[pve-devel] [PATCH pve-manager 1/1] pve8to9: add check for interfaces
Stefan Hanreich
s.hanreich at proxmox.com
Thu Jul 17 19:50:18 CEST 2025
PVE 9 will automatically set the host_mtu parameter for VMs to the
bridge MTU if the MTU field of the network device is unset. Check for
any interface that would be affected by a change in MTU after the
upgrade.
Signed-off-by: Stefan Hanreich <s.hanreich at proxmox.com>
---
only works with current stable-bookworm branch, since the QemuServer
functions moved
PVE/CLI/pve8to9.pm | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/PVE/CLI/pve8to9.pm b/PVE/CLI/pve8to9.pm
index e70b162aa..f76b188f5 100644
--- a/PVE/CLI/pve8to9.pm
+++ b/PVE/CLI/pve8to9.pm
@@ -19,6 +19,7 @@ use PVE::Corosync;
use PVE::INotify;
use PVE::Jobs;
use PVE::JSONSchema;
+use PVE::Network;
use PVE::NodeConfig;
use PVE::RPCEnvironment;
use PVE::Storage;
@@ -1747,6 +1748,28 @@ sub check_glusterfs_storage_usage {
return undef;
}
+sub check_bridge_mtu {
+ log_info("Checking for VirtIO devices that would change their MTU...");
+
+ my $vms = PVE::QemuServer::config_list();
+
+ for my $vmid (sort { $a <=> $b } keys %$vms) {
+ my $config = PVE::QemuConfig->load_config($vmid);
+
+ for my $opt (sort keys $config->%*) {
+ next if $opt !~ m/^net\d+$/;
+ my $net = PVE::QemuServer::parse_net($config->{$opt});
+
+ next if $net->{model} ne 'virtio' || defined($net->{mtu});
+
+ my $bridge_mtu = PVE::Network::read_bridge_mtu($net->{bridge});
+
+ log_notice("network interface $opt of vm $vmid will have its mtu forced to $bridge_mtu")
+ if $bridge_mtu != 1500;
+ }
+ }
+}
+
sub check_misc {
print_header("MISCELLANEOUS CHECKS");
my $ssh_config = eval { PVE::Tools::file_get_contents('/root/.ssh/config') };
@@ -1859,6 +1882,7 @@ sub check_misc {
check_legacy_notification_sections();
check_legacy_backup_job_options();
check_lvm_autoactivation();
+ check_bridge_mtu();
}
my sub colored_if {
--
2.39.5
More information about the pve-devel
mailing list