FQDN / hostname recorded in OVSDB is unreliable

[Frode Nordahl]

[ Impact ]

The Open vSwitch init script `ovs-ctl` determines the system hostname and records it in the `external-ids:hostname` field of the `Open-vSwitch` table in the local OVSDB.

This value may be consumed by downstream software and having it unset or set to a incorrect value could lead to erratic behavior of a system.

In recent Ubuntu development we have also made it possible to configure Open vSwitch with netplan.io, which allows for a Open vSwitch controlled data path to be the only external network connection on a system.

As such the current startup sequence of Open vSwitch is insufficient to allow for reliable recording of FQDN / hostname at system boot-up time.

Examples of downstream issues can be viewed in bug 1896630 and bug 1912844 comment #26.

[ Test Case ]

1) Deploy bundle on metal:

series: focal
machines:
  '0':
    constraints: cores=48
relations:
 - - octavia:ovsdb-subordinate
   - ovn-chassis:ovsdb-subordinate
applications:
  ovn-chassis:
    charm: cs:ovn-chassis
    bindings:
      "": public-space
  octavia:
    charm: cs:octavia
    options:
      openstack-origin: distro
    num_units: 1
    to:
    - 'lxd:0'
    bindings:
      "": public-space

2) juju run --unit ovn-chassis/0 'ovs-vsctl remove open-vswitch . external-ids hostname'
3) juju run --unit ovn-chassis/0 'sudo shutdown -r now'
4) Observe external-ids:hostname being recorded as a shortname
5) Add proposed and install openvswitch packages, repeat step 2-3
6) Observe external-ids:hostname being recorded as a FQDN

[ Regression potential ]

Minimal, the update uses the exact same methods to accomplish the end result of recording the hostname as before, we have only re-ordered when the events occur to ensure successful operation.

[racb] A new service is added in packaging. Users who have overridden existing services to change behaviour (eg. "disable all OVS-related services") may have that configuration not have the same effect after this update (eg. "I thought I disabled all OVS-related services but what's this ovs-record-hostname thing now?")

[ Other Info ]

A possible solution to this would be to extend the upstream `ovs-ctl` script to allow controlling when the hostname is recorded and adding a new Systemd service file to the package that calls the `record-hostname` function at a more appropriate time, i.e. after or as part of the `network-online.target`.

An example of downstream issues can be viewed in bug 1896630.

[Frode Nordahl (fnordahl)]

http://patchwork<email address hidden>/

[Launchpad Janitor (janitor)]

This bug was fixed in the package openvswitch - 2.15.0-0ubuntu2

---------------
openvswitch (2.15.0-0ubuntu2) hirsute; urgency=medium

  * Fix recording of FQDN/hostname on startup (LP: #1915829):
    - d/p/ovs-dev-ovs-ctl-Allow-recording-hostname-separately.patch: Cherry
      pick of committed upstream fix to support skip of hostname
      configuration on ovs-vswitchd/ovsdb-server startup.
    - d/openvswitch-switch.ovs-record-hostname.service: Record hostname in
      Open vSwitch after network-online.target using new systemd unit.
    - d/openvswitch-switch.ovs-vswitchd.service: Pass `--no-record-hostname`
      option to `ovs-ctl` to delegate recording of hostname to the separate
      service.
    - d/openvswitch-switch.ovsdb-server.service: Pass `--no-record-hostname`
      option to `ovs-ctl` to delegate recording of hostname to the separate
      service.
    - d/openvswitch-switch.service: Add `Also` reference to
      ovs-record-hostname.service so that the service is enabled on install.
    - d/rules: Add `ovs-record-hostname.service` to package build.

 -- Frode Nordahl <email address hidden> Tue, 16 Feb 2021 18:42:00 +0100

[Corey Bryant (corey.bryant)]

