Nagios 监控软件
下载安装Nagios及Nagios插件过程如下：
——下载Nagios
——下载Nagios插件
——解压Nagios
#tar -zvxf nagios-3.2.1.tar.gz
#cd nagios-3.2.1
——编译
#./configure --with-command-group=nagcmd #make all
——安装Nagios，初始化脚本及配置文件，Nagios将会被安装至/usr/local/nagios #make install #make install-init #make install-config #make install-commandmode
——安装WEB界面，界面将会安装到 /usr/local/nagios/share ( http 配置文件默认添加到 /etc/httpd/conf.d/nagios.conf，如果没有则执行：
#cp sample-config/httpd.conf /etc/apache2/conf.d/nagios.conf )
#make install-webconf
——创建HTTP认证用户登录Nagios，用户名nagiosadmin，密码123456
#htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
——重启apache
#service httpd restart
——安装Nagios插件
#tar -zvxf nagios-plugins-1.4.14.tar.gz
#cd nagios-plugins-1.4.14
#./configure --with-nagios-user=nagios --with-nagios-group=nagios #make && make install
——配置Nagios管理员接受告警信息的邮箱，写入管理员邮箱 #vim /usr/local/nagios/etc/objects/contacts.cfg email admin@admin.com ; ——校验Nagios配置文件，验证配置是否有误 #/usr/local/nagios/bin/nagios -v
——启动Nagios，配置在系统启动时运行Nagios
#chkconfig --add nagios
#chkconfig nagios on
#chkconfig httpd on
——运行Nagion
#service nagios start
四、登陆到Web界面
输入用户名密码:nagiosadmin 123456，http://localhost/nagios/
五、相关的插件查看页面：http://exchange.nagios.org/index.php?option=com_mtree&task
=search&Itemid=74&searchword=postfix
#!/bin/bash
#
#check_postque -w 10 -c 30 -W 1000000 -C 3000000 -p postfix"
#
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3
exitstatus=3
#接受10个参数
if [ "$#" == "10" ]; then
arg=${10}
w=$2
c=$4
W=$6
C=$8
mail_empty="Mail queue is empty"
mails=`postqueue -c /etc/$arg -p`
#if []; then
if [ "$mails" == "$mail_empty" ]; then
exitstatus=$STATE_OK
echo "OK : $mail_empty"
else
crt=`postqueue -c /etc/$arg -p | grep Kbytes | sed -e 's/^.*--.//g' | awk '{print $1}'`
msg=`postqueue -c /etc/$arg -p | grep Kbytes | sed -e 's/^.*--.//g' | awk '{print $4}'`
if [ $msg -gt $c -o$crt -gt $C ]; then
exitstatus=$STATE_CRITICAL
echo "Critical : Queue has ${msg} messages in ${crt} Kbytes, higher then critical limit."
elif [ $msg -gt $w-o $crt -gt $W ] ; then
exitstatus=$STATE_WARNING
echo "Warning : Queue has $msg messages in $crt Kbytes, higher then warning limit."
else
exitstatus=$STATE_OK
echo "OK : Mail queue has $msg messages in $crt Kbytes."
fi
fi
#else
# exitstatus=$STATE_CRITICAL
# echo "CRITICAL : Mail system is down <!_!> "
#fi
else
echo " "
echo "Please provide parameters to work with."
echo "Help : ./check_postque -w 10 -c 30 -W 1000000 -C 3000000 -p postfix"
echo "Where :"
echo " -w = Request Warning limit"
echo " -c = Request Critical limit"
echo " -W = Message size Warning limit"
echo " -C = Message size Critical limit"
echo " -p = Postfix instance name"
echo " "
fi
exit $exitstatus
接着修改邮件服务器的nrpe.cfg文件，增加如下command监控：
command=/App/nagios/libexec/check_postque -w 50-c 100 -W 3000000
-C 5000000 -p postfix
#队列数大于50告警，100严重告警。邮件大小总计300M告警，邮件大小总计500M严重告警
注：我的nagios的程序是安装在/App/nagios目录的，如果你安装的其他目录，上面的command中的路径也需要做相应的修改.
define command{
command_name check_smtp
command_line /usr/local/nagios/libexec/check_postque -w 50-c 100 -W 3000000 -C 5000000 -p postfix
#command_line $USER1$/check_smtp -H $HOSTADDRESS$ $ARG1$
}
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