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"
22 local INTERFACES=`cat $CTDB_PUBLIC_ADDRESSES |
23 sed -e "s/^[^\t ]*[\t ]*//" -e "s/,/ /g" -e "s/[\t ]*$//"`
25 [ "$CTDB_PUBLIC_INTERFACE" ] && INTERFACES="$CTDB_PUBLIC_INTERFACE $INTERFACES"
26 [ "$CTDB_NATGW_PUBLIC_IFACE" ] && INTERFACES="$CTDB_NATGW_PUBLIC_IFACE $INTERFACES"
28 local IFACES=`ctdb ifaces -Y | grep -v '^:Name:LinkStatus:References:'`
34 IFACE=`echo -n "$I" | cut -d ':' -f2`
35 INTERFACES="$IFACE $INTERFACES"
38 INTERFACES=`for IFACE in $INTERFACES ; do echo $IFACE ; done | sort | uniq`
43 for IFACE in $INTERFACES ; do
45 local OLDLINK=`echo -n "$IFACES" | grep "^:$IFACE:" | cut -d ':' -f3 | xargs`
46 test -z "$OLDLINK" && {
50 # These interfaces are sometimes bond devices
51 # When we use VLANs for bond interfaces, there will only
52 # be an entry in /proc for the underlying real interface
53 local REALIFACE=`echo $IFACE |sed -e 's/\..*$//'`
54 [ -f /proc/net/bonding/$REALIFACE ] && {
55 grep -q 'Currently Active Slave: None' /proc/net/bonding/$REALIFACE && {
56 echo "ERROR: No active slaves for bond device $REALIFACE"
58 test -n "$OLDLINK" && {
59 ctdb setifacelink $IFACE down
63 grep -q '^MII Status: up' /proc/net/bonding/$REALIFACE || {
64 echo "ERROR: public network interface $REALIFACE is down"
66 test -n "$OLDLINK" && {
67 ctdb setifacelink $IFACE down
71 test -n "$OLDLINK" && {
72 ok=1 # we only set ok for interfaces known to ctdbd
73 ctdb setifacelink $IFACE up
80 # we dont know how to test ib links
84 [ "$(basename $(readlink /sys/class/net/$IFACE/device/driver))" = virtio_net ] ||
85 ethtool $IFACE | grep -q 'Link detected: yes' || {
86 # On some systems, this is not successful when a
87 # cable is plugged but the interface has not been
88 # brought up previously. Bring the interface up and
90 /sbin/ip link set $IFACE up
91 ethtool $IFACE | grep -q 'Link detected: yes' || {
92 echo "ERROR: No link on the public network interface $IFACE"
94 test -n "$OLDLINK" && {
95 ctdb setifacelink $IFACE down
100 test -n "$OLDLINK" && {
101 ok=1 # we only set ok for interfaces known to ctdbd
102 ctdb setifacelink $IFACE up
110 test x"$fail" = x"0" && {
114 test x"$force_fail" != x"0" && {
118 test x"$ok" = x"1" && {
126 #############################
127 # called when ctdbd starts up
129 # make sure that we only respond to ARP messages from the NIC where
130 # a particular ip address is associated.
131 [ -f /proc/sys/net/ipv4/conf/all/arp_filter ] && {
132 echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
134 cat "$CTDB_PUBLIC_ADDRESSES" | cut -d/ -f1 | while read _IP; do
135 _IP_HELD=`/sbin/ip addr show | grep "inet $_IP/"`
136 [ -z "$_IP_HELD" ] || {
137 _IFACE=`echo $_IP_HELD | sed -e "s/.*\s//"`
138 _NM=`echo $_IP_HELD | sed -e "s/.*$_IP\///" -e "s/\s.*//"`
139 echo "Removing public address $_IP/$_NM from device $_IFACE"
140 delete_ip_from_iface $_IFACE $_IP $_NM
145 #############################
146 # called after ctdbd has done its initial recovery
147 # and we start the services to become healthy
154 ################################################
155 # called when ctdbd wants to claim an IP address
158 echo "must supply interface, IP and maskbits"
165 add_ip_to_iface $iface $ip $maskbits || {
169 # cope with the script being killed while we have the interface blocked
170 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
172 # flush our route cache
173 echo 1 > /proc/sys/net/ipv4/route/flush
177 ##################################################
178 # called when ctdbd wants to release an IP address
181 echo "must supply interface, IP and maskbits"
185 # releasing an IP is a bit more complex than it seems. Once the IP
186 # is released, any open tcp connections to that IP on this host will end
187 # up being stuck. Some of them (such as NFS connections) will be unkillable
188 # so we need to use the killtcp ctdb function to kill them off. We also
189 # need to make sure that no new connections get established while we are
190 # doing this! So what we do is this:
191 # 1) firewall this IP, so no new external packets arrive for it
192 # 2) use netstat -tn to find existing connections, and kill them
193 # 3) remove the IP from the interface
194 # 4) remove the firewall rule
200 # we do an extra delete to cope with the script being killed
201 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
202 iptables -I INPUT -i $iface -d $ip -j DROP
203 kill_tcp_connections $ip
205 delete_ip_from_iface $iface $ip $maskbits || {
206 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
210 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
212 # flush our route cache
213 echo 1 > /proc/sys/net/ipv4/route/flush
216 ##################################################
217 # called when ctdbd wants to update an IP address
220 echo "must supply old interface, new interface, IP and maskbits"
224 # moving an IP is a bit more complex than it seems.
225 # First we drop all traffic on the old interface.
226 # Then we try to add the ip to the new interface and before
227 # we finally remove it from the old interface.
229 # 1) firewall this IP, so no new external packets arrive for it
230 # 2) add the IP to the new interface
231 # 3) remove the IP from the old interface
232 # 4) remove the firewall rule
233 # 5) use ctdb gratiousarp to propagate the new mac address
234 # 6) use netstat -tn to find existing connections, and tickle them
241 # we do an extra delete to cope with the script being killed
242 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
243 iptables -I INPUT -i $oiface -d $ip -j DROP
245 # we make sure the interface is up first
246 add_ip_to_iface $niface $ip $maskbits || {
247 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
251 delete_ip_from_iface $oiface $ip $maskbits || {
252 delete_ip_from_iface $niface $ip $maskbits
253 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
257 # cope with the script being killed while we have the interface blocked
258 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
260 # flush our route cache
261 echo 1 > /proc/sys/net/ipv4/route/flush
263 # propagate the new mac address
264 ctdb gratiousarp $ip $niface
266 # tickle all existing connections, so that dropped packets
267 # are retransmited and the tcp streams work
269 tickle_tcp_connections $ip
274 ###########################################
275 # called when ctdbd has finished a recovery
279 ####################################
280 # called when ctdbd is shutting down
288 test x"$ret" = x"2" && {
289 test x"$CTDB_PARTIALLY_ONLINE_INTERFACES" != x"yes" && {
292 # as long as we have one interface available don't become
297 test x"$ret" != x"0" && {
302 ctdb_standard_event_handler "$@"