nagios安装及配置
nagios 详细的安装及配置！ http://guojiping.blog.运维网.com/5635432/1293933
一、安装前的准备
1.下载到核心源码：
wget http://sourceforge.net/projects/nagios/files/nagios-3.x/nagios-3.4.3/nagios-3.4.3.tar.gz/download
2.下载插件包nagios-plugins-1.4.16.tar.gz：
http://download.chinaunix.net/download.php?id=26943&ResourceID=7184
3. nagios服务器端软件和客户端软件
# wget http://nchc.dl.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.13/nrpe-2.13.tar.gz
4.源码安装前需要先确定 已经安装 apache，gcc，GD库和开发库
yum install -y httpd php gcc glibc glibc-common gd gd-devel perl make
二、监控端：
第1个步骤：
# useradd -s /sbin/nologin nagios
# mkdir /usr/local/nagios
# chown -R nagios.nagios /usr/local/nagios#提高安全性
创建一个名为nagios的帐号并给定登录口令
# useradd nagios
passwd nagios#密码123456
创建一个用户组名为nagcmd用于从Web接口执行外部命令
/usr/sbin/groupadd nagcmd
/usr/sbin/usermod -G nagcmd nagios
/usr/sbin/usermod -G nagcmd apache
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# yum install sendmail –y
#cd nagios
运行Nagios配置脚本并使用先前开设的用户及用户组：
./configure --with-command-group=nagcmd
下面这个，我这里没指定
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make all
make install
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make install-init
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make install-config
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make install-commandmode
把Nagios加入到服务列表中以使之在系统启动时自动启动
http://img1.运维网.com/attachment/201309/10/5635432_1378818217vwSW.jpg
现在还不能启动Nagios－还有一些要做的...
客户后配置
样例配置文件默认安装在这个目录下/usr/local/nagios/etc，这些样例文件可以配置Nagios使之正常运行，只需要做一个简单的修改...
用你擅长的编辑器软件来编辑这个/usr/local/nagios/etc/objects/contacts.cfg配置文件，更改email地址nagiosadmin的联系人定义信息中的EMail信息为你的EMail信息以接收报警内容。
vi /usr/local/nagios/etc/objects/contacts.cfg
配置WEB接口
安装Nagios的WEB配置文件到Apache的conf.d目录下
nagios-3.4.3.tar.gz解压后的nagios中执行
# cd nagios
# make install-webconf
在ls /etc/httpd/conf.d/下，会出现nagios.conf 文件
第2个步骤：ngios插件
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下面使用的版本与上面不同：
展开Nagios插件的源程序包
cd /root
tar xzf nagios-plugins-1.4.16.tar.gz
cd nagios-plugins-1.4.16
yum install -y openssl openssl-devel
编译并安装插件
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make && make install
第3个步骤：安装nagios汉化插件（此步，我跳过了）
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第4个步骤：
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我在这里采用的yum安装！
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以上，是参考文档，我这里如下配置：
因为前面建立了个用户组，把nagios和apache都添加进去了！因此，我这里无需改动：除了这个无需改动http://img1.运维网.com/attachment/201309/10/5635432_1378818564j0SR.jpg，其他修改如上
http://img1.运维网.com/attachment/201309/10/5635432_1378818572ver6.jpg
创建一个nagiosadmin的用户用于Nagios的WEB接口登录。记下你所设置的登录口令，一会儿你会用到它。
htpasswd -c /usr/local/nagios/etc/htpasswd nagiosadmin #密码123456
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重启Apache服务以使设置生效。
service httpd restart
如果出现服务启动不了,出现这样
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启动Nagios
验证Nagios的样例配置文件
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
如果没有报错，可以启动Nagios服务
service nagios start
# service nagios start
Starting nagios: done.
界面：
http://192.168.1.104:1080/nagios/
访问时，输入用户名和密码：则是vim /usr/local/nagios/etc/htpasswd 该文件中的用户和密码！
http://img1.运维网.com/attachment/201309/211524500.jpg
三、中间出现的问题及解决方法：
这时,监控端已配置好：
http://192.168.1.104:1080/nagios/
访问时,却发现,访问不到
http://img1.运维网.com/attachment/201309/10/5635432_1378818596oFxz.jpg
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Apache重启才能生效!
