ctdb/config/events/legacy/91.lvs.script

   1 #!/bin/sh
   2 # script to manage the lvs ip multiplexer for a single public address cluster
   3
   4 [ -n "$CTDB_BASE" ] || \
   5         CTDB_BASE=$(d=$(dirname "$0") && cd -P "$d" && dirname "$PWD")
   6
   7 . "${CTDB_BASE}/functions"
   8
   9 load_script_options
  10
  11 [ -n "$CTDB_LVS_NODES" ] || exit 0
  12 export CTDB_LVS_NODES
  13
  14 # type is commonly supported and more portable than which(1)
  15 # shellcheck disable=SC2039
  16 if ! type ipvsadm >/dev/null 2>&1 ; then
  17         echo "LVS configured but ipvsadm not found"
  18         exit 0
  19 fi
  20
  21
  22 lvs_follower_only ()
  23 {
  24         _ip_address=$(ctdb_get_ip_address)
  25         awk -v my_ip="$_ip_address" \
  26             '$1 == my_ip { if ($2 ~ "follower-only") { exit 0 } else { exit 1 } }' \
  27             "$CTDB_LVS_NODES"
  28 }
  29
  30 lvs_check_config ()
  31 {
  32         [ -r "$CTDB_LVS_NODES" ] || \
  33                 die "error: CTDB_LVS_NODES=${CTDB_LVS_NODES} unreadable"
  34         [ -n "$CTDB_LVS_PUBLIC_IP" ] || \
  35                 die "Invalid configuration: CTDB_LVS_PUBLIC_IP not set"
  36         if ! lvs_follower_only ; then
  37                 [ -n "$CTDB_LVS_PUBLIC_IFACE" ] || \
  38                         die "Invalid configuration: CTDB_LVS_PUBLIC_IFACE not set"
  39         fi
  40 }
  41
  42 case "$1" in
  43 setup)
  44         lvs_check_config
  45         ;;
  46 startup)
  47         lvs_check_config
  48
  49         ipvsadm -D -t "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
  50         ipvsadm -D -u "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
  51
  52         ip addr add "${CTDB_LVS_PUBLIC_IP}/32" dev lo scope host
  53
  54         # do not respond to ARPs that are for ip addresses with scope 'host'
  55         set_proc_maybe sys/net/ipv4/conf/all/arp_ignore 3
  56         # do not send out arp requests from loopback addresses
  57         set_proc_maybe sys/net/ipv4/conf/all/arp_announce 2
  58         ;;
  59
  60 shutdown)
  61         lvs_check_config
  62
  63         ipvsadm -D -t "$CTDB_LVS_PUBLIC_IP"
  64         ipvsadm -D -u "$CTDB_LVS_PUBLIC_IP"
  65
  66         ip addr del "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
  67
  68         flush_route_cache
  69         ;;
  70
  71 ipreallocated)
  72         lvs_check_config
  73
  74         # Kill connections
  75         ipvsadm -D -t "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
  76         ipvsadm -D -u "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
  77         kill_tcp_connections_local_only \
  78                 "$CTDB_LVS_PUBLIC_IFACE" "$CTDB_LVS_PUBLIC_IP"
  79
  80         pnn=$(ctdb_get_pnn)
  81         lvsleader=$("${CTDB_HELPER_BINDIR}/ctdb_lvs" leader)
  82         if [ "$pnn" != "$lvsleader" ] ; then
  83             # This node is not the LVS leader so change the IP address
  84             # to have scope "host" so this node won't respond to ARPs
  85             ip addr del "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
  86             ip addr add "${CTDB_LVS_PUBLIC_IP}/32" dev lo scope host
  87             exit 0
  88         fi
  89
  90         # Change the scope so this node starts responding to ARPs
  91         ip addr del "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
  92         ip addr add "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
  93
  94         ipvsadm -A -t "$CTDB_LVS_PUBLIC_IP" -p 1999999 -s lc
  95         ipvsadm -A -u "$CTDB_LVS_PUBLIC_IP" -p 1999999 -s lc
  96
  97         # Add all nodes (except this node) as LVS servers
  98         "${CTDB_HELPER_BINDIR}/ctdb_lvs" list |
  99         awk -v pnn="$pnn" '$1 != pnn { print $2 }' |
 100         while read ip ; do
 101                 ipvsadm -a -t "$CTDB_LVS_PUBLIC_IP" -r "$ip" -g
 102                 ipvsadm -a -u "$CTDB_LVS_PUBLIC_IP" -r "$ip" -g
 103         done
 104
 105         # Add localhost too...
 106         ipvsadm -a -t "$CTDB_LVS_PUBLIC_IP" -r 127.0.0.1
 107         ipvsadm -a -u "$CTDB_LVS_PUBLIC_IP" -r 127.0.0.1
 108
 109         $CTDB gratarp \
 110              "$CTDB_LVS_PUBLIC_IP" "$CTDB_LVS_PUBLIC_IFACE" >/dev/null 2>&1
 111
 112         flush_route_cache
 113         ;;
 114
 115 monitor)
 116         lvs_check_config
 117
 118         if [ -n "$CTDB_LVS_PUBLIC_IFACE" ] ; then
 119                 interface_monitor "$CTDB_LVS_PUBLIC_IFACE" || exit 1
 120         fi
 121         ;;
 122 esac
 123
 124 exit 0