# this adds/removes IPs from your
# public interface
-. /etc/ctdb/functions
-loadconfig ctdb
+. $CTDB_BASE/functions
+loadconfig
-cmd="$1"
-shift
+[ -z "$CTDB_PUBLIC_ADDRESSES" ] && {
+ CTDB_PUBLIC_ADDRESSES=$CTDB_BASE/public_addresses
+}
-[ -z "$CTDB_PUBLIC_INTERFACE" ] && {
- echo "Event script $0 : CTDB_PUBLIC_INTERFACE not set. Nothing to do."
- exit 0
+[ ! -f "$CTDB_PUBLIC_ADDRESSES" ] && {
+ echo "No public addresses file found. Nothing to do for 10.interfaces"
+ exit 0
}
+monitor_interfaces()
+{
+ local INTERFACES=`cat $CTDB_PUBLIC_ADDRESSES |
+ sed -e "s/^[^\t ]*[\t ]*//" -e "s/,/ /g" -e "s/[\t ]*$//"`
+
+ [ "$CTDB_PUBLIC_INTERFACE" ] && INTERFACES="$CTDB_PUBLIC_INTERFACE $INTERFACES"
+ [ "$CTDB_NATGW_PUBLIC_IFACE" ] && INTERFACES="$CTDB_NATGW_PUBLIC_IFACE $INTERFACES"
+
+ local IFACES=`ctdb ifaces -Y | grep -v '^:Name:LinkStatus:References:'`
+
+ local I
+ local IFACE
+
+ for I in $IFACES; do
+ IFACE=`echo -n "$I" | cut -d ':' -f2`
+ INTERFACES="$IFACE $INTERFACES"
+ done
+
+ INTERFACES=`for IFACE in $INTERFACES ; do echo $IFACE ; done | sort | uniq`
+
+ local fail=0
+ local force_fail=0
+ local ok=0
+ for IFACE in $INTERFACES ; do
+
+ local OLDLINK=`echo -n "$IFACES" | grep "^:$IFACE:" | cut -d ':' -f3 | xargs`
+ test -z "$OLDLINK" && {
+ force_fail=1
+ }
+
+ # These interfaces are sometimes bond devices
+ # When we use VLANs for bond interfaces, there will only
+ # be an entry in /proc for the underlying real interface
+ local REALIFACE=`echo $IFACE |sed -e 's/\..*$//'`
+ [ -f /proc/net/bonding/$REALIFACE ] && {
+ grep -q 'Currently Active Slave: None' /proc/net/bonding/$REALIFACE && {
+ echo "ERROR: No active slaves for bond device $REALIFACE"
+ fail=1
+ test -n "$OLDLINK" && {
+ ctdb setifacelink $IFACE down
+ }
+ continue;
+ }
+ grep -q '^MII Status: up' /proc/net/bonding/$REALIFACE || {
+ echo "ERROR: public network interface $REALIFACE is down"
+ fail=1
+ test -n "$OLDLINK" && {
+ ctdb setifacelink $IFACE down
+ }
+ continue;
+ }
+ test -n "$OLDLINK" && {
+ ok=1 # we only set ok for interfaces known to ctdbd
+ ctdb setifacelink $IFACE up
+ }
+ return 0;
+ }
+
+ case $IFACE in
+ ib*)
+ # we dont know how to test ib links
+ ;;
+ *)
+ [ -z "$IFACE" ] || {
+ [ "$(basename $(readlink /sys/class/net/$IFACE/device/driver))" = virtio_net ] ||
+ ethtool $IFACE | grep -q 'Link detected: yes' || {
+ # On some systems, this is not successful when a
+ # cable is plugged but the interface has not been
+ # brought up previously. Bring the interface up and
+ # try again...
+ /sbin/ip link set $IFACE up
+ ethtool $IFACE | grep -q 'Link detected: yes' || {
+ echo "ERROR: No link on the public network interface $IFACE"
+ fail=1
+ test -n "$OLDLINK" && {
+ ctdb setifacelink $IFACE down
+ }
+ continue
+ }
+ }
+ test -n "$OLDLINK" && {
+ ok=1 # we only set ok for interfaces known to ctdbd
+ ctdb setifacelink $IFACE up
+ }
+ }
+ ;;
+ esac
-case $cmd in
+ done
+
+ test x"$fail" = x"0" && {
+ return 0;
+ }
+
+ test x"$force_fail" != x"0" && {
+ return 1;
+ }
+
+ test x"$ok" = x"1" && {
+ return 2;
+ }
+
+ return 1;
+}
+
+case "$1" in
#############################
# called when ctdbd starts up
+ init)
+ # make sure that we only respond to ARP messages from the NIC where
+ # a particular ip address is associated.
+ [ -f /proc/sys/net/ipv4/conf/all/arp_filter ] && {
+ echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
+ }
+ cat "$CTDB_PUBLIC_ADDRESSES" | cut -d/ -f1 | while read _IP; do
+ _IP_HELD=`/sbin/ip addr show | grep "inet $_IP/"`
+ [ -z "$_IP_HELD" ] || {
+ _IFACE=`echo $_IP_HELD | sed -e "s/.*\s//"`
+ _NM=`echo $_IP_HELD | sed -e "s/.*$_IP\///" -e "s/\s.*//"`
+ echo "Removing public address $_IP/$_NM from device $_IFACE"
+ delete_ip_from_iface $_IFACE $_IP $_NM
+ }
+ done
+ ;;
+
+ #############################
+ # called after ctdbd has done its initial recovery
+ # and we start the services to become healthy
startup)
+ monitor_interfaces
+
;;
################################################
# called when ctdbd wants to claim an IP address
takeip)
- if [ $# != 3 ]; then
+ if [ $# != 4 ]; then
echo "must supply interface, IP and maskbits"
exit 1
fi
- iface=$1
- ip=$2
- maskbits=$3
+ iface=$2
+ ip=$3
+ maskbits=$4
- # we make sure the interface is up first
- /sbin/ip link set $iface up || {
- echo "`/bin/date` Failed to bringup interface $iface"
- exit 1
- }
- /sbin/ip addr add $ip/$maskbits dev $iface || {
- echo "`/bin/date` Failed to add $ip/$maskbits on dev $iface"
- exit 1
+ add_ip_to_iface $iface $ip $maskbits || {
+ exit 1;
}
+ # cope with the script being killed while we have the interface blocked
+ iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
+
# flush our route cache
echo 1 > /proc/sys/net/ipv4/route/flush
;;
##################################################
# called when ctdbd wants to release an IP address
releaseip)
- if [ $# != 3 ]; then
- echo "`/bin/date` must supply interface, IP and maskbits"
+ if [ $# != 4 ]; then
+ echo "must supply interface, IP and maskbits"
exit 1
fi
- iface=$1
- ip=$2
- maskbits=$3
- /sbin/ip addr del $ip/$maskbits dev $iface || {
- echo "`/bin/date` Failed to del $ip on dev $iface"
- exit 1
+
+ # releasing an IP is a bit more complex than it seems. Once the IP
+ # is released, any open tcp connections to that IP on this host will end
+ # up being stuck. Some of them (such as NFS connections) will be unkillable
+ # so we need to use the killtcp ctdb function to kill them off. We also
+ # need to make sure that no new connections get established while we are
+ # doing this! So what we do is this:
+ # 1) firewall this IP, so no new external packets arrive for it
+ # 2) use netstat -tn to find existing connections, and kill them
+ # 3) remove the IP from the interface
+ # 4) remove the firewall rule
+ iface=$2
+ ip=$3
+ maskbits=$4
+
+ failed=0
+ # we do an extra delete to cope with the script being killed
+ iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
+ iptables -I INPUT -i $iface -d $ip -j DROP
+ kill_tcp_connections $ip
+
+ delete_ip_from_iface $iface $ip $maskbits || {
+ iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
+ exit 1;
+ }
+
+ iptables -D INPUT -i $iface -d $ip -j DROP 2> /dev/null
+
+ # flush our route cache
+ echo 1 > /proc/sys/net/ipv4/route/flush
+ ;;
+
+ ##################################################
+ # called when ctdbd wants to update an IP address
+ updateip)
+ if [ $# != 5 ]; then
+ echo "must supply old interface, new interface, IP and maskbits"
+ exit 1
+ fi
+
+ # moving an IP is a bit more complex than it seems.
+ # First we drop all traffic on the old interface.
+ # Then we try to add the ip to the new interface and before
+ # we finally remove it from the old interface.
+ #
+ # 1) firewall this IP, so no new external packets arrive for it
+ # 2) add the IP to the new interface
+ # 3) remove the IP from the old interface
+ # 4) remove the firewall rule
+ # 5) use ctdb gratiousarp to propagate the new mac address
+ # 6) use netstat -tn to find existing connections, and tickle them
+ oiface=$2
+ niface=$3
+ ip=$4
+ maskbits=$5
+
+ failed=0
+ # we do an extra delete to cope with the script being killed
+ iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
+ iptables -I INPUT -i $oiface -d $ip -j DROP
+
+ # we make sure the interface is up first
+ add_ip_to_iface $niface $ip $maskbits || {
+ iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
+ exit 1;
+ }
+
+ delete_ip_from_iface $oiface $ip $maskbits || {
+ delete_ip_from_iface $niface $ip $maskbits
+ iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
+ exit 1;
}
+ # cope with the script being killed while we have the interface blocked
+ iptables -D INPUT -i $oiface -d $ip -j DROP 2> /dev/null
+
# flush our route cache
echo 1 > /proc/sys/net/ipv4/route/flush
+
+ # propagate the new mac address
+ ctdb gratiousarp $ip $niface
+
+ # tickle all existing connections, so that dropped packets
+ # are retransmited and the tcp streams work
+
+ tickle_tcp_connections $ip
+
;;
;;
monitor)
- [ -x /usr/sbin/ethtool ] && {
- /usr/sbin/ethtool $CTDB_PUBLIC_INTERFACE | grep 'Link detected: yes' > /dev/null || {
- echo "`date` ERROR: No link on the public network interface $CTDB_PUBLIC_INTERFACE"
- exit 1
- }
+ monitor_interfaces
+ ret=$?
+
+ test x"$ret" = x"2" && {
+ test x"$CTDB_PARTIALLY_ONLINE_INTERFACES" != x"yes" && {
+ exit 1;
+ }
+ # as long as we have one interface available don't become
+ # unhealthy
+ ret=0
}
- ;;
+ test x"$ret" != x"0" && {
+ exit 1;
+ }
+ ;;
+ *)
+ ctdb_standard_event_handler "$@"
+ ;;
esac
exit 0
+
git.samba.org / sahlberg / ctdb.git / blobdiff