Nagios的安装与配置（3）
本帖最后由 monicazhang 于 2015-10-30 21:40 编辑20151030淡然续上
define host { use host-pnp host_name nagios-test1 alias nagios test1 address 172.26.188.202 contact_groups admins check_command check-host-alive max_check_attempts 5 notification_interval 10 notification_period 24x7 notification_options d,u,r }修改services.cfg services.cfg定义被监控机的监控项，配置如下：define service { use srv-pnp host_name nagios-test1 service_description check_tcp 80 check_period 24x7 max_check_attempts 4 normal_check_interval 3 retry_check_interval2 contact_groups admins notification_interval 10 notification_period 24x7 notification_options w,u,c,r event_handler_enabled 1 event_handler restart-httpd check_command check_tcp!80 nagios安装 }被监控机配置被监控机安装plugin #groupadd nagios#useradd -g nagios -d /usr/local/nagios nagios#tar –zxvf nagios-plugins-1.4.16.tar.gz#cd nagios-plugins-1.4.16#./configure --with-nagios-user=nagios --with-nagios-group=nagios# make # make install被监控机安装nrpe #tar -zxvf nrpe-2.13.tar.gz#cd nrpe-2.13#./configure --prefix=/usr/local/nagios#make all#make install-plugin#make install-daemon#make install-daemon-config#chown -R nagios:nagios /usr/local/nagios
将nrpe加入xinetd启动#vi /etc/xinetd.d/nrpeservice nrpe{ flags = REUSE socket_type = stream port = 5666 wait = no user = nagios group = nagios server = /usr/local/nagios/bin/nrpe server_args = -c /usr/local/nagios/etc/nrpe.cfg --inetd 开源监控软件 log_on_failure+= USERID disable = no only_from = 127.0.0.1 172.26.188.201}
在/etc/services对应位置加入如下行： nrpe 5666/tcp # NRPE
启动nrpeservice xinetd restart配置 被监控机主要修改了以下这几个文件/usr/local/nagios/etc/nrpe.cfg/etc/hosts.allow/etc/rc.local1) 配置 NRPE首先查看/usr/local/nagios/libexec文件夹下面是否有监控脚本命令，这些脚本既为nrpe.cfg中定义命令需要调用的脚本vi /usr/local/nagios/etc/nrpe.cfgallowed_hosts=172.26.188.201 #监控机IPserver_address=172.26.188.202 #本机IP在nrpe.cfg中添加自定义的命令以下条命令为例Command=/usr/local/nagios/libexec/check_disk–w 20% -c 10% -p /dev/sdb2监测硬盘使用量，check_sdb2为自定义名，check_disk为调用的脚本，-w是警告，剩余20%容量时，-c，10%为严重值，-p指定要监控的硬盘2) 修改/etc/hosts.allow增加监控机ipecho 'nrpe:监控机ip ' >> /etc/hosts.allow3) 启动 NRPE 守护进程：/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg–d4) 设置开机自动启动NRPE。echo "/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d" >> /etc/rc.local查看相应的端口：netstat -an |grep 5666你会发现5666端口已开启。
要点：在添加被监控机时，首先要确定被监控机nrpe.cfg文件里有添加此命令行，前提是在被监控机的/usr/local/nagios/libexec文件夹下面有相应的监控命令的脚本；其次在监控机的command.cfg文件配置里也要有相应的配置，既依照文件里面nrpe的定义文件来添加相应的监控命令；最后是监控机的services.cfg文件中定义具体的监控项。nagios事件自动处理nagios通过SSH执行event_hander nagios使用event handlers来在任何人收到通知之前由Nagios做一些前期故障修复。 nagios配置事件处理命令可以用shell或是perl脚本，脚本中应该处理以下宏：
对服务的：$SERVICESTATE$、$SERVICESTATETYPE$和$SERVICEATTEMPT$；
对主机的：$HOSTSTATE$、$HOSTSTATETYPE$和$HOSTATTEMPT$。
脚本须检测这些作为命令行参数传入的值，并采取必要动作来处理这些值。下面以nagios监控apache服务，当apache停止时自动启动apache。详细配置步骤如下:1) 配置在Nagios监控机上无密码登录远程被监控机Ø 生成ssh密钥文件#su - nagios$ ssh-keygen -t rsa# 下面一直回车，不要设置密码Generating public/private rsa key pair.Enter file in which to save the key (/home/nagios/.ssh/id_rsa):Enter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /home/nagios/.ssh/id_rsa.Your public key has been saved in /home/nagios/.ssh/id_rsa.pub.The key fingerprint is:d2:82:61:12:53:f9:53:75:77:8d:32:c0:ca:c8:20:60 nagios@nagios.itech.comØ 将生成的密钥拷贝到要远程被监控主机上$ scp .ssh/id_rsa.pub nagios-test1:/usr/local/nagios/Ø 在要远程登录的被监控机器上配置公钥$ ssh nagios@nagios-test1$ nagios@nagios-test1's password:$ cat id_rsa.pub >> .ssh/authorized_keys$ chmod 600 .ssh/authorized_keys 监控软件$ exitØ 测试无密码登录$ ssh nagios@nagios-test12) 在远程被监控机器上配置sudo使nagios用户可以以root身份运行/usr/local/nagios/libexec/eventhandlers/restart-httpd脚本# visudo添加如下行：nagios ALL=(root) NOPASSWD:/usr/local/nagios/libexec/eventhandlers/restart-httpd注释如下行：#Defaults requiretty3) 在远程机器上编写apache重启脚本
vi /usr/local/nagios/libexec/eventhandlers/restart-httpd内容如下:#!/bin/sh## Event handler script for restarting the Apache server on the remote machine## Note: This script will only restart the Apache server if the service is# retried 2 times (in a "soft" state) or if the web service somehow# manages to fall into a "hard" error state.### What state is the Apache service in? nagios实施case "$1" inOK);;WARNING);;UNKNOWN);;CRITICAL)# Is this a "soft" or a "hard" state?case "$2" inSOFT)# What check attempt are we on? We don't want to restart the Apache server on the first# check, because it may just be a fluke! nagios培训case "$3" in2)
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本帖关键字:Nagios
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