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Fix live-migration with libvirt >= 6.8.0

libvirt 6.8.0 introduces virt-ssh-helper which prepends the libvirt
ssh command with a "which virt-ssh-helper". libvirt used to first
check for `nc` (netcat). But these two libvirt commits[1][2] have now
changed it to first look for `virt-ssh-helper`, if it not available,
then fall back to `nc`.

The nova-migration-wrapper doesn't accept this command and denies
the connection.

Until nova-migration-wrapper is changed to allow the usage of
virt-ssh-helper, this change force to use "netcat" (`nc`) by
appending to the migration URI: "&proxy=netcat"

[1] https://libvirt.org/git/?p=libvirt.git;a=commit;h=f8ec7c842d (rpc:
use new virt-ssh-helper binary for remote tunnelling, 2020-07-08)
[2] https://libvirt.org/git/?p=libvirt.git;a=commit;h=7d959c302d (rpc:
Fix virt-ssh-helper detection, 2020-10-27)

Closes-Bug: 1918250

Related: https://bugzilla.redhat.com/show_bug.cgi?id=1926602

Change-Id: I3db9cd42aa63379ed6332ee77f67d1dfe4be8504
Co-Authored-By: David Vallee Delisle <dvd@redhat.com>
(cherry picked from commit 04a97f92e4)
changes/82/779782/1
Martin Schuppert 1 month ago
committed by David Vallee Delisle
parent
commit
bf5a4a9849
2 changed files with 19 additions and 1 deletions
  1. +4
    -1
      manifests/profile/base/nova/migration/client.pp
  2. +15
    -0
      releasenotes/notes/nova_compute_live_migration_force_nc-f903a09955164ad9.yaml

+ 4
- 1
manifests/profile/base/nova/migration/client.pp View File

@ -70,7 +70,10 @@ class tripleo::profile::base::nova::migration::client (
configure_libvirt => $libvirt_enabled,
configure_nova => $nova_compute_enabled,
client_user => 'nova_migration',
client_extraparams => {'keyfile' => '/etc/nova/migration/identity'},
client_extraparams => {
'keyfile' => '/etc/nova/migration/identity',
'proxy' => 'netcat',
},
client_port => $ssh_port
}
}


+ 15
- 0
releasenotes/notes/nova_compute_live_migration_force_nc-f903a09955164ad9.yaml View File

@ -0,0 +1,15 @@
---
fixes:
- |
libvirt 6.8.0 introduces virt-ssh-helper which prepends the libvirt
ssh command with a "which virt-ssh-helper". libvirt used to first
check for `nc` (netcat). But these two libvirt commits[1][2] have now
changed it to first look for `virt-ssh-helper`, if it not available,
then fall back to `nc`. This trips up the 'nova-migration-wrapper' as
it does not support virt-ssh-helper atm.
Until this is implemented, this change force to use "netcat" (`nc`) by
appending to the migration URI: "&proxy=netcat"
[1] https://libvirt.org/git/?p=libvirt.git;a=commit;h=f8ec7c842d (rpc:
use new virt-ssh-helper binary for remote tunnelling, 2020-07-08)
[2] https://libvirt.org/git/?p=libvirt.git;a=commit;h=7d959c302d (rpc:
Fix virt-ssh-helper detection, 2020-10-27)

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