安装apache+php 可以选择tar包或者直接rpm包，我这里偷懒用yum来安装apache+php。
yum install httpd* php* -y
将以下内容追加到httpd.conf文件的末尾：
Scriptalias /nagios/cgi-bin /usr/local/nagios/sbin
<directory "/usr/local/nagios/sbin">
Authtype basic
Options execcgi
Allowoverride none
Order allow,deny
Allow from all
Authname "nagios access"
Authuserfile /usr/local/nagios/etc/nagios.password
Require valid-user
</directory>
Alias /nagios /usr/local/nagios/share
<directory "/usr/local/nagios/share">
Authtype basic
Options none
Allowoverride none
Order allow,deny
Allow from all
Authname "nagios access"
Authuserfile /usr/local/nagios/etc/nagios.password
Require valid-user
</directory>
###############################################################################
创建nagios的管理用户和组
#useradd nagios -s /sbin/nologin
[nagios]#passswd nagios #################创建用户nagios
[nagios]#passwd nagios #################设置用户nagios密码
[nagios]#groupadd nagcmd #################创建nagcmd组
[nagios]#usermod -a -G nagcmd nagios #################将nagios添加到nagcmd组中
##############################################################################
安装nagios
[nagios]#tar xvzf nagios-3.2.1.tar.gz ###############解压nagios的压缩包
[nagios]#cd nagios-3.2.1 ##################进入解压的目录
[nagios]#./configure --prefix=/usr/local/nagios --with-command-group=nagcmd ###编译路径为/usr/loca/nagios 组为nagcmd
[nagios]#make all #############根据提示编译
[nagios]#make install
[nagios]#make install-init
[nagios]#make install-config #########安装的路径是/usr/local/nagios/etc
[nagios]#make install-commandmode ###########配置目录权限
安装Nagios-plugins
[nagios]#tar xvzf nagios-plugins-1.4.14.tar.gz ############解压plugins压缩包
[nagios]#./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios ####编译安装路径为/usr/local/nagios user为nagios group为nagios。
[nagios]# make && make install #################编译 安装
下面开始配置nagios
[nagios]# cd /usr/local/nagios/etc/ ######进入此目录
[nagios]# vim nagios.cfg
cfg_file=/usr/local/nagios/etc/objects/commands.cfg
cfg_file=/usr/local/nagios/etc/objects/contacts.cfg
cfg_file=/usr/local/nagios/etc/objects/timeperiods.cfg
cfg_file=/usr/local/nagios/etc/objects/templates.cfg
# Definitions for monitoring the local (Linux) host
#cfg_file=/usr/local/nagios/etc/objects/localhost.cfg ##########这个注释掉，如果要监控本机就不注释
cfg_file=/usr/local/nagios/etc/objects/hosts.cfg #######添加以下四行
cfg_file=/usr/local/nagios/etc/objects/hostgroups.cfg
cfg_file=/usr/local/nagios/etc/objects/contactgroups.cfg
cfg_file=/usr/local/nagios/etc/objects/services.cfg
[nagios]# vim cgi.cfg
authorized_for_system_information=nagiosadmin
authorized_for_configuration_information=nagiosadmin
authorized_for_system_commands=nagiosadmin
authorized_for_all_services=nagiosadmin
authorized_for_all_hosts=nagiosadmin
authorized_for_all_service_commands=nagiosadmin
authorized_for_all_host_commands=nagiosadmin
在这里默认的用户是“nagiosadmin”可以通过浏览器操纵nagios服务的关闭、重启等各种操作。 这里可以不用修改，后面创建用户的时候可以直接创建用户为nagiosadmin。
[nagios]#vim /usr/local/nagios/etc/object/hosts.cfg
define host {
host_name a.b.com ###########被监控IP 或 域名
alias tomas ###########这个是别名
address 1.1.1.1 ##########被监控的IP罗
contact_groups tomasgroup ##########这个在contactgroups.cfg添加的
check_command check-host-alive
check_period 24x7
max_check_attempts 5 ########### 失败后重试次数
notification_interval 10 ########每隔多久提醒一次，我觉得这是分钟意思
notification_period 24x7
notification_options d,u,r ###########什么情况下提醒 d = down 机
}
[nagios]#vim /usr/local/nagios/etc/objects/hostgroups.cfg
define hostgroup {
hostgroup_name tomas
alias tomas
members 1.1.1.1 多台被监控机用“，”隔开。
}
vim /usr/local/nagios/etc/objects/contacts.cfg
shit +g 在最后加入
define contact {
contact_name userA
alias system administrator
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r
host_notification_options d,u,r
service_notification_commands notify-service-by-email
host_notification_commands notify-host-by-email
email root@a.b.com
}
define contact {
contact_name userB
alias system administrator
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r
host_notification_options d,u,r
service_notification_commands notify-service-by-email
host_notification_commands notify-host-by-email
email alex@a.b.com
}
达到触发条件后就会发邮件给root与alex这2个ID userA和userB， 注意USERA.USERB为不同的邮箱。（小技巧在这可以设置139邮箱保定手机，实现短信的功能，当然也可以用飞信）
vim /usr/local/nagios/etc/objects/contactgroups.cfg
define contactgroup {
contactgroup_name tomasgroup #########定义个组名将USERA USERB 添加到这个组
alias system administrator group
members userA,userB
}
vim /usr/local/nagios/etc/objects/services.cfg
define service {
host_name 1.1.1.1
service_description PING
check_period 24x7
notification_interval 3
normal_check_interval 1
max_check_attempts 3
retry_check_interval 1
check_command check_ping!100.0,20%!500.0,60% ############## 通过ping监控
contact_groups tomasgroup
}
define service {
host_name 1.1.1.1
max_check_attempts 5
check_period 24x7
notification_interval 10
normal_check_interval 1
retry_check_interval 1
service_description HTTP
check_command check_http ##############监控Apache
notification_period 24x7
notification_options w,u,c,r
contact_groups tomasgroup
}
(小提示留心的朋友可能发现了check_command check_http 其实这些命令都在/usr/local/nagios/libexec/ 下可以都尝试下)
###########################################################################################
最后用下面的命令检查一下配置参数是否正确
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
如果出现：
Total Warnings: 0
Total Errors: 0
恭喜您配置正确.................
创建：
htpasswd -c /usr/local/nagios/etc/nagios.password nagiosadmin ##############创建nagiosadmin (创建这个账号的最大好处不用修改cgi.cfg文件，这也是好多文档中为什么要用这个用户）
检查是否成功创建：
tail /usr/local/nagios/etc/nagios.password 查看是否有nagiosadmin:*************
自此nagios配置完成
最后重启nagios Apache
service nagios restart
service httpd restart
