Installing Nagios 4.0.2 On CentOS 6.5 (Including NRPE installation)

珀耳塞福建

Installing Nagios 4.0.2 On CentOS 6.5 x86_64

Introduction
　　Nagios is a monitoring tool under GPL licence. This tool lets you  monitor servers, network hardware (switches, routers, ...) and  applications. A lot of plugins are available and its big community makes  Nagios the biggest open source monitoring tool. This tutorial shows how  to install Nagios 4.0.2 on CentOS 6.5.
　　

　　Note: you should config postfix mail running correctly first.
　　please setup NTP for time synchronization
Prerequisites
　　Make sure you've set the hostname correctly, otherwise to modify /etc/sysconfig/network file.

　　After installing your CentOS server, you have to disable selinux & install some packages to make nagios work.
　　To disable selinux, open the file: /etc/selinux/config
# vi /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=permissive // change this value to disabled
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted 　　Now, download all packages you need:
# yum -y install gd gd-devel httpd php gcc glibc glibc-common make net-snmp net-snmp-devel net-snmp-utils openssl-devel mysql-devel (使用check_mysql所需) openssh-clients (使用check_by_ssh所需)

　　
[root@tecmint]# groupadd nagios
　　useradd -s /bin/false -g nagios nagios
　　

　　Next, add apache user to the nagios group.
[root@tecmint]# usermod -G nagios apache

Nagios Installation
　　Create a directory:
# mkdir /root/nagios
　　Navigate to this directory:
# cd /root/nagios
　　Download nagios-core & plugin:
# wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.2.tar.gz.
# wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.5.tar.gz
　　Untar nagios core:
# tar xvzf nagios-4.0.2.tar.gz
　　Go to the nagios dir:
# cd nagios
　　Configure before make:
# ./configure --with-command-group=nagios --enable-nanosleep --enable-event-broker

　　Make all necessary files for Nagios:
# make all
　　Installation:
# make install
# make install-init
# make install-commandmode
# make install-config
Open the “contacts.cfg” file with your choice of editor and set the  email address  associated with the nagiosadmin contact definition to receiving email alerts.
# vi /usr/local/nagios/etc/objects/contacts.cfg

# make install-webconf
　　Create a password to log into the web interface:
# htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
chown nagios.nagios /usr/local/nagios/etc/htpasswd.users
Note: more users can be added with htpasswd /usr/local/nagios/etc/htpasswd.users username, this username should be matched with contacts in the contacts.cfg
　　

　　Now, you have to install the plugins:
# cd ..
# tar xvzf nagios-plugins-1.5.tar.gz
# cd nagios-plugins-1.5
# ./configure --with-nagios-user=nagios --with-nagios-group=nagios
# make
# make install
　　

　　Verify Nagios Configuration Files
　　/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
　　

　　Start the service and start it on boot:
# chkconfig --add nagios
# chkconfig --level 35 nagios on
# chkconfig --level 35 httpd on


vi /etc/hosts to add ip_address and hostname

vi /etc/httpd/conf/httpd.conf to modify "ServerName"
touch /var/www/html/index.html to avoid get localhost HTTP error “Nagios HTTP WARNING: HTTP/1.1 403 Forbidden”
# service nagios start
# service httpd start


　　Now, connect to your nagios system:
　　http://Your-Nagios-IP/nagios and enter login : nagiosadmin & password you have chosen above.
　　

And after the installation ?
　　After  the installation you have to configure all your host & services in  nagios configuration files.This step is performed in command line and is  complicated, so I recommand to install tool like Centreon, that is a  beautiful front-end to add you host & services.
　　

　　Install NRPE:
On Remote Linux Host:
1. yum -y install gcc glibc glibc-common gd gd-devel make net-snmp net-snmp-devel net-snmp-utils openssl-devel mysql-devel (使用check_mysql所需)

　　
2. groupadd nagios
　　useradd -s /bin/false -g nagios nagios
　　
3. mkdir /root/nagios
　　cd /root/nagios
　　wget https://www.nagios-plugins.org/download/nagios-plugins-1.5.tar.gz

　　tar xvf nagios-plugins-1.5.tar.gz
　　
4. cd nagios-plugins-1.5
　　./configure
　　make; make install
　　chown nagios.nagios /usr/local/nagios
　　chown -R nagios.nagios /usr/local/nagios
　　
5. cd /root/nagios
　　wget http://garr.dl.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz

　　tar xzf nrpe-2.15.tar.gz
　　
6. cd nrpe-2.15
　　./configure
　　make all
　　make install-plugin
　　make install-daemon
　　make install-daemon-config
　　
7. vi /usr/local/nagios/etc/nrpe.cfg add monitoring server ip to "allowed_hosts=127.0.0.1,monitoring_ip_address" line
　　所有需要检测本地资源的命令都写在此文件中 -- nrpe.cfg

　　
8. cp /root/nagios/nrpe-2.15/init-script /etc/init.d/nrpe
　　chmod 755 /etc/init.d/nrpe
　　chkconfig --add nrpe
　　service nrpe start
　　
9. check nrpe version: /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
　　
10. configure firewall rules

　　iptables -A INPUT -p tcp -m tcp --dport 5666 -j ACCEPT
　　service iptables save
On Monitoring Host:
1. cd /root/nagios
　　wget http://garr.dl.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz

　　tar xzf nrpe-2.15.tar.gz
　　
2. cd nrpe-2.15
　　./configure
　　make all
　　make install-plugin
　　
3. check remote host nrpe version:
　　/usr/local/nagios/libexec/check_nrpe -H remote_ip_address
　　
4. create check_nrpe command:
vi /usr/local/nagios/etc/objects/commands.cfg
define command{
    command_name    check_nrpe
    command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
    }
　　
5. cd /usr/local/nagios/etc/objects/

　　touch hosts.cfg services.cfg
　　chown nagios.nagios hosts.cfg services.cfg
　　chmod 664 hosts.cfg services.cfg
　　
6. vi /usr/local/nagios/etc/nagios.cfg
add

　　"cfg_file=/usr/local/nagios/etc/objects/hosts.cfg'
　　"cfg_file=/usr/local/nagios/etc/objects/services.cfg'
　　
7. service nagios restart
For Windows client using NSClient++ x64
　　1. install NSCP-0.4.1.102-x64.msi on Windows Server 2012

　　

　　2. on nagios monitoring server
　　vi /usr/local/nagios/etc/objects/windows.cfg
　　根据需要修改windows主机的名称及IP address
　　

　　3. vi /usr/local/nagios/etc/nagios.cfg
　　cfg_file=/usr/local/nagios/etc/objects/windows.cfg
　　

　　4. /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
　　service nagios restart
　　

　　Nagstamon桌面报警器
　　1. 从 http://nagstamon.ifw-dresden.de/  下载最新的版本，我这里下载的是windows版--Nagstamon_0.9.11_setup.exe

　　

　　2. 安装完后配置下

　　

　　3. 显示效果