Quick guide: how to enable a second network card to xen virtual server.

2. make backup copy of /etc/xen/xend-config.sxp
  # cd /etc/xen/
  # cp xend-config.sxp xend-config.sxp.ori

3. edit the file (xend-config.sxp)
find this line:

(network-script network-bridge)

replace with :

(network-script multiplebridge.sh)

save and close.

4. edit the virtual domain config file (exp. /etc/xen/helios1)

find this line:
vif = [ 'mac=00:16:3e:5a:d8:28, bridge=xenbr0',]

add to the line new entry such as below
vif = [ 'mac=00:16:3e:5a:d8:28, bridge=xenbr0','mac=00:16:3e:5a:d8:38, bridge=xenbr1' ]

** make sure to change the mac address to something different than the other, in the exp. above
i just change 2 to 3 ( 28 --> 38).
*** the above example is for helios1 only, the mac address will not be the same for other servers.
save and close.

5. restart the network service.
  # service network restart
make sure that the second network card is started.

6. shutdown all virtual machine currently running.
# xm shutdown helios1

7. restart xend services
# service xend restart

8. make sure that the second bridge interface is enable..
# brctl show
bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no              vif3.0
                                                        peth0
                                                        vif0.0
xenbr1          8000.feffffffffff       no              vif3.1
                                                        peth1
                                                        vif0.1

# ifconfig

xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:765 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:152041 (148.4 KiB)  TX bytes:0 (0.0 b)

xenbr1    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:89 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:21396 (20.8 KiB)  TX bytes:0 (0.0 b)

9. start the virtual machine (helios1)

# xm create -c helios1

C . Configure the new interface in virtual machine

1. logon to the virtual machine as root.
# xm console helios1

2. make a copy of /etc/sysconfig/network-scripts/ifcfg-eth0 to ifcfg-eth1
# cd /etc/sysconfig/network-scripts/
# cp ifcfg-eth0 ifcfg-eth1

3. edit ifcfg-eth1, change the one in red. as below, set the new ip for the new interface ( 34.x network)
------[ original :ifcfg-eth1]-------
# Xen Virtual Ethernet
DEVICE=eth0  
BROADCAST=192.168.33.255
HWADDR=00:16:3E:5A:D8:28
IPADDR=192.168.33.60
NETMASK=255.255.255.0
NETWORK=192.168.33.0
ONBOOT=yes
GATEWAY=192.168.33.1   (DELETE)
TYPE=Ethernet
----------------------
------[ new :ifcfg-eth1]-------
# Xen Virtual Ethernet
DEVICE=eth1
BROADCAST=192.168.34.255
HWADDR=00:16:3E:5A:D8:38
IPADDR=192.168.34.60
NETMASK=255.255.255.0
NETWORK=192.168.34.0
ONBOOT=yes
TYPE=Ethernet
----------------------

save and close.

4. restart the network services.

# service network restart

5.  make sure that the new interface is enable..
# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:16:3E:5A:D8:28
          inet addr:192.168.33.60  Bcast:192.168.33.255  Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe5a:d828/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:694 errors:0 dropped:0 overruns:0 frame:0
          TX packets:34 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:149651 (146.1 KiB)  TX bytes:8196 (8.0 KiB)

eth1      Link encap:Ethernet  HWaddr 00:16:3E:5A:D8:38
          inet addr:192.168.34.60  Bcast:192.168.34.255  Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe5a:d838/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:34 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:8196 (8.0 KiB)


6. done.. that it.. the second nic is enable.. good luck.

p/s - the above example is from helios1_dom0 /helios1 , you can use it as a reference for the other servers, the scripts, running 2nd NIC etc.. it all there, just need to be connected to a switch

regards
adi.hazman/CDC