nagios警示延遲的解決--flapping state

標籤：

這個問題是在測試中發現的。因為要在伺服器上布置nagios用來監控oracle，可是發現手動shutdown資料庫後能夠很快警示，但是再startup後就不是很及時，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。


注意看那個類似雲朵的表徵圖，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。

警示延遲是由於host or service狀態不穩定，nagios稱之為flapping state
在nagios的主設定檔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#雖然文檔裡說預設是0，但實際為1.改為0之後就解決了flapping state，並且解決了臨時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

nagios警示延遲的解決--flapping state