监控工具-Nagios-Nagios安装配置nrpe
参考链接1
参考文件：
远程被监控主机安装配置
- 用户设置
As of NRPE version 3.0, the Makefile includes targets to add the required users and groups to the computer's local accounts (usually /etc/passwd), if necessary. If you will be adding them to LDAP or some other authentication system, you will have to do it yourself.
- 安装Nagios Plugin
mkdir ~/downloads
cd ~/downloads
wget http://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar xzf nagios-plugins-2.2.1.tar.gz
cd nagios-plugins-2.2.1
./configure
make
make install
根据版本不同，有可能需要手工调整目录权限
useradd nagios
groupadd nagios
usermod -a -G nagios nagios
chown nagios.nagios /usr/local/nagios
chown -R nagios.nagios /usr/local/nagios/libexec
- 安装xinetd
yum install xinetd
或从光盘Package目录下找到包rpm安装
- 安装NRPE Deamon
下载
cd ~/downloads
wget https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-3.2.1/nrpe-3.2.1.tar.gz
tar xzf nrpe-3.2.1.tar.gz
cd nrpe-nrpe-3.2.1
编译
./configure
make all
如果没有手工创建组和用户
make install-groups-users
安装nrpe插件，守护进程，实例配置文件
make install
make install-config
If you want NRPE to run per-connection under inetd, xinetd, launchd, systemd, smf, etc. run the following command:
make install-inetd
Make sure nrpe 5666/tcp is in your /etc/services file, if applicable.If you want to run NRPE all the time under init, launchd, systemd, smf, etc. run the followning command:
make install-init
守护进程的控制命令
service xinetd restart
systemctl reload xinetd # systemd
systemctl enable nrpe && systemctl start nrpe # systemd
- 测试nrpe本地服务情况
添加nrpe到/etc/services
echo "nrpe 5666/tcp" >> /etc/services
确认nrpe在运行
netstat -at | egrep "nrpe|5666"
如果失败，检查以下几项：
• You added the nrpe entry to your /etc/services file
• The only_from directive in the /etc/xinetd.d/nrpe file contains an entry for "127.0.0.1"
• xinetd is installed and started
• The appropriate line in /etc/inetd.conf has been uncommented
• Check the system log files for references about xinetd or nrpe and fix any problems that are reported
检查nrpe是否正确的运行
/usr/local/nagios/libexec/check_nrpe -H localhost
以上检查正确的提示示例： [图片上传失败...(image-25155d-1534665580804)]
最后，以上都没问题：
add the hostname or IP address of the nagios server to the /etc/xinetd.d/nrpe file, or /etc/hosts-allow and hosts-deny.
- 放开防火墙规则
iptables类型
# iptables -I RH-Firewall-1-INPUT -p tcp -m tcp –dport 5666 -j ACCEPT
# service iptables save
- 定义npre命令
可以通过修改/usr/local/nagios/etc/nrpe.cfg，编辑命令的定义，增加新的命令。
若按本文档安装，可以有一下命令供测试：
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_users
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_load
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_hda1
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_total_procs
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_zombie_procs
done on the remote host
服务端安装配置
假定服务端nagios已经安装完毕，还需要做以下几件事儿：
- 安装check_nrpe插件
- 为check_nrpe 创建命令定义
- 为监控的远程主机创建主机（host）和服务（service）定义
- 安装nrpe
cd ~/downloads
wget https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-3.2.1/nrpe-3.2.1.tar.gz
tar xzf nrpe-3.2.1.tar.gz
cd nrpe-nrpe-3.2.1
./configure
make check_nrpe
make install-plugin
- 测试与远程nrpe daemon的通信
替换ip执行
/usr/local/nagios/libexec/check_nrpe -H 192.168.0.1
NRPE v3.2.1
If the plugin returns a timeout error, check the following:
• Make sure there isn't a firewall between the remote host and the monitoring server that is blocking communication
• Make sure that the NRPE daemon is installed properly and running on the remote host
• Make sure the remote host doesn't have local firewall rules that prevent the monitoring server from talking to the NRPE daemon
如果报以下错误:
[图片上传失败...(image-ac0032-1534665580804)]
参考如下链接修改：
Edit: /usr/local/nagios/etc/nrpe.cfg
line 98: allowed_hosts=x.x.x.x #添加服务端ip
systemctl restart nrpe.service && systemctl restart xinetd.service
再次测试：
[图片上传失败...(image-82c752-1534665580804)]
- 创建命令定义
通常是nagios/etc/objects/commands.cfg 中添加
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}
- 创建主机或服务定义
先添加模板，通常是nagios/etc/objects/templates.cfg 中添加
define host{
name linux-box ; Name of this template
use generic-host ; Inherit default values
check_period 24x7
check_interval 5
retry_interval 1
max_check_attempts 10
check_command check-host-alive
notification_period 24x7
notification_interval 30
notification_options d,r
contact_groups admins
register 0 ; DONT REGISTER THIS - ITS A TEMPLATE
}
定义一个使用该模板的主机：
define host{
use linux-box ; Inherit default values from a template
host_name remotehost ; The name we're giving to this server
alias centos7 ; A longer name for the server
address 172.16.2.240 ; IP address of the server
}
定义一些服务监控远程主机
define service{
use generic-service
host_name remotehost
service_description CPU Load
check_command check_nrpe!check_load
}
define service{
use generic-service
host_name remotehost
service_description Current Users
check_command check_nrpe!check_users
}
define service{
use generic-service
host_name remotehost
service_description /dev/hda1 Free Space
check_command check_nrpe!check_hda1
}
define service{
use generic-service
host_name remotehost
service_description Total Processes
check_command check_nrpe!check_total_procs
}
define service{
use generic-service
host_name remotehost
service_description Total Processes
check_command check_nrpe!check_total_procs
}
- 重启nagios
检查配置文件是否正确：
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
systemctl restart nagios
web接口查看，需要等几分钟才会有内容，开始只有
[图片上传失败...(image-b3f748-1534665580802)]
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