Nagios 监控Linux服务器
搭建平台：centos5.5 + nagios-3.2.1 + nagios-plugins-1.4.15 + nrpe-2.12
有想时掌握公司服务器的运行状况，最担心那些重要的在线系统在我不知情的情况下停机或者停止网络服务，而且那些发生故障的服务或主机有时候可能要好长一段时间才知道。尤其是遇到节假日，运维工程师就很是紧张，以为服务器出器出现的事情太多了，因此就想办法来监控服务器，
所以监控软件发展迅速起来，之前有mon等，到目前最流行是开源的nagios，但是配置还是有些麻烦，
下面我就把我的实施过程写一下！呵呵！！
一：配置监控端
安装nagios;
1 -- 添加nagios用户 否则编译的时候出现问题
Useradd –m nagios
Passwd nagios 创建密码
Groupadd nagcmd 创建组
Usermod –a –G nagcmd nagios 添加到组
Usermod –a –G nagcmd daemon
2 -- 安装nagios-3.2.1
tar -xzvf nagios-3.2.1.tar.gz
./configure --prefix=/usr/local/nagios --with-command-group=nagcmd --with-gd-lib=/usr/lib --with-gd-inc=/usr/include （./configure --with-command-goup-nagcmd --with-gd-lib=/usr/local/lib --with-gd-inc=/usr/include/
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf
3 -- 安装nagio-plugin插件
cd nagios-plugins-1.4.15
./configure --with-nagios-user=nagios --with-nagios-group=nagios --enable-redhat-pthread-workaround
make
make install #（./configure --with-openssl --with-nagios-user=nagios --with-nagios-group=nagios ）
4 -- 安装nrpe插件
tar -zxvf nagios-nrpe_2.8.1.orig.tar.gz
cd nagios-nrpe_2.8.1
./configure (会自动加载SSL 但是最好还是手动安装)
（ ./configure --with-kerberos-inc=/usr/include/ --with-nrpe-user=nagios --with-nrpe-group=nagios --enable-ssl--with-ssl=/usr/lib #如果后面make报错,加如下参数
./configure --enable-ssl --with-ssl-lib=/usr/lib/(当然前提要有openssl)
make all
make install-plugin
make install-daemon
make install-daemon-config
5 -- 添加服务 作相关配置
chkconfig --add nagios
chkconfig nagios on
=== 验证配置
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
6 -- 配置Apache 添加web页面 如果自己编译就不需要了
Vi httpd.conf
# 在文件最后增加如下信息
ScriptAlias /nagios/cgi-bin /usr/local/nagios/sbin/
<Directory "/usr/local/nagios/sbin/">
AllowOverride AuthConfig
Options ExecCGI
Order allow,deny
Allow from all
</Directory>
Alias /nagios /usr/local/nagios/share/
<Directory "/usr/local/nagios/share">
Options None
AllowOverride AuthConfig
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
#AuthUserFile /usr/local/nagios/etc/.htpasswd
AuthUserFile /usr/local/nagios/etc/htpasswd.users
Require valid-user
</Directory>
7 -- 启动服务
service httpd restart
service nagios restart
8 -- 疑问
出现以下错误信息
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
解决方法：
setenforce 0 # 关掉SELinux服务