This bug was fixed in the package openvswitch - 2.15.0-0ubuntu2~cloud0
---------------

 openvswitch (2.15.0-0ubuntu2~cloud0) focal-wallaby; urgency=medium
 .
   * New update for the Ubuntu Cloud Archive.
 .
 openvswitch (2.15.0-0ubuntu2) hirsute; urgency=medium
 .
   * Fix recording of FQDN/hostname on startup (LP: #1915829):
     - d/p/ovs-dev-ovs-ctl-Allow-recording-hostname-separately.patch: Cherry
       pick of committed upstream fix to support skip of hostname
       configuration on ovs-vswitchd/ovsdb-server startup.
     - d/openvswitch-switch.ovs-record-hostname.service: Record hostname in
       Open vSwitch after network-online.target using new systemd unit.
     - d/openvswitch-switch.ovs-vswitchd.service: Pass `--no-record-hostname`
       option to `ovs-ctl` to delegate recording of hostname to the separate
       service.
     - d/openvswitch-switch.ovsdb-server.service: Pass `--no-record-hostname`
       option to `ovs-ctl` to delegate recording of hostname to the separate
       service.
     - d/openvswitch-switch.service: Add `Also` reference to
       ovs-record-hostname.service so that the service is enabled on install.
     - d/rules: Add `ovs-record-hostname.service` to package build.
 .
 openvswitch (2.15.0-0ubuntu1) hirsute; urgency=medium
 .
   * New upstream release 2.15
 .
 openvswitch (2.15.0~git20210104.def6eb1ea-0ubuntu3) hirsute; urgency=medium
 .
   * d/openvswitch-switch.ovsdb-server.service: avoid removing the state
     dir on restart (LP: #1910209)
 .
 openvswitch (2.15.0~git20210104.def6eb1ea-0ubuntu2) hirsute; urgency=medium
 .
   * d/rules: Re-align expected test failure with test numbering on
     armhf.
 .
 openvswitch (2.15.0~git20210104.def6eb1ea-0ubuntu1) hirsute; urgency=medium
 .
   * New upstream snapshot in preparation for 2.15.0 release.
   * d/p/*: Refresh
   * d/control: Bump minimum libdpdk-dev version to 20.11.
   * d/control: Add BD on libdbus-1-dev for pcap architectures.
   * d/rules: Set DPDK build to use shared libraries.
 .
 openvswitch (2.14.0-0ubuntu2) hirsute; urgency=medium
 .
   * d/openvswitch-switch.ovs*.service: Update ovs-vswitchd and ovsdb-server
     systemd unit files to use the correct environment file and environment
     variable for ovs-ctl options, /etc/default/openvswitch-switch and
     OVS_CTL_OPTS, respectively (LP: #1906280).
 .
 openvswitch (2.14.0-0ubuntu1) hirsute; urgency=medium
 .
   * New upstream release.
   * d/p/*: Refresh.
 .
 openvswitch (2.13.1-0ubuntu1) groovy; urgency=medium
 .
   [ Chris MacNaughton ]
   * d/openvswitch-switch.ovsdb-server.service: Add local-fs.target to
     systemd service file to ensure that local filesystems are ready
     before the ovsdb service tries to start (LP: #1887177).
   * d/control: Remove Breaks/Replaces that are older than Focal (LP: #1878419).
 .
   [ James Page ]
   * New upstream point release.
   * d/p/py3-compat.patch: Refresh.

[Dmitrii Shcherbakov (dmitriis)]

Marked as Fix-Committed for Focal and Groovy based on:

https://code.launchpad.net/~fnordahl/ubuntu/+source/openvswitch/+git/openvswitch/+merge/399763
https://code.launchpad.net/~fnordahl/ubuntu/+source/openvswitch/+git/openvswitch/+merge/399764

https://launchpad.net/ubuntu/focal/+queue?queue_state=1&queue_text=openvswitch
https://launchpad.net/ubuntu/groovy/+queue?queue_state=1&queue_text=openvswitch

[Robie Basak (racb)]

Hello Frode, or anyone else affected,

Accepted openvswitch into groovy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/openvswitch/2.13.3-0ubuntu0.20.10.1 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, what testing has been performed on the package and change the tag from verification-needed-groovy to verification-done-groovy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-groovy. In either case, without details of your testing we will not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Robie Basak (racb)]

Hello Frode, or anyone else affected,

Accepted openvswitch into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/openvswitch/2.13.3-0ubuntu0.20.04.1 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, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted openvswitch (2.13.3-0ubuntu0.20.10.1) for groovy have finished running.
The following regressions have been reported in tests triggered by the package:

netplan.io/0.101-0ubuntu3~20.10.1 (amd64, ppc64el)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/groovy/update_excuses.html#openvswitch

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[Ubuntu SRU Bot (ubuntu-sru-bot)]

All autopkgtests for the newly accepted openvswitch (2.13.3-0ubuntu0.20.04.1) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

netplan.io/0.101-0ubuntu3~20.04.2 (amd64)

Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-migration/focal/update_excuses.html#openvswitch

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

[James Page (james-page)]

Hello Frode, or anyone else affected,

Accepted openvswitch into ussuri-proposed. The package will build now and be available in the Ubuntu Cloud Archive in a few hours, and then in the -proposed repository.

