Redhat 5.2 配置nagios
Redhat 5.2 配置nagios[*]安装系统组件
[*] 安装apache、gcc
[*] 配置apache
[*]安装nagios组件
[*] 安装nagios
[*] 安装nagios-plugins
[*] 安装nrpe
[*]配置被监控机
[*]配置linux被监控机（客户端）
[*]配置交换机被监控机（客户端）
[*]配置windows被监控机（客户端）
[*]配置邮件监控
安装组件
Apache、gcc glibc glibc-common gd-devel、 openssl、openssl-devel（open安装未列出）
net-snmp-libs net-snmp-devel net-snmp net-snmp-utils
安装apache、gcc
（由于rpm的依赖关系太烦人，配置yum，舒服多了，具体请见yum安装）
# yum install httpd
……
Downloading Packages:
(1/4): apr-util-1.2.7-7.e 100% |=========================|76 kB 00:00
(2/4): apr-1.2.7-11.i386. 100% |=========================| 123 kB 00:00
(3/4): httpd-2.2.3-11.el5 100% |=========================| 1.1 MB 00:01
(4/4): postgresql-libs-8. 100% |=========================| 196 kB 00:00
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 37017186
Importing GPG key 0x37017186 "Red Hat, Inc. (release key) <security@redhat.com>" from http://10.155.2.75/Server/RPM-GPG-KEY-redhat-release
Is this ok : y
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing: apr #########################
Installing: postgresql-libs #########################
Installing: apr-util #########################
Installing: httpd #########################
……
# yum install gcc
……
Downloading Packages:
(1/5): libgomp-4.1.2-42.e 100% |=========================|82 kB 00:00
(2/5): glibc-headers-2.5- 100% |=========================| 610 kB 00:00
(3/5): glibc-devel-2.5-24 100% |=========================| 2.0 MB 00:02
(4/5): gcc-4.1.2-42.el5.i 100% |=========================| 5.2 MB 00:07
(5/5): kernel-headers-2.6 100% |=========================| 843 kB 00:01
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing: libgomp #########################
Installing: kernel-headers #########################
Installing: glibc-headers #########################
Installing: glibc-devel #########################
Installing: gcc #########################
Installed: gcc.i386 0:4.1.2-42.el5
Dependency Installed: glibc-devel.i386 0:2.5-24 glibc-headers.i386 0:2.5-24 kernel-headers.i386 0:2.6.18-92.el5 libgomp.i386 0:4.1.2-42.el5
Complete!
# yum install glibc glibc-common gd-devel
……
Running Transaction
Installing: zlib-devel ####################### [ 1/12]
Installing: freetype-devel ####################### [ 2/12]
Installing: fontconfig-devel ####################### [ 3/12]
Installing: libpng-devel ####################### [ 4/12]
Installing: libXau-devel ####################### [ 5/12]
Installing: libjpeg-devel ####################### [ 6/12]
Installing: xorg-x11-proto-devel ####################### [ 7/12]
Installing: libX11-devel ####################### [ 8/12]
Installing: libXpm-devel ####################### [ 9/12]
Installing: libXdmcp-devel #######################
Installing: mesa-libGL-devel #######################
Installing: gd-devel #######################
Installed: gd-devel.i386 0:2.0.33-9.4.el5_1.1
Dependency Installed: fontconfig-devel.i386 0:2.4.1-7.el5 freetype-devel.i386 0:2.2.1-19.el5 libX11-devel.i386 0:1.0.3-9.el5 libXau-devel.i386 0:1.0.1-3.1 libXdmcp-devel.i386 0:1.0.1-2.1 libXpm-devel.i386 0:3.5.5-3 libjpeg-devel.i386 0:6b-37 libpng-devel.i386 2:1.2.10-7.1.el5_0.1 mesa-libGL-devel.i386 0:6.5.1-7.5.el5 xorg-x11-proto-devel.i386 0:7.1-9.fc6 zlib-devel.i386 0:1.2.3-3
Complete!
