在管理机上安装rpm包
$ rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
$ yum -y install nagios nagios-plugins-all nagios-plugins-nrpe nrpe php httpd
$ chkconfig httpd on && chkconfig nagios on
$ service httpd start && service nagios start
设置管理界面密码
$ htpasswd -c /etc/nagios/passwd nagiosadmin
密码和用户名保持一致（都设置为nagiosadmin），否则你需要修改/etc/nagios/cgi.cfg
访问Nagios
打开http://ip/nagios，输入用户名和密码即可访问
在客户端上安装NRPE
$ rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
$ rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
$ yum -y install nagios nagios-plugins-all nrpe
$ chkconfig nrpe on
修改配置/etc/nagios/nrpe.cfg，例如：
log_facility=daemon
pid_file=/var/run/nrpe/nrpe.pid
server_port=5666
nrpe_user=nrpe
nrpe_group=nrpe
allowed_hosts=198.211.117.251
dont_blame_nrpe=1
debug=0
command_timeout=60
connection_timeout=300
include_dir=/etc/nrpe.d/
command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_disk]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/vda
command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200
command[check_procs]=/usr/lib64/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$
请注意修改allowed_hosts值为你的nagios监控机ip
设置iptables：
$ iptables -N NRPE
$ iptables -I INPUT -s 0/0 -p tcp --dport 5666 -j NRPE
$ iptables -I NRPE -s 198.211.117.251 -j ACCEPT
$ iptables -A NRPE -s 0/0 -j DROP
$ /etc/init.d/iptables save
或者，关闭iptables：
$ /etc/init.d/iptables stop
启动NRPE：
$ service nrpe start
在管理机上添加配置文件
$ echo "cfg_dir=/etc/nagios/servers" >> /etc/nagios/nagios.cfg
$ cd /etc/nagios/servers
$ touch hadoop.tk.cfg
$ touch hbase.tk.cfg
然后修改每一个配置文件：
$ vim /etc/nagios/servers/hadoop.tk.cfg
添加内容如下，你也可以稍作修改：
define host {
use linux-server
host_name cloudmail.tk
alias cloudmail.tk
address 192.168.56.122
}
define service {
use generic-service
host_name cloudmail.tk
service_description PING
check_command check_ping!100.0,20%!500.0,60%
}
define service {
use generic-service
host_name cloudmail.tk
service_description SSH
check_command check_ssh
notifications_enabled 0
}
define service {
use generic-service
host_name cloudmail.tk
service_description Current Load
check_command check_local_load!5.0,4.0,3.0!10.0,6.0,4.0
}
重启nagios：
$ chown -R nagios. /etc/nagios
$ service nagios restart
其他资源
nagios客户端：
- nagioschecker Firefox extension made as the statusbar indicator of the events from the network monitoring system Nagios.
- nagstamon Nagios status monitor Nagstamon is a Nagios status monitor which resides in systray or desktop (GNOME, KDE, Windows) as floating statusbar to inform you in realtime about the status of your hosts and services.
- Nagios Monitor for Android NagMonDroid retrieves the current problems from your Nagios install and displays them. It has a variable update frequency and can be set to vibrate on new update.
