenial):
assignee:	nobody → Scott Moser (smoser)

Revision history for this message

Scott Moser (smoser) wrote on 2016-07-11:

fix is now released to xenial under bug 1595302. daily cloud-images with this newer version of cloud-init should appear in the next few days. Any image with a serial number *newer* than 20160707 should have cloud-init at 0.7.7~bzr1246-0ubuntu1~16.04.1 .

Changed in cloud-init (Ubuntu Xenial):
status:	In Progress → Fix Released

Martin Pitt (pitti) on 2016-11-28

Changed in systemd (Ubuntu):
assignee:	Martin Pitt (pitti) → nobody

Revision history for this message

Dan Streetman (ddstreet) wrote on 2021-06-30:

please reopen if this is still an issue

Changed in systemd (Ubuntu):
status:	Triaged → Invalid

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Ubuntucloud-init package

need to support renaming of devices in container and on first boot

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