keepalived源碼解析 —— vrrp_state_leave_master()

/*
master 切換到 back
*/
void
vrrp_state_leave_master(vrrp_t * vrrp, bool advF)
{
#ifdef _WITH_LVS_
	if (VRRP_VIP_ISSET(vrrp)) {
		/* Check if sync daemon handling is needed */
		if (global_data->lvs_syncd.vrrp == vrrp)
			ipvs_syncd_backup(&global_data->lvs_syncd);
	}
#endif

	/* set the new vrrp state */
	if (vrrp->wantstate == VRRP_STATE_BACK) {
		log_message(LOG_INFO, "(%s) Entering BACKUP STATE", vrrp->iname);
		vrrp->preempt_time.tv_sec = 0;
// TODO - if we are called due to receiving a higher priority advert, do we overwrite master adver int ?
		vrrp->master_adver_int = vrrp->adver_int;
	}
	else if (vrrp->wantstate == VRRP_STATE_FAULT) {
		log_message(LOG_INFO, "(%s) Entering FAULT STATE", vrrp->iname);
		/* 本端 vrrp 故障 */
		vrrp_send_adv(vrrp, VRRP_PRIO_STOP);
	}
	else {
		log_message(LOG_INFO, "(%s) vrrp_state_leave_master called with invalid wantstate %d", vrrp->iname, vrrp->wantstate);
		return;
	}
	
	/* 刪除 virtual rules/router/ip */
	vrrp_restore_interface(vrrp, advF, false);
	vrrp->state = vrrp->wantstate;

	send_instance_notifies(vrrp);

	/* Set the down timer */
	vrrp->ms_down_timer = 3 * vrrp->master_adver_int + VRRP_TIMER_SKEW(vrrp);
	vrrp_init_instance_sands(vrrp);
	++vrrp->stats->release_master;
	vrrp->last_transition = timer_now();
}