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 if [ "$1" = "init" ]; then
17 echo "No public addresses file found. Nothing to do for 10.interfaces"
24 up_interfaces_found=true
25 ctdb setifacelink $1 up >/dev/null 2>&1
31 ctdb setifacelink $1 down >/dev/null 2>&1
34 # This sets $all_interfaces as a side-effect.
37 # Get all the interfaces listed in the public_addresses file
38 all_interfaces=$(sed -e "s/^[^\t ]*[\t ]*//" -e "s/,/ /g" -e "s/[\t ]*$//" $CTDB_PUBLIC_ADDRESSES)
40 # Add some special interfaces if they're defined
41 [ "$CTDB_PUBLIC_INTERFACE" ] && all_interfaces="$CTDB_PUBLIC_INTERFACE $all_interfaces"
42 [ "$CTDB_NATGW_PUBLIC_IFACE" ] && all_interfaces="$CTDB_NATGW_PUBLIC_IFACE $all_interfaces"
44 # For all but the 1st line, get the 2nd last field with commas
46 ctdb_ifaces=$(ctdb -Y ip -v | sed -e '1d' -e 's/:[^:]*:$//' -e 's/^.*://' -e 's/,/ /g')
48 # Add $ctdb_interfaces and uniquify
49 all_interfaces=$(echo $all_interfaces $ctdb_ifaces | tr ' ' '\n' | sort -u)
57 up_interfaces_found=false
59 for iface in $all_interfaces ; do
61 ip addr show $iface 2>/dev/null >/dev/null || {
62 echo "WARNING: Interface $iface does not exist but it is used by public addresses."
66 # These interfaces are sometimes bond devices
67 # When we use VLANs for bond interfaces, there will only
68 # be an entry in /proc for the underlying real interface
69 realiface=`echo $iface |sed -e 's/\..*$//'`
70 bi=$(get_proc "net/bonding/$realiface" 2>/dev/null) && {
71 echo "$bi" | grep -q 'Currently Active Slave: None' && {
72 echo "ERROR: No active slaves for bond device $realiface"
76 echo "$bi" | grep -q '^MII Status: up' || {
77 echo "ERROR: public network interface $realiface is down"
81 echo "$bi" | grep -q '^Bonding Mode: IEEE 802.3ad Dynamic link aggregation' && {
82 # This works around a bug in the driver where the
83 # overall bond status can be up but none of the actual
84 # physical interfaces have a link.
85 echo "$bi" | grep 'MII Status:' | tail -n +2 | grep -q '^MII Status: up' || {
86 echo "ERROR: No active slaves for 802.ad bond device $realiface"
97 # loopback is always working
101 # we dont know how to test ib links
106 [ "$(basename $(readlink /sys/class/net/$iface/device/driver) 2>/dev/null)" = virtio_net ] ||
107 ethtool $iface | grep -q 'Link detected: yes' || {
108 # On some systems, this is not successful when a
109 # cable is plugged but the interface has not been
110 # brought up previously. Bring the interface up and
112 ip link set $iface up
113 ethtool $iface | grep -q 'Link detected: yes' || {
114 echo "ERROR: No link on the public network interface $iface"
128 $up_interfaces_found && \
129 [ "$CTDB_PARTIALLY_ONLINE_INTERFACES" = "yes" ] && \
138 #############################
139 # called when ctdbd starts up
141 # make sure that we only respond to ARP messages from the NIC where
142 # a particular ip address is associated.
143 get_proc sys/net/ipv4/conf/all/arp_filter >/dev/null 2>&1 && {
144 set_proc sys/net/ipv4/conf/all/arp_filter 1
148 #############################
149 # called after ctdbd has done its initial recovery
150 # and we start the services to become healthy
152 # Assume all links are good initially
154 for iface in $all_interfaces ; do
155 ctdb setifacelink $iface up >/dev/null 2>/dev/null
163 ################################################
164 # called when ctdbd wants to claim an IP address
170 add_ip_to_iface $iface $ip $maskbits || {
174 # cope with the script being killed while we have the interface blocked
175 iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
177 # flush our route cache
178 set_proc sys/net/ipv4/route/flush 1
182 ##################################################
183 # called when ctdbd wants to release an IP address
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 set_proc sys/net/ipv4/route/flush 1
216 ##################################################
217 # called when ctdbd wants to update an IP address
219 # moving an IP is a bit more complex than it seems.
220 # First we drop all traffic on the old interface.
221 # Then we try to add the ip to the new interface and before
222 # we finally remove it from the old interface.
224 # 1) firewall this IP, so no new external packets arrive for it
225 # 2) add the IP to the new interface
226 # 3) remove the IP from the old interface
227 # 4) remove the firewall rule
228 # 5) use ctdb gratiousarp to propagate the new mac address
229 # 6) use netstat -tn to find existing connections, and tickle them
236 # we do an extra delete to cope with the script being killed
237 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
238 iptables -I INPUT -i $oiface -d $ip -j DROP
240 delete_ip_from_iface $oiface $ip $maskbits 2>/dev/null
241 delete_ip_from_iface $niface $ip $maskbits 2>/dev/null
243 add_ip_to_iface $niface $ip $maskbits || {
244 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
248 # cope with the script being killed while we have the interface blocked
249 iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
251 # flush our route cache
252 set_proc sys/net/ipv4/route/flush 1
254 # propagate the new mac address
255 ctdb gratiousarp $ip $niface
257 # tickle all existing connections, so that dropped packets
258 # are retransmited and the tcp streams work
260 tickle_tcp_connections $ip
265 ###########################################
266 # called when ctdbd has finished a recovery
270 ####################################
271 # called when ctdbd is shutting down
276 monitor_interfaces || exit 1
279 ctdb_standard_event_handler "$@"