配置apache
注把apache 加入到nagcmd组，以便在通过web Interface 操作nagios是有足够的权限；
# useradd nagios && passwd nagios //chinahr123$
Changing password for user nagios.
New UNIX password:
BAD PASSWORD: it is based on a dictionary word
Retype new UNIX password:
Sorry, passwords do not match.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
# groupadd nagcmd
# usermod -G nagcmd nagios
# usermod -G nagcmd apache
安装nagios组件
安装nagios
http://cdnetworks-kr-2.dl.sourceforge.net/project/nagios/nagios-3.x/nagios-3.2.1/nagios-3.2.1.tar.gz
http://cdnetworks-kr-2.dl.sourceforge.net/project/nagiosplug/nagiosplug/1.4.15/nagios-plugins-1.4.15.tar.gz
# tar zxvf nagios-3.2.1.tar.gz
# cd nagios-3.2.1
#./configure --with-command-group=nagcmd --prefix=/usr/local/nagios
# make all
# make install
# make install-init
/usr/bin/install -c -m 755 -d -o root -g root /etc/rc.d/init.d
/usr/bin/install -c -m 755 -o root -g root daemon-init /etc/rc.d/init.d/nagios
# make install-config
……
*** Config files installed ***
Remember, these are *SAMPLE* config files.You'll need to read
the documentation for more information on how to actually define
services, hosts, etc. to fit your particular needs.
# make install-commandmode
/usr/bin/install -c -m 775 -o nagios -g nagcmd -d /usr/local/nagios/var/rw
chmod g+s /usr/local/nagios/var/rw
*** External command directory configured ***
验证安装在/usr/local/nagios,是否生成目录binetcsbinsharevar.
# cd /usr/local/nagios
# ls
binetcsbinsharevar
安装nagios-plugins
# tar zxvf nagios-plugins-1.4.15.tar.gz
#./configure --with-nagios-user=nagios --with-nagios-group=nagios --prefix=/usr/local/nagios
# make && make install
验证是否安装成功，是否生成如下文件
# ls /usr/local/nagios/libexec
check_apt check_disk_smbcheck_ide_smart check_mrtg check_nwstatcheck_sensorscheck_users
check_breeze check_dns check_ifoperstatuscheck_mrtgtrafcheck_oraclecheck_smtp check_wave
check_by_ssh check_dummy check_ifstatus check_nagios check_overcrcheck_ssh negate
check_clamd check_file_agecheck_imap check_nntp check_ping check_swap urlize
check_clustercheck_flexlm check_ircd check_nt check_pop check_tcp utils.pm
check_dhcp check_ftp check_load check_ntp check_procs check_time utils.sh
check_dig check_http check_log check_ntp_peercheck_real check_udp
check_disk check_icmp check_mailq check_ntp_timecheck_rpc check_ups
配置nagios的WEB接口，也可以通过如下命令更改用户密码，
# /usr/bin/htpasswd -c /usr/local/nagios/etc/htpasswd nagiosadmin
New password:
Re-type new password:
Adding password for user nagiosadmin
# service httpd start
Starting httpd:
编辑httpd.conf，在结尾加上如下内容，保存，启动apache，service httpd restart
ScriptAlias /nagios/cgi-bin /usr/local/nagios/sbin
<Directory "/usr/local/nagios/sbin">
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
</Directory>
Alias /nagios /usr/local/nagios/share
<Directory "/usr/local/nagios/share">
Options None
AllowOverride None
Order allow,deny
Allow from all
AuthName "Nagios Access"
AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd
Require valid-user
</Directory>
设置开机启动nagios服务
# chkconfig --add nagios
# chkconfig nagios on
验证nagios配置是否正常，此命令以后会经常使用，warning和error为0，表示正常，后面不正常的讨论，这里可以启动nagios服务
# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
……
Checking misc settings...
Total Warnings: 0
Total Errors: 0
# service nagios start
Starting nagios: done.
