接到zz的任務(wù)，實(shí)現(xiàn)自動(dòng)化處理nagios某項(xiàng)報(bào)警

腦海里有個(gè)印象，這個(gè)功能之前線下做過(guò)實(shí)驗(yàn)

一、首先必須查看下nagios的官方文檔，確認(rèn)可行，以下是筆者整理的一些自認(rèn)為有用的信息

1）
了解命令的定義方法
Writing Event Handler Commands
Event handler commands will likely be shell or perl scripts, but they can be any type of executable that can run from a
command prompt. At a minimum, the scripts should take the following macros as arguments:
For Services: $SERVICESTATE$, $SERVICESTATETYPE$, $SERVICEATTEMPT$
For Hosts: $HOSTSTATE$, $HOSTSTATETYPE$, $HOSTATTEMPT$
這段說(shuō)的是，針對(duì)于主機(jī)處理需要的一些參數(shù)，跟針對(duì)于服務(wù)需要的一些參數(shù)，這方面配置是在objects/commands.cfg配置的
官方文檔記錄
define command{
command_name restart-httpd
command_line /usr/local/nagios/libexec/eventhandlers/restart-httpd $SERVICESTATE$ $SERVICESTATETYPE$ $SERVICEATTEMPT$
}

2）
了解主機(jī)配置文件的方法（筆者線上host和service合并的一個(gè)文件，一般是分開(kāi)的，主host跟service是分開(kāi)的）
官方文檔記錄：
define service{
host_name somehost
service_description HTTP
max_check_attempts 4
event_handler restart-httpd
...
}


二、一些解釋?zhuān)?br />
1）
變量解釋?zhuān)?br />$SERVICESTATE$：服務(wù)的當(dāng)前狀態(tài)（OK、WARNING、UNKNOWN、CRITICAL）
$SERVICESTATETYPE$：服務(wù)器狀態(tài)類(lèi)型，分為兩種，軟狀態(tài)，硬狀態(tài)
$SERVICEATTEMPT$:軟狀態(tài)的嘗試check的次數(shù)
這些值是后面自動(dòng)恢復(fù)腳本必須要處理的三個(gè)參數(shù)

2）
HARD:硬狀態(tài)
SOFT:軟狀態(tài)
nagios在檢測(cè)服務(wù)正常的過(guò)程中，如果第一次檢測(cè)失敗，狀態(tài)成SOFT 嘗試設(shè)置的最大次數(shù)后，狀態(tài)就改變成為HARD

3)
事件處理的一些參數(shù)配置
event_handler_timeout=30  超時(shí)時(shí)間
enable_event_handlers=1   開(kāi)機(jī)事件處理機(jī)制
event_handler


三、操作步驟：
1）
確認(rèn)事件處理開(kāi)關(guān)有沒(méi)有打開(kāi)
enable_event_handlers=1
0：關(guān)閉
1：打開(kāi)

2)
自恢復(fù)腳本制作
需要處理的參數(shù)太多，建議使用case,下面是官網(wǎng)的腳本例子，當(dāng)然可以寫(xiě)成其他的
#!/bin/sh
#
# Event handler script for restarting the web server on the local machine
#
# Note: This script will only restart the web server if the service is
# retried 3 times (in a "soft" state) or if the web service somehow
# manages to fall into a "hard" error state.
#
# What state is the HTTP service in?
case "$1" in
OK)
# The service just came back up, so don't do anything...
;;
WARNING)
# We don't really care about warning states, since the service is probably still running...
;;
UNKNOWN)
# We don't know what might be causing an unknown error, so don't do anything...
;;
CRITICAL)
# Aha! The HTTP service appears to have a problem - perhaps we should restart the server...
# Is this a "soft" or a "hard" state?
case "$2" in
# We're in a "soft" state, meaning that Nagios is in the middle of retrying the
# check before it turns into a "hard" state and contacts get notified...
SOFT)
# What check attempt are we on? We don't want to restart the web server on the first
# check, because it may just be a fluke!
case "$3" in
# Wait until the check has been tried 3 times before restarting the web server.
# If the check fails on the 4th time (after we restart the web server), the state
# type will turn to "hard" and contacts will be notified of the problem.
# Hopefully this will restart the web server successfully, so the 4th check will
# result in a "soft" recovery. If that happens no one gets notified because we
# fixed the problem!
3)
echo -n "Restarting HTTP service (3rd soft critical state)..."
# Call the init script to restart the HTTPD server
/etc/rc.d/init.d/httpd restart
;;
esac
;;
#

3）報(bào)警產(chǎn)生之后，如何當(dāng)nagios服務(wù)器得到下面?zhèn)魃蟻?lái)的報(bào)警呢，做出自維護(hù)呢（objects/commands.cfg）
在objects/commands.cfg該文件中表明當(dāng)報(bào)警產(chǎn)生，如何去執(zhí)行遠(yuǎn)端的腳本，


4）
在主機(jī)服務(wù)的配置文件中，啟用時(shí)間處理機(jī)制
event_handler  shell_name


/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
檢測(cè)上面修改的文件，有沒(méi)有報(bào)錯(cuò)

殺掉個(gè)服務(wù)，做下簡(jiǎn)單的測(cè)試，ok

不辜負(fù)zz的信任，解決了

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