provide a way to seed NoCloud from network without image modification.

Bug #1691772 reported by Scott Moser on 2017-05-18
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
cloud-init
Medium
Unassigned
cloud-init (Ubuntu)
Medium
Unassigned
Xenial
Medium
Unassigned
Zesty
Medium
Unassigned

Bug Description

=== Begin SRU Template ===
[Impact]
In bug 1660385, we made imitating the EC2 datasource more difficult.
By design, that broke some users or platforms who have done so in the past.

The change here gives users who were using the Ubuntu images in a low-tech
"No Cloud" fashion an easier way to regain that functionality.

The solution was to read the 'system-serial-number' field in DMI data and
consider it as as input to the nocloud datasource in a similar way to
what we had done in the past with the kernel command line.

[Test Case]
a.) download a cloud image, update its cloud-init

   # see below for 'get-proposed-cloudimg'
   $ release=xenial
   $ get-proposed-cloudimg $release

b.) boot that image with command line pointing at a 'seed'

   $ img=${release}-server-cloudimg-amd64-proposed.img
   # url has to provide '<url>/user-data' and '<url>/meta-data'
   $ url=https://git.launchpad.net/~smoser/cloud-init/+git/sru-info/plain/bugs/lp-1691772/
   $ qemu-system-x86_64 -snapshot -enable-kvm -m 512 \
      -device virtio-net-pci,netdev=net00 -netdev type=user,id=net00 \
      -drive "file=$img,if=virtio" \
      -smbios "type=1,serial=ds=nocloud-net;seedfrom=$url" \
      -nographic

   # note, you can hit 'ctrl-a c' to toggle between the qemu monitor
   # and the serial console in '-nographic' mode.

c.) Log in with 'ubuntu:passw0rd' and check hostname.
   If the above url was correctly used, then:
     * you can log in with 'ubuntu:passw0rd'
     * the hostname will be set to 'nocloud-guest'
     * /run/cloud-init/result.json will show that the url has been used.

   ubuntu@nocloud-guest:~$ hostname
   nocloud-guest
   ubuntu@nocloud-guest$ cat /run/cloud-init/result.json
   {
    "v1": {
     "datasource": "DataSourceNoCloudNet [seed=dmi,https://git.launchpad.net/~smoser/cloud-init/+git/sru-info/plain/bugs/lp-1691772/][dsmode=net]",
     "errors": []
    }
   }

[Regression Potential]
The code attempts to parse the 'system-serial-number' entry in dmi data as a
string with data in it. If that field had the string 'ds=nocloud' that was
not intended as consumable for cloud-init, a false positive could occur and
an exception cause the NoCloud datasource to not read data from another
location.

This seems somewhat unlikely and other paths should result in simply no
new action being taken.

[Other Info]
Upstream commit at
  https://git.launchpad.net/cloud-init/commit/?id=802e7cb2da8

get-proposed-cloudimg is available at [1], it basically downloads an
ubuntu cloud image, enables -proposed and upgrade/installs cloud-init.

--
[1] https://git.launchpad.net/~smoser/cloud-init/+git/sru-info/tree/bin/get-proposed-cloudimg

=== End SRU Template ===

Vladimir suggested this in bug 1660385 comment 12 [1].
The idea would be to have a supported way that you could seed images with cloud-init using Nocloud without any tinkering in the image. That would mean
 a.) no second block device
 b.) no usage of kernel command line.

--
[1] https://bugs.launchpad.net/cloud-init/+bug/1660385/comments/12

Scott Moser (smoser) on 2017-05-18
Changed in cloud-init:
status: New → Confirmed
importance: Undecided → Medium
Scott Moser (smoser) on 2017-07-31
Changed in cloud-init (Ubuntu):
status: New → Fix Released
importance: Undecided → Medium
Changed in cloud-init (Ubuntu Xenial):
status: New → Confirmed
Changed in cloud-init (Ubuntu Zesty):
status: New → Confirmed
Changed in cloud-init (Ubuntu Xenial):
importance: Undecided → Medium
Changed in cloud-init (Ubuntu Zesty):
importance: Undecided → Medium
Scott Moser (smoser) on 2017-08-02
description: updated
Scott Moser (smoser) on 2017-08-02
description: updated
Changed in cloud-init:
status: Confirmed → Fix Released
Scott Moser (smoser) on 2017-08-04
Changed in cloud-init:
status: Fix Released → Fix Committed

Hello Scott, or anyone else affected,

Accepted cloud-init into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/cloud-init/0.7.9-233-ge586fe35-0ubuntu1~16.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-xenial to verification-done-xenial. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-xenial. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Changed in cloud-init (Ubuntu Xenial):
status: Confirmed → Fix Committed
tags: added: verification-needed verification-needed-xenial
Changed in cloud-init (Ubuntu Zesty):
status: Confirmed → Fix Committed
tags: added: verification-needed-zesty
Chris J Arges (arges) wrote :

Hello Scott, or anyone else affected,

Accepted cloud-init into zesty-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/cloud-init/0.7.9-233-ge586fe35-0ubuntu1~17.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-zesty to verification-done-zesty. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-zesty. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Chad Smith (chad.smith) wrote :

