additional configuration for network in openvz, used primarly to be able to set up bridges between container and host node

vznetcfg.custom

#!/usr/bin/env bash
# /usr/sbin/vznetcfg.custom

# originally from: http://wiki.openvz.org/Using_private_IPs_for_Hardware_Nodes

# a script to bring up bridged network interfaces (veth's) in a container
# modified 2012-03-11 to work with dhcp configured containers

GLOBALCONFIGFILE=/etc/vz/vz.conf
CTCONFIGFILE=/etc/vz/conf/$VEID.conf
vzctl=/usr/sbin/vzctl
brctl=/usr/sbin/brctl
ip=/sbin/ip
ifconfig=/sbin/ifconfig

# sourcing configs
. $GLOBALCONFIGFILE
. $CTCONFIGFILE

NETIF_OPTIONS=`echo $NETIF | sed 's/,/\n/g'`
for str in $NETIF_OPTIONS; do \
        # getting 'ifname' parameter value
        if  echo "$str" | grep -o "^ifname=" ; then
                # remove the parameter name from the string (along with '=')
                CTIFNAME=${str#*=};
        fi
        # getting 'host_ifname' parameter value
        if  echo "$str" | grep -o "^host_ifname=" ; then
                # remove the parameter name from the string (along with '=')
                VZHOSTIF=${str#*=};
        fi
done

# this is uncommented since it's not a requirement to have VETH_IP_ADDRESS
# for instance, when using dhcp incontainer

#if [ ! -n "$VETH_IP_ADDRESS" ]; then
#   echo "According to $CONFIGFILE CT$VEID has no veth IPs configured."
#   exit 1
#fi


if [ ! -n "$VZHOSTIF" ]; then
   echo "According to $CONFIGFILE CT$VEID has no veth interface configured."
   exit 1
fi

if [ ! -n "$CTIFNAME" ]; then
   echo "Corrupted $CONFIGFILE: no 'ifname' defined for host_ifname $VZHOSTIF."
   exit 1
fi

echo "Initializing interface $VZHOSTIF for CT$VEID."
$ifconfig $VZHOSTIF 0

CTROUTEDEV=$VZHOSTIF

if [ -n "$BRIDGEDEV" ]; then
   echo "Adding interface $VZHOSTIF to the bridge $BRIDGEDEV."
   CTROUTEDEV=$BRIDGEDEV
   $brctl addif $BRIDGEDEV $VZHOSTIF
fi

# Up the interface $CTIFNAME link in CT$VEID
$vzctl exec $VEID $ip link set $CTIFNAME up

for IP in $VETH_IP_ADDRESS; do
   echo "Adding an IP $IP to the $CTIFNAME for CT$VEID."
   $vzctl exec $VEID $ip address add $IP dev $CTIFNAME

   # removing the netmask
   IP_STRIP=${IP%%/*};

   echo "Adding a route from CT0 to CT$VEID using $IP_STRIP."
   $ip route add $IP_STRIP dev $CTROUTEDEV
done

if [ -n "$CT0_IP" ]; then
   echo "Adding a route from CT$VEID to CT0."
   $vzctl exec $VEID $ip route add $CT0_IP dev $CTIFNAME
fi

if [ -n "$VE_DEFAULT_GATEWAY" ]; then
   echo "Setting $VE_DEFAULT_GATEWAY as a default gateway for CT$VEID."
   $vzctl exec $VEID \
        $ip route add default via $VE_DEFAULT_GATEWAY dev $CTIFNAME
fi

exit 0