关闭selinux
注意：（如没有，可跳过） 修改selinux配置： getenforce setenforce 0如果要使用selinux，需要修改如下
chcon -R -t https_sys_content_t /usr/local/nagios/sbin chcon -R -t https_sys_content_t /usr/local/nagios/share1、安装必备软件：
yum -y install httpd php gcc glibc glibc-common gd gd-devel openssl-devel xinetd2、下载相关程序：
wget wget wget创建Nagios用户及组：
/usr/sbin/useradd nagios -s /bin/bash创建一个名为nagcmd的用户组，用于从web接口执行外部命令。将Nagios用户和Apache用户加入组中：
/usr/sbin/groupadd nagcmd /usr/sbin/usermod -G nagcmd nagios /usr/sbin/usermod -G nagcmd apache注：上面的apache是Apache用户所属的组，如有不同请自行调整。
编译安装nagios：
tar zxf nagios-3.2.3.tar.gz cd nagios-3.2.3 ./configure --with-command-group=nagcmd make all make install make install-init make install-config make install-commandmode make install-webconf注：make install 用于安装主要的程序、CGI及HTML文件
make install-init 用于生成init启动脚本 make install-config 用于安装示例配置文件 make install-commandmode 用于设置相应的目录权限 make install-webconf 用于安装Apache配置文件配置Nagios Web界面登陆帐号及密码：
htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin安装nagios插件：
tar xzf nagios-plugins-1.4.15.tar.gz cd nagios-plugins-1.4.15 ./configure --with-nagios-user=nagios --with-nagios-group=nagios make && make install启动前先检查下配置文件是否正确:
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg启动nagios服务：
/usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg查看Nagios运行状态：
/usr/local/nagios/bin/nagiostats加入nagios到启动组：
chkconfig --add nagios chkconfig nagios on注意：如果运行/etc/init.d/nagios restart 出现Starting nagios:This account is currently not available.
执行： usermod -s /bin/bash nagios 给用户指定默认shell。登陆nagios：
重启apache服务： /etc/init.d/httpd restart安装NRPE：
注意：由于NRPE是通过SSL方式在监控和被监控主机上进行数据传输的，所以必须先安装ssl相关的软件包。tar zxf nrpe-2.12.tar.gz
cd nrpe-2.12 ./configure make all make install-plugin make install-daemon make install-daemon-config make install-xinetd编辑：
vi /etc/xinetd.d/nrpe only_from = 127.0.0.1 #修改成nagios服务器的地址添加nrpe后台服务端口到/etc/services文件中：
vi /etc/services nrpe 5666/tcp #NRPE重启xinetd服务：
service xinetd restart注意：
如果开启了防火墙，打开防火墙规则： iptables -I RH-Firewall-1-INPUT -p tcp -m tcp --dport 5666 -j ACCEPT 保存新规则： service iptabls save验证NRPE是否正确安装：
/usr/local/nagios/libexec/check_nrpe -H localhost 注：如果成功，会返回NRPE的版本号。监控主机上的操作：
安装nagios插件和nrpe，步骤同上。nagios服务器添加nrpe命令模板：
vi /usr/local/nagios/etc/objects/commands.cfg define command{ command_name check_nrpe command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$ -t 60 }新建存放主机文件的目录：
vi /usr/local/nagios/etc/nagios.cfg cfg_dir=/usr/local/nagios/etc/serversmkdir /usr/local/nagios/etc/servers
chown -R nagios.nagios /usr/local/nagios/etc/servers在模板里添加一个host主机模板包含pnp：
vi /usr/local/nagios/etc/objects/templates.cfg define host{ name linux-server ; The name of this host template use generic-host,hosts-pnp ; This template inherits other values from the generic-host template check_period 24x7 ; By default, Linux hosts are checked round the clock check_interval 5 ; Actively check the host every 5 minutes retry_interval 1 ; Schedule host check retries at 1 minute intervals max_check_attempts 10 ; Check each Linux host 10 times (max) check_command check-host-alive ; Default command to check Linux hosts notification_period workhours ; Linux admins hate to be woken up, so we only notify during the day ; Note that the notification_period variable is being overridden from ; the value that is inherited from the generic-host template! notification_interval 120 ; Resend notifications every 2 hours notification_options d,u,r ; Only send notifications for specific host states contact_groups admins ; Notifications get sent to the admins by default register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL HOST, JUST A TEMPLATE! }在模板里添加一个pnp服务模板：
vi /usr/local/nagios/etc/objects/templates.cfg define service{ name pnp-service ; The name of this service template use generic-service,services-pnp ; Inherit default values from the generic-service definition max_check_attempts 4 ; Re-check the service up to 4 times in order to determine its final (hard) state normal_check_interval 5 ; Check the service every 5 minutes under normal conditions retry_check_interval 1 ; Re-check the service every minute until a hard state can be determined register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL SERVICE, JUST A TEMPLATE! } 创建一个主机配置文件： vi /usr/local/nagios/etc/servers/192.168.56.151.cfg修改联系人信息：
vi /usr/local/nagios/etc/objects/contacts.cfg define contact{ contact_name backkom ; Short name of user use generic-contact ; Inherit default values from generic-contact template (defined above) alias system Admin ; Full name of user email ;<<***** CHANGE THIS TO YOUR EMAIL ADDRESS ****** }把用户加入admin组：
define contactgroup{ contactgroup_name admins alias Nagios Administrators members nagiosadmin,backkom } 创建主机组： vi /usr/local/nagios/etc/objects/groups.cfg cfg_file=/usr/local/nagios/etc/objects/groups.cfg define hostgroup{ hostgroup_name server; The name of the hostgroup alias App server; Long name of the group members server1,server2,app1,app2,db1,db2 }