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nagios作用
1.
监控网络服务（SMTP、POP3、HTTP、NNTP、PING等）；
2.
监控主机资源（处理器负荷、磁盘利用率等）；
3.
简单地插件设计使得用户可以方便地扩展自己服务的检测方法；
4.
并行服务检查机制；
5.
具备定义网络分层结构的能力，用”parent”主机定义来表达网络主机间的关系，这种关系可被用来发现和明晰主机宕机或不可达状态；
6.
当服务或主机问题产生与解决时将告警发送给联系人（通过EMail、短信、用户定义方式）；
7.
具备定义事件句柄功能，它可以在主机或服务的事件发生时获取更多问题定位；
8.
自动的日志回滚；
9.
可以支持并实现对主机的冗余监控；
10.
可选的WEB界面用于查看当前的网络状态、通知和故障历史、日志文件等；
Nagios所需要的运行条件是机器必须可以运行Linux（或是Unix变种）并且有C语言编译器。你必须正确地配置TCP/IP协议栈以使大多数的服务检测可以通过网络得以进行。

安装

建立nagios账号
/usr/sbin/useradd nagios && passwd nagios

创建一个用户组名为nagcmd用于从Web接口执行外部命令。将nagios用户和apache用户都加到这个组中。

安装nagios及插件

正确安装完毕,/usr/local/nagios目录下将会有这几个文件夹
bin etc include libexec sbin share var

安装nagios‐plugins

在另一台机上编译安装apache，需要用到htpasswd这工具来生成登陆的用户名和密码
/usr/local/httpd/bin/htpasswd -c /usr/local/nagios/etc/viyin.net viyin

[root@game bin]# ./htpasswd -c /root/viyin.net viyin
New password:
Re-type new password:
Adding password for user viyin

验证配置文件
[root@vi bin]# pwd
/usr/local/nagios/bin
[root@vi bin]# ./nagios -v /usr/local/nagios/etc/nagios.cfg

Nagios Core 3.2.1
Copyright (c) 2009-2010 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 03-09-2010
License: GPL

Website: http://www.nagios.org
Reading configuration data…
Read main config file okay…
Processing object config file ‘/usr/local/nagios/etc/objects/commands.cfg’…
Processing object config file ‘/usr/local/nagios/etc/objects/contacts.cfg’…
Processing object config file ‘/usr/local/nagios/etc/objects/timeperiods.cfg’…
Processing object config file ‘/usr/local/nagios/etc/objects/templates.cfg’…
Processing object config file ‘/usr/local/nagios/etc/objects/localhost.cfg’…
Read object config files okay…

Running pre-flight check on configuration data…

Checking services…
Checked 8 services.
Checking hosts…
Checked 1 hosts.
Checking host groups…
Checked 1 host groups.
Checking service groups…
Checked 0 service groups.
Checking contacts…
Checked 1 contacts.
Checking contact groups…
Checked 1 contact groups.
Checking service escalations…
Checked 0 service escalations.
Checking service dependencies…
Checked 0 service dependencies.
Checking host escalations…
Checked 0 host escalations.
Checking host dependencies…
Checked 0 host dependencies.
Checking commands…
Checked 24 commands.
Checking time periods…
Checked 5 time periods.
Checking for circular paths between hosts…
Checking for circular host and service dependencies…
Checking global event handlers…
Checking obsessive compulsive processor commands…
Checking misc settings…

Total Warnings: 0
Total Errors: 0

Things look okay – No serious problems were detected during the pre-flight check
[root@vi bin]#

启动nagios服务
service nagios start

将nagios服务加入开机启动
chkconfig –add nagios
chkconfig nagios on

安装nrpe

同样，在被监控机上也要安装nrpe,nagios‐plugins
在监控与被监控机上启动NRPE：
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d

nagios安装完成

nginx cgi的配置

下载nginx-fcgi脚本
wget http://www.nginx.eu/nginx-fcgi/nginx-fcgi.txt

注释掉nginx-fcgi.txt 中的
if ( $> == “0″ ) {
print “\n\tERROR\tRunning as a root!\n”;
print “\tSuggested not to do so !!!\n\n”;
exit 1;
}
否则会提示：ERROR Running as a root! Suggested not to do so !!!

mv nginx-fcgi.txt /usr/local/nginx/sbin/nginx-fcgi

chmod +x /usr/local/nginx/sbin/nginx-fcgi

安装perl cgi模块
wget http://www.cpan.org/modules/by-module/FCGI/FCGI-0.67.tar.gz
tar -zxvf FCGI-0.67.tar.gz
cd FCGI-0.67
perl Makefile.PL
make && make install

安装FCGI-ProcManager:
wget http://search.cpan.org/CPAN/authors/id/G/GB/GBJK/FCGI-ProcManager-0.18.tar.gz
tar -xzxf FCGI-ProcManager-0.18.tar.gz
cd FCGI-ProcManager-0.18
perl Makefile.PL
make make install

继续安装
wget http://search.cpan.org/CPAN/authors/id/I/IN/INGY/IO-All-0.39.tar.gz

wget http://search.cpan.org/CPAN/authors/id/J/JV/JV/Getopt-Long-2.38.tar.gz

创建fastcgi_pass 接口
su www 切换到nginx运行用户
/usr/local/nginx/sbin/nginx-fcgi -l /home/wwwroot/nginx-fcgi.log -pid /tmp/nginx-fcgi.pid -S /tmp/nginx-fcgi.sock

无报错

nginx配置文件

server
{
listen 80;
server_name www.6fine.com www.viyin.net;
index index.html index.htm index.php default.html default.htm de
fault.php;
root /usr/local/nagios/share;

location ~ .*\.(php|php5)?$
{
fastcgi_pass unix:/tmp/php-cgi.sock;
#fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
}

location ~ .*\.cgi$ {
root /usr/local/nagios/sbin;
rewrite ^/nagios/cgi-bin/(.*)\.cgi /$1.cgi break;
fastcgi_pass unix:/tmp/nginx-fcgi.sock;
fastcgi_param SCRIPT_FILENAME /usr/local/nagios/sbin$fastcgi_script_na
me;
include fcgi.conf;
auth_basic “Nagios Access”;
auth_basic_user_file /usr/local/nagios/etc/viyin.net;
}
location /nagios {
alias /usr/local/nagios/share;
}
location / {
auth_basic “Nagios Access”;
auth_basic_user_file /usr/local/nagios/etc/viyin.net;
}

}

完成
参考：http://bbs.linuxtone.org/viewthread.php?tid=4441&highlight=Nagios