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如果无法访问，查看apache服务是否开启，如果启动不了，查原因，我这里是由于selinux没关闭，导致的，vim /etc/selinux/config 把#SELINUX=enforcing
SELINUX=disabled
如果apache正常，扔无法打开web，则查看iptables
如iptables –F 规则，清理下，ok
四、NEPR监控远程主机
在监控机上安装
cd /root
tar xvf nrpe-2.13.tar.gz
cd nrpe-2.13
./configure
make all && make install-plugin
在文件/usr/local/nagios/etc/objects/commands.cfg后面增加：
# 'check_nrpe' command definition
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$
}
定义主机：
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vim /usr/local/nagios/etc/nagios.cfg
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/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
监测看到如下: 这里有1个警告，是没问题的！
http://img1.运维网.com/attachment/201309/10/5635432_1378818619IQ9f.jpg
/etc/init.d/nagios restart
看到界面如下：
http://img1.运维网.com/attachment/201309/10/5635432_1378818625RvoA.jpg
定义相应的服务:
vim /usr/local/nagios/etc/objects/service.cfg (自己创建的)
# cat service.cfg
define service{
use generic-service;
host_name test;
service_description users;
check_command check_nrpe!check_users;
}
define service{
use generic-service;
host_name test;
service_description load;
check_command check_nrpe!check_load;
}
define service{
use generic-service;
host_name test;
service_description disk;
check_command check_nrpe!check_disk;
}
define service{
use generic-service;
host_name test;
service_description zombie;
check_command check_nrpe!check_zombie_procs;
}
define servicegroup{
servicegroup_name servergroup;
alias server-group;
members test,users,test,load,test,disk,test,zombie;
}(这个文档对应的是被监控端的vim/usr/local/nagios/etc/nrpe.cfg 中定义的命令，如command=/usr/local/nagios/libexec/check_users -w 10-c 16)
写完后，进行验证：
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
然后记着重启nagios
http://img1.运维网.com/attachment/201309/10/5635432_1378818626Dycw.jpg
出现上面：
在被监控端192.168.1.106：
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在监控端：
# /usr/local/nagios/libexec/check_nrpe -H 192.168.1.106 -c check_disk
DISK OK - free space: / 6666 MB (72% inode=95%);| /=2521MB;9188;9488;0;9688
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上面的HTTP错误，开放80端口，在httpd.conf中，增加Listen 80，然后，apache服务重启，解决！
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http://img1.运维网.com/attachment/201309/10/5635432_1378818641FMko.jpghttp://img1.运维网.com/attachment/201309/10/5635432_1378818644cMzg.jpg
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在被监控机上：
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http://img1.运维网.com/attachment/201309/10/5635432_1378818659jYcm.jpg
在这里,我的操作如下：
groupadd nagios
useradd -g nagios -d /usr/local/nagios -s /sbin/nologin nagios
cd /tmp/
tar xvf nagios-plugins-1.4.16.tar.gz
cd nagios-plugins-1.4.16
./configure --with-nagios-user=nagios --with-nagios-group=nagios --enable-redhat-pthread-workaround
make && make install
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cd /root
tar xvfz nrpe-2.13.tar.gz
cd nrpe-2.13
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
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具体操作如下：
更改/usr/local/nagios/etc/nrpe.cfg文件，在参数allowed_hosts后添加监控机ip（多个ip以逗号分隔，目前监控及ip为222.189.237.136,112.84.184.111）
http://img1.运维网.com/attachment/201309/10/5635432_13788186686ExZ.jpg
可以在/etc/services结尾增加：
echo 'nrpe 5666/tcp # NRPE' >> /etc/services
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/usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.13
http://img1.运维网.com/attachment/201309/10/5635432_1378818674rOvI.jpg
更改 /usr/local/nagios/etc/nrpe.cfg，把原来command都注释掉
nrpe.cfg文件里包含需要监控远程主机的命令，如：
echo '
command=/usr/local/nagios/libexec/check_users -w 10 -c 16
command=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command=/usr/local/nagios/libexec/check_disk -w 500 -c 200 -p /
command=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command=/usr/local/nagios/libexec/check_procs -w 40 -c 80 -m CPU
command=/usr/local/nagios/libexec/check_procs -w 150 -c 200 ' >> /usr/local/nagios/etc/nrpe.cfg
7）手工启动
手工启动方法 /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
8）添加开机启动
echo '/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d' >> /etc/rc.local
9）验证nrpe是否监听
netstat -tanp | grep nrpe
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