安装nrpe
http://sourceforge.net/projects/nagios/files/nrpe-2.x/nrpe-2.8b1/nrpe-2.8b1.tar.gz/download
安装之前之前一定要安装gcc、 openssl、openssl-devel（尤其是linux被监控机，也是客户端）安装之后，是用/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg –d命令启动nrpe
tar -zxvf nrpe-2.8b1
cd nrpe-2.8b1
# ./configure
# make all
# make install-plugin
# make install-daemon
# make install-daemon-config
/usr/bin/install -c -m 775 -o nagios -g nagios -d /usr/local/nagios/etc
/usr/bin/install -c -m 644 -o nagios -g nagios sample-config/nrpe.cfg /usr/local/nagios/etc
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
通过如下命令验证nrpe是否正常，可以看到端口5666已经打开
# /usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.8b1
#
# netstat -atulnp | grep 'nrpe'
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 24823/nrpe
以上服务器端（也是就控制端）的nrpe（用于服务器的自身的监控）已经配置完成，接着服务器的nagios监控配置，配置如下nagios.cfg，去掉如下的“#”,每条记录都对应目录的相应的配置文件，下表中有说明，host.cfg和service.cfg是不存在的，可以自己建立，这些cfg文件都是可以自己建立的，只要在nagios.cfg添加相应的记录就行。现在我们只是做服务器自身的监控，只是用的commands.cfg、localhost.cfg，不用修改什么。
# vi /usr/local/nagios/etc/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
cfg_file=/usr/local/nagios/etc/objects/localhost.cfg
cfg_file=/usr/local/nagios/etc/objects/windows.cfg
cfg_file=/usr/local/nagios/etc/objects/switch.cfg
监控命令
command
nagios发出的哪个指令来执行某个监控,这也是自己定义的
联系人
contact
设置报警联系人，一般当然是系统管理员了
监控时间段
timeperiod
7X24小时不间断还是周一至周五,或是自定义的其他时间段
监控交换机
switch
例如主机是否存活,80端口是否开,磁盘使用情况或者自定义的服务等
被监控主机
localhost
监控机自己服务器
被监控主机
host
所需要监控的服务器,当然可以是监控机自己
被监控的服务
service
例如主机是否存活,80端口是否开,磁盘使用情况或者自定义的服务等
保存nagios.cfg后，用service httpd restart重启nagios服务，如果失败，用/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg验证，会提示出问题所在，关于问题解决在后面再将，这里只是服务器自身监控，应该不会有问题。
在IE下http://IP/nagios，输入nagiosadmin和密码(图1和图2)
配置被监控机
配置linux被监控机（客户端）
需要先安装gcc、openssl、openssl-devel。
先添加一个用户
# useradd nagios
# passwd nagios //123456
Changing password for user nagios.
New UNIX password:
BAD PASSWORD: it is too simplistic/systematic
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
安装nagios-plugins-1.4.15.tar.gz
# tar -zxvf nagios-plugins-1.4.15.tar.gz
# cd nagios-plugins-1.4.15
# ./configure --prefix=/usr/local/nagios
# make
# make install
# chown nagios.nagios /usr/local/nagios
# chown -R nagios.nagios /usr/local/nagios/libexec
安装nrpe
# tar -zxvf nrpe-2.8b1
# cd nrpe-2.8b1
# ./configure
# make all
# make install-plugin
# make install-daemon
# make install-daemon-config
编辑nrpe.cfg
#vi /usr/local/nagios/etc/nrpe.cfg
查找如下加上nagios服务器ip地址
allowed_hosts=127.0.0.1,10.155.2.65
保存后，用如下命令启动nrpe和添加到开机启动中
/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg –d
echo '/usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d &> /dev/null' >> /etc/rc.local
验证
# /usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.8b1
# netstat -atulnp | grep 'nrpe'
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN 24823/nrpe
如果不正常见文章最后的问题和解决（1）
这里客户端的配置已经完成，已经可以到nagios服务器配置command.cfg监控，但是这里介绍另一种方法在编辑nrpe.cfg配置命令，nagios服务器会调用客户端的nrpe命令
vi /usr/local/nagios/etc/nrpe.cfg
command=/usr/local/nagios/libexec/check_users -w 5 -c 10
command=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command=/usr/local/nagios/libexec/check_procs -w 150 -c 200
command=/usr/local/nagios/libexec/check_swap -w 20% -c 10%
下面这条是自己添加
command[check_ping81]=/usr/local/nagios/libexec/check_ping -H 10.155.0.1 -w 100.0,20% -c 500.0,60%#
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p /dev/hda1
#command[命令名称]=命令定义
具体使用见帮助
# ls
binetcincludelibexecshare
# pwd
/usr/local/nagios
# libexec/check_ping -h
check_ping v1.4.15 (nagios-plugins 1.4.15)
Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>
Copyright (c) 2000-2007 Nagios Plugin Development Team
<nagiosplug-devel@lists.sourceforge.net>
Use ping to check connection statistics for a remote host.