Please help us by testing this new package. To enable the -proposed repository:

  sudo add-apt-repository cloud-archive:ussuri-proposed
  sudo apt-get update

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-ussuri-needed to verification-ussuri-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-ussuri-failed. 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!

[James Page (james-page)]

I checked on the autopkgtest failures reported for focal and groovy - the failing test is related to general netplan.io linux bond testing and is unrelated to the OVS support in netplan.io.

[Frode Nordahl (fnordahl)]

$ juju run --unit ovn-chassis/0 'ovs-vsctl remove open-vswitch . external-ids hostname'
$ juju run --unit ovn-chassis/0 'sudo shutdown -r now'
$ sudo ovs-vsctl list open-vswitch
...
external_ids : {hostname=juju-d4e71d-0-lxd-0, rundir="/var/run/openvswitch", system-id="424e6f88-2e79-436f-99a8-d9e4dccf3c55"}
$ hostname -f
juju-d4e71d-0-lxd-0.maas
# sudo apt install openvswitch-common openvswitch-switch python3-openvswitch
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  openvswitch-doc
The following packages will be upgraded:
  openvswitch-common openvswitch-switch python3-openvswitch
3 upgraded, 0 newly installed, 0 to remove and 21 not upgraded.
Need to get 2783 kB of archives.
After this operation, 28.7 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 python3-openvswitch all 2.13.3-0ubuntu0.20.04.1 [94.8 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 openvswitch-common amd64 2.13.3-0ubuntu0.20.04.1 [1152 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 openvswitch-switch amd64 2.13.3-0ubuntu0.20.04.1 [1536 kB]
Fetched 2783 kB in 1s (1986 kB/s)
(Reading database ... 53438 files and directories currently installed.)
Preparing to unpack .../python3-openvswitch_2.13.3-0ubuntu0.20.04.1_all.deb ...
Unpacking python3-openvswitch (2.13.3-0ubuntu0.20.04.1) over (2.13.1-0ubuntu0.20
.04.4) ...
Preparing to unpack .../openvswitch-common_2.13.3-0ubuntu0.20.04.1_amd64.deb ...
Unpacking openvswitch-common (2.13.3-0ubuntu0.20.04.1) over (2.13.1-0ubuntu0.20.
04.4) ...
Preparing to unpack .../openvswitch-switch_2.13.3-0ubuntu0.20.04.1_amd64.deb ...
Unpacking openvswitch-switch (2.13.3-0ubuntu0.20.04.1) over (2.13.1-0ubuntu0.20.
04.4) ...
Setting up python3-openvswitch (2.13.3-0ubuntu0.20.04.1) ...
Setting up openvswitch-common (2.13.3-0ubuntu0.20.04.1) ...
Setting up openvswitch-switch (2.13.3-0ubuntu0.20.04.1) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for systemd (245.4-4ubuntu3.6) ...
$ juju run --unit ovn-chassis/0 'ovs-vsctl remove open-vswitch . external-ids hostname'
$ juju run --unit ovn-chassis/0 'sudo shutdown -r now'
$ sudo ovs-vsctl list open-vswitch
...
external_ids : {hostname=juju-d4e71d-0-lxd-0.maas, rundir="/var/run/openvswitch", system-id="424e6f88-2e79-436f-99a8-d9e4dccf3c55"}

[Łukasz Zemczak (sil2100)]

Hello! Could we get this verified for groovy? Thanks!

