centos5安装nagios
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/share
1、安装必备软件：
yum -y install httpd php gcc glibc glibc-common gd gd-devel openssl-devel xinetd
2、下载相关程序：
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.3.tar.gz
wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.15.tar.gz
wget http://prdownloads.sourceforge.net/sourceforge/nagios/nrpe-2.12.tar.gz
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
http://localhost/nagios
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/servers
mkdir /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 backkom@mail.com ;
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