Usage:
check_ping -H <host_address> -w <wrta>,<wpl>% -c <crta>,<cpl>%
[-p packets] [-t timeout] [-4|-6]
Options:
-h, --help
Print detailed help screen
-V, --version
Print version information
-4, --use-ipv4
Use IPv4 connection
-6, --use-ipv6
Use IPv6 connection
-H, --hostname=HOST
host to ping
-w, --warning=THRESHOLD
warning threshold pair
-c, --critical=THRESHOLD
critical threshold pair
-p, --packets=INTEGER
number of ICMP ECHO packets to send (Default: 5)
-L, --link
show HTML in the plugin output (obsoleted by urlize)
-t, --timeout=INTEGER
Seconds before connection times out (default: 10)
配置nrpe.cfg后，必须重启nrpe。重启方法（杀死进程，在重启），否则更改不会生效
# ps aux|grep nrpe
nagios 33270.00.0 4880 924 ? Ss Sep02 0:03 /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
root 222930.00.0 3908 648 pts/0 R+ 11:07 0:00 grep nrpe
# /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d
服务器端
测试与客户端连接，如下表示正常
# /usr/local/nagios/libexec/check_nrpe -H 10.155.2.81
NRPE v2.8b1
下面表示不正常，见问题与解决（2）
# /usr/local/nagios/libexec/check_nrpe -H 10.155.2.81
Connection refused by host
配置nagios.cfg，增加一条记录
# vi /usr/local/nagios/etc/nagios.cfg
cfg_file=/usr/local/nagios/etc/objects/mylinux.cfg
cfg_file=/usr/local/nagios/etc/objects/commands.cfg ;此前面已经设置过
配置nagios.cfg，增加一条记录
vi /usr/local/nagios/etc/objects/commands.cfg
#在后面增加追加如下内容
#check nrpe
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}
mylinux.cfg在目录中没有，需要自己添加
# touch/usr/local/nagios/etc/objects/mylinux.cfg
#---------------------------------------------此段定义主机--------------------------------------------------------
define host{
use linux-server
host_name 10.155.2.81-cacti
alias mylinux
address 10.155.2.81
}
#--------------------------------下面定义服务器，也就是监控项------------------------------------------
define service{
use generic-service
host_name 10.155.2.81-cacti
service_description Swap Usage
check_command check_nrpe!check_swap
}
define service{
use generic-service
host_name 10.155.2.81-cacti
service_description Current Load
check_command check_nrpe!check_load
}
define service{
use generic-service
host_name 10.155.2.81-cacti
service_description Partition Usage
check_command check_nrpe!check_hda1
}
define service{
use generic-service
host_name 10.155.2.81-cacti
service_description Current Users
check_command check_nrpe!check_users
}
define service{
use generic-service
host_name 10.155.2.81-cacti
service_description Total Processes
check_command check_nrpe!check_total_procs
}
define service{
use generic-service
host_name 10.155.2.81-cacti
service_description PING
check_command check_nrpe!check_ping81
}
重启nagios，ie浏览(图3)
配置交换机被监控机（客户端）
这里的switch.cfg是交换机的一个监控模板，我保留这个cfg，复制为switch31.cfg编辑
# vi /usr/local/nagios/etc/nagios.cfg
# Definitions for monitoring a router/switch
#cfg_file=/usr/local/nagios/etc/objects/switch.cfg
cfg_file=/usr/local/nagios/etc/objects/switch31.cfg
