[Bug 2017757] Re: external-id.hostname is overwritten on each openvswtich service start with ovs 3.1

[Frode Nordahl]

Thank you for the bug report, Dmitriy.

Just wanted to note that in Ubuntu, the process of recording the
hostname is performed as a separate step in the boot process.  This is
done to ensure initial recording of the hostname is done after the
network is online, even when Open vSwitch itself is used to provide the
only uplink in a system.

As such, a workaround could also be to execute the following command:

    sudo systemctl mask ovs-record-hostname.service

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https://bugs.launchpad.net/bugs/2017757

Title:
  external-id.hostname is overwritten on each openvswtich service start
  with ovs 3.1

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive antelope series:
  Triaged
Status in openvswitch package in Ubuntu:
  Triaged
Status in openvswitch source package in Lunar:
  Triaged
Status in openvswitch source package in Mantic:
  Triaged

Bug description:
  In jammy/antelope repo openvswitch-common=3.1.0-1~cloud0 contain a
  buggy version of OVS that does not respect `ovs-vsctl add` command, so
  instead of appending values it does replace them.

  ```
  root at aio1:/home/ubuntu# ovs-vsctl list open .|grep hostname
  external_ids        : {hostname=aio1.openstack.local, ovn-bridge-mappings="vlan:br-provider,lbaas:br-octavia", ovn-cms-options=enable-chassis-as-gw, ovn-encap-ip="172.29.240.100", ovn-encap-type=geneve, ovn-remote="ssl:172.29.236.100:6642", rundir="/var/run/openvswitch", system-id="bbad02ce-ab79-42c0-8f54-ce0b7e732c59"}
  root at aio1:/home/ubuntu# ovs-vsctl set open_vswitch . external-ids:hostname=aio1
  root at aio1:/home/ubuntu# ovs-vsctl list open .|grep hostname
  external_ids        : {hostname=aio1, ovn-bridge-mappings="vlan:br-provider,lbaas:br-octavia", ovn-cms-options=enable-chassis-as-gw, ovn-encap-ip="172.29.240.100", ovn-encap-type=geneve, ovn-remote="ssl:172.29.236.100:6642", rundir="/var/run/openvswitch", system-id="bbad02ce-ab79-42c0-8f54-ce0b7e732c59"}
  root at aio1:/home/ubuntu# ovs-vsctl list open .|grep hostname
  external_ids        : {hostname=aio1.openstack.local, ovn-bridge-mappings="vlan:br-provider,lbaas:br-octavia", ovn-cms-options=enable-chassis-as-gw, ovn-encap-ip="172.29.240.100", ovn-encap-type=geneve, ovn-remote="ssl:172.29.236.100:6642", rundir="/var/run/openvswitch", system-id="bbad02ce-ab79-42c0-8f54-ce0b7e732c59"}
  root at aio1:/home/ubuntu#

  root at aio1:/home/ubuntu# apt info openvswitch-common
  Package: openvswitch-common
  Version: 3.1.0-1~cloud0
  Priority: optional
  Section: net
  Source: openvswitch
  Maintainer: Debian OpenStack <team+openstack at tracker.debian.org>
  Installed-Size: 3359 kB
  Depends: openssl, python3:any, libc6 (>= 2.34), libcap-ng0 (>= 0.7.9), libssl3 (>= 3.0.0~~alpha1), libunbound8 (>= 1.8.0)
  Suggests: ethtool, openvswitch-doc
  Breaks: openvswitch-switch (<< 2.13.0~git20200212.15ae9db33-0ubuntu2~)
  Replaces: openvswitch-switch (<< 2.13.0~git20200212.15ae9db33-0ubuntu2~)
  Download-Size: 1061 kB
  APT-Manual-Installed: yes
  APT-Sources: http://ubuntu-cloud.archive.canonical.com/ubuntu jammy-updates/antelope/main amd64 Packages
  Description: Open vSwitch common components
   Open vSwitch is a production quality, multilayer, software-based,
   Ethernet virtual switch. It is designed to enable massive network
   automation through programmatic extension, while still supporting
   standard management interfaces and protocols (e.g. NetFlow, IPFIX,
   sFlow, SPAN, RSPAN, CLI, LACP, 802.1ag). In addition, it is designed
   to support distribution across multiple physical servers similar to
   VMware's vNetwork distributed vswitch or Cisco's Nexus 1000V.
   .
   openvswitch-common provides components required by both openvswitch-switch
   and openvswitch-testcontroller.

  N: There are 2 additional records. Please use the '-a' switch to see them.
  root at aio1:/home/ubuntu# 

  ```

  This can be workarounded with setting `OPTIONS="--no-record-hostname"`
  in /etc/default/openvswitch-switch

  Path in OVS has been already proposed:
  https://mail.openvswitch.org/pipermail/ovs-dev/2023-March/403255.html

  Related bug to RDO:
  https://bugzilla.redhat.com/show_bug.cgi?id=2182767

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