[James Page (james-page)]

$ sudo ovs-vsctl remove open-vswitch . external-ids hostname

$ sudo ovs-vsctl remove open-vswitch . external-ids hostname

$ sudo ovs-vsctl list open-vswitch
_uuid : c81d24ea-3ca1-4064-8e67-b91ac6ca801b
bridges : [1c3c998d-7158-46b0-bea3-04f94d474ed0, 6d4fa31d-07a6-4ca7-b9b9-7ca0adefd8d3]
cur_cfg : 21
datapath_types : [netdev, system]
datapaths : {}
db_version : "8.2.0"
dpdk_initialized : false
dpdk_version : none
external_ids : {hostname=juju-9060b4-zaza-f9005861d6e6-23.project.serverstack, ovn-bridge-mappings="physnet1:br-ex", ovn-cms-options=enable-chassis-as-gw, ovn-encap-ip="10.5.0.32", ovn-encap-type=geneve, ovn-remote="ssl:10.5.0.35:6642,ssl:10.5.0.38:6642,ssl:10.5.0.9:6642", rundir="/var/run/openvswitch", system-id=juju-9060b4-zaza-f9005861d6e6-23.project.serverstack}
iface_types : [erspan, geneve, gre, internal, ip6erspan, ip6gre, lisp, patch, stt, system, tap, vxlan]
manager_options : [a1ec106e-50fb-4238-bc74-880353c222ff]
next_cfg : 21
other_config : {}
ovs_version : "2.13.3"
ssl : 7126380d-a763-4a03-81df-d16dfc35f513
statistics : {}
system_type : ubuntu
system_version : "20.10"

$ apt-cache policy openvswitch-switch
openvswitch-switch:
  Installed: 2.13.3-0ubuntu0.20.10.1
  Candidate: 2.13.3-0ubuntu0.20.10.1
  Version table:
 *** 2.13.3-0ubuntu0.20.10.1 500
        500 http://archive.ubuntu.com/ubuntu groovy-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     2.13.1-0ubuntu1.3 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu groovy-security/main amd64 Packages
     2.13.1-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu groovy/main amd64 Packages

[Launchpad Janitor (janitor)]

This bug was fixed in the package openvswitch - 2.13.3-0ubuntu0.20.10.1

---------------
openvswitch (2.13.3-0ubuntu0.20.10.1) groovy; urgency=medium

  [ James Page ]
  * New upstream point release (LP: #1920141, LP: #1907686):
    - d/p/*: Refresh including drop of part of patch as equivalent
      changes included in point release.
    - Dropped security patches, included in release:
      + CVE-2015-8011.patch
      + CVE-2020-27827.patch
      + CVE-2020-35498.patch
  * Add BD on libdbus-1-dev to resolve linking issues for DPDK builds due
    to changes in DPDK.
  * d/control: Set minimum version of libdpdk-dev to avoid build
    failures with 19.11.6-0ubuntu0.20.10.1.

  [ Frode Nordahl ]
  * Fix recording of FQDN/hostname on startup (LP: #1915829):
    - d/p/ovs-dev-ovs-ctl-Allow-recording-hostname-separately.patch: Cherry
      pick of committed upstream fix to support skip of hostname
      configuration on ovs-vswitchd/ovsdb-server startup.
    - d/openvswitch-switch.ovs-record-hostname.service: Record hostname in
      Open vSwitch after network-online.target using new systemd unit.
    - d/openvswitch-switch.ovs-vswitchd.service: Pass `--no-record-hostname`
      option to `ovs-ctl` to delegate recording of hostname to the separate
      service.
    - d/openvswitch-switch.ovsdb-server.service: Pass `--no-record-hostname`
      option to `ovs-ctl` to delegate recording of hostname to the separate
      service.
    - d/openvswitch-switch.service: Add `Also` reference to
      ovs-record-hostname.service so that the service is enabled on install.
    - d/rules: Add `ovs-record-hostname.service` to package build.

 -- James Page <email address hidden> Wed, 24 Mar 2021 08:46:06 +0000

[Brian Murray (brian-murray)]

The verification of the Stable Release Update for openvswitch has completed successfully and the package is now being 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)]

This bug was fixed in the package openvswitch - 2.13.3-0ubuntu0.20.04.1

---------------
openvswitch (2.13.3-0ubuntu0.20.04.1) focal; urgency=medium

  [ James Page ]
  * New upstream point release (LP: #1920141, LP: #1907686).
  * Dropped security patches, included in release:
    - CVE-2015-8011.patch
    - CVE-2020-27827.patch
    - CVE-2020-35498.patch
  * Add BD on libdbus-1-dev to resolve linking issues for DPDK builds due
    to changes in DPDK.
  * d/control: Set minimum version of libdpdk-dev to avoid build
    failures with 19.11.6-0ubuntu0.20.04.1.

