這個問題是在測試中發現的。因為要在服務器上布置nagios用來監控oracle，可是發現手動shutdown數據庫后能夠很快報警，但是再startup后就不是很及時，有時會延遲很久。經過研究發現了這個情況，現貼出來與大家分享。


注意看那個類似云朵的圖標，那個就是在提示狀態抖動，也就是flapping state檢測開啟了。而一旦開啟，就會temporarily suppres notifications。

報警延遲是由于host or service狀態不穩定，nagios稱之為flapping state
在nagios的主配置文件nagios.cfg中，有如下內容：
# FLAP DETECTION OPTION
# This option determines whether or not Nagios will try
# and detect hosts and services that are "flapping". ?
# Flapping occurs when a host or service changes between
# states too frequently. ?When Nagios detects that a?
# host or service is flapping, it will temporarily suppress
# notifications for that host/service until it stops
# flapping. ?Flap detection is very experimental, so read
# the HTML documentation before enabling this feature!
# Values: 1 = enable flap detection
# ? ? ? ? 0 = disable flap detection?(default)


enable_flap_detection=0#雖然文檔里說默認是0，但實際為1.改為0之后就解決了flapping state，并且解決了臨時suppress notifications的問題






# FLAP DETECTION THRESHOLDS FOR HOSTS AND SERVICES
# Read the HTML documentation on flap detection for
# an explanation of what this option does. ?This option
# has no effect if flap detection is disabled.


low_service_flap_threshold=5.0
high_service_flap_threshold=20.0
low_host_flap_threshold=5.0
high_host_flap_threshold=20.0

轉載于:https://www.cnblogs.com/Yongzhouunknown/p/4898441.html

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