关于在Nagios中如何配置网络服务监控。

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Nagios是一款开源的网络监控系统，它可以监控服务器、网络设备、应用程序等的运行状态，本文将介绍如何在Nagios中配置网络服务监控。

1、安装Nagios

首先需要在服务器上安装Nagios，以下是在不同操作系统上安装Nagios的方法：

在Ubuntu/Debian系统上安装Nagios：

sudo aptget update
sudo aptget install nagios3

在CentOS/RHEL系统上安装Nagios：

sudo yum install epelrelease
sudo yum install nagiosserver nagiospluginsstandard

2、配置Nagios

安装完成后，需要对Nagios进行基本配置，配置文件位于/etc/nagios3/nagios.cfg，以下是一些常用的配置项：

设置Nagios运行的用户和组
nagios_user=nagios
nagios_group=nagcmd
设置访问Nagios的用户名和密码
nagios_username=admin
nagios_password=your_password
设置邮件通知的参数
email_from=your_email@example.com
email_host=smtp.example.com
email_use_ssl=yes
email_auth_username=your_email@example.com
email_auth_password=your_email_password

3、添加主机和服务定义

在Nagios中，需要为要监控的主机和服务定义一个配置文件，配置文件位于/etc/nagios3/objects目录下，以下是一个简单的示例：

创建一个名为myhost.cfg的文件，用于定义主机：

define host {
    use                     generichost
    host_name               myhost
    alias                   My Host
    address                 192.168.1.100
    max_check_attempts      3
    check_period            24x7
    notification_interval   30m
    contact_groups          admins, nagiosadmins, networkadmins, webadmins, dbadmins, securityadmins, sysadmins, root, nagios, nagcmd, users, nagiosusers, unassigned, localusers, ptsusers, backupoperator, diskadmin, wheel, syncbackup, powerusers, postfixadmin, apacheadmin, webalizeradmin, mailmanadmin, dnsadmin, ftpadmin, newsadmin, ntpadmin, popadmin, proxyadmin, webminadmin, bindadmin, spamadmin, antivirusadmin, snmpadmin, netdumpadmin, securityadmin, oemadmin, ospdadmin, userdbadmin, ldapadmin, sasladmin, mysqldba, oracledba, postgresqldba, db2dba, ircops, jabberadmin, listadmin, webstatsadmin, logfiledba, nagioscoreboardadmin, nagvisadmin, nagiosgrapheradmin, nagiosndoadmin, napalmadmin, openviewadmin, netscreenadmin, qacontactgroup, pnp4nagiosadmin, rrdtooladmin, xinetdadmin, zabbixadmin, splunkadmin, tivoliadmin, netappdba, netappsupportteam, netapptechsupportteam, netappcomplianceteam, netappcomplianceteam2, netappcomplianceteam3, netappcomplianceteam4, netappcomplianceteam5, netappcomplianceteam6, netappcomplianceteam7, netappcomplianceteam8, netappcomplianceteam9, netappcomplianceteam10
}

创建一个名为myservice.cfg的文件，用于定义服务：

define service {
    use                     genericservice
    host_name               myhost
    service_description     Ping Test Service for myhost
    check_command           ping!192.168.1.100!50000!25000!50000!PING!50000!25000!50000!EXITVAL!100.0%!200.0%!500.0%!UNKNOWN!5000.0%!80%!10%!120%!240%!360%!480%!600%!720%!840%!960%!PING OK Packet loss = 1%, RTA = 5ms | PING FAILED Packet loss = 6%, RTA = 15ms | PING CRITICAL Packet loss = 15%, RTA = 35ms | PING UNKNOWN Packet loss = 25%, RTA = 55ms | PING DEGRADED Packet loss = 35%, RTA = 75ms | PING RETIRED Packet loss = 45%, RTA = 95ms | PING UNKNOWN Packet loss = 55%, RTA = 115ms | PING CRITICAL Packet loss = 65%, RTA = 135ms | PING FAILED Packet loss = 75%, RTA = 155ms | PING UNKNOWN Packet loss = 85%, RTA = 175ms | PING DEGRADED Packet loss = 95%, RTA = 195ms | PING RETIRED Packet loss = 105%, RTA = 215ms | PING UNKNOWN Packet loss = 115%, RTA = 235ms | PING CRITICAL Packet loss = 125%, RTA = 255ms | PING FAILED Packet loss = 135%, RTA = 275ms | PING UNKNOWN Packet loss = 145%, RTA = 295ms | PING DEGRADED Packet loss = 155%, RTA = 315ms | PING RETIRED Packet loss = 165%, RTA = 335ms | PING UNKNOWN Packet loss = 175%, RTA = 355ms | PING CRITICAL Packet loss = 185%, RTA = 375ms | PING FAILED Packet loss = 195%, RTA = 395ms | PING UNKNOWN Packet loss = 205%, RTA = 415ms | PING DEGRADED Packet loss = 215%, RTA = 435ms | PING RETIRED Packet loss = 225%, RTA = 455ms | PING UNKNOWN Packet loss =

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