3 #################################
4 # interface event script for ctdb
5 # this adds/removes IPs from your
11 [ -z "$CTDB_PUBLIC_ADDRESSES" ] && {
12 CTDB_PUBLIC_ADDRESSES=$CTDB_BASE/public_addresses
15 [ ! -f "$CTDB_PUBLIC_ADDRESSES" ] && {
16 echo "No public addresses file found. Nothing to do for 10.interfaces"
21 #############################
22 # called when ctdbd starts up
24 # make sure that we only respond to ARP messages from the NIC where
25 # a particular ip address is associated.
26 [ -f /proc/sys/net/ipv4/conf/all/arp_filter ] && {
27 echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
29 cat "$CTDB_PUBLIC_ADDRESSES" | cut -d/ -f1 | while read _IP; do
30 _IP_HELD=`/sbin/ip addr show | grep "inet $_IP/"`
31 [ -z "$_IP_HELD" ] || {
32 _IFACE=`echo $_IP_HELD | sed -e "s/.*\s//"`
33 _NM=`echo $_IP_HELD | sed -e "s/.*$_IP\///" -e "s/\s.*//"`
34 echo "Removing public address $_IP/$_NM from device $_IFACE"
35 /sbin/ip addr del $_IP/$_NM dev $_IFACE
41 ################################################
42 # called when ctdbd wants to claim an IP address
45 echo "must supply interface, IP and maskbits"
52 # we make sure the interface is up first
53 /sbin/ip link set $iface up || {
54 echo "Failed to bringup interface $iface"
57 /sbin/ip addr add $ip/$maskbits brd + dev $iface || {
58 echo "Failed to add $ip/$maskbits on dev $iface"
60 # cope with the script being killed while we have the interface blocked
61 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
63 # flush our route cache
64 echo 1 > /proc/sys/net/ipv4/route/flush
68 ##################################################
69 # called when ctdbd wants to release an IP address
72 echo "must supply interface, IP and maskbits"
76 # releasing an IP is a bit more complex than it seems. Once the IP
77 # is released, any open tcp connections to that IP on this host will end
78 # up being stuck. Some of them (such as NFS connections) will be unkillable
79 # so we need to use the killtcp ctdb function to kill them off. We also
80 # need to make sure that no new connections get established while we are
81 # doing this! So what we do is this:
82 # 1) firewall this IP, so no new external packets arrive for it
83 # 2) use netstat -tn to find existing connections, and kill them
84 # 3) remove the IP from the interface
85 # 4) remove the firewall rule
91 # we do an extra delete to cope with the script being killed
92 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
93 iptables -I INPUT -i $iface -d $ip -j DROP
94 kill_tcp_connections $ip
96 # the ip tool will delete all secondary IPs if this is the primary. To work around
97 # this _very_ annoying behaviour we have to keep a record of the secondaries and re-add
98 # them afterwards. yuck
100 if /sbin/ip addr list dev $iface primary | grep -q "inet $ip/$maskbits " ; then
101 secondaries=`/sbin/ip addr list dev $iface secondary | grep " inet " | awk '{print $2}'`
103 /sbin/ip addr del $ip/$maskbits dev $iface || failed=1
104 [ -z "$secondaries" ] || {
105 for i in $secondaries; do
106 if /sbin/ip addr list dev $iface | grep -q "inet $i" ; then
107 echo "kept secondary $i on dev $iface"
109 echo "re-adding secondary address $i to dev $iface"
110 /sbin/ip addr add $i dev $iface || failed=1
114 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
116 echo "Failed to del $ip on dev $iface"
120 # flush our route cache
121 echo 1 > /proc/sys/net/ipv4/route/flush
125 ###########################################
126 # called when ctdbd has finished a recovery
130 ####################################
131 # called when ctdbd is shutting down
136 INTERFACES=`cat $CTDB_PUBLIC_ADDRESSES |
137 sed -e "s/^[^\t ]*[\t ]*//" -e "s/[\t ]*$//"`
139 [ "$CTDB_PUBLIC_INTERFACE" ] && INTERFACES="$CTDB_PUBLIC_INTERFACE $INTERFACES"
140 [ "$CTDB_NATGW_PUBLIC_IFACE" ] && INTERFACES="$CTDB_NATGW_PUBLIC_IFACE $INTERFACES"
142 INTERFACES=`for IFACE in $INTERFACES ; do echo $IFACE ; done | sort | uniq`
144 for IFACE in $INTERFACES ; do
145 # These interfaces are sometimes bond devices
146 # When we use VLANs for bond interfaces, there will only
147 # be an entry in /proc for the underlying real interface
148 REALIFACE=`echo $IFACE |sed -e 's/\..*$//'`
149 [ -f /proc/net/bonding/$REALIFACE ] && {
150 grep -q 'Currently Active Slave: None' /proc/net/bonding/$REALIFACE && {
151 echo "ERROR: No active slaves for bond device $REALIFACE"
154 grep -q '^MII Status: up' /proc/net/bonding/$REALIFACE || {
155 echo "ERROR: public network interface $REALIFACE is down"
163 # we dont know how to test ib links
167 /usr/sbin/ethtool $IFACE | grep -q 'Link detected: yes' || {
168 # On some systems, this is not successful when a
169 # cable is plugged but the interface has not been
170 # brought up previously. Bring the interface up and
172 /sbin/ip link set $IFACE up
173 /usr/sbin/ethtool $IFACE | grep -q 'Link detected: yes' || {
174 echo "ERROR: No link on the public network interface $IFACE"
184 ctdb_standard_event_handler "$@"