A virtual machine gets migrated online from a node with Virtuozzo 6.0 Update 10 (or earlier) to a node with Update 11 (or later). The VM contains 2 network interfaces, the secondary one being a routed adapter, a typical configuration in OACI environment.
As a result, a virtual machine loses network connectivity on private network, which is configured on the network adapter in routed mode.
The IP address assigned to the corresponding vme* interface on the hardware node changed from 220.127.116.11 to 169.254.0.1, but the route inside the VM didn't reflect the change:
root@test:/# ip r l 18.104.22.168 dev eth3 scope link
Virtuozzo 6.0 Update 11 brings a change to the default gateway for routed adapters to comply with the APIPA standard address range change in scope of RFC-3927. During online migration, no network reconfiguration occurs inside the VM, so the new route is not present.
In order to bring the VM connectivity back, two options are possible:
add the needed route manually in the VM:
# ip route add 169.254.0.1 dev eth3 scope link
where "eth3" is the actual name of the interface that can be found from the output of
route add -P 169.254.0.1 mask 255.255.255.255 169.254.0.1 if <ID>
is the ID of the routed interface that can be found from the output of
- (or) restart the VM
It is also recommended to update guest tools inside the virtual machine to correct the issue: