ctdb/config/events.d/91.lvs

   1 #!/bin/sh
   2 # script to manage the lvs ip multiplexer for a single public address cluster
   3
   4 [ -n "$CTDB_BASE" ] || \
   5     export CTDB_BASE=$(cd -P $(dirname "$0") ; dirname "$PWD")
   6
   7 . $CTDB_BASE/functions
   8
   9 loadconfig ctdb
  10
  11 [ -z "$CTDB_LVS_PUBLIC_IP" ] && exit 0
  12 [ -z "$CTDB_PUBLIC_INTERFACE" ] && exit 0
  13
  14 [ -x /sbin/ipvsadm ] || {
  15     echo "LVS configured but /sbin/ipvsadm is not installed."
  16     exit 0
  17 }
  18
  19 case "$1" in
  20      startup)
  21         ipvsadm -D -t $CTDB_LVS_PUBLIC_IP:0
  22         ipvsadm -D -u $CTDB_LVS_PUBLIC_IP:0
  23
  24         ip addr add $CTDB_LVS_PUBLIC_IP/32 dev lo scope host >/dev/null 2>/dev/null
  25
  26         # do not respond to ARPs that are for ip addresses with scope 'host'
  27         echo 3 > /proc/sys/net/ipv4/conf/all/arp_ignore
  28         # do not send out arp requests from loopback addresses
  29         echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
  30         ;;
  31
  32      shutdown)
  33         ipvsadm -D -t $CTDB_LVS_PUBLIC_IP:0
  34         ipvsadm -D -u $CTDB_LVS_PUBLIC_IP:0
  35
  36         # remove the ip
  37         ip addr del $CTDB_LVS_PUBLIC_IP/32 dev lo >/dev/null 2>/dev/null
  38
  39         # flush our route cache
  40         echo 1 > /proc/sys/net/ipv4/route/flush
  41         ;;
  42
  43      recovered|ipreallocated)
  44         # kill off any tcp connections
  45         ipvsadm -D -t $CTDB_LVS_PUBLIC_IP:0
  46         ipvsadm -D -u $CTDB_LVS_PUBLIC_IP:0
  47         kill_tcp_connections_local_only $CTDB_LVS_PUBLIC_IP
  48
  49         ctdb_get_pnn
  50         LVSMASTER=`ctdb lvsmaster | sed -e "s/.*Node //" -e "s/ .*//"`
  51
  52         [ "$pnn" != "$LVSMASTER" ] && {
  53             # we are not the lvs master so we have to
  54             # change the ip address to have scope host so we wont respond
  55             # to arps
  56             ip addr del $CTDB_LVS_PUBLIC_IP/32 dev lo >/dev/null 2>/dev/null
  57             ip addr add $CTDB_LVS_PUBLIC_IP/32 dev lo scope host >/dev/null 2>/dev/null
  58             exit 0
  59         }
  60
  61         # change the scope so we start responding to arps
  62         ip addr del $CTDB_LVS_PUBLIC_IP/32 dev lo >/dev/null 2>/dev/null
  63         ip addr add $CTDB_LVS_PUBLIC_IP/32 dev lo >/dev/null 2>/dev/null
  64
  65         ipvsadm -A -t $CTDB_LVS_PUBLIC_IP:0 -p 1999999 -s lc
  66         ipvsadm -A -u $CTDB_LVS_PUBLIC_IP:0 -p 1999999 -s lc
  67
  68         # add all nodes (except ourselves) to the lvs config
  69         ctdb lvs | egrep -v "^${pnn}:" | sed -e "s/.*://" | while read IP; do
  70                 ipvsadm -a -t $CTDB_LVS_PUBLIC_IP:0 -r $IP -g
  71                 ipvsadm -a -u $CTDB_LVS_PUBLIC_IP:0 -r $IP -g
  72         done
  73         # and add the localhost too
  74         ipvsadm -a -t $CTDB_LVS_PUBLIC_IP:0 -r 127.0.0.1
  75         ipvsadm -a -u $CTDB_LVS_PUBLIC_IP:0 -r 127.0.0.1
  76
  77         # send out a gratious arp so our peers will update their arp tables
  78         ctdb gratiousarp $CTDB_LVS_PUBLIC_IP $CTDB_PUBLIC_INTERFACE >/dev/null 2>/dev/null
  79
  80         # flush our route cache
  81         echo 1 > /proc/sys/net/ipv4/route/flush
  82         ;;
  83
  84     *)
  85         ctdb_standard_event_handler "$@"
  86         ;;
  87 esac
  88
  89 exit 0