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| author | as0 <as3310@protonmail.com> | 2022-12-13 09:43:38 +0000 |
|---|---|---|
| committer | as0 <as3310@protonmail.com> | 2023-01-30 15:44:44 +0000 |
| commit | fba851bf3a34562db9cdb783ae539556b8b7a329 (patch) | |
| tree | 67003cf5bc6d1443bd399942f57ff146ce23e474 /releasenotes | |
| parent | 9e2fdb4470603bf3c4f0d21560cced1eb748cd1b (diff) | |
| download | nova-fba851bf3a34562db9cdb783ae539556b8b7a329.tar.gz | |
Add further workaround features for qemu_monitor_announce_self
In some cases on Arista VXLAN fabrics, VMs are inaccessible via network
after live migration, despite garps being observed on the fabric itself.
This patch builds on the feature
``[workarounds]/enable_qemu_monitor_announce_self`` feature as reported
in `bug 1815989 <https://bugs.launchpad.net/nova/+bug/1815989>`
This patch adds the ability to config the number of times the QEMU
announce_self monitor command is called, and add a new configuration option to
specify a delay between calling the announce_self command multiple times,
as in some cases, multiple announce_self monitor commands are required for
the fabric to honor the garp packets and the VM to become accessible via
the network after live migration.
Closes-Bug: #1996995
Change-Id: I2f5bf7c9de621bb1dc7fae5b3374629a4fcc1f46
Diffstat (limited to 'releasenotes')
| -rw-r--r-- | releasenotes/notes/bug-1996995-qemu_monitor_announce_self-add-configurables-2b2f19d238442f72.yaml | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/releasenotes/notes/bug-1996995-qemu_monitor_announce_self-add-configurables-2b2f19d238442f72.yaml b/releasenotes/notes/bug-1996995-qemu_monitor_announce_self-add-configurables-2b2f19d238442f72.yaml new file mode 100644 index 0000000000..0941dd7450 --- /dev/null +++ b/releasenotes/notes/bug-1996995-qemu_monitor_announce_self-add-configurables-2b2f19d238442f72.yaml @@ -0,0 +1,28 @@ +--- +fixes: + - | + Fixes `bug 1996995`_ in which VMs live migrated on certain VXLAN Arista + network fabrics were inaccessible until the switch arp cache expired. + + A Nova workaround option of ``enable_qemu_monitor_announce_self`` was added + to fix `bug 1815989`_ which when enabled would interact with the QEMU + monitor and force a VM to announce itself. + + On certain network fabrics, VMs that are live migrated remain inaccessible + via the network despite the QEMU monitor announce_self command successfully + being called. + + It was noted that on Arista VXLAN fabrics, testing showed that it required + several attempts of running the QEMU announce_self monitor command before + the switch would acknowledge a VM's new location on the fabric. + + This fix introduces two operator configurable options. + The first option sets the number of times the QEMU monitor announce_self + command is called - ``qemu_announce_self_count`` + + The second option allows operators to set the delay between the QEMU + announce_self commands in seconds for subsequent announce_self commands + with ``qemu_announce_self_interval`` + + .. _`bug 1996995`: https://bugs.launchpad.net/nova/+bug/1996995 + .. _`bug 1815989`: https://bugs.launchpad.net/nova/+bug/1815989 |