I meet a second time a problem with a new slave Xen server installed for 3 weeks.
General network for VM is down suddenly.
The second time happened last night at about the same time a customer has reinstalled his vps.
In /var/log/messages, i can observe this for all VM interfaces :
Feb 8 02:00:56 s1 dhcpd: No subnet declaration for vifv1054.0-emu (no IPv4 addresses).
Feb 8 02:00:56 s1 dhcpd: ** Ignoring requests on vifv1054.0-emu. If this is not what
Feb 8 02:00:56 s1 dhcpd: you want, please write a subnet declaration
Feb 8 02:00:56 s1 dhcpd: in your dhcpd.conf file for the network segment
Feb 8 02:00:56 s1 dhcpd: to which interface vifv1054.0-emu is attached. **
dhcpd.conf looks good.
IP, mask, gateway are alright configured in the VM at this moment.
One hour later, DHCP informs VM about network infos :
Feb 8 02:01:56 s1 dhcpd: DHCPDISCOVER from 02:00:00:0e:db:64 via viifbr0
Feb 8 02:01:56 s1 dhcpd: DHCPOFFER on 164.0.01 to 02:00:00:0e:db:64 via viifbr0
I have restarted a lot of services but nothing :
ifdown eth0 && ifup eth0
service network restart
service dhcpd restart
service ebtables restart
service iptables restart
service libvirtd restart
service libvirt-guests restart
service virtnetwork restart
service zzvirtservice restart
The only way to get network up for all VM is to reboot this server.
So, why i get this probleme and how can i fix it please ?
CentOS release 6.7 (Final)
[root@s1 ~]# uname -a
Linux s1 4.1.15-4.el6xen.x86_64 #1 SMP Tue Dec 29 20:16:34 AEDT 2015 x86_64 x86_64 x86_64 GNU/Linux