nagios安装过程

nagios是目前非常流行的系统，服务器监控免费软件，很多大的国内站点像搜狐，网易都在使用nagios进行服务器监控。

nagios的有点在于他本身只是一个框架，对于nagios扩展监控模块，以及报警模块非常方便，能很方便的加入自己编写的服务监控，以及手机短信，邮件，gtalk ,msn报警等等。

以下是nagios在linux REDHAT AS4U4 下的安装和简单的配置过程：

下载软件：

wget http://surfnet.dl.sourceforge.net/sourceforge/nagios/nagios-3.0.3.tar.gz
wget http://nchc.dl.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.12.tar.gz
wget http://nchc.dl.sourceforge.net/sourceforge/nagiosplug/nagiosmib-1.0.0.tar.gz

添加用户：


useradd -m nagios
passwd nagios
groupadd nagcmd
usermod -G nagcmd nagios
usermod -G nagcmd daemon


编译安装nagios

tar -xvzf nagios-3.0.3.tar.gz
cd nagios-3.0.3
./configure --with-command-group=nagcmd
make all
make install
make install-init
make install-config
make install-commandmode

设置apache服务器访问密码：

cd /usr/local/nagios/etc/
/usr/local/apache/bin/htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

cd /usr/local/apache/conf/
vi httpd-vhosts.conf

配置apache的cgi ，具体配置如下：

ScriptAlias /nagios/cgi-bin /usr/local/nagios/sbin
<Directory "/usr/local/nagios/sbin">
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd.users
Require valid-user
</Directory>

Alias /nagios /usr/local/nagios/share
<Directory "/usr/local/nagios/share">
Options None
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd.users
Require valid-user
</Directory>

重启apache
/usr/local/apache/bin/apachectl configtest
/usr/local/apache/bin/apachectl stop
/usr/local/apache/bin/apachectl start

安装nagios插件

tar -xvzf nagios-plugins-1.4.12.tar.gz
cd nagios-plugins-1.4.12
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install
chkconfig --add nagios
chkconfig nagios on
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
service nagios start

现在你可以通过浏览器访问监控的界面了，http://www.example.com/nagios

现在你仅仅能看到对于本机的监控，接下来我们添加一个http服务的监控

cd /usr/local/nagios/
vi nagios.cfg

添加一行：

cfg_file=/usr/local/nagios/etc/objects/wwws.cfg

编写配置wwws.cfg
touch objects/hosts.cfg objects/wwws.cfg
vi objects/wwws.cfg

具体内容如下：

define host{                                         
        use             generic-host                 
        host_name               maycode              
        alias           www.maycode.com              
        address         10.11.24.42                  
        hostgroups              webhosts             
        max_check_attempts 10                        
}                                                    
                                                     
define hostgroup{                                    
        hostgroup_name  webhosts                     
        alias           web service hosts            
        members         maycode                      
}                                                    
                                                     
define service{                                      
        use             generic-service              
        host_name               maycode              
        service_description     HTTP                 
        check_command   check_http! -H www.maycode.com
}

请根据具体情况修改为你要监控的主机以及域名，现在来看看你的配置文件是否正确：


/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

如果争取，请重启nagios服务器
service nagios start

接下来请去浏览器看看吧，如果在host部分看到pending别奇怪啊，我们只设置了监控www服务器，如果你需要监控alive ，请参考localhost.cfg配置文件。

在libexec目录下，所有的监控脚本和应用都在，你可以用 prog -h ，查看如何使用这些监控脚本和程序。如果你自己写的程序最好也放在这个目录下。