add missing bridge config in gnt-chi

howto/ganeti.md

@@ -1034,7 +1034,28 @@ address blocks reserved in the cluster.
  
         ifup eth1
 
- 6. allow modules to be loaded and reboot:
+ 6. setup a bridge on the public interface, replacing the `eth0` blocks
+    with something like:
+    
+        auto eth0
+        iface eth0 inet manual
+
+        auto br0
+        iface br0 inet static
+            address 38.229.82.104/24
+            gateway 38.229.82.1
+            bridge_ports eth0
+            bridge_stp off
+            bridge_fd 0
+
+        # IPv6 configuration
+        iface br0 inet6 static
+            accept_ra 0
+            address 2604:8800:5000:82:baca:3aff:fe5d:8774/64
+            gateway 2604:8800:5000:82::1
+
+ 6. allow modules to be loaded, cross your fingers that you didn't
+    screw up the network configuration above, and reboot:
  
         touch /etc/no_modules_disabled
         reboot
@@ -1076,6 +1097,7 @@ of the first Ganeti node when the `gnt-chi` cluster was setup:
 
     gnt-cluster init \
         --master-netdev eth1 \
+        --nic-parameters link=br0 \
         --vg-name vg_ganeti \
         --secondary-ip 172.30.130.1 \
         --enabled-hypervisors kvm \