diff options
Diffstat (limited to 'ctdb/config/events/legacy/91.lvs.script')
| -rwxr-xr-x | ctdb/config/events/legacy/91.lvs.script | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/ctdb/config/events/legacy/91.lvs.script b/ctdb/config/events/legacy/91.lvs.script new file mode 100755 index 0000000..8855068 --- /dev/null +++ b/ctdb/config/events/legacy/91.lvs.script @@ -0,0 +1,124 @@ +#!/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 |