Cacti+Nagios监控系统（三）：安装Nagios

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一、添加用户
  groupadd nagcmd
  useradd -G nagcmd nagios
  passwd nagios
    123456
  usermod -a -G nagcmd apache
二、安装nagios
  cd /root/download
  wget http://jaist.dl.sourceforge.net/project/nagios/nagios-4.x/nagios-4.0.7/nagios-4.0.7.tar.gz
  也可以从这里下载：http://www.nagios.org/download/
  tar xzvf nagios-4.0.7.tar.gz
  cd nagios-4.0.7
  ./configure --with-command-group=nagcmd  --enable-event-broker
  make all
  make install
  make install-init
  make install-config
  make install-commandmode
  make install-webconf
  设置登陆web界面时HTTP验证的账号密码
  htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
  service httpd restart
三、安装nagios-plugins
  cd /root/download
  wget http://nagios-plugins.org/download/nagios-plugins-2.0.2.tar.gz
  tar xzvf nagios-plugins-2.0.2.tar.gz
  cd nagios-plugins-2.0.2
  ./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-mysql
  make
  make install
  所有插件命令将被安装到/usr/local/nagios/libexec 目录下
四、其他设置
  1、检测nagios的配置
  /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
  2、添加自动动项
  chkconfig --add nagios
  chkconfig nagios on
  service nagios start
  3、登陆页面
  http://localhost/nagios
  账号nagiosadmin密码123456
五、遇到的问题
  点击页面左侧的MAP和History报错：
  The requested URL /nagios/sbin/statusmap.cgi was not found on this server.
  The requested URL /nagios/sbin/histogram.cgi was not found on this server.
  原因一：因为gd-devel php-gd没有安装的问题，造成NAGIOS在编译时不生成这statusmap.cgi  
  原因二：NAGIOS在编译在前， gd-devel安装在后，造成不生成这statusmap.cgi