Can't connect to VM after live migration

[Sobq]

Hello everyone,

After I do a live migration of a vm to another node in a 3 node cluster; I cannot connect to it using it's ip address from the original node (when migration is done the ping from the node to the vm stops responding).

Following is the /etc/network file which is the same for all the nodes (the network card names do differ):


auto lo
iface lo inet loopback

iface lo inet6 loopback

auto enp8s0
iface enp8s0 inet static
address <>
gateway <>
up route add -net <> netmask 255.255.255.224 gw <> dev enp8s0

iface enp8s0 inet6 static
address <>
gateway <>

auto enp8s0.4000
iface enp8s0.4000 inet static
address 192.168.100.2
netmask 255.255.255.0
vlan-raw-device enp8s0
mtu 1400


iface eth0 inet manual

auto vmbr99
#private sub network
iface vmbr99 inet static
address 10.10.10.1
netmask 255.255.255.0
bridge-ports none
bridge-stp off
bridge-fd 0

post-up echo 1 > /proc/sys/net/ipv4/ip_forward
post-up iptables -t nat -A POSTROUTING -s '10.10.10.0/24' -o enp8s0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o enp8s0 -j MASQUERADE

post-up iptables -t raw -I PREROUTING -i fwbr+ -j CT --zone 1
post-down iptables -t raw -D PREROUTING -i fwbr+ -j CT --zone 1

 

[Sobq]

By the way the vm's use vmbr99 bridge

 

[fabian]

your 10.10.10.0/24 subnet is only valid on each node locally, not across nodes..

you might want to take a look at VXLAN: https://pve.proxmox.com/pve-docs/chapter-pvesdn.html#pvesdn_zone_plugin_vxlan

 

[Sobq]

could you explain

your 10.10.10.0/24 subnet is only valid on each node locally, not across nodes..

you might want to take a look at VXLAN: https://pve.proxmox.com/pve-docs/chapter-pvesdn.html#pvesdn_zone_plugin_vxlan

Could you expand on how this VXLAN can be used?

 

[fabian]

it allows you to span an overlay network across your nodes

 

[Sobq]

it allows you to span an overlay network across your nodes

Do you know any guide or tutorial on how it can be setup on Proxmox?
I'm a beginner in this field

 

[fabian]

then you might want to read up about networking basics and VXLAN. how to set it up in PVE is described in the linked chapter of the docs.