几乎不用改，把host name和address改了，最后一个mrtg我没用网络里没有注释掉了
# vi switch31.cfg
define host{
use generic-switch ; Inherit default values from a template
host_name g13a-dell5424-31 ; The name we're giving to this switch
alias Linksys SRW224P Switch; A longer name associated with the switch
address 10.155.0.31 ; IP address of the switch
hostgroups switches ; Host groups this switch is associated with
}
define hostgroup{
hostgroup_nameswitches ; The name of the hostgroup
alias Network Switches ; Long name of the group
}
define service{
use generic-service ; Inherit values from a template
host_name g13a-dell5424-31; The name of the host the service is associated with
service_description PING ; The service description
check_command check_ping!200.0,20%!600.0,60%; The command used to monitor the service
normal_check_interval 5 ; Check the service every 5 minutes under normal conditions
retry_check_interval 1 ; Re-check the service every minute until its final/hard state is determined
}
# Monitor uptime via SNMP
define service{
use generic-service ; Inherit values from a template
host_name g13a-dell5424-31
service_description Uptime
check_command check_snmp!-C chrswitch-o sysUpTime.0
}
# Monitor Port 1 status via SNMP
define service{
use generic-service ; Inherit values from a template
host_name g13a-dell5424-31
service_description Port 1 Link Status
check_command check_snmp!-C chrswitch -o ifOperStatus.1 -r 1 -m RFC1213-MIB
}
# Monitor bandwidth via MRTG logs
#define service{
# use generic-service ; Inherit values from a template
# host_name linksys-srw224p
# service_description Port 1 Bandwidth Usage
# check_command check_local_mrtgtraf!/var/lib/mrtg/192.168.1.253_1.log!AVG!1000000,1000000!5000000,5000000!10
# }
Switch就完成，红色见问题3(图4)
配置windows被监控机（客户端）
Windows监控需要在windows安装一个插件nsclient++，http://nsclient.org/nscp/downloads
下载后解压到c盘
C:/NSClient>nsclient++ /install
Service NSClientpp installed...
l NSClient++.cpp(227) Service installed!
用记事本编辑nsc.ini，去掉注释符号”;”除了CheckWMI.dll和RemoteConfiguration.dll
FileLogger.dll
CheckSystem.dll
CheckDisk.dll
NSClientListener.dll
NRPEListener.dll
SysTray.dll
CheckEventLog.dll
CheckHelpers.dll
;CheckWMI.dll
CheckExternalScripts.dll
NSCAAgent.dll
LUAScript.dll
;RemoteConfiguration.dll
NRPEClient.dll
CheckTaskSched.dll
allowed_hosts=10.155.2.65/32
port=12489
C:/NSClient>NSClient++ -start
Starting NSClientpp
C:/NSClient>netstat -an | more
Active Connections
ProtoLocal Address Foreign Address State
TCP 0.0.0.0:5666 0.0.0.0:0 LISTENING
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
服务器
# vi /usr/local/nagios/etc/nagios.cfg
# Definitions for monitoring a Windows machine
cfg_file=/usr/local/nagios/etc/objects/windows.cfg
# vi /usr/local/nagios/etc/objects/windows.cfg
windows.cfg没有什么可改的，只是把hostname和ip改了就行了(图5)
邮件监控
邮件监控可以配置sendmail，我对sendmail一窍不通，这里还是用mail命令完成。首先是编辑nagios.cfg，以前已经设置了，这里看看就行了
