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配置被监控机
本文讲述的是：Redhat配置nagios。返回大纲。
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
[root@localhost ~]# useradd nagios [root@localhost ~]# 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
[root@localhost ~]# tar -zxvf nagios-plugins-1.4.15.tar.gz [root@localhost ~]# cd nagios-plugins-1.4.15 [root@localhost nagios-plugins-1.4.15]# ./configure --prefix=/usr/local/nagios [root@localhost nagios-plugins-1.4.15]# make [root@localhost nagios-plugins-1.4.15]# make install [root@localhost nagios-plugins-1.4.15]# chown nagios.nagios /usr/local/nagios [root@localhost nagios-plugins-1.4.15]# chown -R nagios.nagios /usr/local/nagios/libexec
安装nrpe
[root@localhost ~]# tar -zxvf nrpe-2.8b1 [root@localhost ~]# cd nrpe-2.8b1 [root@localhost nrpe-2.8b1]# ./configure [root@localhost nrpe-2.8b1]# make all [root@localhost nrpe-2.8b1]# make install-plugin [root@localhost nrpe-2.8b1]# make install-daemon [root@localhost nrpe-2.8b1]# make install-daemon-config
编辑nrpe.cfg
[root@localhost ~]# 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
[root@localhost etc]# /usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.8b1
[root@localhost etc]# 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***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[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10 command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20 command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200 command[check_swap]=/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
[root@localhost nagios]# ls bin etc include libexec share [root@localhost nagios]# pwd /usr/local/nagios [root@localhost nagios]# libexec/check_ping -h check_ping v1.4.15 (nagios-plugins 1.4.15) Copyright (c) 1999 Ethan Galstad Copyright (c) 2000-2007 Nagios Plugin Development Team Use ping to check connection statistics for a remote host.
Usage: check_ping -H -w ,% -c ,% [-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
[root@localhost ~]# ps aux|grep nrpe nagios 3327 0.0 0.0 4880 924 ? Ss Sep02 0:03 /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d root 22293 0.0 0.0 3908 648 pts/0 R+ 11:07 0:00 grep nrpe [root@localhost ~]# /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
[root@localhost nrpe-2.8b1]# /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)
[root@localhost nrpe-2.8b1]# /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
[root@localhost ~]# 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 nrpedefine command{command_name check_nrpecommand_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$}mylinux.cfg在目录中没有，需要自己添加
[root@localhost ~]# 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)
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