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|
#!/bin/sh
# script to manage the lvs ip multiplexer for a single public address cluster
[ -n "$CTDB_BASE" ] || \
CTDB_BASE=$(d=$(dirname "$0") ; cd -P "$d" ; dirname "$PWD")
. "${CTDB_BASE}/functions"
load_script_options
[ -n "$CTDB_LVS_NODES" ] || exit 0
export CTDB_LVS_NODES
# type is commonly supported and more portable than which(1)
# shellcheck disable=SC2039
if ! type ipvsadm >/dev/null 2>&1 ; then
echo "LVS configured but ipvsadm not found"
exit 0
fi
lvs_follower_only ()
{
_ip_address=$(ctdb_get_ip_address)
awk -v my_ip="$_ip_address" \
'$1 == my_ip { if ($2 ~ "follower-only") { exit 0 } else { exit 1 } }' \
"$CTDB_LVS_NODES"
}
lvs_check_config ()
{
[ -r "$CTDB_LVS_NODES" ] || \
die "error: CTDB_LVS_NODES=${CTDB_LVS_NODES} unreadable"
[ -n "$CTDB_LVS_PUBLIC_IP" ] || \
die "Invalid configuration: CTDB_LVS_PUBLIC_IP not set"
if ! lvs_follower_only ; then
[ -n "$CTDB_LVS_PUBLIC_IFACE" ] || \
die "Invalid configuration: CTDB_LVS_PUBLIC_IFACE not set"
fi
}
case "$1" in
setup)
lvs_check_config
;;
startup)
lvs_check_config
ipvsadm -D -t "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
ipvsadm -D -u "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
ip addr add "${CTDB_LVS_PUBLIC_IP}/32" dev lo scope host
# do not respond to ARPs that are for ip addresses with scope 'host'
set_proc_maybe sys/net/ipv4/conf/all/arp_ignore 3
# do not send out arp requests from loopback addresses
set_proc_maybe sys/net/ipv4/conf/all/arp_announce 2
;;
shutdown)
lvs_check_config
ipvsadm -D -t "$CTDB_LVS_PUBLIC_IP"
ipvsadm -D -u "$CTDB_LVS_PUBLIC_IP"
ip addr del "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
flush_route_cache
;;
ipreallocated)
lvs_check_config
# Kill connections
ipvsadm -D -t "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
ipvsadm -D -u "$CTDB_LVS_PUBLIC_IP" >/dev/null 2>&1
kill_tcp_connections_local_only \
"$CTDB_LVS_PUBLIC_IFACE" "$CTDB_LVS_PUBLIC_IP"
pnn=$(ctdb_get_pnn)
lvsleader=$("${CTDB_HELPER_BINDIR}/ctdb_lvs" leader)
if [ "$pnn" != "$lvsleader" ] ; then
# This node is not the LVS leader so change the IP address
# to have scope "host" so this node won't respond to ARPs
ip addr del "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
ip addr add "${CTDB_LVS_PUBLIC_IP}/32" dev lo scope host
exit 0
fi
# Change the scope so this node starts responding to ARPs
ip addr del "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
ip addr add "${CTDB_LVS_PUBLIC_IP}/32" dev lo >/dev/null 2>&1
ipvsadm -A -t "$CTDB_LVS_PUBLIC_IP" -p 1999999 -s lc
ipvsadm -A -u "$CTDB_LVS_PUBLIC_IP" -p 1999999 -s lc
# Add all nodes (except this node) as LVS servers
"${CTDB_HELPER_BINDIR}/ctdb_lvs" list |
awk -v pnn="$pnn" '$1 != pnn { print $2 }' |
while read ip ; do
ipvsadm -a -t "$CTDB_LVS_PUBLIC_IP" -r "$ip" -g
ipvsadm -a -u "$CTDB_LVS_PUBLIC_IP" -r "$ip" -g
done
# Add localhost too...
ipvsadm -a -t "$CTDB_LVS_PUBLIC_IP" -r 127.0.0.1
ipvsadm -a -u "$CTDB_LVS_PUBLIC_IP" -r 127.0.0.1
$CTDB gratarp \
"$CTDB_LVS_PUBLIC_IP" "$CTDB_LVS_PUBLIC_IFACE" >/dev/null 2>&1
flush_route_cache
;;
monitor)
lvs_check_config
if [ -n "$CTDB_LVS_PUBLIC_IFACE" ] ; then
interface_monitor "$CTDB_LVS_PUBLIC_IFACE" || exit 1
fi
;;
esac
exit 0
|