# Verified seeding nocloud from URL sets hostname properly from seed.

url=https://git.launchpad.net/~smoser/cloud-init/+git/sru-info/plain/bugs/lp-1691772/;
for release in xenial zesty; do
   get-proposed-cloudimg $release;
   img=$release-server-cloudimg-amd64-proposed.img;
   qemu-system-x86_64 -snapshot -enable-kvm -m 512 \
      -device virtio-net-pci,netdev=net00 -netdev type=user,id=net00 \
      -drive "file=$img,if=virtio" \
      -smbios "type=1,serial=ds=nocloud-net;seedfrom=$url" \
      -nographic;

   # login ubuntu:passw0rd
   hostname;
   cat /run/cloud-init/result.json;
   grep CODENAME /etc/lsb-release;
   dpkg-query --show cloud-init ;
done

-- xenial seed test

ubuntu@nocloud-guest:~$ hostname
nocloud-guest
ubuntu@nocloud-guest:~$ cat /run/cloud-init/result.json
{
 "v1": {
  "datasource": "DataSourceNoCloudNet [seed=dmi,https://git.launchpad.net/~smoser/cloud-init/+git/sru-info/plain/bugs/lp-1691772/][dsmode=net]",
  "errors": []
 }
}
ubuntu@nocloud-guest:~$ grep -i code /etc/lsb-release
DISTRIB_CODENAME=xenial
ubuntu@nocloud-guest:~$ dpkg-query --show cloud-init
cloud-init 0.7.9-233-ge586fe35-0ubuntu1~16.04.1
ubuntu@nocloud-guest:~$ sudo shutdown -h now
...

-- zesty test
 http://cloud-images.ubuntu.com/daily/server/zesty/current/zesty-server-cloudimg-amd64.img
...

ubuntu@nocloud-guest:~$ hostname
nocloud-guest
ubuntu@nocloud-guest:~$ cat /run/cloud-init/result.json
{
 "v1": {
  "datasource": "DataSourceNoCloudNet [seed=dmi,https://git.launchpad.net/~smoser/cloud-init/+git/sru-info/plain/bugs/lp-1691772/][dsmode=net]",
  "errors": []
 }
}
ubuntu@nocloud-guest:~$ grep CODENAME /etc/lsb-release
DISTRIB_CODENAME=zesty
ubuntu@nocloud-guest:~$ dpkg-query --show cloud-init
cloud-init 0.7.9-233-ge586fe35-0ubuntu1~17.04.1

tags: added: verification-done-xenial verification-done-zesty
removed: verification-needed verification-needed-xenial verification-needed-zesty
Launchpad Janitor (janitor) wrote :
Download full text (6.4 KiB)

This bug was fixed in the package cloud-init - 0.7.9-233-ge586fe35-0ubuntu1~16.04.1

---------------
cloud-init (0.7.9-233-ge586fe35-0ubuntu1~16.04.1) xenial-proposed; urgency=medium

  * debian/cloud-init.templates: enable Scaleway cloud.
  * debian/cloud-init.templates: enable Aliyun cloud.
  * drop the following cherry picks, now incorporated in snapshot.
    + debian/patches/cpick-5fb49bac-azure-identify-platform...
    + debian/patches/cpick-003c6678-net-remove-systemd-link...
    + debian/patches/cpick-1cd4323b-azure-remove-accidental...
    + debian/patches/cpick-ebc9ecbc-Azure-Add-network-config...
    + debian/patches/cpick-11121fe4-systemd-make-cloud-final...
  * debian/patches/stable-release-no-jsonschema-dep.patch:
    add patch to remove optional dependency on jsonschema.
  * New upstream snapshot.
    - cloudinit.net: add initialize_network_device function and tests
      [Chad Smith]
    - makefile: fix ci-deps-ubuntu target [Chad Smith]
    - tests: adjust locale integration test to parse default locale.
    - tests: remove 'yakkety' from releases as it is EOL.
    - centos: do not package systemd-fsck drop-in.
    - systemd: make systemd-fsck run after cloud-init.service (LP: #1691489)
    - tests: Add initial tests for EC2 and improve a docstring.
    - locale: Do not re-run locale-gen if provided locale is system default.
    - archlinux: fix set hostname usage of write_file. [Joshua Powers]
    - sysconfig: support subnet type of 'manual'.
    - tools/run-centos: make running with no argument show help.
    - Drop rand_str() usage in DNS redirection detection
      [Bob Aman] (LP: #1088611)
    - sysconfig: use MACADDR on bonds/bridges to configure mac_address
      [Ryan Harper]
    - net: eni route rendering missed ipv6 default route config
      [Ryan Harper] (LP: #1701097)
    - sysconfig: enable mtu set per subnet, including ipv6 mtu
      [Ryan Harper]
    - sysconfig: handle manual type subnets [Ryan Harper]
    - sysconfig: fix ipv6 gateway routes [Ryan Harper]
    - sysconfig: fix rendering of bond, bridge and vlan types.
      [Ryan Harper]
    - Templatize systemd unit files for cross distro deltas. [Ryan Harper]
    - sysconfig: ipv6 and default gateway fixes. [Ryan Harper]
    - net: fix renaming of nics to support mac addresses written in upper
      case. (LP: #1705147)
    - tests: fixes for issues uncovered when moving to python 3.6.
    - sysconfig: include GATEWAY value if set in subnet
      [Ryan Harper]
    - Scaleway: add datasource with user and vendor data for Scaleway.
      [Julien Castets]
    - Support comments in content read by load_shell_content.
    - cloudinitlocal fail to run during boot [Hongjiang Zhang]
    - doc: fix disk setup example table_type options [Sandor Zeestraten]
    - tools: Fix exception handling. [Joonas Kylmälä]
    - tests: fix usage of mock in GCE test.
    - test_gce: Fix invalid mock of platform_reports_gce to return False
      [Chad Smith]
    - test: fix incorrect keyid for apt repository. [Joshua Powers]
    - tests: Update version of pylxd [Joshua Powers]
    - write_files: Remove log from helper function signatures.
      [Andrew Jorgensen]
    - doc: document...

