[Monitoring] Cài đặt Nagios trên CentOS7

[root@svr-alert ~]#yum update -y && yum groupinstall "Development Tools" -y
[root@svr-alert ~]#yum install vim wget net-tools -y
[root@svr-alert ~]#vim /etc/sysconfig/selinux => Disabled
[root@svr-alert ~]# systemctl stop firewalld
[root@svr-alert ~]#systemctl disable firewalld

[1] Cài package:

[root@svr-alert ~]#yum install perl wget httpd php gcc glibc glibc-common gd gd-devel
[root@svr-alert ~]#yum install openssl-devel xinetd make net-snmp libpng-devel libjpeg-turbo-devel

[2]Tạo user:

[root@svr-alert ~]# useradd -m nagios
[root@svr-alert ~]# passwd nagios (nagios)
[root@svr-alert ~]# groupadd nagcmd
[root@svr-alert ~]# usermod -a -G nagcmd nagios && usermod -a -G nagcmd apache

[3]Cài đặt Nagios Core:

[root@svr-alert ~]# wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.3.4.tar.gz
[root@svr-alert ~]# tar -zxvf nagios-4.3.4.tar.gz
[root@svr-alert ~]# cd nagios-4.3.4
[root@svr-alert nagios-4.3.4]#./configure –-with-command-group=nagcmd
[root@svr-alert nagios-4.3.4]#make all
[root@svr-alert nagios-4.3.2]#make install
[root@svr-alert nagios-4.3.4]#make install-init
[root@svr-alert nagios-4.3.4]#make install-config
[root@svr-alert nagios-4.3.4]#make install-commandmode
[root@svr-alert nagios-4.3.4]#make install-webconf

Đặt password login Nagios web:

[root@svr-alert nagios-4.3.4]#htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin (nagiosa123)
[root@svr-alert nagios-4.3.4]#systemctl restart httpd

[4]Cài đặt Nagios plugin:

[root@svr-alert ~]# wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
[root@svr-alert ~]# tar xzvf nagios-plugins-2.2.1.tar.gz
[root@svr-alert ~]# cd nagios-plugins-2.2.1
[root@svr-alert nagios-plugins-2.2.1]#yum install bind-utils net-snmp net-snmp-devel net-snmp-utils net-snmp-perl perl-Net-SNMP
[root@svr-alert nagios-plugins-2.2.1]#./configure --with-nagios-user=nagios --with-nagios-group=nagios
[root@svr-alert nagios-plugins-2.2.1]#make && make install

[5]Cài NRPE (more):
Trong trường hợp bạn có dùng check_nrpe thì cài như sau:

[root@svr-alert ~]# tar -zxvf nrpe-3.2.0.tar.gz
[root@svr-alert ~]# cd nrpe-3.2.0
[root@svr-alert nrpe-3.2.0]#./configure
[root@svr-alert nrpe-3.2.0]#make all
[root@svr-alert nrpe-3.2.0]#make install-plugin

• Add check_nrpe trong command.cfg

[root@svr-alert ~]#vim /usr/local/nagios/etc/objects/commands.cfg

• #Add command end file:

define command{
 command_name check_nrpe
 command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
 }

• Test “check_nrpe”:

#/usr/local/nagios/libexec/check_nrpe -H IP_remote => Output: NRPE v.xxx => OK

[6]Khởi start dịch vụ:

[root@svr-alert ~]# systemctl restart httpd
[root@svr-alert ~]# systemctl enable httpd
[root@svr-alert ~]# chkconfig --add nagios
[root@svr-alert ~]# chkconfig --level 35 nagios on

• Kểm tra config

[root@svr-alert ~]# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
[root@svr-alert ~]# systemctl start nagios