2 # Script to set up one of the nodes as a NAT gateway for all other nodes.
3 # This is used to ensure that all nodes in the cluster can still originate
4 # traffic to the external network even if there are no public addresses
11 [ -z "$CTDB_NATGW_PUBLIC_IFACE" ] && exit 0
14 local _ip=`echo $CTDB_NATGW_PUBLIC_IP | cut -d '/' -f1`
15 local _maskbits=`echo $CTDB_NATGW_PUBLIC_IP | cut -d '/' -f2`
17 delete_ip_from_iface $CTDB_NATGW_PUBLIC_IFACE $_ip $_maskbits
18 delete_ip_from_iface lo $_ip 32
20 ip route del 0.0.0.0/0 metric 10 >/dev/null 2>/dev/null
22 # Delete the masquerading setup from a previous iteration where we
24 iptables -D POSTROUTING -t nat -s $CTDB_NATGW_PRIVATE_NETWORK -d ! $CTDB_NATGW_PRIVATE_NETWORK -j MASQUERADE >/dev/null 2>/dev/null
26 # remove any iptables rule we may have on this address
27 iptables -D INPUT -p tcp --syn -d _ip/32 -j REJECT 2>/dev/null
32 [ -z "$CTDB_PUBLIC_ADDRESSES" ] && {
33 CTDB_PUBLIC_ADDRESSES=/etc/ctdb/public_addresses
35 egrep "^$CTDB_NATGW_PUBLIC_IP[ \t]" $CTDB_PUBLIC_ADDRESSES >/dev/null
37 echo ERROR: NATGW configured to use a public address. NATGW must not use a public address.
41 # do not respond to ARPs that are for ip addresses with scope 'host'
42 echo 3 > /proc/sys/net/ipv4/conf/all/arp_ignore
43 # do not send out arp requests from loopback addresses
44 echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
45 # update capabilities to show we are using natgw
49 recovered|updatenatgw)
50 MYPNN=`ctdb pnn | cut -d: -f2`
51 NATGWMASTER=`ctdb natgwlist | head -1 | sed -e "s/ .*//"`
52 NATGWIP=`ctdb natgwlist | head -1 | sed -e "s/^[^ ]* *//"`
54 CTDB_NATGW_PUBLIC_IP_HOST=`echo $CTDB_NATGW_PUBLIC_IP | sed -e "s/\/.*/\/32/"`
56 # block all incoming connections to the natgw address
57 iptables -D INPUT -p tcp --syn -d $CTDB_NATGW_PUBLIC_IP_HOST -j REJECT 2>/dev/null
58 iptables -I INPUT -p tcp --syn -d $CTDB_NATGW_PUBLIC_IP_HOST -j REJECT 2>/dev/null
61 if [ "$NATGWMASTER" = "-1" ]; then
62 echo "There is not NATGW master node"
68 if [ "$MYPNN" = "$NATGWMASTER" ]; then
69 # This is the first node, set it up as the NAT GW
70 echo 1 >/proc/sys/net/ipv4/ip_forward
71 iptables -A POSTROUTING -t nat -s $CTDB_NATGW_PRIVATE_NETWORK -d ! $CTDB_NATGW_PRIVATE_NETWORK -j MASQUERADE
73 # block all incoming connections to the natgw address
74 CTDB_NATGW_PUBLIC_IP_HOST=`echo $CTDB_NATGW_PUBLIC_IP | sed -e "s/\/.*/\/32/"`
75 iptables -D INPUT -p tcp --syn -d $CTDB_NATGW_PUBLIC_IP_HOST -j REJECT 2>/dev/null
76 iptables -I INPUT -p tcp --syn -d $CTDB_NATGW_PUBLIC_IP_HOST -j REJECT 2>/dev/null
78 ip addr add $CTDB_NATGW_PUBLIC_IP dev $CTDB_NATGW_PUBLIC_IFACE
79 ip route add 0.0.0.0/0 via $CTDB_NATGW_DEFAULT_GATEWAY >/dev/null 2>/dev/null
81 # This is not the NAT-GW
82 # Assign the public ip to the private interface and make
83 # sure we dont respond to ARPs.
84 # We do this so that the ip address will exist on a
85 # non-loopback interface so that samba may send it along in the
87 ip addr add $CTDB_NATGW_PUBLIC_IP_HOST dev lo scope host
88 ip route add 0.0.0.0/0 via $NATGWIP metric 10
91 # flush our route cache
92 echo 1 > /proc/sys/net/ipv4/route/flush
95 shutdown|stopped|removenatgw)
100 ctdb_standard_event_handler "@"