[pve-devel] [RFC PATCH qemu-server 14/14] migrate: flush old VM conntrack entries after successful migration

[Christoph Heiss]

After a successful live-migration, the old VM-specific conntrack entries
are not needed anymore on the source node and can thus be flushed.

Signed-off-by: Christoph Heiss <c.heiss at proxmox.com>
---
Depends on patch #13 for pve-firewall & a bump thereof.

Marked RFC since technically this isn't really needed. But as we can now
easily filter/differentiate traffic on a per-VM basis thanks to the
connmark, we can flush them. It's a nice-to-have, optional cleanup,
IMHO.

 PVE/QemuMigrate.pm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/PVE/QemuMigrate.pm b/PVE/QemuMigrate.pm
index 7d32fc00..12723b4e 100644
--- a/PVE/QemuMigrate.pm
+++ b/PVE/QemuMigrate.pm
@@ -11,6 +11,7 @@ use Time::HiRes qw( usleep );
 use PVE::AccessControl;
 use PVE::Cluster;
 use PVE::Format qw(render_bytes);
+use PVE::Firewall::Helpers;
 use PVE::GuestHelpers qw(safe_boolean_ne safe_string_ne);
 use PVE::INotify;
 use PVE::JSONSchema;
@@ -1614,6 +1615,10 @@ sub phase3_cleanup {
 	    if (my $err = $@) {
 		$self->log('warn', "failed to stop dbus-vmstate on $targetnode: $err\n");
 	    }
+
+	    # also flush now-old local conntrack entries for the migrated VM
+	    $self->log('info', 'flushing conntrack state for guest on source');
+	    PVE::Firewall::Helpers::flush_fw_ct_entries_by_mark($vmid);
 	}
     }
 
-- 
2.48.1