/* Remove a realserver IPVS rule */
static int
clear_service_rs(virtual_server_t * vs, list l)
{
element e;
real_server_t *rs;
long weight_sum;
long down_threshold = vs->quorum - vs->hysteresis;
for (e = LIST_HEAD(l); e; ELEMENT_NEXT(e)) {
rs = ELEMENT_DATA(e);
if (ISALIVE(rs)) {
log_message(LOG_INFO, "Removing service %s from VS %s"
, FMT_RS(rs)
, FMT_VS(vs));
if (!ipvs_cmd(LVS_CMD_DEL_DEST, vs, rs))
return 0;
UNSET_ALIVE(rs);
if (!vs->omega)
continue;
/* In Omega mode we call VS and RS down notifiers
* all the way down the exit, as necessary.
*/
if (rs->notify_down) {
log_message(LOG_INFO, "Executing [%s] for service %s in VS %s"
, rs->notify_down
, FMT_RS(rs)
, FMT_VS(vs));
notify_exec(rs->notify_down);
}
#ifdef _WITH_SNMP_
check_snmp_rs_trap(rs, vs);
#endif
/* Sooner or later VS will lose the quorum (if any). However,
* we don't push in a sorry server then, hence the regression
* is intended.
*/
weight_sum = weigh_live_realservers(vs);
if (vs->quorum_state == UP && (
!weight_sum ||
weight_sum < down_threshold)
) {
vs->quorum_state = DOWN;
if (vs->quorum_down) {
log_message(LOG_INFO, "Executing [%s] for VS %s"
, vs->quorum_down
, FMT_VS(vs));
notify_exec(vs->quorum_down);
}
#ifdef _WITH_SNMP_
check_snmp_quorum_trap(vs);
#endif
}
}
}
return 1;
}
/* set quorum state depending on current weight of real servers */
static void
update_quorum_state(virtual_server_t * vs)
{
long weight_sum = weigh_live_realservers(vs);
long up_threshold = vs->quorum + vs->hysteresis;
long down_threshold = vs->quorum - vs->hysteresis;
/* If we have just gained quorum, it's time to consider notify_up. */
if (vs->quorum_state == DOWN &&
weight_sum >= up_threshold) {
vs->quorum_state = UP;
log_message(LOG_INFO, "Gained quorum %lu+%lu=%li <= %li for VS %s"
, vs->quorum
, vs->hysteresis
, up_threshold
, weight_sum
, FMT_VS(vs));
if (vs->s_svr && ISALIVE(vs->s_svr)) {
log_message(LOG_INFO, "%s sorry server %s from VS %s"
, (vs->s_svr->inhibit ? "Disabling" : "Removing")
, FMT_RS(vs->s_svr)
, FMT_VS(vs));
ipvs_cmd(LVS_CMD_DEL_DEST, vs, vs->s_svr);
vs->s_svr->alive = 0;
/* Adding back alive real servers */
perform_quorum_state(vs, 1);
}
if (vs->quorum_up) {
log_message(LOG_INFO, "Executing [%s] for VS %s"
, vs->quorum_up
, FMT_VS(vs));
notify_exec(vs->quorum_up);
}
#ifdef _WITH_SNMP_CHECKER_
check_snmp_quorum_trap(vs);
#endif
return;
}
/* If we have just lost quorum for the VS, we need to consider
* VS notify_down and sorry_server cases
*/
if (vs->quorum_state == UP &&
(!weight_sum || weight_sum < down_threshold)
) {
vs->quorum_state = DOWN;
log_message(LOG_INFO, "Lost quorum %lu-%lu=%li > %li for VS %s"
, vs->quorum
, vs->hysteresis
, down_threshold
, weight_sum
, FMT_VS(vs));
if (vs->quorum_down) {
log_message(LOG_INFO, "Executing [%s] for VS %s"
, vs->quorum_down
, FMT_VS(vs));
notify_exec(vs->quorum_down);
}
if (vs->s_svr) {
log_message(LOG_INFO, "%s sorry server %s to VS %s"
, (vs->s_svr->inhibit ? "Enabling" : "Adding")
, FMT_RS(vs->s_svr)
, FMT_VS(vs));
/* the sorry server is now up in the pool, we flag it alive */
ipvs_cmd(LVS_CMD_ADD_DEST, vs, vs->s_svr);
vs->s_svr->alive = 1;
/* Remove remaining alive real servers */
perform_quorum_state(vs, 0);
}
#ifdef _WITH_SNMP_CHECKER_
check_snmp_quorum_trap(vs);
#endif
return;
}
}