# vi /usr/local/nagios/etc/nagios.cfg
cfg_file=/usr/local/nagios/etc/objects/contacts.cfg
这里要注意的是如果在这设置间隔和期限等是在整个nagios生效的，所有的客户端都是按照这个配置，如果想单独设置在各个cfg中单独配置，一会会讲。整个cfg内容没什么说的了，contact_name和email，还有就是contactgroup_name在所有的地方都是设置这个名字，不要写错，member可以设置多个用”,”隔开，
# vi contacts.cfg
define contact{
contact_name user1
alias Nagios Admin
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r
host_notification_options d,r
service_notification_commands notify-by-email
host_notification_commands host-notify-by-email
email xxxx@163.com
pager 13800138000
}
define contactgroup{
contactgroup_name admins
alias Nagios Administrators
members user1
}
notify-by-email和host-notify-by-email在command.cfg中定义了（见问题5）
这个就是在服务中单独设置，就不多讲了
define service{
use generic-service ; Name of service template to use
host_name test_nrpe
service_description apache
is_volatile 0 #类似声音警告功能关闭
check_period 24x7 #监控期限为24X7
max_check_attempts 1 #最大重试次数
normal_check_interval 1 #标准检测时间间隔 1分钟
retry_check_interval 1 #重试时间间隔
contact_groups admins #联系组
notification_options w,u,c,r # w,u,c,r 发生这四种情况时，进行通告。
notification_interval 960 # 通告间隔
notification_period 24x7 #通告过期时间
check_command check_http!100.0,20%!500.0,60%
}
参数说明
服务出了状况通知的时间段，这个时间段是前面 timeperiods.cfg 里面定义的。
service_notification_period 24x7
主机出现状况时通知的时间段，这个时间段是前面 timeperiods.cfg 里面定义的。
host_notification_period 24x7
当服务出现 w— 报警 (warning),u— 未知 (unkown),c— 严重 (critical),r— 从异常恢复到正常，在这四种情况下通知联系人
service_notification_options w,u,c,r
当主机出现 d­­­­— 当机 (down),u— 返回不可达 (unreachable),r— 从异常情况恢复正常 , 在这 3 种情况下通知联系人
host_notification_options d,u,r
服务出问题通知采用的命令 notify-service-by-email , 这个命令是在 commands.cfg 中定义的 , 作用是给联系人发邮件 . 在 nagios2.x 的版本上可以不一样，可以自己到 commands.cfg 里看一下；在这里也可以设置发送短信的方式通知联系人，前提是你要配置有发送知道的脚本，还要到 commands.cfg 里面添加发送脚本所用到的命令；
service_notification_commandsnotify-service-by-email
同上 , 主机出问题时采用的也是发邮件的方式通知联系人
host_notification_commands notify-host-by-email
指定 联系的人 email 地址
email yaozhan189@163.com
联系人的手机 , 前提是要支持短信通知，这里没有启用通过手机短信的方式发送警报 pager 13800138000
问题和解决
1、
# /usr/local/nagios/libexec/check_nrpe -H localhost
Connection refused by host
如果在本机上都出下如下结果，说明nrpe没有启动，用启动命令启动
2、
# /usr/local/nagios/libexec/check_nrpe -H 10.155.2.81
Connection refused by host
可能是客户端nrpe.cfg，没有加服务器ip地址allowed_hosts=127.0.0.1,10.155.2.6
可能是客户端的防火墙
3、是因为nagios服务器中没有check_snmp命令，有安装nagios之前没有安装net-snmp和net-snmp-utils组件。网上有人提示安装组件后在重新安装nagios-plugins-1.4.15，我没有成功。(图6)
# libexec/check_snmp -h
-bash: libexec/check_snmp: No such file or directory
4网上有文章提示安装nagios之前，系统需要安装如下。
yum -y install gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5 krb5-devel libidn libidn-devel openssl openssl-devel openldap openldap-devel nss_ldap openldap-clients openldap-servers perl gd gd-devel jpeg jpeg-devel libpng libpng-devel Net-snmp zlib freetype libart_lgpl cairo-devel pango-devel lrzsz*
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