Read more...

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

The verification of the Stable Release Update for cloud-init has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

Launchpad Janitor (janitor) wrote :
Download full text (6.4 KiB)

This bug was fixed in the package cloud-init - 0.7.9-233-ge586fe35-0ubuntu1~17.04.1

---------------
cloud-init (0.7.9-233-ge586fe35-0ubuntu1~17.04.1) zesty; urgency=medium

  * debian/cloud-init.templates: enable Scaleway cloud.
  * debian/cloud-init.templates: enable Aliyun cloud.
  * drop the following cherry picks, now incorporated in snapshot.
    + debian/patches/cpick-5fb49bac-azure-identify-platform...
    + debian/patches/cpick-003c6678-net-remove-systemd-link...
    + debian/patches/cpick-1cd4323b-azure-remove-accidental...
    + debian/patches/cpick-ebc9ecbc-Azure-Add-network-config...
    + debian/patches/cpick-11121fe4-systemd-make-cloud-final...
  * debian/patches/stable-release-no-jsonschema-dep.patch:
    add patch to remove optional dependency on jsonschema.
  * New upstream snapshot.
    - cloudinit.net: add initialize_network_device function and tests
      [Chad Smith]
    - makefile: fix ci-deps-ubuntu target [Chad Smith]
    - tests: adjust locale integration test to parse default locale.
    - tests: remove 'yakkety' from releases as it is EOL.
    - centos: do not package systemd-fsck drop-in.
    - systemd: make systemd-fsck run after cloud-init.service (LP: #1691489)
    - tests: Add initial tests for EC2 and improve a docstring.
    - locale: Do not re-run locale-gen if provided locale is system default.
    - archlinux: fix set hostname usage of write_file. [Joshua Powers]
    - sysconfig: support subnet type of 'manual'.
    - tools/run-centos: make running with no argument show help.
    - Drop rand_str() usage in DNS redirection detection
      [Bob Aman] (LP: #1088611)
    - sysconfig: use MACADDR on bonds/bridges to configure mac_address
      [Ryan Harper]
    - net: eni route rendering missed ipv6 default route config
      [Ryan Harper] (LP: #1701097)
    - sysconfig: enable mtu set per subnet, including ipv6 mtu
      [Ryan Harper]
    - sysconfig: handle manual type subnets [Ryan Harper]
    - sysconfig: fix ipv6 gateway routes [Ryan Harper]
    - sysconfig: fix rendering of bond, bridge and vlan types.
      [Ryan Harper]
    - Templatize systemd unit files for cross distro deltas. [Ryan Harper]
    - sysconfig: ipv6 and default gateway fixes. [Ryan Harper]
    - net: fix renaming of nics to support mac addresses written in upper
      case. (LP: #1705147)
    - tests: fixes for issues uncovered when moving to python 3.6.
    - sysconfig: include GATEWAY value if set in subnet
      [Ryan Harper]
    - Scaleway: add datasource with user and vendor data for Scaleway.
      [Julien Castets]
    - Support comments in content read by load_shell_content.
    - cloudinitlocal fail to run during boot [Hongjiang Zhang]
    - doc: fix disk setup example table_type options [Sandor Zeestraten]
    - tools: Fix exception handling. [Joonas Kylmälä]
    - tests: fix usage of mock in GCE test.
    - test_gce: Fix invalid mock of platform_reports_gce to return False
      [Chad Smith]
    - test: fix incorrect keyid for apt repository. [Joshua Powers]
    - tests: Update version of pylxd [Joshua Powers]
    - write_files: Remove log from helper function signatures.
      [Andrew Jorgensen]
    - doc: document the cmdli...

Read more...

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

This bug is believed to be fixed in cloud-init in 17.1. If this is still a problem for you, please make a comment and set the state back to New

Thank you.

Changed in cloud-init:
status: Fix Committed → Fix Released
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