  [ Frode Nordahl ]
  * Fix recording of FQDN/hostname on startup (LP: #1915829):
    - d/p/ovs-dev-ovs-ctl-Allow-recording-hostname-separately.patch: Cherry
      pick of committed upstream fix to support skip of hostname
      configuration on ovs-vswitchd/ovsdb-server startup.
    - d/openvswitch-switch.ovs-record-hostname.service: Record hostname in
      Open vSwitch after network-online.target using new systemd unit.
    - d/openvswitch-switch.ovs-vswitchd.service: Pass `--no-record-hostname`
      option to `ovs-ctl` to delegate recording of hostname to the separate
      service.
    - d/openvswitch-switch.ovsdb-server.service: Pass `--no-record-hostname`
      option to `ovs-ctl` to delegate recording of hostname to the separate
      service.
    - d/openvswitch-switch.service: Add `Also` reference to
      ovs-record-hostname.service so that the service is enabled on install.
    - d/rules: Add `ovs-record-hostname.service` to package build.

 -- James Page <email address hidden> Wed, 24 Mar 2021 08:46:41 +0000

[Frode Nordahl (fnordahl)]

$ juju run --unit ovn-chassis/0 'ovs-vsctl remove open-vswitch . external-ids hostname'
$ juju run --unit ovn-chassis/0 'sudo shutdown -r now'
$ juju run --unit ovn-chassis/0 'ovs-vsctl remove open-vswitch . external-ids hostname'
$ juju run --unit ovn-chassis/0 'sudo shutdown -r now'
$ juju run --unit ovn-chassis/0 'ovs-vsctl get open-vswitch . external-ids:hostname'
juju-a0db23-0-lxd-0.maas
$ juju run --unit ovn-chassis/0 'apt-cache policy openvswitch-switch'
openvswitch-switch:
  Installed: 2.13.3-0ubuntu0.20.04.1~cloud0
  Candidate: 2.13.3-0ubuntu0.20.04.1~cloud0
  Version table:
 *** 2.13.3-0ubuntu0.20.04.1~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-proposed/ussuri/main amd64 Packages
        100 /var/lib/dpkg/status
     2.9.8-0ubuntu0.18.04.2 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
     2.9.0-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

[Chris MacNaughton (chris.macnaughton)]

The verification of the Stable Release Update for openvswitch has completed successfully and the package has now been released to -updates. 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.

[Chris MacNaughton (chris.macnaughton)]

This bug was fixed in the package openvswitch - 2.13.3-0ubuntu0.20.04.1~cloud0
---------------

 openvswitch (2.13.3-0ubuntu0.20.04.1~cloud0) bionic-ussuri; urgency=medium
 .
   * New update for the Ubuntu Cloud Archive.
 .
 openvswitch (2.13.3-0ubuntu0.20.04.1) focal; urgency=medium
 .
   [ James Page ]
   * New upstream point release (LP: #1920141, LP: #1907686).
   * Dropped security patches, included in release:
     - CVE-2015-8011.patch
     - CVE-2020-27827.patch
     - CVE-2020-35498.patch
   * Add BD on libdbus-1-dev to resolve linking issues for DPDK builds due
     to changes in DPDK.
   * d/control: Set minimum version of libdpdk-dev to avoid build
     failures with 19.11.6-0ubuntu0.20.04.1.
 .
   [ Frode Nordahl ]
   * Fix recording of FQDN/hostname on startup (LP: #1915829):
     - d/p/ovs-dev-ovs-ctl-Allow-recording-hostname-separately.patch: Cherry
       pick of committed upstream fix to support skip of hostname
       configuration on ovs-vswitchd/ovsdb-server startup.
     - d/openvswitch-switch.ovs-record-hostname.service: Record hostname in
       Open vSwitch after network-online.target using new systemd unit.
     - d/openvswitch-switch.ovs-vswitchd.service: Pass `--no-record-hostname`
       option to `ovs-ctl` to delegate recording of hostname to the separate
       service.
     - d/openvswitch-switch.ovsdb-server.service: Pass `--no-record-hostname`
       option to `ovs-ctl` to delegate recording of hostname to the separate
       service.
     - d/openvswitch-switch.service: Add `Also` reference to
       ovs-record-hostname.service so that the service is enabled on install.
     - d/rules: Add `ovs-record-hostname.service` to package build.